ORCID Profile
0000-0001-7959-0717
Current Organisations
University of Wollongong
,
Central South University
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Publisher: Elsevier BV
Date: 05-2019
Publisher: Springer Science and Business Media LLC
Date: 06-2016
Publisher: Wiley
Date: 02-06-2021
Abstract: During the COVID‐19 lockdown, parents and caregivers were asked to take greater responsibility for their children's education while they were unable to attend school. In this commentary, we report on data sourced from 243 participants in the Tasmania Project in Australia about their experiences of learning from home during COVID‐19 lockdown. We engage with ideas about boundaries and bounding processes to understand how participants perceived challenges to their children's learning from home. They identified a lack of physical space for children's work to be performed and a lack of time, skill, and confidence to support them. We explore the bounding processes inherent to understanding and constituting education through identity, space, and place making and consider the ways in which these processes were revealed in the challenges identified by respondents. We argue that home learning disrupted known practices associated with education and schooling and challenged accepted categories and socio‐spatial isions created by institutionalisation. We anticipate that exploring the challenges of home learning during COVID‐19 from the perspectives of parents and caregivers will inform future home–school partnerships.
Publisher: Elsevier BV
Date: 2022
Publisher: Informa UK Limited
Date: 25-05-2019
Publisher: Trans Tech Publications, Ltd.
Date: 2012
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.706-709.1580
Abstract: Blades are key part of hydro turbines, which often distorts during heat treatment process for their special structures. In this paper, thermal fluid finite element simulation of the forced air cooling process of a blade casting was carried out under a variety of distances between fans and blades, air speeds, groups of fans and circumstance temperatures. The temperature fields of blade castings were obtained. A novel parameter, temperature difference between surfaces of castings along thickness direction, was proposed to analyze the distortion of blade castings. The distortion behavior of blade castings with martensitic stainless steel were discussed, which is in good agreement with distortion regularity of the experimental ones. The temperature differences between blade casting surfaces are always greater than zero, resulting in distortion which could be ided into three stages. Finally, we focused on discussing the control methods of distortion behavior of blade castings which could be operated in actual production.
Publisher: Elsevier BV
Date: 04-2019
Publisher: Springer Science and Business Media LLC
Date: 06-02-2023
Publisher: ASME International
Date: 02-2008
DOI: 10.1115/1.2783256
Abstract: The present work introduces a new type of numerical analyzing method: the contact element method with two relative coordinates (CEM). The main characteristic of the procedure is elements meshing on the basis of the contact length between objects and that each element has two relative coordinates. The ordinary expression of this procedure is DX[CXY(i)]=DY[CYX(i)]. Through this method, the CEM function of the 20-high Sendzimir mill and the deflection function expression of every roll are obtained. A computational software SM4SM for the Sendzimir mill has been developed, by which the deflection condition of rolls S, O, I, and A can be obviously seen. The results obtained by CEM have also been compared to that by the finite element method.
Publisher: Elsevier BV
Date: 2009
Publisher: Springer Science and Business Media LLC
Date: 16-01-2019
Publisher: Springer Science and Business Media LLC
Date: 21-12-2012
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 10-2023
Publisher: MDPI AG
Date: 19-11-2021
DOI: 10.3390/MET11111862
Abstract: Incremental Sheet Forming (ISF) is emerging as one of the popular dieless forming processes for the small-sized batch production of sheet metal components. However, the parts formed by the ISF process suffer from poor surface finish, geometric inaccuracy, and non-uniform thinning, which leads to poor part characteristics. Hammering, on the other hand, plays an important role in relieving residual stresses, and thus enhances the material properties through a change in grain structure. A few studies based on shot peening, one of the types of hammering operation, revealed that shot peening can produce nanostructure surfaces with different characteristics. This paper introduces a novel process, named the Incremental Sheet Hammering (ISH) process, i.e., integration of incremental sheet forming (ISF) process and hammering to improve the efficacy of the ISF process. Controlled hammering in the ISF process causes an alternating motion at the tool-sheet interface in the local deformation zone. This motion leads to enhanced material flow and subsequent improvement in the surface finish. Typical toolpath strategies are incorporated to impart the tool movement. The mechanics of the process is further explored through explicit-dynamic numerical models and experimental investigations on 1 mm thick AA1050 sheets. The varying wall angle truncated cone (VWATC) and constant wall angle truncated cone (CWATC) test geometries are identified to compare the ISF and ISH processes. The results indicate that the formability is improved in terms of wall angle, forming depth and forming limits. Further, ISF and ISH processes are compared based on the numerical and experimental results. The indicative statistical analysis is performed which shows that the ISH process would lead to an overall 10.99% improvement in the quality of the parts primarily in the surface finish and forming forces.
Publisher: Elsevier BV
Date: 05-2022
Publisher: ASME International
Date: 28-07-2022
DOI: 10.1115/1.4054991
Abstract: Continuous efforts are being made to improve the technology and the process involved in part production to meet the demands of society. Advancements in machining, as well as incremental forming, resulted in the generation of a technology that is capable of manufacturing monolithic components in a single setup. Such hybrid technological development, called deformation machining (DM), has the milling process contributing to thin structure generation and single point incremental forming (SPIF) leading to the desired geometrical deformation. Machining a material block to produce thin structure results in unwanted residual stresses in the workpiece, which hinders the part’s formability during SPIF. In the current research, stress-relieve annealing of aluminum alloy (Al 6061) is done to compensate for these residual stresses. While doing so, the optimum temperature of reheating is identified, at which the strength of the selected material is not significantly compromised. For this, preliminary microstructural investigations are carried out on the machined components at different temperatures, followed by experimental investigations. The force measurement of different s les was done during the experiments for determining the effects of heat treatment. Geometrical observations suggest that heat treatment results in better forming depth and improved forming angle, however, an increase in surface roughness is observed on the heat-treated parts.
Publisher: Trans Tech Publications, Ltd.
Date: 06-2010
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.654-656.1335
Abstract: Hydraulic turbine band castings are susceptible to deformation in heat treatment process if their cooling is not well controlled. The coupled analysis of forced air flow and heat transfer in normalizing process of a heavy turbine band runner casting with outer diameter of 8000 mm was carried out by using ANSYS software. The band undergoes significant deformation because of uneven cooling resulted by uneven air flow around it during normalizing. The forced air flow pattern is a key factor which influences the cooling uniformity and efficiency. It is optimized by adjusting the cooling fans’ orientation relative to the casting to form cyclone around it. Consequently, cooling uniformity is improved to avoid deformation.
Publisher: MDPI AG
Date: 18-03-2020
DOI: 10.3390/MET10030390
Abstract: This study proposes an electromagnetic-assisted st ing (EMAS) method with magnetic-force loading at the sheet end in order to control the springback phenomenon. The new method does not change the structure of the mold and does not generate a magnetic force at the sheet corner compared to traditional EMAS. Thus, the new approach could greatly extend the mold lifespan and could be readily adopted in commercial production environments. The effects of technological parameters, such as the distance between the blank holder and die, discharge voltage, and sheet thickness on the springback phenomenon were analyzed. Our results suggest that tangential stress and elastic strain energy both decrease with the increase of discharge voltage. The simulation method accurately predicted the deformation of the sheet during the quasi-static st ing and dynamic magnetic forming processes. The simulation and experimental results both show that as the discharge voltage increases, the bent angle after springback decreases.
Publisher: Elsevier BV
Date: 02-2023
Publisher: MDPI AG
Date: 22-05-2021
DOI: 10.3390/MET11060853
Abstract: The mechanical properties and microstructure evolution of an Al-Cu-Li alloy sheet processed via hot rolling (HR) (at 400 °C and 500 °C) or cryorolling (CR) (at −100 °C and −190 °C) and subsequence aging at 160 °C for 10 h were investigated. Before aging, the highest ultimate tensile strength of 502 MPa was achieved when the sheets were cryorolled at −190 °C, while the better ultimate tensile strength of 476 MPa and the best elongation rate of 11.1% was achieved simultaneously when the sheets were cryorolled at −100 °C. The refined grains and numerous uniform deformation-induced dislocations microstructures were responsible for the improved strength and enhanced ductility of the cryorolled sheets compared to that of the alloy processed by hot rolling with a low dislocation density zone (LDDZ) and high dislocation density zone (HDDZ). After aging at 160 °C for 10 h, the ultimate tensile strength further improved resulted from the greater precipitation strengthening, and the increased precipitates provided greater resistance to dislocations movement resulting in the increased ductility although the dislocation density decreased. The uniform dislocation microstructures in the cryorolled sheets provide numerous nucleation sites for the precipitates, leading to higher strength after aging.
Publisher: Informa UK Limited
Date: 05-03-2018
Publisher: Wiley
Date: 06-06-2013
Publisher: American Scientific Publishers
Date: 10-2012
Publisher: Elsevier BV
Date: 11-2021
Publisher: MDPI AG
Date: 30-01-2023
DOI: 10.3390/MA16031186
Abstract: Non-ferrous metallic materials are considered to be fundamental materials for manufacturing in-dustries, i [...]
Publisher: Wiley
Date: 23-03-2021
Abstract: Weight reduction is a major trend in the development of automotive, marine, and aerospace industry. Al alloys are the ideal choice for the lightweight design because of their superior mechanical properties and small mass density. In recent years, research results have demonstrated that plastic processing at cryogenic temperature can improve the mechanical properties of Al alloys. Herein, the mechanical properties of Al alloys at cryogenic environment as well as at room temperature are compared, and then the main progress is introduced in the development of fabrication of high‐performance Al alloys using cryo‐forming methods, such as cryorolling, asymmetric cryorolling, cryo‐extrusion, and cryo‐forging, with subsequent heat treatment. The grain refinement mechanism and the strengthening mechanism of Al alloys during various cryo‐forming processes are discussed. Finally, the potential development prospects of future researches in this field are proposed.
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 06-2017
Publisher: Springer Science and Business Media LLC
Date: 06-2006
Publisher: Informa UK Limited
Date: 07-2022
Publisher: Informa UK Limited
Date: 28-06-2022
Publisher: Trans Tech Publications, Ltd.
Date: 05-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.939.451
Abstract: Monolayer titanium carbide nitride (TiCN) and multilayer TiCN reinforced titanium (Ti) are coated on the surface of Ti6Al4V alloy by Filtered Arc Deposition System (FADS). Surface chemical composition has been characterized by an X-ray diffraction (XRD). Wear resistance of TiCN coating and TiCN/Ti coating have been detected by hommel tester T1000. Hardness and deformation mechanisms of the multilayer coatings are investigated using depth-sensing indentation comparison with the monolayer TiCN coatings. Focused Ion Beam (FIB) and Transmission Electron Microscopy (TEM) are used to identify the fracture modes of the coatings. The TEM image observations show that the inclined crack is the dominant crack in the monolayer TiCN coating while small bending crack is the dominant crack in the multilayer TiCN/Ti coating. The Ti layer with good ductility could efficiently suppress the crack propagation and absorb more indent energy.
Publisher: Springer Science and Business Media LLC
Date: 27-04-2023
Publisher: Inderscience Publishers
Date: 2009
Publisher: Springer Science and Business Media LLC
Date: 24-02-2023
Publisher: Springer Science and Business Media LLC
Date: 18-10-2023
Publisher: Springer Science and Business Media LLC
Date: 04-11-2014
Publisher: Elsevier BV
Date: 03-2009
Publisher: Elsevier BV
Date: 2014
Publisher: Iron and Steel Institute of Japan
Date: 2007
Publisher: Elsevier BV
Date: 04-2016
Publisher: AIP Publishing
Date: 17-04-2023
DOI: 10.1063/5.0142135
Abstract: High-entropy alloys exhibit great potential for cryogenic applications. This study investigates the nano-scratching behavior of CuCoCrFeNi high-entropy alloy at a cryogenic temperature (77 K) using molecular dynamics. Results show that compared with the single-grain model, the average friction coefficient (AFC) increases for all three polycrystalline models with different grain sizes d, but the anti-wear property can be improved by 28.5%, when grain size d = 10.7 nm. The smaller friction on the scratching surface of the single-grain model (AFC is 15.5% less than that of the model with d = 8.2 nm), which makes the overall temperature rise lower compared to that of the polycrystalline models. However, due to the stress concentration released when a complete stacking fault tetrahedron is produced, the single-grain model cannot significantly harden the surface and subsurface to a greater degree. In the polycrystalline models, dislocations are blocked at grain boundaries (GBs). However, the introduction of GBs changes the von Mises stress distribution. Finally, an attempt was made to reveal the role of yield pressure H3/E2 (H—hardness, E—elastic modulus) in friction-reducing and anti-wear properties.
Publisher: Informa UK Limited
Date: 02-11-2014
Publisher: Chinese Journal of Mechanical Engineering
Date: 2011
Publisher: Wiley
Date: 26-10-2016
Publisher: Elsevier BV
Date: 02-2015
Publisher: Springer Science and Business Media LLC
Date: 04-10-2023
Publisher: Elsevier BV
Date: 06-2013
Publisher: Informa UK Limited
Date: 05-2009
Publisher: Elsevier BV
Date: 11-2021
Publisher: SAGE Publications
Date: 29-05-2014
Abstract: The size effect on the mechanism of fracture in ultrafine grained sheets is an unsolved problem in microforming. This paper describes a tensile test carried out to study the fracture behavior and the shear fracture angles of both rolled and aged ultrafine grained aluminum 6061 sheets produced by asymmetric cryorolling. A scanning electron microscope was used to observe the fracture surface. The finite element method was used to simulate the tensile test using the uncoupled Cockcroft–Latham and Tresca criteria and the coupled Gurson–Tvergaard–Needleman damage criterion. It was found that the shear fracture angle decreases gradually from 90° to 64° with an increasing number of passes. The results of simulations using the Gurson–Tvergaard–Needleman criterion show trends similar to the experimental ones. The paper also presents a discussion on the fracture mechanism and the size effect during the tensile test.
Publisher: Elsevier BV
Date: 2017
Publisher: Springer Science and Business Media LLC
Date: 12-01-2012
Publisher: Wiley
Date: 20-09-2022
Abstract: The mechanical properties of high‐purity asymmetric rolled copper foils under cryogenic‐temperature and room‐temperature conditions are studied. The experimental results show that the ultimate tensile stress of the foils increases to a certain value (rolling reduction ratio ≈80%) and then decreases with a decrease in thickness when the tensile tests are carried out in the room‐temperature environment, which monotonically increases with the decrease in the foil thickness when the tensile tests are carried out in a cryogenic environment. The effect on the tensile strength of the copper foil is related to the intrinsic microstructural parameters, such as the dislocation density, grain boundary spacing, and dislocation source. The tensile test results at room and cryogenic temperatures reveal that the elongation decreases with an increase in the rolling reduction ratio. Interestingly, the copper foils of the tensile test at the cryogenic temperature exhibit better elongation than that at the room temperature.
Publisher: Springer Science and Business Media LLC
Date: 05-12-2023
Publisher: Wiley
Date: 06-12-2019
Publisher: Springer Science and Business Media LLC
Date: 28-04-2022
Publisher: Elsevier BV
Date: 07-2023
Publisher: Elsevier BV
Date: 11-2020
Publisher: Informa UK Limited
Date: 04-2014
Publisher: Springer Science and Business Media LLC
Date: 22-11-2022
Publisher: Elsevier BV
Date: 06-2017
Publisher: MDPI AG
Date: 02-01-2020
DOI: 10.3390/MET10010077
Abstract: Aluminum alloys can be used in the fabrication of intricate geometry and curved parts for a wide range of uses in aerospace and automotive sectors, where high stiffness and low weight are necessitated. This paper outlines a review of various research investigations on the superplastic behavior of aluminum alloys that have taken place mainly over the past two decades. The influencing factors on aluminum alloys superplasticity, such as initial grain size, deformation temperature, strain rate, microstructure refinement techniques, and addition of trace elements in aluminum alloys, are analyzed here. Since grain boundary sliding is one of the dominant features of aluminum alloys superplasticity, its deformation mechanism and the corresponding value of activation energy are included as a part of discussion. Dislocation motion, diffusion in grains, and near-grain boundary regions being major features of superplasticity, are discussed as important issues. Moreover, the paper also discusses the corresponding values of grain size exponent, stress exponent, solute drag creep and power law creep. Constitutive equations, which are essential for commercial applications and play a vital role in predicting and analyzing the superplastic behavior, are also reviewed here.
Publisher: Trans Tech Publications, Ltd.
Date: 11-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.773-774.166
Abstract: Refinement of the grain diameter of the micro structure of Aluminium foil with a thickness of 300μm has been done through the ARB process up to fourth cycles with 72 layers that are proven to increase formability in micro forming a cup. Grain size was measured from the full annealed condition, of the ARB process, and the results of ARB process followed by stress relieved. Formability of the formation of a cup which is expressed as the LDR has increased from 1.87 for the material conditions of full annealed to 2.00 for the ARB process followed by stress relieved in a single step process. In addition to improved formability obtained in a cup formation, grain refinement in the microstructure can also reduce cup earing and wrinkle on the cup wall.
Publisher: Elsevier BV
Date: 06-2007
Publisher: Springer Science and Business Media LLC
Date: 23-04-2014
Publisher: MDPI AG
Date: 04-04-2022
DOI: 10.3390/MET12040625
Abstract: Aluminum matrix composites (AMCs) reinforced by 1.5 and 3 wt% FeCoCrNi high-entropy alloy particles (HEAp) were obtained by a stir casting process. The AMCs strip was further prepared by room temperature rolling (RTR, 298 K) and cryorolling (CR, 77 K). The mechanical properties of the AMCs produced by RTR and CR were studied. The effect of a microstructure on mechanical properties of composites was analyzed by scanning electron microscopy (SEM). The results show that CR can greatly improve the mechanical properties of the HEAp/AMCs. Under 30% rolling reduction, the ultimate tensile strength (UTS) of the RTR 1.5 wt% HEAp/AMCs was 120.3 MPa, but it increased to 139.7 MPa in CR composites. Due to the volume shrinkage effect, the bonding ability of CR HEAp/AMCs reinforcement with Al matrix was stronger, exhibiting higher mechanical properties.
Publisher: Springer Science and Business Media LLC
Date: 18-05-2018
Publisher: Elsevier BV
Date: 08-2018
Publisher: Springer Science and Business Media LLC
Date: 27-08-2014
Publisher: Elsevier BV
Date: 2023
Publisher: Springer Science and Business Media LLC
Date: 04-2010
Publisher: Springer Science and Business Media LLC
Date: 05-09-2017
DOI: 10.1557/JMR.2017.355
Publisher: Springer Science and Business Media LLC
Date: 03-2006
Publisher: Elsevier BV
Date: 2023
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 02-2017
Publisher: Springer Science and Business Media LLC
Date: 23-05-2014
DOI: 10.1038/SREP05017
Publisher: MDPI AG
Date: 13-03-2022
DOI: 10.3390/MA15062119
Abstract: To explore the influence of annealing temperatures on the interfacial structure and peeling strength of Cu/Al clad sheets with a 304 stainless steel foil interlayer, an intermediate annealing treatment was performed at temperatures of 450 °C, 550 °C, and 600 °C, separately. The experimental results indicate that the interfacial atomic diffusion is significantly enhanced by increasing the intermediate annealing temperature. The average peeling strength of the clad sheets annealed at 550 °C can reach 34.3 N/mm and the crack propagation is along the steel/Cu interface, Cu-Al intermetallic compounds layer, and Al matrix. However, after high-temperature annealing treatment (600 °C), the liquid phase is formed at the bonding interface and the clear Cu/steel/Al interface is replaced by the chaotic composite interfaces. The clad sheet broke completely in the unduly thick intermetallic compounds layer, resulting in a sharp decrease in the interfacial bonding strength.
Publisher: Elsevier BV
Date: 08-2023
Publisher: Springer Science and Business Media LLC
Date: 30-12-2011
Publisher: Trans Tech Publications, Ltd.
Date: 06-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.264-265.439
Abstract: The elongation and the strength of rolled steel are severely affected by cracks in production. Reduction of cracks is important for the improvement of slab quality. In this paper, a series of experiments on internal crack healing in slab during rolling was carried out on the experimental rolling mill. The crack shape and the fracture morphology of the crack healing zones were observed by using the scanning electron microscope, and the shear strength of crack healing zone was tested through the tensile testing machine. With increase of the reduction ratio during rolling, the crack healing degree increases.
Publisher: Elsevier BV
Date: 2014
Publisher: Springer Science and Business Media LLC
Date: 08-2023
Publisher: Springer Science and Business Media LLC
Date: 05-10-2022
Publisher: Elsevier BV
Date: 04-2008
Publisher: MDPI AG
Date: 18-12-2020
Abstract: CoCrNi equiatomic medium entropy alloy sheets were prepared by asymmetric rolling, cryorolling, and asymmetric cryorolling. The asymmetric cryorolled s les exhibited a noteworthy ultra-fine-grain heterogeneous lamella structure. The microstructure and corresponding hardness obtained by different rolling processes and subsequent annealing are compared. It can be seen from the results that the cryogenic deformation temperature had a stronger effect on the mechanical properties of the medium entropy alloys (MEA), compared with the shear strain caused by the asymmetric cryorolling. The effect of annealing temperature on texture components and volume fractions of the specially rolled s les was also analyzed. The result revealed that the recrystallized MEA exhibited similar texture components and the corresponding volume fraction, which indicated that the rolling process had limited influence on the formation of annealing texture. The recrystallized texture after annealing retained the deformation texture and twin related orientations appeared. Asymmetric rolled MEA showed strong random composition than symmetric rolled MEA regardless of rolling temperature. The recrystallized textures of the species obtained by the three rolling processes did not exhibit a significant dependence on the annealing temperature.
Publisher: Elsevier BV
Date: 07-2017
Publisher: Springer Science and Business Media LLC
Date: 03-03-2016
DOI: 10.1557/JMR.2016.70
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 02-2006
Publisher: Springer Science and Business Media LLC
Date: 10-08-2021
Publisher: Elsevier BV
Date: 06-2023
Publisher: Elsevier BV
Date: 05-2009
Publisher: Springer Science and Business Media LLC
Date: 16-10-2013
Publisher: Elsevier BV
Date: 04-2023
Publisher: Informa UK Limited
Date: 30-05-2023
Publisher: Elsevier BV
Date: 09-2021
Publisher: Springer Science and Business Media LLC
Date: 24-07-2010
Publisher: Springer Science and Business Media LLC
Date: 25-10-2012
DOI: 10.1038/SREP00772
Publisher: Elsevier BV
Date: 11-2022
Publisher: Elsevier BV
Date: 12-2014
Publisher: Trans Tech Publications, Ltd.
Date: 10-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.148-149.103
Abstract: Deformation often appears in castings during casting and heat treatment processes, which determines the machining allowance setting and the machining size distribution of product. The paper presents a novel method for integrated simulation of the deformation behavior of castings during casting and heat treatment processes with a unified finite element model. Firstly, analyze the deformation of castings during casting process with the model containing mold and casting, and update the geometry of casting after casting process, then analyze the deformation of castings during heat treatment process and the final geometry shape of casting before machining could be obtained. By the method, investigation on the deformation behavior of a hydro turbine blade casting during casting and heat treatment processes was carried out, and the residual stress distribution and geometry shape of the casting were obtained.
Publisher: Trans Tech Publications, Ltd.
Date: 10-2011
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.148-149.1
Abstract: The updating geometric method was proposed to simulate the deformation behavior of workpiece during multipass shape rolling by using finite element method. Firstly, establish and solve the finite element model of the first pass shape rolling process, then update the geometric shape of workpiece after the first pass and delete rolls of the first pass, establish and mesh rolls of the second pass, modify the boundaries and material parameters of workpiece, and solve its deformation behavior during the second pass shape rolling. With the same steps, its deformation behavior during the following passes rolling could be solved. The method was applied to simulate the deformation behavior of a cube workpiece during six-pass H-beam rolling with split-rolling, and its shapes after every pass rolling process were obtained. Experiments on the deformation behavior of slab during multipass rolling were carried out by using pure lead in an experimental mill. The calculated results are in good agreement with the experimental ones.
Publisher: Elsevier BV
Date: 11-2016
Publisher: Springer Science and Business Media LLC
Date: 12-10-2014
Publisher: Elsevier BV
Date: 03-2017
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 12-2022
Publisher: Chinese Journal of Mechanical Engineering
Date: 2011
Publisher: Public Library of Science (PLoS)
Date: 09-09-2014
Publisher: Informa UK Limited
Date: 22-03-2010
Publisher: Springer Science and Business Media LLC
Date: 03-2023
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 11-2008
Publisher: AIP
Date: 2013
DOI: 10.1063/1.4806838
Publisher: MDPI AG
Date: 19-07-2021
DOI: 10.3390/MA14144025
Abstract: High-purity (99.999%) nickel with lamellar-structure grains (LG) was obtained by room-temperature rolling and cryorolling in this research, and then annealed at different temperatures (75 °C, 160 °C, and 245 °C). The microstructure was characterized by transmission electron microscopy. The grain growth mechanism during annealing of the LG materials obtained via different processes was studied. Results showed that the LG high-purity nickel obtained by room-temperature rolling had a static discontinuous recrystallization during annealing, whereas that obtained by cryorolling underwent static and continuous recrystallization during annealing, which was caused by the seriously inhibited dislocation recovery in the rolling process under cryogenic conditions, leading to more accumulated deformation energy storage in sheets.
Publisher: Elsevier BV
Date: 2018
Publisher: Elsevier BV
Date: 05-2023
Publisher: Elsevier BV
Date: 08-2008
Publisher: SAGE Publications
Date: 30-05-2013
Abstract: Temperature field has been widely used to predict the deformation of the blade castings during a heat treatment process. However, it is difficult to predict distortion of the castings. In this article, a new parameter, surface temperature difference of the castings along the thickness direction, has been proposed to analyze distortion of the thin-walled heavy castings with weak rigidity. The parameter was applied to the analysis of distortion of a heavy blade casting under various air speeds of the fans during heat treatment. The calculated minimum temperature in the blade casting was in good agreement with the actual measured value. The surface temperature differences result in the distortion process of the blade during the heat treatment process.
Publisher: Public Library of Science (PLoS)
Date: 08-07-2014
Publisher: Elsevier BV
Date: 09-2022
Publisher: Elsevier BV
Date: 12-2006
Publisher: Elsevier BV
Date: 11-2021
Publisher: Springer Science and Business Media LLC
Date: 03-2007
Publisher: Springer Science and Business Media LLC
Date: 28-06-2018
Publisher: Springer Science and Business Media LLC
Date: 05-2007
Publisher: Elsevier BV
Date: 11-2022
Publisher: Springer Science and Business Media LLC
Date: 06-08-2013
DOI: 10.1038/SREP02373
Publisher: Inderscience Publishers
Date: 2014
Publisher: Elsevier BV
Date: 12-2017
Publisher: Springer Science and Business Media LLC
Date: 21-05-2018
Publisher: Elsevier BV
Date: 04-2013
Publisher: Elsevier BV
Date: 02-2022
Publisher: Springer Science and Business Media LLC
Date: 08-04-2015
DOI: 10.1038/SREP09568
Abstract: It is well known that when coarse-grained metals undergo severe plastic deformation to be transformed into nano-grained metals, their ductility is reduced. However, there are no ductile fracture criteria developed based on grain refinement. In this paper, we propose a new relationship between ductile fracture and grain refinement during deformation, considering factors besides void nucleation and growth. Ultrafine-grained Al-Mg alloy sheets were fabricated using different rolling techniques at room and cryogenic temperatures. It is proposed for the first time that features of the microstructure near the fracture surface can be used to explain the ductile fracture post necking directly. We found that as grains are refined to a nano size which approaches the theoretical minimum achievable value, the material becomes brittle at the shear band zone. This may explain the tendency for ductile fracture in metals under plastic deformation.
Start Date: 2014
End Date: 2014
Funder: University of Wollongong
View Funded ActivityStart Date: 2013
End Date: 2015
Funder: Australian Research Council
View Funded ActivityStart Date: Start date not available
End Date: 2020
Funder: National Natural Science Foundation of China
View Funded ActivityStart Date: 2017
End Date: 2020
Funder: Australian Research Council
View Funded ActivityStart Date: 2012
End Date: 2014
Funder: National Natural Science Foundation of China
View Funded ActivityStart Date: 2011
End Date: 2013
Funder: National Natural Science Foundation of China
View Funded ActivityStart Date: 2013
End Date: 2013
Funder: University of Wollongong
View Funded ActivityStart Date: 2010
End Date: 2012
Funder: Ministry of Education of the People's Republic of China
View Funded ActivityStart Date: 2009
End Date: 2011
Funder: National Natural Science Foundation of China
View Funded ActivityStart Date: 2006
End Date: 2009
Funder: National Natural Science Foundation of China
View Funded ActivityStart Date: 2007
End Date: 2010
Funder: National Natural Science Foundation of China
View Funded Activity