Article
Nanoscience & Nanotechnology
L. Cupertino Malheiros, A. Oudriss, S. Cohendoz, J. Bouhattate, F. Th, M. Piette, X. Feaugas
Summary: Electrochemical permeation cell built on a Instron tensile testing machine allows fracturing notched specimens under hydrogen flux while monitoring simultaneously the flow stress and the permeation anodic current. The analysis of fracture surfaces reveals that cracking initiates at the hydrogen-entry surfaces as quasi-cleavage regions followed by ductile propagation. The finite element method (FEM) calculates local failure criteria, revealing the importance of hydrogen-mechanical-structural interactions in fracture analysis.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Kyung-Shik Kim, Jee-Hyun Kang, Sung-Joon Kim
Summary: The study revealed that carbon can alleviate the impact of hydrogen on the tensile properties of stainless steel, but increasing the carbon content does not significantly affect hydrogen diffusivity. Cracks induced by hydrogen mainly occur at grain boundaries and propagate inside grains, but are suppressed by grain boundaries.
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
Materials Science, Multidisciplinary
Shenguang Liu, Weijie Wu, Hao Fu, Jinxu Li
Summary: This study examines the equality in assessing the strength of hydrogen-assisted fractures using slow strain rate tensile (SSRT) and constant load tensile (CLT) methods for three precipitation-hardened martensitic stainless steels with different sized second-phase particles. SSRT showed higher fracture strength than CLT for PH13-8Mo and 17-4PH with nano-sized precipitates. However, for 15-6PH with both nano-sized precipitates and large-sized carbides, cracks at the larger-sized carbide/matrix interface resulted in lower fracture strength for SSRT. Additionally, we conclude that the hydrogen-assisted threshold fracture strength of CLT can be estimated by using SSRT when there are no large-sized particles present in high-strength steels.
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
Materials Science, Multidisciplinary
Huili Sun, Wenting Lv, Yu Yang, Dongdong Li, Luchun Yan, Xiaolu Pang, Yang He, Kewei Gao
Summary: By altering the structures of Cu-rich precipitates, the hydrogen embrittlement susceptibility of high-strength steels can be significantly reduced while maintaining their ultimate tensile strength. The 9R-structured Cu-rich precipitates show the strongest binding and trapping capacity with hydrogen.
Article
Chemistry, Physical
C. San Marchi, J. A. Ronevich, J. E. C. Sabisch, J. D. Sugar, D. L. Medlin, B. P. Somerday
Summary: Austenitic stainless steels are widely used in harsh environments, including high-pressure gaseous hydrogen service. The tensile ductility of these materials is sensitive to materials and environmental variables, leading to significant ductility loss when exposed to hydrogen. Internal hydrogen influences deformation characteristics, driving local damage accumulation and fracture.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(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
Chemistry, Physical
Fengjiao Ye, Te Zhu, Kazuhiro Mori, Qiu Xu, Yamin Song, Qianqian Wang, Runsheng Yu, Baoyi Wang, Xingzhong Cao
Summary: The study systematically investigated the effects of dislocations and hydrogen concentration on hydrogen embrittlement in 316 austenitic stainless steels. The results showed a decrease in tensile strength and ductility of 316SS after hydrogen charging, with the severity of hydrogen embrittlement depending on hydrogen concentration. X-ray diffraction results revealed the presence of martensite in hydrogen-charged specimens, attributed to hydrogen-induced lattice expansion. Additionally, an increase in hydrogen concentration led to a transformation in fracture mode and the formation of effective hydrogen-trapping sites.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Chemistry, Physical
Thanh Tuan Nguyen, Kyung-Oh Bae, Park Jaeyeong, Seung Hoon Nahm, Un Bong Baek
Summary: There is no common standard for blended hydrogen use in the natural gas grid. The need for quantitative evaluation of hydrogen-natural gas mixtures to ensure the mechanical performance of pipeline structures is becoming increasingly evident. This study provides experimental data on the effect of H-2 concentration in a methane/hydrogen gas mixture and compares the mechanical performance of three pipeline steels.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Nanoscience & Nanotechnology
Kazuho Okada, Akinobu Shibata, Taisuke Sasaki, Hisashi Matsumiya, Kazuhiro Hono, Nobuhiro Tsuji
Summary: This study aimed to improve the resistance against hydrogen embrittlement by increasing the concentration of carbon segregated at prior austenite grain boundary (PAGB), XPAGB, in low-carbon martensitic steels. The specimens with and without carbon segregation treatment (Non-seg and Seg specimens, respectively) had similar microstructures, except for higher XPAGB in the Seg specimen. The Seg specimen exhibited higher maximum stress and smaller fraction of intergranular fracture surface under hydrogen-charged conditions, indicating that segregated carbon suppressed hydrogen accumulation and increased cohesive energy of PAGB.
SCRIPTA MATERIALIA
(2023)
Article
Materials Science, Multidisciplinary
Chuansen Liu, Ji Liu, Changfeng Chen, Haobo Yu
Summary: The crack propagation mechanism of 316L austenitic stainless steel in H2S environment is revealed by dislocation configurations. Slow strain rate tensile test results indicate that fracture elongation decreases and increases with temperature, suggesting stress concentration in different positions due to dislocation configurations. The relationship between crack propagation, hydrogen embrittlement, and stress concentration is analyzed, proposing a mechanism for fracture morphology change with temperature.
Article
Engineering, Mechanical
Xu Xiuqing, An Junwei, Wen Chen, Niu Jing
Summary: The study reveals that under the condition of electrolytic hydrogen charging, the hydrogen embrittlement mechanism of AISI 321 stainless steel mainly manifests as the influence of hydrogen on the fracture mode and plasticity of the material.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Nanoscience & Nanotechnology
Akinobu Shibata, Ivan Gutierrez-Urrutia, Kazuho Okada, Goro Miyamoto, Yazid Madi, Jacques Besson, Kaneaki Tsuzaki
Summary: The study investigated the relationship between the mechanical response and microscopic crack propagation behavior of hydrogen-related intergranular fractures in high-strength martensitic steel. The results showed that hydrogen can affect crack tip morphology and induce strain localization in the vicinity of intergranular cracks.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Angelina Strakosova, Michaela Roudnicka, Ondrej Ekrt, Dalibor Vojtech, Alena Michalcova
Summary: The study aimed to investigate the susceptibility of additively manufactured high strength X3NiCoMoTi 18-9-5 maraging steel to hydrogen embrittlement. Results showed that hydrogen charging led to lower tensile strength and increased brittleness in the material compared to uncharged samples. Fractography confirmed the loss of plasticity with a transition from dimple-like fractures to smooth facets on the surface after hydrogen charging.
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)