Article
Nanoscience & Nanotechnology
Wei Chen, J. H. Luan, Lianyong Xu, Yongdian Han, Lei Zhao, Ji-Jung Kai, Bo Xiao, Hongyang Jing
Summary: Additively manufactured 15-5 PH stainless steels with reversed nano-scale austenite dispersed in martensitic matrix exhibit enhanced strength-ductility combination and fatigue resistance, attributed to the crack closure effect caused by transformation-induced volume expansion and the transformation-induced plasticity effect.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2022)
Article
Chemistry, Physical
Wen Jiang, Kunyu Zhao
Summary: The effect of Cu on the formation of reversed austenite in super martensitic stainless steel was investigated using X-ray diffraction, transmission electron microscopy, and energy-dispersive spectroscopy. It was found that the steel microstructure consisted of tempered martensite and diffused reversed austenite after quenching and tempering. The volume fraction of reversed austenite was higher in the steel with 3 wt.% of Cu compared to the steel with 1.5 wt.% of Cu. The morphology of reversed austenite also differed between the two steels, with the 1.5Cu steel exhibiting a thin strip shape and the 3Cu steel having a block shape.
Article
Materials Science, Multidisciplinary
Peng Wang, Weiwei Zheng, Xin Dai, Pengcheng Zhang, Yanli Wang
Summary: The microstructure and corrosion properties of super 13Cr martensitic stainless steel processed by different tempering methods were investigated. It was found that the volume fraction of reversed austenite reached a maximum of 13.5 vol.% with two-step tempering. The reversed austenite nucleated and distributed near the boundaries of martensite laths during tempering, and its growth was promoted by the diffusion of Ni, Mn, and C. The presence of reversed austenite, enriched with Ni, Mn, C, and with an ultrafine size, contributed to the improved corrosion resistance of the steel. Potentiodynamic polarization curves and electrochemical impedance spectroscopy confirmed that the two-step tempered specimen exhibited better pitting resistance and a thicker passivation film compared to the other samples. The beneficial effect of reversed austenite on the corrosion properties of the steel was confirmed.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Yonggang Zhao, Zhiyuan Zhu, Xuhang Zhao, Ruichao Tian, Yun Lei, Pengfei Yu, Haoping Peng, Longjun Chen
Summary: The influence of reversed austenite on the pitting behavior of super 13Cr martensitic stainless steel was studied. It was found that reversed austenite had a FCC structure with Ni enrichment after tempering process and there were no Ni-depleted regions adjacent to it. The content of reversed austenite increased with increasing tempering temperature, leading to a decrease in pit depth and the dispersion degree of Kelvin potential distribution. The reversed austenite improved the pitting corrosion resistance by increasing the compactness of the passive film and inhibiting Cl- penetration.
Article
Chemistry, Physical
Peng Wang, Weiwei Zheng, Xinpan Yu, Yanli Wang
Summary: The advantageous implications of the microstructure and volume fraction of reversed austenite for the tensile properties of super 13Cr martensitic stainless steel were investigated. The results showed that increasing the tempering temperature led to a significant increase in the content and volume fraction of reversed austenite, resulting in improved elongation and toughness.
Article
Materials Science, Multidisciplinary
Y. Jiang, X. Zhou, X. Y. Li, K. Lu
Summary: Grain boundary relaxation can stabilize nanograined structures in many FCC metals and alloys, but this mechanism is interfered by deformation-induced martensitic transformation in 304 stainless steels. In this study, gradient FCC nanograined structures were prepared in a 304 stainless steel and triggered GB relaxation was observed in samples with grain sizes below 60 nm. Thermal stability increased with decreasing grain size, contrary to the conventional trend. Martensitic nanograins of the same composition did not exhibit GB relaxation, as their instability temperature was controlled by reverse martensitic transformation.
Article
Engineering, Manufacturing
W. P. Tian, Z. Q. Jin, X. R. Wang, G. M. Xie
Summary: In this study, thin-wall parts of super martensitic stainless steel (SMSS) were fabricated using wire-arc directed energy deposition (DED) with the cold metal transfer technique. The microstructural evolution and mechanical performance improvement mechanism of the additive manufactured SMSS parts were investigated. Through heat treatment, the toughness and plasticity of the parts were improved. The best comprehensive mechanical properties were obtained at a temperature of 550 degrees C.
JOURNAL OF MANUFACTURING PROCESSES
(2023)
Article
Materials Science, Multidisciplinary
Yisi Song, Chuanwei Li, Yu Liao, Jianfeng Gu
Summary: This study investigated the mechanical stability of two types of reversed austenite, film-like and blocky reversed austenite, which were obtained after tempering for different time at 620 degrees C in 16%Cr-5%Ni super martensitic stainless steel. Synchrotron high-energy X-ray diffraction combined with in-situ tensile testing was performed. The results indicate that most of the blocky reversed austenite transformed into martensite early at the elastic stage, while the stress induced martensitic transformation of film-like reversed austenite mainly occurred after yield. The poor mechanical stability of blocky reversed austenite was attributed to the increase in chemical driving force caused by the lower degree of Ni enrichment, the decrease in strain energy due to matrix softening, and the lower interfacial energy due to the smaller specific surface area.
Article
Materials Science, Multidisciplinary
Yonggang Zhao, Wei Liu, Yueming Fan, Tianyi Zhang, Baojun Dong, Longjun Chen, Yabin Wang
Summary: The Ni enriched reversed austenite in tempered steel increases the corrosion film stability, while Mo-rich intermetallic compounds reduce the protective properties of the corrosion film. The quenched steel without Mo-rich intermetallic compounds shows the highest corrosion resistance.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
Yisi Song, Chuanwei Li, Yu Liao, Lizhan Han, Jianfeng Gu
Summary: The effects of tempering temperature on the microstructure evolution and mechanical properties of 16%Cr-5%Ni super martensitic stainless steel were investigated. Reversed austenite was detected when tempered above 500 degrees C, reaching a maximum volume fraction of 17% at 620 degrees C. The enrichment of Ni determined the thermal stability of reversed austenite, and the precipitation of M23C6 carbides promoted the nucleation and growth of reversed austenite.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
C. Sofras, J. Capek, A. Arabi-Hashemi, C. Leinenbach, M. Frost, K. An, R. E. Loge, M. Strobl, E. Polatidis
Summary: This study investigates the manipulation of crystallographic texture in austenitic stainless steels using laser-powder bed fusion (L-PBF) to tailor their deformation behavior. By adjusting laser power and scanning speed, tailored crystallographic textures can be obtained. The influence of crystallographic texture on deformation behavior is demonstrated, and the asymmetry between tension and compression is discussed.
MATERIALS & DESIGN
(2022)
Review
Materials Science, Multidisciplinary
Yajiao Xiao, Xiangyuan Xiong, Guangyan Sun, Mengju Sun, Wenqing Liu
Summary: It was found that martensite, retained austenite and reverted austenite in the 15-5 PH stainless steel alloy contain Cu-rich precipitates with different morphologies and sizes.
MATERIALS CHARACTERIZATION
(2022)
Article
Metallurgy & Metallurgical Engineering
Zihui Guo, Xingyuan Mei, Yu Yan, Yanjing Su
Summary: The novel metastable austenitic stainless steel, 13Cr12Mn, shows excellent mechanical properties and resistance to hydrogen embrittlement, as well as good corrosion resistance in alkaline solutions.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Nanoscience & Nanotechnology
Saadi A. Habib, Steven P. Mates, Fan Zhang, Mark R. Stoudt, James S. Zuback, Olaf Borkiewicz
Summary: This study systematically investigates the influence of different heat treatments on the volume fraction and stability of retained austenite in AM 17-4N SS, and shows that by altering these factors, the DIMT process can be utilized to vary the strength, work hardening, and ductility, enabling its use in various applications.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Materials Science, Multidisciplinary
Shenghua Zhang, Yanning Huang, Yanli Wang
Summary: The presence of reversed austenite can enhance the mechanical properties and corrosion resistance of martensitic stainless steel, particularly improving resistance to pitting corrosion.
MATERIALS AND CORROSION-WERKSTOFFE UND KORROSION
(2022)
Article
Materials Science, Ceramics
Bo Shao, Zhengwen Yang, Jun Li, Jianzhi Yang, Yida Wang, Jianbei Qiu, Zhiguo Song
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2017)
Article
Chemistry, Multidisciplinary
Yida Wang, Zhengwen Yang, Bo Shao, Jianzhi Yang, Jun Li, Jianbei Qiu, Zhiguo Song
Article
Materials Science, Multidisciplinary
Jun Li, Zhengwen Yang, Zhuangzhuang Chai, Jianbei Qiu, Zhiguo Song
OPTICAL MATERIALS EXPRESS
(2017)
Article
Materials Science, Multidisciplinary
Bo Shao, Zhengwen Yang, Jun Li, Jianzhi Yang, Yida Wang, Jianbei Qiu, Zhiguo Song
OPTICAL MATERIALS EXPRESS
(2017)
Article
Chemistry, Applied
Jiarui Li, Jing Hu, Shanshan Li, Jun Li, Jing Liu
CARBOHYDRATE POLYMERS
(2018)
Article
Metallurgy & Metallurgical Engineering
Xin-yang Lu, Zhi-wei Wu, Xiao He, Jun Li, Shao-hong Li, Mao-sheng Yang, Kun-yu Zhao
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2020)
Article
Metallurgy & Metallurgical Engineering
Xiao He, Xin-yang Lu, Zhi-wei Wu, Shao-hong Li, Qi-long Yong, Jian-xiong Liang, Jie Su, Lie-xing Zhou, Jun Li, Kun-yu Zhao
Summary: The microstructure evolution and pitting corrosion resistance of a supermartensitic stainless steel after deep cryogenic treatment were studied. The deep cryogenic treatment refined the martensite laths, promoted carbide precipitation, and caused Si atom segregation at the carbide-martensite interface. With increasing tempering temperature, the pitting corrosion potential decreased, with the lowest value observed at 650 degrees C. This sensitivity was attributed to the precipitation of M23C6 carbides and Si atom segregation.
JOURNAL OF IRON AND STEEL RESEARCH INTERNATIONAL
(2021)
Article
Engineering, Electrical & Electronic
Jun Li, Xiaoxi Wan, Na Li, Shihong Tian, Lei Xu, Jianhua Liu, Shaohua Ju
Summary: Investigation was conducted on the effects of different factors in the wet-chemical reduction method for preparing micron-sized plate-like silver powders. Plate-like silver powders with a certain particle size distribution were successfully prepared. The conductive properties of the silver paste were tested and verified.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Shaohong Li, Han Guo, Junwan Li, Zhimin Li, Jun Li
Summary: The influence of deep cryogenic treatment (DCT) on carbides precipitation and isothermal softening behavior of H13 steel during tempering was investigated. The results showed that DCT and tempering led to the transformation of retained austenite into martensite, resulting in an increase in hardness. The carbon content of martensite decreased after DCT and tempering, indicating the precipitation of more fine carbides. The improvement in properties was mainly attributed to the transformation of retained austenite and precipitation of fine carbides after tempering. Additionally, carbides precipitation and coarsening were identified as the main causes of thermal softening.
MATERIALS SCIENCE AND TECHNOLOGY
(2022)
Article
Metallurgy & Metallurgical Engineering
Xinhong Wei, Xu Zhang, Wenchao He, Jun Li, Junxuan Zhang, Donghui Li, Shaohong Li
Summary: This article focuses on the influence of different heat treatment processes involving deep cryogenic treatment (DCT) on the microstructural evolution of a high Cr-Co-Mo high-temperature-bearing steel. A multiphysical field coupling numerical model is built to investigate the martensitic transformation kinetics during DCT. The results show that DCT significantly improves the hardness and promotes the transformation of retained austenite to martensite at low temperatures.
STEEL RESEARCH INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Jun Li, Na Li, Xiaoxi Wan, Lei Xu, Ayonbala Baral, Guo Chen, Shaohua Ju
Summary: The purpose of this study was to prepare monodispersed plate-shaped silver particles with high density and low radius-thickness ratio through wet-chemical reduction. The combination of sulfuric acid and PVP was found to play an important role in controlling the morphology and particle size distribution of silver particles.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2022)
Article
Materials Science, Multidisciplinary
Mingliang Tang, Junxuan Zhang, Jingsong Yue, Han Guo, Biju Zheng, Jun Li, Liexing Zhou, Shaohong Li
Summary: The microstructure evolution and hot-compressive behaviour of high Cr-Co-Mo bearing steel under different deformation conditions were studied. The results showed that thermal deformation parameters and carbide dissolution have significant effects on rheological properties and microstructure. The flow stress decreases with increasing temperature and decreasing strain rate. The growth of DRX grains is facilitated by the dissolution of carbides, weakening the grain boundary pinning effect. The processing map of high Cr-Co-Mo bearing steel was divided into five regions, with the most suitable processing parameters defined as a temperature range of 1000-1070 degrees C and strain rate range of 0.01-0.003 s(-1).
MATERIALS SCIENCE AND TECHNOLOGY
(2023)
Article
Metallurgy & Metallurgical Engineering
Junxuan Zhang, Mingliang Tang, Jingsong Yue, Han Guo, Jun Li, Hengyong Bu, Mengnie Li, Shaohong Li
Summary: The effects of conventional quenching and QPQ processes on the microstructure, thermal stability, and thermal fatigue of H13 tool steel were studied. The results showed that the QPQ treatment can precipitate smaller and more evenly distributed carbides during tempering, leading to grain refinement and improved impact toughness. The higher activation energy required by the QPQ treatment for long-term tempering is mainly attributed to the coarsening and accumulation of carbides. The statistical analysis of thermal fatigue crack length, crack density, and surface hardness indicated that the improved thermal fatigue performance of the QPQ treatment is mainly due to the uniform distribution of fine carbides and grain refinement, which passivate crack tips and enhance the service life to some extent.
STEEL RESEARCH INTERNATIONAL
(2023)
Article
Chemistry, Physical
Na Li, Jun Li, Xiaoxi Wan, Yifan Niu, Yongwan Gu, Guo Chen, Shaohua Ju
Summary: Micro-size spherical silver particles were prepared by wet-chemical reduction method, and their properties were characterized using SEM, XRD, and laser particle-size analyzer. The results showed that different surfactants can prevent accumulation, control morphology and particle size distribution of silver particles. The pH value also affected the morphology, as the particles changed from polyhedral to spherical shape when the pH was increased from 1 to 3. The optimized synthesis conditions yielded micro-size spherical silver particles with diameter of 5-8 μm. The resistivity of conductive silver paste made from these particles was discussed, and the average resistivity after sintering was measured to be 3.57 x 10(-5) ohm·cm.
Article
Chemistry, Multidisciplinary
Jun Li, Na Li, Xiaoxi Wan, Shihong Tian, Jianhua Liu, Lei Xu, Qin Wang, Shaohua Ju
Summary: Micro-size flake silver powders were prepared through wet-chemical reduction method using a micro-jet reactor. The study found that the addition of dispersant and stabilizer has a significant impact on the morphology and parameters of the silver particles.
GREEN PROCESSING AND SYNTHESIS
(2022)
