ORCID Profile
0009-0004-1645-7109
Current Organisation
Cranfield University
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Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 03-2019
Publisher: Elsevier BV
Date: 05-2019
Publisher: Elsevier BV
Date: 04-2020
Publisher: Springer Science and Business Media LLC
Date: 13-08-2022
DOI: 10.1007/S00170-022-09859-W
Abstract: Defects would occur in the weld joint of the wheel rims during the post-flash butt welding (FBW) process suffering from poor plasticity, which will deteriorate the quality and lifecycle of finish products. Therefore, the FBW process of the 440CL high-strength-low-alloy (HSLA) steel was physically simulated and the influence of flash parameters on FBW joints was systematically evaluated in this study. The results showed that the width of heat affected zone increased with accumulated flash allowance (δ f ) while declined with accelerated flash speed (v f ). The recrystallization level would be intensified with increased δ f . Meanwhile, the acceleration in v f populated the WZ with a more homogeneous microstructure, higher recrystallization degree and lower dislocation density. The hardness in WZ slightly reduced (202 → 195 HV) as increased δ f but obviously dropped (192 → 177 HV) as increased v f . All tensile s les were fractured at the BM location and the tensile properties of FBW joints exhibit a good match with those of BM, with a slight increase in strength (UTS: 468 ~ 493 MPa YS: 370 ~ 403 MPa) but a mild decrease in plasticity (EL: 39 ~ 44% RA: 74 ~ 79%). Furthermore, both the joint strength and ductility showed a downward tendency with the increment of δ f . However, the strength slightly decreased while the ductility increased with the advancement of v f . These findings would be valuably referential to the real FBW of HSLA steels with optimized microstructure and mechanical performance.
Publisher: MDPI AG
Date: 03-05-2023
DOI: 10.3390/MA16093513
Abstract: In this study, the microstructure and performance of newly designed dual-phase steel (DP590) after joining by flash butt welding (FBW) for vehicle wheel rims was analysed and compared by two simulations, i.e., physical simulation and numerical simulation, due to the high acceptance of these two methodologies. Physical simulation is regarded as a thermal–mechanical solution conducted by the Gleeble 3500 simulator and which can distribute the heat-affected zone (HAZ) of the obtained weld joint into four typical HAZs. These are coarse-grained HAZ, fine-grained HAZ, inter-critical HAZ and sub-critical HAZ. A combination of ferrite and tempered martensite leads to the softening behaviour at the sub-critical HAZ of DP590, which is verified to be the weakest area, and influences the final performance due to ~9% reduction of hardness and tensile strength. The numerical simulation, relying on finite element method (FEM) analysis, can distinguish the temperature distribution, which helps us to understand the relationship between the temperature distribution and real microstructure erformance. Based on this study, the combination of physical and numerical simulations can be used to optimise the flash butt welding parameters (flash and butt processes) from the points of temperature distribution (varied areas), microstructure and performance, which are guidelines for the investigation of flash butt welding for innovative materials.
Publisher: Elsevier BV
Date: 11-2021
Publisher: Elsevier BV
Date: 03-2023
Publisher: Elsevier BV
Date: 10-2021
Publisher: Elsevier BV
Date: 06-2022
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 04-2022
Publisher: MDPI AG
Date: 10-07-2023
DOI: 10.3390/MA16144921
Abstract: The heat treatment process is a vital step for manufacturing high-speed railway spring fasteners. In this study, orthogonal experiments were carried out to obtain reliable optimised heat treatment parameters through a streamlined number of experiments. Results revealed that a better comprehensive mechanical performance could be obtained under the following combination of heat treatment parameters: quenching temperature of 850 °C, holding time of 35 min, medium of 12% polyalkylene glycol (PAG) aqueous solution, tempering temperature of 460 °C, and holding time of 60 min. As one of the most important testing criteria, fatigue performance would be improved with increasing strength. Additionally, a high ratio of martensite to ferrite is proven to improve the fatigue limit more significantly. After this heat treatment process, the metallographic microstructure and mechanical properties satisfy the technical requirements for the high-speed railway practical operation. These findings provide a valuable reference for the practical forming process of spring fasteners.
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 2021
Publisher: Elsevier BV
Date: 09-2018
Publisher: Elsevier BV
Date: 05-2019
Publisher: Springer International Publishing
Date: 2020
Publisher: Elsevier BV
Date: 04-2021
Publisher: Springer Science and Business Media LLC
Date: 26-10-2020
Publisher: Elsevier BV
Date: 07-2023
Publisher: Elsevier BV
Date: 08-2020
Publisher: Springer Science and Business Media LLC
Date: 11-05-2022
DOI: 10.1007/S00170-022-09261-6
Abstract: This paper compares the microstructure and mechanical evolution in a high-strength quenched and micro-alloyed steel during the austenitising bending process. Simulation results indicated a new finding that the stress neutral layer (SNL) tends to move to the tension zone during straining. The hardness gradient detected from the centre to compression/tension zones was resulted from comprehensive factors: First of all, the location of SNL revealed a prominent impact on strength. Second, the dislocation accumulation would be responsible for the hardness gradient on the surfaces. In addition, the overall strength decrease during straining was mainly ascribed to integrated effects of dynamic recovery (DRV) and dynamic recrystallisation (DRX). Apart from that, overall smaller martensite packet size and coarser prior austenite grains resulted in the increased hardness value at a lower bending degree. Also, the high consistency between experimental and simulation results is instructive for the practical forming process of railway spring fasteners.
Publisher: Springer Science and Business Media LLC
Date: 26-01-2021
Publisher: Elsevier BV
Date: 03-2020
Publisher: Elsevier BV
Date: 02-2023
Publisher: Elsevier BV
Date: 10-2020
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Jun Wang.