Article
Mechanics
Junichiro Yamabe, Jean-Gabriel Sezgin, Kentaro Wada
Summary: The effect of hydrogen on the fatigue crack threshold and fatigue crack growth behavior of 17-4 PH steel was investigated. The experimental results showed that hydrogen accelerated the fatigue crack growth rate but did not degrade the fatigue crack threshold.
ENGINEERING FRACTURE MECHANICS
(2022)
Article
Engineering, Mechanical
Sang Min Lee, Sang-Youn Park, Un Bong Baek, Byoung-Ho Choi
Summary: The effect of high-pressure hydrogen on an SA-372 Grade J steel pressure vessel was analyzed through fatigue crack growth testing, fracture toughness testing, and finite element analysis. The test results, including the degradation of fracture toughness and the presence of hydrogen inflection in the fatigue crack growth rate, were used in the finite element analysis to analyze the fatigue crack growth behavior under different conditions. The residual fatigue life was evaluated considering the morphological evolution of the crack, the initial aspect ratio, and the initial crack-to-depth ratio.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Guoying Sui, Zhenqiang Wang, Jiarui Li, Chengzhi Zhao, Fengchun Jiang, Hongliang Li
Summary: In this study, the fatigue characteristics and cracking behaviors of 42CrMo steel with two different microstructures (fine/coarse-grain tempered sorbite/bainite) were investigated. It was found that fine-grain microstructure exhibits higher fatigue strength, while the coarse-grain microstructure has a higher fatigue crack growth threshold. The presence of multiple fatigue sources and higher-degree ratchetting-fatigue damage in the coarse-grain microstructure accelerates fatigue crack initiation. Roughness-induced crack closure in the coarse-grain microstructure leads to a delay in fatigue crack growth and an increase in the fatigue crack growth threshold.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Engineering, Mechanical
Chengshuang Zhou, Bei Fang, Jing Wang, Dan Tang, Huimin Tao, Yanming He, Zhengrong Zhou, Changfeng Chen, Lin Zhang
Summary: The behavior of as-received and cold-rolled Fe-25Mn-10Ni-0.65C twinning-induced plasticity steel in hydrogen environment was studied using fatigue crack growth rate tests. It was found that TWIP steel exhibits weak hydrogen embrittlement susceptibility due to the formation of deformation twins at the crack tip. Cold rolling was shown to significantly improve the hydrogen embrittlement resistance and fatigue resistance of TWIP steel.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Materials Science, Multidisciplinary
Yang Chen, Zhiming Xu, Xiaoxin Zhang, Tianyin Zhang, Johnston Jackie Tang, Zhengqi Sun, Yongfeng Sui, Xianhong Han
Summary: The study investigated the reversible/irreversible recovery of mechanical properties and microstructure characteristics of a typical hot-stamped steel B1500HS under different hydrogen permeation conditions. The research found that the negative impact of hydrogen embrittlement shifted from reversible to irreversible with the increase of charging current, and hydrogen blistering and charging-induced cracks were observed in irreversible situations. Additionally, plastic pre-straining or extended charging period enhanced the adverse influence of hydrogen embrittlement.
MATERIALS & DESIGN
(2021)
Article
Chemistry, Physical
Yuhei Ogawa, Keiichiro Iwata
Summary: This study investigates the fatigue crack growth (FCG) property of pearlitic steel in a high-pressure hydrogen gas environment. Results show that pearlitic steel exhibits less hydrogen-induced FCG acceleration compared to martensite and pure ferritic iron at the same strength level, especially under slow loading-rate conditions, which is beneficial for suppressing time-dependent cracking.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Huixing Li, Futao Dong, Qingjun Zhou, Zhiming Shi, Jeffrey Venezuela, Ming Yan, Ruth Knibbe, Mingxing Zhang, Andrej Atrens
Summary: The load-controlled fatigue behavior of a dual-phase advanced high-strength steel was studied in air and with hydrogen. The fatigue lives with hydrogen and in air were not significantly different, but hydrogen had a clear influence on the fatigue fractography. The hydrogen diffusion coefficient and hydrogen content were evaluated using hydrogen permeation experiments.
Article
Engineering, Mechanical
D. Harandizadeh Najafabadi, A. Barabi, D. Thibault, M. Brochu
Summary: In this study, the influence of hydrogen on the fatigue crack propagation rate in tempered martensitic stainless steel was investigated. An original model was proposed and validated through experiments. The results showed that there is a critical stress intensity factor range at which the impact of hydrogen on the fatigue crack propagation rate is maximum.
THEORETICAL AND APPLIED FRACTURE MECHANICS
(2023)
Article
Chemistry, Physical
Xiuru Fan, Zhishan Mi, Li Yang, Hang Su
Summary: In this work, first-principles methods were used to simulate the interactions between hydrogen and common alloying elements in HSLA steel. Hydrogen is being increasingly recognized as a potential clean energy source. HSLA steel, which possesses a balance of strength, toughness, and resistance to hydrogen embrittlement, is expected to be suitable for large-scale hydrogen storage and transportation. However, due to the small size of hydrogen atoms, it is challenging to directly observe the mechanism of hydrogen embrittlement through experimental methods. To understand this mechanism at the atomic level, DFT methods were applied to study the effects of alloying elements doping on the bulk and grain boundary structures of bcc-Fe. Additionally, the potential application of DFT in providing theoretical guidance for the design of HSLA steel is discussed.
Article
Chemistry, Physical
Sho Takeda, Yoshikazu Ohara, Tetsuya Uchimoto, Hirotoshi Enoki, Takashi Iijima, Eri Tokuda, Takumi Yamada, Yuzo Nagatomo
Summary: This study investigated the feasibility of fusion sensing of eddy current testing (ECT) and ultrasonic testing (UT) as effective tools to clarify the hydrogen-embrittlement mechanism of austenitic stainless steels. Fatigue testing was conducted on hydrogen-charged and uncharged AISI 304 specimens. The effects of hydrogen exposure on martensitic transformation, crack closure, and crack face morphology were examined using ECT and UT.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Nanoscience & Nanotechnology
Rongjian Shi, Yanlin Wang, Supeng Lu, Saiyu Liu, Yanqi Tu, Shani Yang, Kewei Gao, Xu-Sheng Yang, Xiaolu Pang
Summary: The high-strength spring steel demonstrates superior hydrogen embrittlement resistance and satisfactory work hardening capacity after hydrogen pre-charging with dispersed multiple precipitates via multi-microalloying of 1.04 wt% Cr and 0.14 wt% V. The multiple precipitates include isolated (Mn, Cr, V)-enriched cementite, isolated V-enriched VC, and co-precipitation of cementite and VC, which act as effective hydrogen traps and reduce HE susceptibility by 23%, making this strategy beneficial for designing high-strength and HE-resistant automotive steels.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Chemistry, Physical
Zhiwei Gao, Baoming Gong, Quanjun Xu, Dongpo Wang, Caiyan Deng, Yang Yu
Summary: The study investigates the mutual effect of hydrogen, microstructures, and stress concentration on the fatigue failure of X65 steel welded joints under different environmental conditions. It was found that weld metal and coarse grain heat-affected zone are more prone to hydrogen embrittlement and cyclic strain localization in air.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Metallurgy & Metallurgical Engineering
Gaku Kitahara, Takashi Asada, Hideaki Matsuoka
Summary: The hydrogen embrittlement properties of spot welds made with AHSS sheets were evaluated, and the relationship between diffusible hydrogen content, tensile shear strength, and fatigue life was investigated. The results showed that an increase in diffusible hydrogen content led to a decrease in fatigue life.
ISIJ INTERNATIONAL
(2023)
Article
Mechanics
Zahra S. Hosseini, Mohsen Dadfarnia, Akihide Nagao, Masanobu Kubota, Brian P. Somerday, Robert O. Ritchie, Petros Sofronis
Summary: Hydrogen-accelerated fatigue crack growth is a severe manifestation of hydrogen embrittlement, but a lack of a descriptive constitutive model of the hydrogen/material interaction at the macroscale hinders the development of a mechanistic and predictive model. By utilizing data from strain-controlled cyclic loading and stress-controlled ratcheting tests, a constitutive model capable of capturing material hardening or softening under cyclic straining or ratcheting can be developed.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2021)
Article
Engineering, Mechanical
Thanh Tuan Nguyen, Hyeong Min Heo, Jaeyeong Park, Seung Hoon Nahm, Un Bong Beak
Summary: Testing in a hydrogen-containing atmosphere showed significant reductions in fracture toughness and acceleration of fatigue crack growth rate in metals. Therefore, the design fatigue life of structural pipelines exposed to hydrogen is significantly shorter compared to those in ambient air.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Ahmad Mirzaei, Peter D. Hodgson, Xiang Ma, Vanessa K. Peterson, Ehsan Farabi, Gregory S. Rohrer, Hossein Beladi
Summary: This study investigated the influence of parent austenite grain refinement on the intervariant boundary network in a lath martensitic steel. It found that refining the parent austenite grain led to a decrease in the fraction of certain boundaries in the martensite and an increase in the connectivity of low energy boundaries, ultimately improving the impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
N. L. Church, C. E. P. Talbot, L. D. Connor, S. Michalik, N. G. Jones
Summary: Metastable beta Ti alloys based on the Ti-Nb system have attracted attention due to their unique properties. However, the unstable cyclic behavior of these alloys has hindered their widespread industrial use. Recent studies have shown that internal stresses, including those from dislocations, may be responsible for this behavior. This study demonstrates that inter-cycle thermal treatments can mitigate the unstable cyclic behavior, providing a significant breakthrough in our understanding of Ti-Nb superelastic materials.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Di Zhao, Chenchen Zhao, Ziyang Xiu, Jiuchun Yan
Summary: This study proposes a novel strategy for achieving the bonding of SiC ceramic and Al alloy using ultrasound. The ultrasound promotes the dissolution of Al into the solder, activating the solder and triggering the interfacial reaction between SiC ceramic and solder. With increasing ultrasonic duration, the bonding between SiC and Al transitions from partial to full metallurgical bonding.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Kang Du, Yang Zhang, Guangda Zhao, Tao Huang, Liyuan Liu, Junpeng Li, Xiyu Wang, Zhongwu Zhang
Summary: This paper systematically investigated the evolution of microstructure in Fe-Ni-Co-Al polycrystalline alloys and its effects on mechanical properties. The results revealed that the migration of grain boundaries in different processes is driven by different factors, which impacts the grain orientation and precipitate formation. In the process of directional recrystallization, grains with specific orientations grow in the grain boundary region and form the dominant orientation, while grains with lower migration rate form the minor orientation. The alloy produced through directional recrystallization exhibited good recoverable strain and superelastic strain, while the alloy produced through solid solution treatment showed no evident superelastic behavior.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Edohamen Awannegbe, Liang Chen, Yue Zhao, Zhijun Qiu, Huijun Li
Summary: This study employed laser metal deposition to additively manufacture Ti-15Mo wt% alloy, and subsequently subjected it to post-fabrication uniaxial thermomechanical processing. The results showed that different zones in the microstructure remained after processing, and deformation mechanisms mainly involved slip and martensite formation. The compressive mechanical properties were found to be dependent on strain rate, with higher flow stress and compressive strength observed at higher strain rates. Grain structure homogenisation was not achieved, leading to anisotropic tensile properties.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Reza Khatib Zadeh Davani, Enyinnaya George Ohaeri, Sandeep Yadav, Jerzy A. Szpunar, Jing Su, Michael Gaudet, Muhammad Rashid, Muhammad Arafin
Summary: This research aims to investigate the effect of roughing and finishing reductions on crystallographic texture. The results show significant heterogeneity in the centerline region, with higher intensity of certain textures. Drop Weight Tear Test indicates that steel specimens with lower and medium reductions exhibit superior low-temperature impact toughness compared to steel with higher reductions. The electrochemical hydrogen charging experiments confirm the presence of internal hydrogen cracks only in steel with lower and medium reductions.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Flavio De Barbieri, Denis Jorge-Badiola, Rodrigo Allende, Karem Tello, Alfredo Artigas, Franco Perazzo, Henry Jami, Juan Perez Ipina
Summary: This study examines the effect of Cr additions on the mechanical behavior of TWIP steel at temperatures ranging from 25°C to 350°C. The results indicate that different temperature-dependent strengthening mechanisms, including mechanical twinning, Dynamic Strain Aging, and slip bands, are at play. The stacking fault energy (SFE) influences the percentage of mechanical twinning, which in turn affects the strain hardening rate.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Hanlin Peng, Siming Huang, Ling Hu, Bingbing Luo, Liejun Li, Ian Baker
Summary: This study explores the weldability, microstructures, and mechanical properties of two L1(2)-nanoparticle-strengthened medium-entropy alloys after electron beam welding (EBW). The results show that strong yet ductile defect-free joints were produced, with larger grain sizes in the fusion zones compared to the heat-affected zones and base materials. Both EBWed MEAs exhibited high yield strengths, high ultimate tensile strengths, and good fracture strains at 77 K. The V-doping improved the cryogenic mechanical properties of the TMT MEA.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yongxin Wang, Lei Chen, Lizi Shao, Shuo Hao, Motomichi Koyama, Xingzhou Cai, Xiaocong Ma, Miao Jin
Summary: This study investigated the tensile deformation behavior of an Mn-N bearing lean duplex stainless steel with metastable austenite. The results showed that the strain rate had significant influence on the work hardening, strain-induced martensitic transformation, and fracture mechanism.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Jong Woo Won, Seulbi Lee, Hye-Jeong Choe, Yong-Taek Hyun, Dong Won Lee, Jeong Hun Lee
Summary: Cold-rolled pure titanium showed improved sheet formability after undergoing cryogenic-deformation treatment. This treatment increased the thinning capability of the titanium and suppressed cracking during sheet forming. The formation of twins during deformation contributed to high thinning capability and increased strength through grain refinement and dislocation accumulation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Handong Li, Lin Su, Lijuan Wang, Yanbin Jiang, Jiahui Long, Gaoyong Lin, Zhu Xiao, Yanlin Jia, Zhou Li
Summary: Homogenization heat treatment is a key procedure in controlling the second phase, enhancing composition uniformity, and workability of as-cast Cu-15Ni-8Sn alloy. This study found that electropulsing treatment (EPT) can significantly reduce treatment temperature and time, improve elongation and overall mechanical properties of the alloy.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Yuxuan Wang, Juntao Zou, Lixing Sun, Yunfei Bai, Zhe Zhang, Junsheng Cheng, Lin Shi, Dazhuo Song, Yihui Jiang, Zhiwei Zhang
Summary: A novel mechanical-heat-electricity synergistic method was proposed to enhance the mechanical properties of Cu-15Sn-0.3Ti alloy by forming annealing twins (ATs). The combination method of Rotary swaging (RS) and Electric pulse treatment (EPT) successfully induced recrystallization and refinement of the microstructure, leading to a significant increase in the strength of the alloy within a short time.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Zhiyi Ding, Jiangtao Xie, Tong Wang, Aiying Chen, Bin Gan, Jinchao Song
Summary: This study demonstrated the Ta-induced strengthening of CoCrNi-AlTi MEAs using nanoscale heterogeneous coherent precipitates. The addition of Ta and aging treatments significantly enhanced the mechanical properties of the alloy, including yield strength, ultimate tensile strength, and elongation.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Z. Y. You, Z. Y. Tang, B. Wang, H. W. Zhang, P. Li, L. Zhao, F. B. Chu, H. Ding
Summary: The mechanical properties and microstructural evolution of C-doped TRIP-assisted HEA under dynamic loading conditions were systematically investigated in this study. The results showed that dynamic tensile deformation led to an increase in yield strength and a decrease in ultimate tensile strength, with a trend towards increased total elongation. The primary deformation mechanisms shifted from TRIP and TWIP effects to deformation twinning and dislocations. The presence of carbides formed through C-doping hindered dislocation slip and promoted the activation of multiple twinning systems.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)
Article
Nanoscience & Nanotechnology
Feng Qin, Feihu Chen, Junhua Hou, Wenjun Lu, Shaohua Chen, Jianjun Li
Summary: Plastic instability in strong multilayered composites is completely suppressed by architecting nanoscale BCC Nb crystalline-amorphous CuNb interfaces.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2024)