ORCID Profile
0000-0002-9938-6243
Current Organisations
Deakin University
,
Institute for Frontier Materials
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Publisher: Elsevier BV
Date: 07-2020
Publisher: MDPI AG
Date: 06-09-2020
DOI: 10.20944/PREPRINTS202009.0150.V1
Abstract: Two low-C steels microalloyed with Nb were fabricated by simulated strip casting, one with Mo and the other without Mo. Both alloys were coiled at 900 & deg C to investigate the effect of Mo on the precipitation behaviour in austenite in low-C strip-cast Nb steels. The mechanical properties results show that during the coiling at 900 & deg C the hardness of both alloys increases and reaches a peak after 3000 s and then decreased after 10,000 s. Additionally, the hardness of the Mo-containing alloy is higher than that of the Mo-free alloy in all coiling conditions. Thermo-Calc predictions suggest that MC-type carbides exist in equilibrium at 900 & deg C, which are confirmed by transmission electron microscopy (TEM). TEM examination shows that precipitates are formed after 1000 s of coiling in both alloys and the size of the particles is refined by the addition of Mo. Energy dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS) reveal that the carbides are enriched in Nb and N. The presence of Mo is also observed in the particles in the Nb-Mo steel during coiling. The concentration of Mo in the precipitates decreases with increasing particle size and coiling time. The precipitates in the Nb-Mo steel provide significant strengthening increments of up to 140 MPa, much higher than that in the Nb steel, ~ 96 MPa. A thermodynamic rationale is given, which explains that the enrichment of Mo in the precipitates reduces the interfacial energy between precipitates and matrix. This is likely to lower the energy barrier for their nucleation and also reduce the coarsening rate, thus leading to finer precipitates during coiling at 900 & deg C.
Publisher: Springer International Publishing
Date: 2019
Publisher: Elsevier BV
Date: 08-2020
Publisher: Elsevier BV
Date: 03-2023
Publisher: Emerald
Date: 04-01-2020
DOI: 10.1108/MEDAR-09-2018-0377
Abstract: This study aims to investigate two issues inherent in accounting judgements: the directional influence of uncertainty expressions and how they might positively or negatively affect accounting judgements and the foreign-language effect (FLE), which refers to the reduction of judgement bias that occurs when an accounting judgement is made in one’s foreign language. This study examines both issues in the context of accounting judgements made in Chinese and English languages. This study conducted two experiments. The first experiment applied a 2 × 2 between-subject research design, and the second experiment adopted a 2 × 2 within-subject approach. The overall results revealed that directionality biases existed in the exercise of accounting judgement in subjects’ native and foreign languages. However, when the language was switched from the subjects’ native tongue to a foreign language, overall directionality biases are reduced. This study suggests that the use of native and non-native languages can have unintended consequences on accounting judgements. However, because of the limitations of using students as proxies for professionals and applying self-assessed language scales, the literature would benefit from future research that extends the subject profile to professional accountants and that assesses language skills more objectively. This study contributes to the literature on cross-lingual accounting, both theoretically and methodologically. It also extends the FLE theory to an accounting context, providing insights on how language is involved in judgements concerning uncertainty expressions.
Publisher: Elsevier BV
Date: 06-2023
Publisher: Elsevier BV
Date: 12-2019
Publisher: Trans Tech Publications, Ltd.
Date: 15-11-2017
DOI: 10.4028/WWW.SCIENTIFIC.NET/MSF.879.1182
Abstract: As-cast low-carbon low-niobium steels fabricated by direct strip casting (DSC) were treated by simulated coiling in the lab. Coiling temperatures were carefully selected: (1) 900 ̊C (in the austenite) (2) 700 ̊C (during the austenite-to-ferrite transformation) (3) 650 ̊C (in the ferrite). Optical microscopy and transmission electron microscopy were used to examine the microstructure constituents and the precipitates. Mechanical properties were evaluated by Vickers macrohardness measurements. The results show that coiling treatment has a strong influence on the final microstructure and mechanical properties, thus highlighting the necessity to carefully design the coiling treatment. In addition, the differences in hardness for the three coiling temperatures derive from a complex combination of different strengthening mechanisms.
Publisher: Elsevier BV
Date: 04-2021
Publisher: Elsevier BV
Date: 03-2022
Publisher: Elsevier BV
Date: 03-2021
Publisher: MDPI AG
Date: 29-08-2022
DOI: 10.3390/MA15175965
Abstract: In this work, the precipitates in Ti−Mo−V steel were systematically characterized by high-resolution transmission electron microscopy (HRTEM). The thermodynamics and kinetics of precipitates in Ti−Mo and Ti−Mo−V steels were theoretically analyzed, and the effect of vanadium on the precipitation behavior was clarified. The results showed that the precipitation volume fraction of the Ti−Mo−V steel was significantly higher than that of Ti−Mo steel. The randomly dispersed precipitation and interphase precipitation (Ti, Mo, V)C particles coexisted in the Ti−Mo−V steel. When the temperature was higher than 872 °C, the addition of vanadium could increase the driving force for (Ti, Mo, V)C precipitation in austenite, resulting in an increased nucleation rate and shortened incubation period, promoting the (Ti, Mo, V)C precipitation. When the temperature was lower than 872 °C, the driving force for (Ti, Mo, V)C precipitation in austenite was lower than that for (Ti, Mo)C precipitation, and the incubation period of (Ti, Mo, V)C precipitation was increased. Moreover, it was also found that the precipitated-time-temperature curve of (Ti, Mo, V)C precipitated in the ferrite region was “C” shaped, but that of (Ti, Mo)C was “ε” shaped, and the incubation period of (Ti, Mo, V)C was significantly shorter than that of (Ti, Mo)C.
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 05-2020
Publisher: Elsevier BV
Date: 07-2022
Publisher: Springer Science and Business Media LLC
Date: 14-09-2018
Publisher: Elsevier BV
Date: 08-2020
Publisher: MDPI AG
Date: 05-10-2020
DOI: 10.3390/MET10101330
Abstract: Two low-C steels microalloyed with niobium (Nb) were fabricated by simulated strip casting, one with molybdenum (Mo) and the other without Mo. Both steels were heat treated to simulate coiling at 900 °C to investigate the effect of Mo on the precipitation behaviour in austenite in low-C strip-cast Nb steels. The mechanical properties results show that during the isothermal holding at 900 °C the hardness of both steels increases and reaches a peak after 3000 s and then decreased after 10,000 s. Additionally, the hardness of the Mo-containing steel is higher than that of the Mo-free steel in all heat-treated conditions. Thermo-Calc predictions suggest that MC-type carbides exist in equilibrium at 900 °C, which are confirmed by transmission electron microscopy (TEM). TEM examination shows that precipitates are formed after 1000 s of isothermal holding in both steels and the size of the particles is refined by the addition of Mo. Energy dispersive spectroscopy (EDS) and electron energy loss spectroscopy (EELS) reveal that the carbides are enriched in Nb and N. The presence of Mo is also observed in the particles in the Nb-Mo steel during isothermal holding at 900 °C. The concentration of Mo in the precipitates decreases with increasing particle size and isothermal holding time. The precipitates in the Nb-Mo steel provide significant strengthening increments of up to 140 MPa, higher than that in the Nb steel, ~96 MPa. A thermodynamic rationale is given, which explains that the enrichment of Mo in the precipitates reduces the interfacial energy between precipitates and matrix. This is likely to lower the energy barrier for their nucleation and also reduce the coarsening rate, thus leading to finer precipitates during isothermal holding at 900 °C.
Publisher: Elsevier BV
Date: 12-2021
Publisher: Elsevier BV
Date: 12-2022
Publisher: Elsevier BV
Date: 10-2019
Publisher: MDPI AG
Date: 08-08-2022
DOI: 10.3390/MA15155441
Abstract: In the present work, PH13-8Mo stainless steel parts without yttrium and with yttrium (Y) were manufactured by selective laser melting (SLM). The microstructure, phase composition and grain orientation of the stainless steels parts with Y and without Y were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), electron-backscatter diffraction (EBSD), transmission electron microscopy (TEM) and high-resolution transmission electron microscopy (HRTEM). The characterization results revealed that the addition of Y clearly refined the grain size of the PH13-8Mo steel formed part, resulting in more equiaxed massive grains and in a less anisotropic microstructure. PH13-8Mo stainless steel formed parts were mainly composed of martensite and retained austenite. The addition of Y could significantly increase the content of retained austenite and also generate nano-sized precipitates containing Y. The mechanical test results showed that both strength and toughness of the shaped parts containing Y were improved synergistically. The yield strength reached 1443 MPa, the elongation was 12.2%, and the room temperature impact energy reached 124.25 J/cm2. The strengthening and toughening by Y of the formed parts were mainly attributed to grain refinement, higher volume fraction of the retained austenite and the formation of nano-sized precipitates containing Y.
Publisher: Elsevier BV
Date: 07-2023
Publisher: Elsevier BV
Date: 05-2023
Publisher: China Science Publishing & Media Ltd.
Date: 2013
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1LC00658D
Abstract: Cost-effective technologies allow % economical savings, making clinical pathology more accessible worldwide.
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 08-2023
Publisher: University of Wollongong Library
Date: 12-2019
Publisher: Springer Science and Business Media LLC
Date: 27-04-2022
Publisher: Elsevier BV
Date: 09-2021
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 08-2023
Publisher: Elsevier BV
Date: 2022
Location: China
No related grants have been discovered for Lu Jiang.