Article
Nanoscience & Nanotechnology
Alexandre Mathevon, Damien Fabregue, Veronique Massardier, Sophie Cazottes, Philippe Rocabois, Michel Perez
Summary: The Hy-MFC model was developed to predict the tensile properties of dual-phase steels based on microstructure parameters. It can be used for a wide range of steels and allows for alloy design and production-line monitoring. By considering the prior austenitic grain size and martensite composition, the model showed good agreement with experimental data, particularly for steels with various martensite fractions. Additionally, electron backscatter diffraction monitoring during tensile tests helped understand the interactions necessary for macroscopic hardening in dual-phase steels, with a proposed hybrid scaling transition law for small deformations.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Ning Zhao, Qiangqiang Zhao, Yanlin He, Rendong Liu, Weisen Zheng, Wenyue Liu, Yu Zhang
Summary: Two cost-saving marine steels with 1000 MPa yield strength were investigated for hydrogen embrittlement behavior using electrochemical technique. The hydrogen embrittlement resistance of steel B was found to be superior to steel A, potentially due to the presence of more nano-sized NbC particles. Additionally, the interface between carbide and matrix played a significant role in hydrogen trapping.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(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
Kazuki Okuno, Kenichi Takai
Summary: Factors promoting hydrogen-related intergranular fracture in tempered martensitic steel's elastic region were identified through frozen-in hydrogen distribution and tensile tests at -196°C. Results showed hydrogen embrittlement associated with intergranular fracture after precharging with hydrogen, while hydrogen embrittlement was also observed after preloading with elastic stress just before fracture strength at room temperature. The study revealed that reversibly accumulated hydrogen due to stress-induced diffusion onto prior austenite grain boundaries during stress loading at room temperature was responsible for intergranular fracture.
Article
Materials Science, Multidisciplinary
Ju Li, Jiajiao Wei, Yunliang Shao, Mengjia Li, Xiaomei Yu, Jin You Zheng, Dehai Ping, Ke Hou, Zhipeng Chang, Feng Yang, Min Li, Songjie Li
Summary: The hydrogen embrittlement behaviors of two mining chain steels were investigated, and it was found that the fracture stress decreases linearly with increasing hydrogen content. The ratio of intergranular fracture area to quasi-cleavage area increases dramatically at the turning points.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Akinobu Shibata, Takashi Yonemura, Yuji Momotani, Myeong-heom Park, Shusaku Takagi, Yazid Madi, Jacques Besson, Nobuhiro Tsuji
Summary: In this study, the hydrogen-related fracture behavior of specimens with different stress concentration factors was investigated through microstructure observation, FE simulation, and DIC analysis. It was found that when the hydrogen content was large, cracks initiated and propagated along the prior austenite grain boundaries, while for specimens with small hydrogen content, quasi-cleavage cracks formed at the surface and propagated along specific crystal planes. FE simulations revealed that local plastic deformation was enhanced by hydrogen, and the critical quantitative conditions for quasi-cleavage cracking initiation varied depending on the stress concentration factor.
Article
Materials Science, Multidisciplinary
Hanna Yang, Thanh Tuan Nguyen, Jaeyeong Park, Hyeong Min Heo, Junghoon Lee, Un Bong Baek, Young-Kook Lee
Summary: In this study, the resistance to hydrogen embrittlement of STS 304 austenitic stainless steel was investigated. The results showed that the resistance decreased with decreasing temperature and disappeared below -150 degrees C. The occurrence of hydrogen embrittlement at temperatures from 25 to -50 degrees C was attributed to strain-induced martensitic transformation and hydrogen diffusion into stress-concentrated regions.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
S. S. Shishvan, G. Csanyi, V. S. Deshpande
Summary: The susceptibility of ferritic steels to hydrogen embrittlement increases with decreasing strain rates. This is explained by the diffusion of hydrogen. However, for pre-charged specimens, lattice diffusion dominates and has no effect at such low strain rates. A model based on the Hydrogen Induced Fast-Fracture (HIFF) mechanism is presented to rationalize the strain rate dependence of hydrogen embrittlement. The dominant kinetics governing the strain rate sensitivity is the hydrogen desorption rates from cavity surfaces.
Article
Materials Science, Multidisciplinary
Ahjeong Lyu, Junghoon Lee, Jae-Hoon Nam, Minjeong Kim, Young-Kook Lee
Summary: In this study, the H absorption and H embrittlement (HE) resistance of medium (3-7 wt%) Mn martensitic steels were investigated. The 7 wt% Mn specimen had the highest diffusible H content due to the highest reversible H trap density when the specimens were electrochemically H-charged. When the diffusible H content was the same, the HE resistance deteriorated due to Mn addition, possibly caused by grain boundary decohesion and H segregation into the grain boundaries. However, this condition was improved by B addition due to enhanced grain boundary cohesion and suppression of H segregation into the grain boundaries.
Article
Materials Science, Multidisciplinary
Masoud Moshtaghi, Mahdieh Safyari
Summary: The joint effect of temperature and strain rate on hydrogen embrittlement properties of martensitic steel was investigated. It was found that at 50 °C, the elongation loss initially increased and then decreased with decreasing strain rate. This study provides the first report that at low strain rates, the temperature can mitigate hydrogen embrittlement susceptibility by increasing hydrogen effusion to the material surface and releasing a significant amount of hydrogen before the yield point. At 25 °C, the elongation loss increased with decreasing strain rate, as hydrogen could interact with mobile dislocations at lower strain rates, eventually leading to hydrogen-induced fracture. Additionally, intergranular cracks were observed, which can be attributed to prior austenite grain boundaries acting as paths for hydrogen-induced cracking.
Article
Chemistry, Physical
Haoyang Zhao, Pei Wang, Jinxu Li
Summary: Increasing vanadium content improves the resistance to hydrogen embrittlement in bolt steels, with vanadium precipitates acting as reversible hydrogen traps that inhibit hydrogen-dislocation interactions. Lower dislocation density and finer martensitic structure also contribute to hindering hydrogen-induced cracking.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Engineering, Mechanical
Ao Tang, Haiting Liu, Ran Chen, Guisen Liu, Qingquan Lai, Yong Zhong, Li Wang, Jeff Wang, Qi Lu, Yao Shen
Summary: The study revealed that different volume fractions and distributions of martensite can lead to different damage modes in ferrite-martensite dual-phase steels. Through mesoscale stress and strain analysis, we identified the origins of these damage modes.
INTERNATIONAL JOURNAL OF PLASTICITY
(2021)
Article
Engineering, Mechanical
Serena Corsinovi, Linda Bacchi, Matteo Mastroianni, Nevio Bigollo, Renzo Valentini
Summary: The aim of this study is to investigate innovative microstructure typologies and heat treatments for the manufacturing of high-strength steel fasteners with reduced susceptibility to hydrogen embrittlement. The research evaluates the role of microstructure and notch tensile strength (RNTS) on the hydrogen embrittlement of fasteners used in automotive industry. High-strength steel fasteners, despite their mechanical performance, are historically prone to hydrogen embrittlement, which is characterized by its unpredictability and ability to cause brittle fractures.
ENGINEERING FAILURE ANALYSIS
(2023)
Article
Materials Science, Multidisciplinary
M. Okayasu, M. Sato
Summary: The study developed a new hydrogen permeation system to understand the diffusion characteristics of hydrogen in carbon steels. It was found that hydrogen diffusion was effective in carbon steel plates heated to over 100 degrees C, but saturation occurred at 100 degrees C. The system allows for accurate quantification of hydrogen diffusion in carbon steels and suggests irreversible hydrogen charging in these materials.
EXPERIMENTAL MECHANICS
(2021)
Article
Nanoscience & Nanotechnology
Jun Zhang, Mingxin Huang, Binhan Sun, Boning Zhang, Ran Ding, Cheng Luo, Wu Zeng, Chi Zhang, Zhigang Yang, Sybrand van der Zwaag, Hao Chen
Summary: The effect of Lfiders banding on hydrogen embrittlement susceptibility of medium Mn steels was investigated by varying the degree of yield point elongation. It was found that steels with a larger YPE were more susceptible to hydrogen embrittlement. The presence of Lfiders banding and localized deformation play a key role in influencing the overall hydrogen embrittlement susceptibility of medium Mn steels.
SCRIPTA MATERIALIA
(2021)
