Article
Nanoscience & Nanotechnology
Ceyhun Kose
Summary: In this study, AISI 317L austenitic stainless steel sheets were welded using laser beam welding method and post-welding heat treatment (PWHT) was applied to the joints. The effect of PWHT and welding heat input on texture, microstructure, and mechanical properties was examined. It was found that the microstructure of the weld metal consisted largely of austenite and a small amount of ferrite grains for samples welded with both low and high heat input. Mechanical properties were directly affected by these microstructural changes. With the exception of impact notch results, higher tensile strength and micro-hardness were observed for most welded joints compared to the base metal, regardless of heat treatment. Bending strength decreased after heat treatment due to softening of the microstructure. Samples welded with low heat input had high mechanical properties due to finer grain microstructure. Austenite volume ratio increased with PWHT. The orientation of austenite grains in the weld metal was mainly in the [111] and [100] directions. Generally, K-S and N-W orientation relationship (OR) were observed in the samples. In the weld metal of one sample, spinodal decomposition of ferrite was observed under transmission electron microscopy (TEM), but G-phase was not observed.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Timon Suckow, Stephan Volkers, Ezgi Butev Ocal, Markus Grass, Stefan Bohm, Peter Groche
Summary: The present study provides an overview of previous studies on the welding of AA7075-T6 aluminum alloy and investigates the influence of short-time solution annealing on the mechanical properties of the weld. The results show that a short solution annealing time significantly increases weld strength, and the cooling rate after solution heat treatment affects the formation of precipitates in the microstructure of the welded alloy.
Article
Materials Science, Multidisciplinary
Qidong Nie, Xiang Wang, Sheng Wang, Ningxing Li, Xinlin Li, Jiaxin Li, Qiyuan Yu
Summary: The study investigated the microstructural evolution and properties of the rotary friction welding joint of 1MnCrMoNi maraging steel after post-weld heat treatment. It was found that the microhardness in the weld zone was unevenly distributed, increasing closer to the weld center.
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
(2021)
Article
Nanoscience & Nanotechnology
Waris Nawaz Khan, Rahul Chhibber
Summary: This experimental work investigates the effect of filler metal on the dissimilar weld between super duplex stainless 2507 and high strength low alloy API X70 steel. It was found that 309L filler produces skeletal ferrite morphology in the weld, while 2594 filler solidifies with precipitation of multiple reformed austenites in the ferrite matrix. Additionally, 309L filler weld exhibits superior mechanical properties, while 2594 filler provides better pitting corrosion resistance due to high chromium concentration in the weld zone.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Y. Tao, Z. Zhang, P. Xue, D. R. Ni, B. L. Xiao, Z. Y. Ma
Summary: Friction stir welding (FSW) of 2198-T8 Al-Li alloys was conducted under both air cooling and water cooling conditions. Results showed that under air cooling condition, the heat affected zone had the lowest hardness and post weld artificial aging improved the joint hardness, while water cooling had little effect on hardness and joint strength.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Theano N. Examilioti, Nikolai Kashaev, Volker Ventzke, Benjamin Klusemann, Nikolaos D. Alexopoulos
Summary: The mechanical behavior of autogenously and non-autogenously laser beam-welded joints of Al-Cu-Li alloy AA2198 was studied in this research, showing a decrease in yield stress and ultimate strength in the as-welded condition. The addition of AA4047 filler wire altered the Si and Cu content in the grain interior and boundaries of the fusion zone. Furthermore, it was found that non-autogenously welded joints demonstrated a higher quality index in terms of mechanical performance.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Jorge C. F. Jorge, Luis Felipe G. de Souza, Humberto N. Farneze, Cilene L. A. Silva, Matheus C. Mendes, Joao V. S. Matias, Leonardo S. Araujo, Sergio S. M. Tavares
Summary: Superaustenitic stainless steels are widely used in industry for their strength, weldability, and corrosion resistance. However, the behavior of superaustenitic stainless steel weld metals is not well understood, limiting their use in certain welding applications. This study shows that post-weld heat treatment can significantly change the microstructure and corrosion properties of weld metals deposited by the GMAW process. The presence of sigma-phase along the grain boundaries is the main cause for the decrease in corrosion resistance.
Article
Automation & Control Systems
Ahmed Kellai, Sami Kahla, Said Dehimi, Liamine Kaba, Zoheir Boutaghou
Summary: This study investigates the microstructural evolution and mechanical properties of 304 austenitic stainless steel welds produced by GTAW process after PWHT. The microstructure of the weld metal contains skeletal delta-ferrite, which changes its morphology during heat treatment. The PWHT temperature has little effect on the mechanical properties of the welds, but improves their elongation.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
V Maduraimuthu, P. Vasantharaja, M. Vasudevan, B. S. Panigrahi
Summary: This study investigated the impact of TIG and A-TIG welding processes on the microstructure and mechanical properties of P92 steel weld joints. It was found that A-TIG weld joints exhibit higher tensile strength compared to TIG weld joints, but have decreased Charpy impact toughness due to the formation of ?-ferrite along the fusion interface.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Multidisciplinary
M. P. Prabakaran, G. R. Kannan
Summary: The dissimilar austenitic stainless steel and low carbon steel were welded by CO2 4 kW laser welding without filler metal. The effect of Post Weld Heat-Treatment (PWHT) on microstructure, mechanical properties, phase composition, and Ni and Cr distribution was investigated, with the best results observed at 960 degrees C.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Nanoscience & Nanotechnology
Jianing Wang, Xin Chen, Lifei Yang, Guanchen Zhang
Summary: This study attempts to use a combination of preheat and post-weld aging treatment in the double pulse MIG welding process to produce 6061-T6 aluminum alloy welded sheets with high mechanical properties. The effects of heat treatment parameters on the mechanical properties were studied using response surface methodology, and the optimum heat treatment parameters were determined through multi-objective optimization algorithm. The study also investigated the influence of heat treatment parameters on the microstructural evolution and mechanical properties of welded joints.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Engineering, Manufacturing
Ranjeet Kumar, Anand Varma, Y. Ravi Kumar, Suresh Neelakantan, Jayant Jain
Summary: The study examines the influence of heat treatment modification during post-weld heat treatment on the microstructure and mechanical properties of dissimilar welds of T91 and Super304H. The results show that post-weld normalizing and tempering treatment can achieve a uniform microstructure and significantly improve the mechanical properties.
JOURNAL OF MANUFACTURING PROCESSES
(2022)
Article
Chemistry, Physical
Lechoslaw Tuz, Lukasz Sokolowski, Sebastian Stano
Summary: This article presents the research results on the development of laser beam butt welding technology and post-weld heat treatment process for 17-4 PH stainless steel sheets. The developed technology allows for favorable conditions and appropriate microstructure and hardness in the weld area, fulfilling specific requirements beyond the capabilities of manual welding and other methods. Microstructure analysis using light microscopy was conducted for the welded and post-weld heat treated materials. The applied post-weld heat treatment showed changes in microstructure and mechanical properties, with the presence of martensitic microstructure in all weld areas.
Article
Materials Science, Multidisciplinary
Houqin Wang, Ke Han, Binggang Zhang
Summary: The research investigated the effect of post-weld solution treatment (PWST) on microstructure and mechanical properties of electron beam welded IN738LC joint. It was found that under specific conditions, the heat treatment can improve the comprehensive mechanical performance of the joint.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Nanoscience & Nanotechnology
Ting Chen, Zhanxiang Ling, Min Wang, Liang Kong
Summary: By applying a suitable post-weld tempering pulse, the nugget microstructure of RSWs in Q&P1180 steel can be optimized, resulting in improved mechanical properties, especially in cross-tension and tensile-shear tests. The post-weld tempering treatment optimizes the microstructure of the nugget, reducing hardness and increasing toughness, thereby enhancing the weld's resistance to tension and shear.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(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)