Article
Materials Science, Multidisciplinary
Kyungmin Noh, Seyed Amir Arsalan Shams, Wooyeol Kim, Jae Nam Kim, Chong Soo Lee
Summary: The study aimed to analyze the effects of microstructure on the resistance of low-carbon steels to low-cycle fatigue and extremely low-cycle fatigue (ELCF). Different microstructures showed different fatigue resistance properties, with ferrite-pearlite performing best in ELCF resistance and ferrite-bainite-martensite exhibiting higher ELCF resistance when considering tensile strength.
METALS AND MATERIALS INTERNATIONAL
(2021)
Article
Multidisciplinary Sciences
Deniz Iren, Marc Ackermann, Julian Gorfer, Gaurav Pujar, Sebastian Wesselmecking, Ulrich Krupp, Stefano Bromuri
Summary: Studying steel microstructures is crucial for understanding its mechanical characteristics, but identifying and differentiating complex structures like MA islands in bainitic steel can be challenging. The dataset provided includes a large amount of high-quality data for training machine learning models.
Article
Nanoscience & Nanotechnology
Xiaolu Gui, Guhui Gao, Baifeng An, R. D. K. Misra, Bingzhe Bai
Summary: The study investigated the effects of inclusion size and microstructural features on HCF/VHCF in a B/M steel. It was found that fatigue crack initiation was mainly influenced by inclusions, with the majority of fatigue life consumed by the crack initiation process regardless of the source of the crack. The ratio of fatigue crack initiation life to total fatigue life exhibited a wide scatter due to variations in the B/M hierarchical structure within individual prior austenite grains when cracks initiated from sub-surface microstructure.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Yusong Fan, Xiaolu Gui, Miao Liu, Xi Wang, Chun Feng, Guhui Gao
Summary: The study focuses on the high-cycle fatigue behaviors of medium-carbon bainitic steels. Two crack initiation modes, inclusion-induced crack initiation (IICI) and noninclusion-induced crack initiation (NIICI), were identified after fatigue failure. Predictions of fatigue strength and life were made based on fracture surface analysis.
Article
Materials Science, Multidisciplinary
Meiying Li, Shun Wang, Tao Jia, Xianming Zhao
Summary: The mixed structure of lath bainite and martensite was successfully obtained in ultra-high-strength steel through isothermal transformation tests. The interweaving mode of lath bainite and martensite was revealed through colored metallography and band contrast analysis. Crystallographic characteristics were analyzed in terms of variant pairing, finding different variant pairs in regions with different band contrast values.
Article
Materials Science, Multidisciplinary
Ajit Kumar Pramanick, Hrishikesh Das, Ji-Woo Lee, Yeyoung Jung, Hoon-Hwe Cho, Sung-Tae Hong, Mahadev Shome, Akshay Kumar Pramanick
Summary: Microstructural analysis based on texture patterns was conducted on laser-welded similar and dissimilar ultra-high-strength dual-phase (DP) and complex-phase (CP) steel joints. EBSD analysis revealed that the high-cycle fatigue performances of similar and dissimilar joints were nearly identical.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
G. Sahoo, P. Kumar, K. Nageswaran, K. K. Singh, V Kumar, S. K. Dhua
Summary: The study investigated the impact of Si on martensitic steels, showing its potential as a cheaper alternative to Ni for improving toughness in steel. Laboratory experiments and industrial production resulted in achieving the desired microstructures and mechanical properties of the steel.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
Xiaohui Lu, Zhihao Yang, Dongsheng Qian, Jian Lan, Lin Hua
Summary: The effect of martensite pre-quenching on the bainite transformation kinetics of GCr15 bearing steel was investigated through dilatometry. The results showed that pre-quenched martensite accelerates the nucleation of subsequent bainite transformation and has advantages in transformation rate and mechanical properties compared to direct bainite austempering.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Avanish Kumar, B. Blessto, Aparna Singh
Summary: This study investigated the effect of three different austempering temperatures on the high cycle fatigue behavior of carbide-free nanostructured bainite. Lower austempering temperature led to increased yield strength, while NB350 showed significant strain hardening due to transformation induced plasticity, resulting in longer fatigue life compared to NB250 and NB300.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Shima Pashangeh, Seyyed Sadegh Ghasemi Banadkouki, Fatemeh Besharati, Fatemeh Mehrabi, Mahesh Somani, Jukka Komi
Summary: Fresh attempts were made to identify and estimate phase constituents in a high-silicon, medium carbon multiphase steel through color metallography using various etching techniques. The complex microstructures comprising a mixture of bainite, martensite, and retained austenite were selectively stained, with good contrasting resolution observed via light optical microscopy. Different etching techniques were required to differentiate between the various phase constituents, with the quadruple-step etching technique showing the best contrast and agreement in estimating the volume fraction of retained austenite.
Article
Materials Science, Multidisciplinary
Marc Ackermann, Deniz Iren, Sebastian Wesselmecking, Deekshith Shetty, Ulrich Krupp
Summary: This study utilized deep learning to quantify the martensite-austenite (M-A) islands in bainite. The research found that the ratio of constituent to image size during data pre-processing is a crucial parameter affecting the accuracy of subsequently trained models.
MATERIALS CHARACTERIZATION
(2022)
Article
Engineering, Mechanical
Hitarth Maharaja, Bimal Das, Amit Singh, Sushil Mishra
Summary: In this study, the strain-controlled low cycle fatigue (LCF) behavior of SS 316L at room temperature and -80℃ was investigated. It was found that the specimens at -80℃ exhibited initial cyclic softening followed by hardening due to strain-induced martensitic transformation (SIMT), resulting in an increase in fatigue life.
INTERNATIONAL JOURNAL OF FATIGUE
(2023)
Article
Chemistry, Physical
Zhuohan Cao, Qian Liu, Qianchu Liu, Xiaobo Yu, Jamie J. Kruzic, Xiaopeng Li
Summary: This study develops a machine learning-based approach using image data to predict and reconstruct the microstructural features of LPBF fabricated Ti-6Al-4V alloy. The results show that the proposed method can accurately predict the microstructural features under different process parameters, offering potential applications in process optimization and material design in additive manufacturing.
NPJ COMPUTATIONAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Dingbo Sun, Hui Wang, Xuguang An, Gaixia Wang, Shuhai Huang, Xuefei Huang
Summary: In this study, the quantitative contribution of carbide-free bainite (CFB), lath martensite (LM) and retained austenite (RA) to the mechanical properties was evaluated. The increase of bainite content and decrease of martensite content lead to a decrease in yield strength and impact toughness, while an increase in elongation. The increasing content of CFB and decreasing content of LM mainly contribute to the observed changes in yield strength, elongation, and impact toughness.
MATERIALS CHARACTERIZATION
(2023)
Article
Engineering, Mechanical
C. L. Zou, J. C. Pang, Y. Qiu, R. Liu, S. X. Li, G. X. Jing, C. G. Xu, Z. F. Zhang
Summary: This study investigated the tensile properties, high-cycle fatigue (HCF) properties, and corresponding fatigue fracture mechanism of compacted graphite iron (CGI). It was found that the tensile strength, yield strength, and fatigue strength of CGI decrease with increasing temperature. Fatigue cracks in CGI at 25 degrees C primarily result from local cleavage fracture in the ferrite around the tip of the vermicular graphite. At 400 degrees C and 500 degrees C, the gradual occurrence of grain boundary softening and oxidation may reduce the difficulty of fatigue crack propagation. The change in microstructure content also significantly affects the fatigue properties of CGI. Based on the analysis of fatigue fracture morphology, fatigue crack initiation in CGI mainly depends on damage localization caused by ferrite and vermicular graphite within the graphite cluster, as well as pearlite and spheroidal graphite outside the graphite cluster under cyclic loading. A fatigue strength prediction model associating tensile strength, yield strength, and microstructure area percentage was proposed, which provides a reasonable prediction of HCF strength of CGI at different temperatures.
INTERNATIONAL JOURNAL OF FATIGUE
(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)