Article
Materials Science, Multidisciplinary
Mathias Truschner, Robin Kroll, Matthias Eichinger, Andreas Keplinger, Dirk L. Engelberg, Gregor Mori
Summary: The hydrogen uptake and embrittlement characteristics of a cold-drawn austenitic stainless steel wire were investigated. The resistance to hydrogen embrittlement was found to decrease significantly with a 50% degree of cold deformation. The hydrogen content was assessed using thermal desorption and laser-induced breakdown spectroscopy, which established a correlation between the absorbed hydrogen and the intensity of near-surface hydrogen. The sub-surface hydrogen content of the hot-rolled specimen was determined to be 791 wt.ppm.
Article
Chemistry, Physical
Zhengrong Zhou, Kaiyu Zhang, Yuanjian Hong, Haohao Zhu, Wanliang Zhang, Yanmin He, Chengshuang Zhou, Jinyang Zheng, Lin Zhang
Summary: The study revealed that heat treatment of selective laser melted (SLM) 304L stainless steel affects its hydrogen embrittlement susceptibility, with higher temperatures leading to more severe hydrogen embrittlement effects. Dislocations are identified as the main cause of hydrogen embrittlement, and preexisting dislocations can impact hydrogen transport behavior during sample stretching.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Materials Science, Multidisciplinary
Mahdieh Safyari, Masoud Moshtaghi
Summary: The susceptibility of metastable 304L to embrittlement in a high-pressure gaseous hydrogen environment was studied. The deterioration of mechanical properties caused by high pressure hydrogen gas can be accelerated by the presence of surface defects. Varying the machining parameters to change the density of defects caused by machining, it was found that the maximum dislocation density, rather than the maximum strain-induced martensite, increased the sensitivity to hydrogen embrittlement.
Article
Materials Science, Multidisciplinary
Polina Metalnikov, Guy Ben-Hamu, Dan Eliezer
Summary: This study investigates the hydrogen embrittlement of 316L stainless steel produced by laser powder bed fusion through hydrogen trapping. The availability of hydrogen in the material is influenced by its interactions with trapping sites, which affects the material's susceptibility to hydrogen-induced cracking.
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
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
Tao Wang, Huiyun Zhang, Wei Liang
Summary: The effect of electrochemical hydrogen charging on AISI430 ferritic stainless steel was studied through tensile tests. Hydrogen significantly impacted the mechanical properties of the material, reducing elongation, increasing yield strength, and increasing tensile strength. The increase in tensile strength was attributed to hydrogen-induced dislocations pinning and the influence of carbide particles on dislocation glide. The softening effect of hydrogen was observed with increasing outgassing time. The HEDE mechanism played a key role in crack nucleation and the generation of cleavage regions in the material.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Yi Luo, Wei Li, Laizhu Jiang, Ning Zhong, Xuejun Jin
Summary: The susceptibility to hydrogen embrittlement and diffusion behavior of different steel types were evaluated, showing that QN1803 had higher austenite stability but increased hydrogen content due to small grain size and low activation energy, leading to microcrack formation.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Article
Chemistry, Physical
A. Dreano, M. Alnajjar, F. Salvatore, J. Rech, C. Bosch, K. Wolski, G. Kermouche, F. Christien
Summary: Slow strain rate tensile tests were conducted on 17-4 PH steel with two surface conditions: mirror polished and ball-burnished, under hydrogen cathodic charging. Subcritical cracking initiating at the surface was observed in both cases, leading to a considerable reduction in elongation to fracture. However, the ball-burnished specimens showed better elongation and less secondary cracking compared to the polished ones. Ball-burnishing introduced high compressive residual stresses in the sub-surface of the specimens, which delayed crack initiation and improved resistance to hydrogen assisted cracking. The microstructure was minimally affected by ball-burnishing, indicating little impact on hydrogen trapping.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2022)
Article
Materials Science, Multidisciplinary
Qian Yan, Luchun Yan, Xiaolu Pang, Kewei Gao
Summary: This study investigated the influence of Cu precipitations on hydrogen trapping capability and hydrogen embrittlement (HE) in aged martensitic stainless steel. The results showed a significant decrease in the hydrogen diffusion coefficient and a substantial increase in the hydrogen content in specimens containing Cu precipitations. The specimens with peak-aged (1 h) Cu precipitations exhibited the highest HE susceptibility, as a result of abundant hydrogen trapped by coherent Cu precipitations with the matrix and escaped during the tensile process.
Article
Materials Science, Multidisciplinary
P. Schutz, L. Latu-Romain, F. Martin, Q. Auzoux, J. Adem, Y. Wouters, B. Ravat, D. Menut
Summary: High strength materials for hydrogen powered mobility, such as 17-4 PH grade stainless steel, are prone to hydrogen embrittlement. This study investigated the role of copper rich precipitates (Cu-pp) and reverted austenite (γrev) on mechanical behavior in presence of hydrogen. The results showed that the formation of tiny Cu-pp during ageing increased the ultimate tensile strength but reduced the hydrogen embrittlement resistance, while a high fraction of reverted austenite softened the material and trapped hydrogen strongly. The fcc (Cu-pp or γrev)/martensitic matrix interfaces played a significant role in hydrogen trapping in 17-4-PH stainless steel.
MATERIALS CHARACTERIZATION
(2023)
Article
Metallurgy & Metallurgical Engineering
Afshin Yousefi, Goroh Itoh, Zoha Ghorani, Shigeru Kuramoto
Summary: The tensile properties of a duplex stainless steel with and without hydrogen plasma charging were investigated at different strain rates. It was found that the ultimate tensile strength and elongation to failure decreased with increasing charging time, but the effect on tensile strength was less significant. The extent of hydrogen embrittlement reached a maximum at a strain rate of 1.38 x 10(-6) s(-1) and was consistent with previous findings using electrolytically charged hydrogen. However, the strain rate at which degradation was maximized in the current tests was significantly lower than in the electrolytically charged specimens, suggesting that the trapping site for plasma-charged hydrogen is more stable.
ISIJ INTERNATIONAL
(2023)
Article
Materials Science, Multidisciplinary
Cem Ornek, Bilgehan M. Sesen, Mustafa K. Urgen
Summary: This paper investigates the mechanism of hydrogen-microstructure-strain interactions in a finely-grained 25Cr-7Ni super duplex stainless steel subjected to dynamic tensile loading. It reveals that hydrogen affects the properties of austenite and ferrite, leading to the occurrence of hydrogen-induced cracks, with the hydrogen absorption capacity of austenite playing a decisive role in hydrogen embrittlement susceptibility.
METALS AND MATERIALS INTERNATIONAL
(2022)
Article
Nanoscience & Nanotechnology
Hong Luo, Bo Zhao, Zhimin Pan, Yu Fu, Xiaogang Li
Summary: The study observed the influence of hydrogen on high-entropy alloys, finding that the microstructure evolution, mechanical properties, and embrittlement behavior of the alloy are affected by hydrogen exposure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Tao Wang, Wenjie Lv, Wentao Xiao, Kun Wang, Huiyun Zhang, Wei Liang
Summary: This study investigated the influence of hot rolling and annealing processes on the hydrogen embrittlement sensitivity of ferritic stainless steel, as well as the changes in hydrogen-induced fracture modes. Results showed that hot-rolled specimens had the highest hydrogen embrittlement sensitivity and strength, while annealed specimens exhibited increased strength after heat treatment. Different processing methods also resulted in different hydrogen-induced fracture modes.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2022)
Article
Engineering, Mechanical
Halid Can Yildirim, Heikki Remes, Alain Nussbaumer
INTERNATIONAL JOURNAL OF FATIGUE
(2020)
Article
Mechanics
Jani Romanoff, Jasmin Jelovica, J. N. Reddy, Heikki Remes
Summary: The paper investigates the post-buckling response of web-core sandwich plates through classical continuum mechanics assumptions and Equivalent Single Layer (ESL) plate formulation. The effect of finite size of the periodic microstructure is observed to barely influence the plate responses during the initial membrane-dominated loading stages, but activates secondary shear-induced bending moments at higher loads. The findings are validated with shell element models of the actual 3D-geometry, and the physical limits of classical continuum mechanics are discussed.
Article
Materials Science, Multidisciplinary
Jairan Nafar Dastgerdi, Fariborz Sheibanian, Heikki Remes, Hossein Hosseini Toudeshky
Summary: This study investigates the effect of peak load on micro-crack formation in high-strength steel, finding that surface roughness has a greater influence on micro-crack formation than residual stress, and the crack size increases exponentially with increasing peak load magnitudes.
Article
Engineering, Mechanical
Matti Rautiainen, Heikki Remes, Ari Niemela
Summary: The new TFA approach accurately defines the local weld stress and reduces scatter range index compared to conventional shell element models. It is more efficient due to lower pre- and post-processing efforts.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2021)
Article
Engineering, Marine
Eero Avi, Aleksi Laakso, Jani Romanoff, Heikki Remes, Ingrit Lillemae-Avi
Summary: This paper presents a practical procedure for creating finite element model for vibration analysis of cruise ships. The most suitable FE modelling approaches and mesh density for global hull girder modes and higher frequency response are discussed through case studies of common ship structures. The ESL-theory based element can be extended up to about two thirds of the local plate natural frequency with an applied correction method.
Article
Materials Science, Multidisciplinary
Eric Fangnon, Yuriy Yagodzinskyy, Evgenii Malictki, Saara Mehtonen, Esa Virolainen, Pedro Vilaca
Summary: The study found that at critical hydrogen concentrations, the tensile strength of the steel significantly decreased, but no further strength degradation was observed above this concentration. The interplay between hydrogen concentrations and stress states, along with the presence of total average hydrogen reduced the general plasticity of the specimen, leading to the observed strength degradation.
Article
Engineering, Civil
Federica Mancini, Heikki Remes, Jani Romanoff, Pasquale Gallo
Summary: This study introduces an analytical beam model to improve the analysis of welded thin plates with induced distortions, considering the effect of butt-welded joint rigidity on plate bending and structural stress. The fixity factor is developed to enhance the analytical solution, showing a 9% improvement in evaluating hot-spot structural stress.
ENGINEERING STRUCTURES
(2021)
Article
Materials Science, Multidisciplinary
Aleksi Laakso, Jani Romanoff, Ari Niemela, Heikki Remes, Eero Avi
Summary: This study combines Finite Element Method and analytical calculations to analyze the free vibration of interacting length-scales of 3D-thin-walled structures. By using equivalent single layer elements with homogenized mass and stiffness, the computational cost is significantly reduced while achieving excellent accuracy in natural vibration modes.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Metallurgy & Metallurgical Engineering
Pauli Lehto, Heikki Remes
Summary: Microstructural characterisation plays a crucial role in understanding the relationship between microstructure and mechanical properties in engineering materials. This paper introduces an EBSD-based linear intercept measurement method for spatial grain size variation in ferritic steel weld metals, providing a more flexible and robust analysis. The study also explores the formation of grain sub-structures induced by the solidification of the weld pool and their impact on mechanical properties. Results indicate that there is a Hall-Petch-type relationship between hardness and average dislocation cell size, partially correcting the different grain size-hardness relationship observed in ferritic and bainitic/martensitic weld metals.
WELDING IN THE WORLD
(2022)
Article
Engineering, Marine
Alice Petry, Pasquale Gallo, Heikki Remes, Ari Niemela
Summary: This study investigates the optimization of the Voce-Chaboche (V-C) material model parameters for high-strength steel welded joints under cyclic loading. The model parameters for each material zone in a S690 steel butt-welded joint were determined using a Newton trust region (NTR) method-based optimization algorithm and an accumulated true strain parameter. The model was validated through fully-reversed variable amplitude fatigue experiments and compared against numerical results from finite element analysis. The results demonstrate the successful determination of the V-C model parameters for different material zones in the welded joint and accurate estimation of the strain range and fatigue life for variable amplitude load histories.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Jairan Nafar Dastgerdi, Omid Jaberi, Heikki Remes
Summary: This paper introduces a new method for characterizing additive manufactured stainless steel samples using XCT, which provides holistic information and predicts fatigue life and failure origins.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Mechanical
P. Gallo, P. Lehto, E. Malitckii, H. Remes
Summary: This study investigates the microstructurally small fatigue crack growth rate in body-centred cubic ferritic stainless steel using a novel domain misorientation approach for EBSD microstructural deformation analyses, along with in situ digital imaging correlation. The results show that shear strain localisations occur ahead of the crack tip during propagation and correlate well with the FCG rate retardations. Grain boundaries can be found at both peaks and valleys of the FCG rate curve and affect the interaction between crack growth and shear strain localisations.
INTERNATIONAL JOURNAL OF FATIGUE
(2022)
Article
Engineering, Manufacturing
Jairan Nafar Dastgerdi, Omid Jaberi, Heikki Remes, Pauli Lehto, Hossein Hosseini Toudeshky, Jukka Kuva
Summary: This study aims to clarify the correlation between process-related defects and fatigue performance of AM 316 L stainless steel. X-ray computed tomography (XCT) has been employed to characterize process-related defects' features and their synergistic interaction to define the effective defect size parameter root area(eff), leading to identifying potential sites for fatigue crack initiation before testing. A novel characterization framework is developed for monitoring the fatigue crack initiation and propagation, and a fracture-mechanics based analytical framework is developed for the fatigue life prediction of AM components.
ADDITIVE MANUFACTURING
(2023)
Article
Engineering, Mechanical
Ilari Tillikainen, Pasquale Gallo, Pauli Lehto, Heikki Remes
Summary: The study investigates the relationship between crack growth rate (CGR) and cyclic crack-tip opening displacement (ΔCTOD) of microstructurally small fatigue cracks using high-resolution digital image correlation (DIC). Load-controlled fatigue tests were performed on small-scale specimens of 18%Cr ferritic stainless steel. The findings reveal that the non-linear relationship between CGR and ΔCTOD on a double logarithmic scale is caused by the crack-tip bypassing an inhomogeneous shear strain localization zone. ΔCTOD is not able to characterize the behavior of microstructurally small fatigue cracks within this zone, but remains a valid crack driving force parameter outside it.
FATIGUE & FRACTURE OF ENGINEERING MATERIALS & STRUCTURES
(2023)
Proceedings Paper
Construction & Building Technology
Jani Romanoff, Mihkel Korgesaar, Pauli Lehto, Kennie Berntsson, Heikki Remes
Summary: This paper investigates the structural integrity analysis of ships in collisions and groundings, emphasizing the importance of realistic idealization of environmental and operational conditions within computational models. The experimental results reveal the significant impact of uncertainties in the panels' boundary conditions on the membrane and bending load-carrying mechanisms, as well as loading, material, and structural gradients.
4TH INTERNATIONAL CONFERENCE ON STRUCTURAL INTEGRITY (ICSI 2021)
(2022)
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)
