Phase Characterization and Formation Behavior in 6 wt% Si High-silicon Austenitic Stainless Steel during Isothermal Aging
来源期刊：Acta Metallurgica Sinica2021年第5期
论文作者：Sihan Chen Tian Liang Yangtao Zhou Weiwei Xing Chengwu Zheng Yingche Ma Jin Ming Wu Kui Liu
文章页码：649 - 656
摘 要：The precipitation behavior of different phases in a high-silicon stainless steel （6 wt%Si） during aging at 600–1050℃ for24 h was investigated.The morphology,crystal structure and composition of various precipitates were detailly characterized using optical microscopy,scanning electron microscopy and transmission electron microscopy.Four phases were mainly identified:χ-phase,M6C carbides,σphase and a new type of fcc-phase.During aging at 600–900℃,the main precipitate was（Cr,Mo and Si）-richχ-phase which was directly precipitated fromγmatrix.Theχ-phase was calibrated as bcc structure with a lattice parameter of 8.90?.The peak temperature for the precipitation ofχ-phase was 800℃,and it was dissolved when aging at temperatures above 1000℃.Theσ-phase was observed only at 700℃ and grew next toχ-phase.Above 700℃,a new fcc-phase was found to be precipitated along withχ-phase,with a space group of Fd3c and a lattice parameter of 12.56?.The M6C carbides started to be precipitated at 700℃ in the vicinity ofχ-phase.And its amount basically increased with the increasing of temperature.An orientation relationship between M6C/γwas found:[100]c//[100]γ,（001）c//（001）γ,i.e.,the cube-on-cube relationship.
Sihan Chen1,2，Tian Liang1,3，Yangtao Zhou1，Weiwei Xing1，Chengwu Zheng1，Yingche Ma1，Jin Ming Wu3，Kui Liu1
1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research,Chinese Academy of Sciences2. School of Materials Science and Engineering,University of Science and Technology of China3. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering,Zhejiang University
摘 要：The precipitation behavior of different phases in a high-silicon stainless steel （6 wt%Si） during aging at 600–1050℃ for24 h was investigated.The morphology,crystal structure and composition of various precipitates were detailly characterized using optical microscopy,scanning electron microscopy and transmission electron microscopy.Four phases were mainly identified:χ-phase,M6C carbides,σphase and a new type of fcc-phase.During aging at 600–900℃,the main precipitate was（Cr,Mo and Si）-richχ-phase which was directly precipitated fromγmatrix.Theχ-phase was calibrated as bcc structure with a lattice parameter of 8.90?.The peak temperature for the precipitation ofχ-phase was 800℃,and it was dissolved when aging at temperatures above 1000℃.Theσ-phase was observed only at 700℃ and grew next toχ-phase.Above 700℃,a new fcc-phase was found to be precipitated along withχ-phase,with a space group of Fd3c and a lattice parameter of 12.56?.The M6C carbides started to be precipitated at 700℃ in the vicinity ofχ-phase.And its amount basically increased with the increasing of temperature.An orientation relationship between M6C/γwas found:[100]c//[100]γ,（001）c//（001）γ,i.e.,the cube-on-cube relationship.
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