Article
Engineering, Mechanical
Xiaoli Zhao, Yongjian Zhang, Weijing Hui, Chengwei Shao, Cunyu Wang, Han Dong
Summary: In the study of the influence of tempering on hydrogen embrittlement behavior in hot-rolled and intercritically annealed medium-Mn steel, it was found that increasing tempering temperature can alleviate hydrogen embrittlement, leading to enhanced resistance to brittle fracture induced by hydrogen. This improvement is primarily attributed to the microstructural evolution of retained austenite and cementite during the tempering process.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Materials Science, Multidisciplinary
Yuxuan Liu, Zuoheng Cao, Chengpeng Huang, Chen Hu, Mingxin Huang
Summary: This study investigates the issue of hydrogen embrittlement caused by fresh martensite in medium Mn steel and proposes an elongated, banded morphology to mitigate hydrogen embrittlement. Comparatively, the elongated grain or phase boundaries in the proposed morphology design can effectively impede the propagation of hydrogen-induced cracks, leading to improved resistance to hydrogen embrittlement.
SCIENCE CHINA-MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Minjeong Kim, Ahjeong Lyu, Hyun-Bin Jeong, Jin-Young Lee, Young-Kook Lee
Summary: In this study, the hydrogen embrittlement (HE) of martensitic medium-Mn steels with varying levels of S and Ti contents was investigated. It was found that the specimens with S or S-Ti additions exhibited higher HE resistance compared to the S-free specimens due to the presence of fine MnS or Ti(C,N) MnS complex inclusions. However, the presence of coarse elongated inclusions was found to be detrimental to HE resistance. Therefore, the key to improving the HE resistance of martensitic medium-Mn steel lies in the distribution of a large volume fraction of fine MnS or Ti(C,N) MnS complex inclusions without coarse elongated ones.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Nanoscience & Nanotechnology
Tao Wang, Xueyang Fang, Wenjie Lv, Huiyun Zhang, Yi Luo, Liuwei Zheng, Wei Liang
Summary: This study characterizes the change of fracture morphology and microstructure of hot-rolled AISI430 ferritic stainless steels (FSSs) specimens after traditional electrochemical hydrogen charging and annealing at different temperatures (720 degrees C-1060 degrees C) using scanning electron microscopy (SEM) and electron backscatter diffraction (EBSD) technology. The influence of annealing temperature on hydrogen embrittlement sensitivity, hydrogen-induced mechanical property changes, and the transformation of microstructure on hydrogen-induced fracture mode were systematically illustrated. The results show that the hydrogen embrittlement susceptibility of FSSs increases significantly from the alpha single-phase region to the alpha+beta dual-phase region. The presence of intergranular carbides in the annealed specimens in the alpha single-phase region leads to high plasticity and improved yield strength after hydrogen charging, attributed to the change of the strain field around the intergranular carbide by hydrogen. The formation of crack holes in the annealed specimens in the alpha single-phase zone and the formation of quasi-cleavage (QC) + cleavage fracture (C) morphology in the annealed specimens in alpha+beta dual-phase zone are the result of the synergistic effect of hydrogen enhanced localized plasticity (HELP) and hydrogen enhanced decohesion (HEDE) mechanisms. Transgranular secondary cracks were observed near the fracture of the annealed specimen when the annealing temperature reached 940 degrees C.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Nanoscience & Nanotechnology
Chang Tian, Hui Guo, Bin Hu, Masato Enomoto, Chengjia Shang
Summary: The microstructure evolution and mechanical properties of medium Mn steel after intercritical annealing and tempering were studied. The presence of a nano-scale concentration gradient layer of Mn and Ni after tempering delayed the TRIP effect in the initial stage of deformation and significantly increased the ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Nu -Ri Cho, Jae-Hoon Nam, Jin-Young Lee, Young-Kook Lee
Summary: In this study, the influence of austenitizing condition on H absorption and hydrogen embrittlement in Zn-Al coated medium-Mn steel was investigated. The specimen austenitized at 750℃ for 5 minutes showed high resistance to hydrogen embrittlement due to its low diffusible hydrogen content. The presence of a uniform Al2O3 oxide layer and a low hydrogen diffusion rate contributed to the low hydrogen content. However, an increase in austenitizing temperature accelerated hydrogen absorption, resulting in decreased resistance to hydrogen embrittlement.
Article
Materials Science, Multidisciplinary
Ehsan Norouzi, Reza Miresmaeili, Hamid Reza Shahverdi, Mohsen Askari-Paykani, Laura Maria Vergani
Summary: The study investigated the effect of plastic deformations on the hydrogen embrittlement of TRIP steel. In situ tensile tests revealed that the total elongation loss increased by 36.8% with increasing hydrogen current density. EBSD observation showed that hydrogen charging decreased stacking fault energy, leading to the formation of more a0-martensite. The formation of a0-martensite and increased dislocation density resulted in the reversible trap sites.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Metallurgy & Metallurgical Engineering
Sang-Gyu Kim, Young-Chul Yoon, Seok-Woo Ko, Byoungchul Hwang
Summary: This research investigates the effect of pre-strain on the hydrogen embrittlement behavior of intercritically annealed medium-Mn steels. The presence of a higher fraction of retained austenite leads to higher hydrogen embrittlement resistance. However, increased pre-strain results in a notable decrease in hydrogen embrittlement resistance due to increased dislocation density and strain-induced martensite transformation.
ARCHIVES OF METALLURGY AND MATERIALS
(2022)
Article
Metallurgy & Metallurgical Engineering
Ying Dong, Min Qi, Yu Du, Hongyan Wu, Xiuhua Gao, Linxiu Du
Summary: The effect of retained austenite stability on the yield point elongation phenomenon in a hot-rolled and intercritically annealed medium-Mn steel is investigated. It is found that the suppression of shear phase transition and the acceleration of intercritical austenite nucleation and growth contribute to refined martensite laths with high dislocation density. The occurrence of yield point elongation is attributed to the storage and transfer of stress in the retained austenite with higher stability.
STEEL RESEARCH INTERNATIONAL
(2022)
Article
Chemistry, Physical
L. Y. Mao, Z. A. Luo, C. Huang, X. M. Zhang
Summary: In this study, the susceptibility to hydrogen embrittlement in HR183 steel and 316L steel was investigated. It was found that despite the lower nickel content, HR183 steel had stronger austenite stability due to the inhibition of martensitic transformation by the addition of manganese and nitrogen. Furthermore, the diffusion of hydrogen was delayed in HR183 steel due to the interstitial solution of nitrogen atoms and the uniform dislocation slips, resulting in a slower permeation and a thinner brittle fracture layer compared to 316L steel. The hydrogen embrittlement susceptibility of HR183 steel was 3.4 times lower than that of 316L steel, attributed to the multiple directions of slip in HR183 steel suppressing strain localization and delaying the adverse effects caused by hydrogen-enhanced mechanisms.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Nanoscience & Nanotechnology
Young-Chul Yoon, Sang-In Lee, Dong-Kyu Oh, Byoungchul Hwang
Summary: This study discusses the correlation between microstructure and low-temperature toughness in intercritically annealed medium-Mn steels with varying Al, Cu, and Ni contents. It is found that the addition of Al can effectively suppress intergranular cracking and improve impact toughness through the formation of a nano-laminated structure. The presence of a nano-laminated structure is suggested to have a beneficial effect on low-temperature toughness by eliminating Mn segregation at the grain boundaries.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Adam Skowronek, Adam Grajcar, Carlos Garcia-Mateo, Jose A. Jimenez, Roumen H. Petrov
Summary: The present study explores the possibility of using continuous annealing approach in Al-alloyed 5Mn steel to optimize the superior mechanical properties in medium-Mn. The microstructural changes as a function of time were followed by dilatometric studies at 680 oC with different soaking times, and thoroughly characterized using various techniques. It was observed that with increasing soaking times, the volume fraction of retained austenite gradually increases, but at the cost of its stability. Mechanical tests results showed a decrease in yield stress, tensile strength and hardness with increasing intercritical annealing soaking time.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2023)
Article
Materials Science, Multidisciplinary
Sudipta Mohapatra, Debajyoti Palai, Bangmaya Satpathy, Siddhartha Das, Karabi Das
Summary: The electrochemical behavior of intercritically annealed Fe-0.18 C-7Mn-4Al steel was investigated. The presence of various microstructures, such as elongated ferrite, reverted austenite, intercritical ferrite, and lath martensite, were observed through SEM, XRD, and EBSD analyses. Corrosion products including Fe, Fe(OH)2, and Fe3O4 were formed after the static immersion test. A micro-galvanic corrosion mechanism, with ferrite acting as the cathode and reverted austenite as the anode, was identified. The sample annealed at 800 degrees C displayed the highest corrosion resistance.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Juanping Xu, Zheng Wang, Hao Fu, Jinxu Li, Ming Wu
Summary: Three types of medium-Mn steels were prepared using different processing methods, with WR1-CA showing the lowest hydrogen embrittlement susceptibility. This study presents a convenient strategy for improving the hydrogen embrittlement resistance of medium-Mn steels.
Article
Materials Science, Multidisciplinary
Haijun Pan, Wangwang Yu, Chaofan Wei, Jinsong Zhang, Jun Li, Gang Wei, Xinyu Li, Bo Qiao, Lin Liu, Zhihui Cai, Zhiqiang Wu
Summary: The hydrogen embrittlement (HE) resistance of a novel Nb-Mo bearing medium Mn steel treated at different quenching temperatures was investigated. It was found that decreasing the quenching temperature increased the mechanical stability of the retained austenite, thus improving the HE resistance of the experimental steel.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2023)
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.