Article
Chemistry, Physical
M. Pinson, H. Springer, T. Depover, K. Verbeken
Summary: This study evaluates the interaction between hydrogen and hypereutectoid martensitic Fe-1.1C alloy, showing that the presence of H leads to additional cracking and affects the decomposition temperature of retained austenite.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Seong Hoon Kim, Ji Hoon Kim, Jae Hoon Lee, Dong-Woo Suh, Jae Sang Lee
Summary: The present study investigates the phase constitution of a medium-carbon Q&P steel by comparing various approaches to the transformation stasis of bainitic ferrite and finds that the modified GEB approach can predict the phase constitution most accurately.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Chemistry, Physical
Y. Du, X. H. Gao, Z. W. Du, L. Y. Lan, R. D. K. Misra, H. Y. Wu, L. X. Du
Summary: This study focused on elucidating hydrogen diffusion behavior in martensite matrix with retained austenite (RA), with a specific emphasis on the effect of microstructure on hydrogen diffusion behavior and hydrogen diffusivity calculation for different microstructural components. The highest effective hydrogen diffusion coefficient was observed in quenched martensite (QM) due to its high dislocation density. However, the effective hydrogen diffusion coefficient decreased as intercritical annealing temperature increased, attributed to the decrease in dislocation density and increase of RA. Furthermore, according to the Maxwell-Garnett equation, the hydrogen diffusion coefficient for grain boundary (GB) was 7.99 x 10(-8) m(2)/s and for tempered martensite (TM) was 7.84 x 10(-11) m(2)/s.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Jun Zhang, Jie Su, Boning Zhang, Yi Zong, Zhigang Yang, Chi Zhang, Hao Chen
Summary: Hydrogen embrittlement of steels is directly correlated to hydrogen diffusion and trapping in the microstructure, which is difficult to measure accurately with modern experimental techniques. A phase-field model introducing a chemical potential well of hydrogen in the grain boundaries was proposed to simulate hydrogen diffusion and trapping in polycrystalline iron. Interestingly, it was found that grain boundaries act as connected trap sites, having a complex influence on the effective diffusivity of hydrogen, which is strongly associated with grain boundary diffusivity and binding energy.
ACTA METALLURGICA SINICA-ENGLISH LETTERS
(2021)
Article
Chemistry, Physical
Dannisa R. Chalfoun, Mariano A. Kappes, Pablo Bruzzoni, Mariano Iannuzzi
Summary: Hydrogen permeation experiments were conducted on quenched and tempered low alloy steels with varying Ni contents at different temperatures. The results showed that increasing Ni concentration decreases the permeation coefficient, apparent diffusion coefficient, and hydrogen concentration on the charging surface. Additionally, the study calculated the hydrogen binding energy and trap density, and found that they are not clearly correlated with Ni content.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Chemistry, Physical
Simon Vander Vennet, Silvia Leitner, Vsevolod Razumovskiy, Werner Ecker, Tom Depover, Kim Verbeken
Summary: This study investigates the effect of a constant load on hydrogen diffusion through a Q&P steel containing metastable retained austenite. The results show that hydrogen diffusion is delayed under all stressed conditions, even at stresses in the elastic regime, with the delay increasing with the applied load. Thermal desorption spectroscopy reveals the presence of a high temperature peak in the samples tested under load, indicating hydrogen effusion and release due to the transformation of retained austenite.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2023)
Article
Materials Science, Multidisciplinary
T. Sourmail, L. Otter, S. Collin, M. Billet, A. Philippot, F. Cristofari, P. Secordel
Summary: This study investigates the direct and indirect decomposition of retained austenite during tempering in a 0.2C wt% steel with a carbide-free bainitic microstructure. Comparisons are made between two nearly identical steels, one with vanadium and one without, to discuss the influence of vanadium on both mechanisms. The results suggest that vanadium has an impact on the decomposition of retained austenite and hardness changes during tempering.
MATERIALS CHARACTERIZATION
(2021)
Review
Materials Science, Multidisciplinary
Zongbiao Dai, Hao Chen, Ran Ding, Qi Lu, Chi Zhang, Zhigang Yang, Sybrand van der Zwaag
Summary: This paper reviews the methods of improving the strength-elongation product of advanced high strength steels by creating tailored multi-phase microstructures and emphasizes the importance of the metastable retained austenite. Through analyzing the role of element partitioning, it provides a conceptual and theoretical framework to accelerate the further development of this class of steels.
MATERIALS SCIENCE & ENGINEERING R-REPORTS
(2021)
Article
Nanoscience & Nanotechnology
Maria-Ioanna T. Tzini, John S. Aristeidakis, Peter Christodoulou, Alexis T. Kermanidis, Gregory N. Haidemenopoulos, Daniel Krizan
Summary: Austenite stability and dispersion are key parameters controlling the strain-induced transformation in TRIP steels. This study presents an integrated approach using multi-phase field modeling to describe the microstructural evolution of TRIP700 steel. By considering the local properties of retained austenite (RA), it was found that refined RA is more stable and transforms into martensite at a later stage of deformation. The simulations were validated against experiments conducted on TRIP700 steel, showing good agreement. This integrated approach can assist in designing optimal microstructural characteristics for TRIP steels.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Mechanical
Binggang Liu, Wei Li, Yuantao Xu, Yihong Nie, Xiaoshuai Jia, Xuejun Jin
Summary: Hydrogen was found to play a dominant role in promoting microcracking during impact-wear deformation in bainitic steel, leading to the formation of flakes on the worn surface and decreasing wear resistance.
Article
Nanoscience & Nanotechnology
Mitsuhiro Okayasu, Takafumi Fujiwara
Summary: Experimental and numerical studies revealed that severe hydrogen embrittlement occurred in the DS sample, while weak hydrogen embrittlement was detected in the AS and FS samples. Hydrogen trapping occurred in the low atomic density zones in the boundaries between alpha and gamma phases in the DS sample.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Jimin Nam, Junghoon Lee, Hanji Park, Cheolho Park, Changhoon Lee, Junho Chung, Seung-gun Lee, Namhyun Kang
Summary: This study investigates the effect of increasing Mo content on hydrogen embrittlement resistance in bainitic steels. The results show that while the addition of Mo increases the strength of the steel, the hydrogen embrittlement resistance is almost the same for steels with 0.2% Mo and 0.02% Mo. This is because the increase in Mo content leads to an increase in constituents that are sensitive to hydrogen embrittlement, but the Mo solutes delay hydrogen diffusion, thereby mitigating the degradation in embrittlement resistance.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
L. J. Wei, X. M. Ji, Y. S. Yu, R. D. K. Misra, P. C. Liu, X. M. Wang
Summary: This research addresses the significance of retained austenite on the fire resistance of high strength steel by studying its transformation at elevated temperature. The steel exhibited excellent fire resistance due to the decomposition of retained austenite and interface precipitation of nano-cementite. The novel process involving intercritical tempering resulted in a multiphase microstructure of 690 MPa steel with high yield strength and low yield ratio.
Article
Nanoscience & Nanotechnology
X. L. An, R. M. Zhang, Y. X. Wu, Y. Zou, L. T. Zhang, K. Zhang, L. Y. Wang, Y. S. Li, C. R. Hutchinson, W. W. Sun
Summary: The results from comparing two medium Mn steels with different carbon contents show that higher carbon leads to stronger austenite and TRIPed martensite, resulting in more pronounced strain hardening behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Civil
Aleksandra Kozlowska, Adam Grajcar, Aleksandra Janik, Krzysztof Radwanski, Ulrich Krupp, Krzysztof Matus, Mateusz Morawiec
Summary: Advanced medium-Mn sheet steels offer a cost-effective and lightweight solution for automotive parts, with improved safety and optimized environmental performance. The mechanical stability of retained austenite plays a crucial role in enhancing the strength-ductility balance, while benefiting from manganese addition in the range of 3-5%. Temperature dependence and stimulation by manganese addition were observed in the pronounced stability of retained austenite.
ARCHIVES OF CIVIL AND MECHANICAL ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Hong Chen, Fei Xiao, Xiao Liang, Zhenxing Li, Zhu Li, Xuejun Jin, Na Min, Takashi Fukuda
SCRIPTA MATERIALIA
(2019)
Article
Nanoscience & Nanotechnology
Yuantao Xu, Wei Li, Xunwei Zuo, Yu Li, Caiyi Zhang, Na Min, Hao Chen, Xuejun Jin
SCRIPTA MATERIALIA
(2019)
Article
Nanoscience & Nanotechnology
Xiao Liang, Fei Xiao, Hong Chen, Zhenxing Li, Zhu Li, Xuejun Jin, Takashi Fukuda
SCRIPTA MATERIALIA
(2019)
Article
Nanoscience & Nanotechnology
Fei Xiao, Xiao Liang, Hong Chen, Zhenxing Li, Zhu Li, Xuejun Jin, Takashi Fukuda
SCRIPTA MATERIALIA
(2019)
Article
Engineering, Mechanical
Binggang Liu, Wei Li, Xianwen Lu, Xiaoshuai Jia, Xuejun Jin
Article
Materials Science, Multidisciplinary
Y. W. Song, Mingjiang Jin, Shungui Zuo, Xuejun Jin
Article
Nanoscience & Nanotechnology
Yong Li, Wei Li, Na Min, Wenqing Liu, Caiyi Zhang, Xuejun Jin
SCRIPTA MATERIALIA
(2020)
Article
Materials Science, Multidisciplinary
Yuanwei Song, Mingjiang Jin, Xiaocang Han, Xiaodong Wang, Peng Chen, Xuejun Jin
Summary: The study introduces a Ni50.8Ti49.2 alloy with ultrahigh damping capacity achieved through a combination of severe deformation, insufficient annealing, and low-temperature aging. The high broad internal friction plateau in this alloy is attributed to the presence of nanodomains, stable coexistence of B19'-phase and R-phase, abundant phase boundaries, and movable interfaces. The critical role of low-temperature aging in inducing nanodomains and the generation of high-density nanodomains through insufficient annealing and low-temperature aging processes are confirmed.
Article
Nanoscience & Nanotechnology
Shilong Liu, Bin Hu, Wei Li, R. D. K. Misra, Xuejun Jin
Summary: Research shows that in ultra-high strength steels, the formation of nanoscale twinned martensite and retained austenite after intercritical annealing and rapid quenching significantly enhances the uniform elongation of the material without compromising ultimate tensile strength.
SCRIPTA MATERIALIA
(2021)
Article
Nanoscience & Nanotechnology
L. L. Wei, G. H. Gao, J. Kim, R. D. K. Misra, C. G. Yang, X. J. Jin
Summary: This article investigates the mechanical behavior of Fe-27Mn-9Al-1C austenitic steel microalloyed with Nb, specifically focusing on its work hardening behavior and plasticity mechanisms. The study reveals that pronounced planar dislocation slip occurs during plastic deformation, and the shearing of precipitates and refinement of slip bands contribute to strain hardening of the steel. Annealing twin boundaries act as dislocation sources, promoting further subdivision of slip bands and suppressing strain localization.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Ruihang Hou, Fei Xiao, Zhu Li, Xuejun Jin
Summary: The study investigates the effects of crystallographic texture on the superelasticity and elastocaloric effect of nanograin Ti-44Ni-5Cu-1Al rolled sheet. As the angle between tensile direction and rolling direction increases, the intergranular constraint effect reaches its maximum in the transverse direction, resulting in similar monotonic decreasing trends for transformation strain and adiabatic temperature change. In the rolling direction, the material coefficient of performance reaches 11.2.
SCRIPTA MATERIALIA
(2022)
Article
Microscopy
Qi Lu, Jiayi Wu, Shilong Liu, Shiqi Zhang, Xiaorong Cai, Wei Li, Jun Jiang, Xuejun Jin
Summary: A multi-modal deep learning approach is proposed to predict the geometrically necessary dislocation (GND) density in materials. The method utilizes electron backscatter patterns (EBSPs) and dislocation configurations to achieve accurate predictions. The study also introduces a specific data augmentation strategy for the GND prediction task. High accuracy is achieved on aluminum samples, and the networks are robust and capable of real-time analysis.
Article
Materials Science, Multidisciplinary
Peng Chen, Xiaorong Cai, Na Min, Yunfan Liu, Zhengxiong Wang, Mingjiang Jin, Xuejun Jin
Summary: The fatigue resistance of superelastic NiTi shape memory alloy wires was improved by combining mechanical training and nanocrystallization. Stress-controlled training effectively improved the functional stability and structural fatigue life of nanocrystalline NiTi wires. The training-induced lattice rotation and preferential grain orientation decreased local stress concentration and improved the structural fatigue life.
Article
Multidisciplinary Sciences
Yi-Sheng Chen, Hongzhou Lu, Jiangtao Liang, Alexander Rosenthal, Hongwei Liu, Glenn Sneddon, Ingrid McCarroll, Zhengzhi Zhao, Wei Li, Aimin Guo, Julie M. Cairney
