Article
Engineering, Mechanical
L. Cheng, W. Yu, Q. W. Cai, Q. Yang
Summary: The study investigated the high-temperature fatigue mechanism of two 2.2Cr heat resistant steels with different prior austenite grain sizes using a strain-stress cooperative control strategy. It was found that softening of grain boundaries led to a transition in deformation mechanism, and an increase in strain rate at 650 degrees C had opposite effects on peak stress and fatigue life for the two matrixes due to microscopic deformation anisotropy induced by the viscoelasticity of prior austenite grain boundaries.
INTERNATIONAL JOURNAL OF FATIGUE
(2021)
Article
Nanoscience & Nanotechnology
Jun Lu, Hao Yu, Shufeng Yang
Summary: In this study, multi-stage heat treatment is applied to study the microstructural evolution of high-strength low-alloy steel, with a focus on austenite reversion kinetics and mechanical behavior. The introduction of intercritical treatment leads to improved toughness through the formation of globular and acicular grains, enhancing the overall performance of the steel. The study also explores the mechanical properties in terms of microstructural characteristics, including martensite fraction, intercritical ferrite morphology, dislocation interactions, and carbides, which affect the strain hardening behavior and impact toughness of the steel.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Xianguang Zhang, Yingjie Ren, Jian Zhang, Xiaodong Yang, Xin Xie, Huan Liu, Wenchao Yang
Summary: The effects of prior austenite grain size on the reversion kinetics of different crystallographic austenite were studied. It was found that coarse grain size inhibits the reversion kinetics of globular austenite, but has weak influence on the acicular austenite.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Laixin Shi, Lin Xiang, Jianquan Tao, Qiang Chen, Jun Liu, Yong Zhong
Summary: The actual marine atmospheric pre-corrosion behavior and its impact on the fatigue performance of 7075-T73 aluminum alloy were investigated. Results showed that localized pitting, intergranular corrosion, and exfoliation corrosion occurred during the outdoor exposure in a marine atmosphere. The severity of atmospheric corrosion increased with longer exposure time. The average fatigue life of the aluminum alloy specimens decreased dramatically as the exposure time increased, indicating a negative effect of marine atmospheric pre-corrosion on fatigue life.
Article
Materials Science, Multidisciplinary
Kaihao Guo, Zhongran Shi, Tao Pan, Xiaobing Luo, Feng Chai
Summary: The structure of M-A constituents in the coarse-grained heat-affected zone of ultra-low-carbon quenched and tempered plate was investigated. The study found that M-A constituents transformed from full lath-type martensite to mixed M-A constituents with peripheral austenite and twin-type martensite. The interface structures between laths also transformed from lath-type to twin-type martensite as the t(8/5) increased.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Xiang Luo, Guang Xu, Xiaohua Chen, Zidong Wang
Summary: This study used ausforming technique during the simulated process of the coarse-grained heat-affected zone (CGHAZ) to modify the microstructure of the brittle martensite-austenite (M-A) constituents in bainite steel and improve the CGHAZ toughness. The results showed that ausforming contributed to the formation of austenite within the M-A constituents, leading to an improvement in CGHAZ toughness from 10.50 J to 33.70 J.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Multidisciplinary
Arwa Toumi, Chokri Boubahri, Jalel Briki, Haythem Barrek, Ahmed Hichem Hamzewi
Summary: In this study, an experimental investigation was conducted on high-strength low-alloy steel in marine environments, revealing a significant decrease in mechanical properties with increased exposure time to corrosion and rising salinity levels in sea water. Microbial corrosion was also identified as a factor contributing to the degradation of mechanical properties in calm sea water.
JOURNAL OF FAILURE ANALYSIS AND PREVENTION
(2021)
Article
Materials Science, Multidisciplinary
Bhawesh Chhajed, Kushal Mishra, Kritika Singh, Aparna Singh
Summary: Prior austenite grain size (PAGS) has significant influence on the microstructure and mechanical properties of bainitic steels. Larger PAGS leads to decreased thickness of bainitic lath and enhanced tensile properties and fracture toughness.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Wenquan Wang, Zhongfen Yu, Yu Cui, Rui Liu, Li Liu, Shujiang Geng, Fuhui Wang
Summary: The corrosion behavior of Ni-based superalloy GH4169 in the marine environment was investigated through alternate exposure to intermediate temperature salt spraying and the marine atmosphere. The study found that corrosion primarily occurred due to intermediate temperature NaCl spraying, resulting in significant weight gain, while a weight loss was observed in the marine atmosphere. Prolonged exposure led to further corrosion and internal damage in the alloy. Corrosion mainly occurred at the vertices of NaCl particles, leading to the depletion of Cr2O3 and the formation of a complex mixture of Cr2O3, NaCrO2, and Na2CrO4.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Can Peng, Gongwang Cao, Tianzhen Gu, Chuan Wang, Zhenyao Wang, Cheng Sun
Summary: The fluctuation of dry/wet time is crucial to the corrosion process under a thin electrolyte film. This study investigated the influence of dry/wet time ratios on the atmospheric corrosion process of the 6061 Al alloy. Increasing the wetting time promoted intragranular corrosion, resulting in the highest corrosion rate at a constant relative humidity of 90%, which was 0.275 g.m(-2).d(-1). Quasi-in-situ observation revealed that intragranular corrosion was closely related to iron-enriched particles in the matrix. This study also provided theoretical guidance for accelerated simulation tests of Al alloys in the marine atmosphere.
Article
Nanoscience & Nanotechnology
Dileep Chandran Ramachandran, Joonoh Moon, Chang-Hoon Lee, Sung-Dae Kim, Jun-Ho Chung, Elliot Biro, Yeong-Do Park
Summary: The microstructures in CGHAZ, such as acicular ferrite and bainitic ferrite, play a vital role in determining the toughness of the material. A combination of polygonal ferrite, granular bainite, and martensite-austenite constituent can increase the brittleness of the material, while a combination of acicular ferrite and bainitic ferrite can enhance the ductility.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Chuang Qiao, Mingna Wang, Long Hao, Xiahe Liu, Xiaolin Jiang, Xizhong An, Duanyang Li
Summary: The research found that NaCl deposition and temperature have significant effects on the corrosion evolution of SAC305 solder joints, with high NaCl deposition prolonging the corrosion process, high temperature accelerating evaporation and leading to thinner film formation, affecting the formation of corrosion product layer.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Feiyu Zhao, Lucia Morales-Rivas, Qian Yu, Guodong Wang, Francisca G. Caballero, David San-Martin
Summary: The reasons for the limited impact toughness of medium manganese, medium carbon carbide-free bainitic steels are discussed in this paper. Different hot-rolling schedules were used to obtain microstructures with three different prior austenite grain sizes: coarse, medium, and fine grain sizes. The impact toughness of the medium grain size microstructure improved significantly due to the lower ductile-to-brittle transition temperature, compared to the coarse and fine grain size microstructures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Xiucheng Li, Guangyi Lu, Qichen Wang, Jingxiao Zhao, Zhenjia Xie, Raja Devesh Kumar Misra, Chengjia Shang
Summary: In this study, the effects of prior austenite grain (PAG) refinement on the mechanical properties of bainitic/martensitic steels were investigated. The results show that uniform refinement of PAG can significantly improve the toughness of the material, while its contributions to strength and elongation are relatively limited. When the PAGs are mixed crystal, the positive effects of microstructure refinement on toughness improvement are weakened.
Article
Metallurgy & Metallurgical Engineering
Xuan-dong Wang, Nan Li, Hang Su, Hui-min Meng
Summary: Grain size determination is crucial for the production and testing of iron and steel materials. A new experimental method using Nital etchant instead of toxic and explosive picric acid was developed. By utilizing deep learning and convolutional neural network models, the recognition of prior austenite grain boundaries in etched martensite microstructure was achieved, resulting in automatic determination or reference for grain size rating with an accuracy rate of 87.53%.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2023)
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)