Article
Materials Science, Multidisciplinary
Yumin Xie, Mingming Song, Bao Wang, Hangyu Zhu, Zhengliang Xue, Alexander Mayerhofer, Susanne Katharina Michelic, Christian Bernhard, Johannes Leopold Schenk
Summary: The size, quantity, morphology, and structure of inclusions in steel treated with rare earth using different deoxidizers were studied. Rare earth tended to refine inclusions and increase their number density in steel. Calcium and titanium, when combined with rare earth, could reduce the number densities and affect the mean diameters and aspect ratios of the inclusions. The automatic analysis system showed better performance in counting the content percentage of inclusions, while manual inclusion statistical analysis was superior for determining the inclusion number and size in rare earth-containing steel.
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Lei Wang, Bo Song, Zhan-bing Yang, Xiao-kang Cui, Zhen Liu, Wen-sen Cheng, Jing-hong Mao
Summary: The evolution of inclusions and the formation of acicular ferrite in Ca-Ti treated steel after Mg and La addition were systematically investigated. The types of inclusions in the molten steel and final quenched samples were similar, but with differences in morphology, where the La-containing sample had the smallest average inclusion size and highest number density. Additionally, the percentage of acicular ferrite increased due to the increase in effective inclusions in the La-containing sample.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yulong Yang, Xiao Jia, Yaxin Ma, Ping Wang, Fuxian Zhu
Summary: In this study, the evolution and effect of Nb/Ti-containing complex inclusions in Nb/Ti low carbon microalloyed steels were investigated. The results showed that adding Nb had no effect on the grain size, but inhibited the nucleation of acicular ferrite. Additionally, the addition of Nb changed the size, morphology, and composition of nano-level precipitates. These findings provide important theoretical references for studying the welding performance of Nb/Ti low carbon microalloyed steels.
MATERIALS CHARACTERIZATION
(2022)
Article
Nanoscience & Nanotechnology
Xiaonan Qi, Xiaonan Wang, Hongshuang Di, Xinjun Shen, Zhenguang Liu, Pengcheng Huan, Long Chen
Summary: This study investigated the effect of Ti content in laser-MAG hybrid welds on the microstructure, impact toughness, and fracture mechanism. By inducing acicular ferrite (AF) with Ti2O3 in the welds, the impact toughness was improved and cracks were hindered by AF, resulting in a higher impact energy at -40 degrees C compared to the base metal. The presence of a high effective grain boundary density and low kernel average misorientation value of AF effectively hindered crack propagation and improved impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Yinhui Zhang, Jian Yang, Dekun Liu, Xiaoqian Pan, Longyun Xu
Summary: This study investigates the effect of Ca content on TiN particles, microstructure, and impact toughness of HSLA steels, showing that increasing Ca content can enhance the number density of submicron and nano-scale particles, but not the particle size. Among the tested steels, 25Ca steel exhibits finer grains and improved impact toughness due to the refined submicron-scale TiN particles.
METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE
(2021)
Article
Metallurgy & Metallurgical Engineering
Lei Wang, Bo Song, Jinghong Mao, Xiaokang Cui, Zhen Liu, Longfei Li
Summary: This study investigates the effect of Mg content on inclusions and microstructure of Ca-La-treated steel. The results show that Mg content has an impact on the composition and density of inclusions, as well as the formation of acicular ferrite (AF).
STEEL RESEARCH INTERNATIONAL
(2022)
Article
Metallurgy & Metallurgical Engineering
Zhen Liu, Bo Song, Jinghong Mao
Summary: Research on Ti-Mg-Ca killed EH36 steel found that the addition of calcium promoted the precipitation of MnS on inclusions, which in turn facilitated the formation of acicular ferrite. However, a high calcium content led to an increase in CaS content in inclusions, reducing the probability of acicular ferrite nucleation on them.
IRONMAKING & STEELMAKING
(2021)
Article
Metallurgy & Metallurgical Engineering
Lei Wang, Bo Song, Jinghong Mao, Xiaokang Cui, Zhen Liu
Summary: The study found that the addition sequence of Mg, La, and Ca affects the characteristics of inclusions and the formation of acicular ferrite in steel, with the highest proportion of effective inclusions and more AF formation observed when Mg was added first.
IRONMAKING & STEELMAKING
(2022)
Article
Nanoscience & Nanotechnology
Hyo-Seong Kim, Myeongji Jo, Jeong Yeol Park, Byung Jun Kim, Hyoung Chan Kim, Daegeun Nam, Byoungkoo Kim, Yong-sik Ahn
Summary: This study investigates the microstructure and mechanical properties of high-speed railway brake disc steel materials with different titanium (Ti) contents. It is found that a Ti content of 0.06 wt% leads to the highest hardness, impact toughness, and strength. The effect of acicular ferrite and precipitates on the toughness of ferrite casting steel is confirmed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Metallurgy & Metallurgical Engineering
A. Elramady, E. Sullivan, K. Sham, L. O'Brien, S. Liu
Summary: The study compares the characterization of microstructures in high-strength low-alloy steel weld metal using LOM and EBSD, demonstrating that EBSD can accurately distinguish various microstructures.
WELDING IN THE WORLD
(2022)
Article
Materials Science, Multidisciplinary
Fangce Liu, Qi Wang, Jiawang Li, Yandong Liu, Tong He, Guo Yuan
Summary: The study investigated the influence of cooling rate on acicular ferrite (AF) nucleation and growth on Ti-Mg oxide. Results showed that the initial transformation temperature and growth rate of AF vary with different cooling rates, with 2℃/s being the most suitable rate. Ti-Mg-Mn-O inclusions were effective nucleating agents for AF, and AF grains with different orientation relationships with oxides exhibited differences in lattice mismatch and interface properties.
MATERIALS CHARACTERIZATION
(2021)
Article
Metallurgy & Metallurgical Engineering
Kangmyung Seo, Yongjoon Kang, Hee Jin Kim, Joong Geun Yoon
Summary: This study aimed to confirm the formation of TiN phase in the electrogas weld metal and its nucleation potency for acicular ferrite. Inclusions were analyzed using SEM and TEM with EDS and EELS. It was found that the inclusions were covered by TiO layer alloyed with nitrogen and partly coated with two types of TiN phases: layer-type and patch-type. The layer-type was nearly pure TiN and formed a 10 nm thick layer on the outer surface of the TiO layer. The patch-type consisted of a fine lamellar mixture of TiN and (Al,Mn)-oxide.
WELDING IN THE WORLD
(2023)
Article
Chemistry, Physical
Zhongran Shi, Tao Pan, Yu Li, Xiaobing Luo, Feng Chai
Summary: This study investigated the impact of boron on the microstructure and toughness of vanadium microalloyed steel. The results showed that boron contributed to the generation of acicular ferrite, which improved the toughness of the heat-affected zone.
Article
Materials Science, Multidisciplinary
Fangce Liu, Yue Bi, Chao Wang, Jian Kang, Tong He, Yandong Liu, Guo Yuan
Summary: In this paper, high temperature hot rolling and weld simulations were conducted on Al-killed and Ti-Zr-killed steels. The microstructure and impact toughness of the heat-affected zone (HAZ) were investigated, and the ferrite transformation behavior in HAZ was observed. The results showed that the HAZ microstructure of Ti-Zr-killed steel had a refined structure with fine acicular ferrite (AF), while the HAZ microstructure of Al-killed steel consisted of coarse bainite ferrite (BF) and granular bainite (GB). The formation of an interlocked AF structure in the HAZ of Ti-Zr-killed steel improved its impact toughness, while the impact toughness of Al-killed steel decreased significantly after the weld simulation.
METALS AND MATERIALS INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Fangce Liu, Jiawang Li, Qi Wang, Yandong Liu, Yang Bai, Tong He, Guo Yuan
Summary: The study found that Ti-Mg-Mn-O·MnS inclusions in Ti-Mg deoxidized steel effectively promoted the nucleation of AF, resulting in good mechanical properties. Moreover, under high austenitizing temperature conditions, fine AF microstructure was formed in Ti-Mg deoxidized steel, improving low-temperature impact toughness.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(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)