Article
Materials Science, Multidisciplinary
Amir Baghdadchi, Vahid A. Hosseini, Leif Karlsson
Summary: This study focused on phase identification and quantification in transformation induced plasticity duplex stainless steel (TDSS) base and weld metal using light optical microscopy (LOM) and electron backscatter diffraction (EBSD) analysis, with a novel methodology introduced for multiphase materials.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2021)
Article
Chemistry, Multidisciplinary
Junaid Ahmed, Ihsan-ul-Haq Toor, Mohamed A. Hussein, Nasser Al-Aqeeli, Mirza M. A. Baig
Summary: Nanostructured ferritic and austenitic stainless steel alloys with different Si contents were developed using mechanical alloying and spark plasma sintering. The addition of Si increased the densification and electrochemical performance of the alloys.
Article
Nanoscience & Nanotechnology
Yong Wang, Zhenhua Wang, Wei Wang, Bingyang Ma
Summary: Increasing the yield strength of 316L(N) stainless steel is crucial for both scientific and commercial purposes. This study investigates the effect of nitrogen content on the yield strength of 316L(N) stainless steel through various tests and analyses. The results show that increasing nitrogen content leads to a significant improvement in yield strength due to factors such as solution strengthening and the presence of deformation structures.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Engineering, Manufacturing
L. Becker, A. Roettger, J. Boes, S. Weber, W. Theisen
Summary: In this work, a novel stainless steel alloy design combining ferritic and austenitic microstructures was developed for PBF-LB/M. By adjusting the alloy composition and heat treatment process, the alloy achieved increased strength, corrosion resistance, and austenite content, showing potential for applications in PBF-LB/M technology.
ADDITIVE MANUFACTURING
(2021)
Article
Nanoscience & Nanotechnology
M. Tikhonova, A. Belyakov, R. Kaibyshev
Summary: The effect of aging at 923 K for up to 3000 hours on an S304H-type austenitic stainless steel was investigated. Aging for 100 hours resulted in the precipitation of M23C6 carbides mainly on the grain boundaries. Further aging led to a fast coarsening of these carbides, forming semi-continuous chains along the grain boundaries. This coarsening reduced the fracture toughness and increased susceptibility to intergranular corrosion. However, the uniformly dispersed NbC carbides and Cu-rich particles were less prone to coarsening under aging. The dispersion strengthening by carbide/nitride particles gradually decreased while that from Cu particles increased during annealing, resulting in a slight increase in tensile strength.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Elham Sharifikolouei, Baran Sarac, Alexandre Micoulet, Reinhard Mager, Moyu Watari-Alvarez, Efi Hadjixenophontos, Zaklina Burghard, Guido Schmitz, Joachim P. Spatz
Summary: The hardness of AISI316-Ti stainless steel has been improved by generating an amorphous-nanocrystalline microstructure. The fully amorphous structure was obtained using a modified melt-spinning technique, and the hardness was characterized using thermal analysis and nanoindentation analysis.
MATERIALS & DESIGN
(2022)
Article
Nanoscience & Nanotechnology
Xiaohong Zhan, Jiahao Zhang, Jianfeng Wang, Leilei Wang, Xiang Li, Yanqiu Zhao
Summary: This paper investigates a beam shaping strategy that combines fiber laser and diode laser in the laser welding of austenitic stainless steel. The effects of diode laser power on microstructures and mechanical properties are studied systematically. The results show that the fiber-diode hybrid heat source can effectively improve the welding process and enhance the mechanical properties and surface quality of the joint.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
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
Materials Science, Multidisciplinary
Shubo Gao, Ruiliang Liu, Rui Huang, Xu Song, Matteo Seita
Summary: Combining directed energy deposition and single point incremental forming processes can produce stainless steel 316L samples with a high density of twin boundaries post-recrystallization, enhancing the alloy's properties. The study explores the influence of various SPIF parameters on recrystallization and demonstrates the production of gradient and sandwich microstructures for improved performance.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Multidisciplinary
Ming Chen, Jiansheng Li, Huabing Liu, Mengmeng Wang, Shilong Xing, Yuantao Zhao
Summary: Heterostructured duplex stainless steel with high strength and high ductility was prepared through heavy cold rolling and annealing processes. The excellent performance was attributed to the microstructural heterogeneity and the partitioning of plastic strain.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Peiheng Qiao, Jinyang Xie, Yong Jiang, Pengjie Tang, Bin Liang, Yilan Lu, Jianming Gong
Summary: This study investigated the mechanical properties and the influence of sigma-phase on 304H austenitic stainless steel. The results showed that the presence of sigma-phase increased the hardness and strength of the material, but decreased its ductility and impact toughness.
Review
Engineering, Mechanical
Alok Gupta, Jaiveer Singh, Rahul Chhibber
Summary: This review paper discusses the microstructure development and mechanical behavior of dissimilar metal welds between ferritic and austenitic steel, as well as their application in nuclear power plants. The welding of dissimilar metals is crucial due to variations in physical characteristics, and this work focuses on the challenges of dissimilar ferritic and austenitic steel welding. Weldability issues, selection of appropriate welding consumables, and the effects of heat treatment on the weld joint are thoroughly explored.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART E-JOURNAL OF PROCESS MECHANICAL ENGINEERING
(2023)
Article
Chemistry, Physical
Xiaogang Li, Junfeng Nie, Xin Wang, Kejian Li, Haiquan Zhang
Summary: The formation and evolution of microstructures at the Ni/Fe interface in dissimilar metal weld were investigated in this study. Layered martensitic structures were observed at the interface after welding and post-weld heat treatment. The study clarified the formation of interfacial martensite layer during welding and discussed its evolution during post-weld heat treatment. The findings showed that the Ni/Fe interface structures consisted of quenched martensite layer and partially mixed zone after welding, and further evolved to a double-layered structure of tempered martensite and quenched martensite during post-weld heat treatment.
Article
Materials Science, Multidisciplinary
Ang Xie, Shenghu Chen, Yang Wu, Haichang Jiang, Lijian Rong
Summary: A Nb-stabilized cast austenitic stainless steel was subjected to homogenization treatments at different temperatures to investigate the influence of microstructure on deformation behavior and mechanical properties. Dissolution of primary NbC at temperatures above 1150 C led to the disruption of network connectivity and an increase in carbon and niobium content in the matrix, resulting in improved ultimate tensile strength and elongation.
MATERIALS CHARACTERIZATION
(2022)
Article
Mechanics
Anssi Laukkanen, Sampo Uusikallio, Matti Lindroos, Tom Andersson, Jukka Komi, David Porter
Summary: Ferritic-austenitic duplex stainless steels are preferred for their good mechanical properties and corrosion resistance, with current research focusing on micro-scale analysis of cleavage fracture behavior to enhance cleavage resistance. Investigations suggest that the fraction and morphology of austenite play a critical role in improving fracture toughness.
ENGINEERING FRACTURE MECHANICS
(2021)
