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Phase Characterization and Formation Behavior in 6 wt% Si High-silicon Austenitic Stainless Steel during Isothermal Aging

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The precipitation behavior of different phases in a high-silicon stainless steel (6 wt% Si) during aging at 600–1050 °C for 24 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, σ phase and a new type of fcc-phase. During aging at 600–900 °C, the main precipitate was (Cr, Mo and Si)-rich χ-phase which was directly precipitated from γ matrix. The χ-phase was calibrated as bcc structure with a lattice parameter of 8.90 Å. The peak temperature for the precipitation of χ-phase was 800 °C, and it was dissolved when aging at temperatures above 1000 °C. The σ-phase was observed only at 700 °C and grew next to χ-phase. Above 700 °C, a new fcc-phase was found to be precipitated along with χ-phase, with a space group of Fd3c and a lattice parameter of 12.56 Å. The M6C carbides started to be precipitated at 700 °C in the vicinity of χ-phase. And its amount basically increased with the increasing of temperature. An orientation relationship between M6C/γ was found: [100]c//[100]γ, (001)c//(001)γ, i.e., the cube-on-cube relationship.

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Authors and Affiliations

  1. Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Sihan Chen, Tian Liang, Yangtao Zhou, Weiwei Xing, Chengwu Zheng, Yingche Ma & Kui Liu

  2. School of Materials Science and Engineering, University of Science and Technology of China, Hefei, 230026, China

    Sihan Chen

  3. State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

    Tian Liang & JinMing Wu

  4. Zhejiang Xindeda Special Pipe Industry Co., Ltd, Wenzhou, 325024, China

    Guobin Li

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  1. Sihan Chen
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  2. Tian Liang
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  3. Yangtao Zhou
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  4. Weiwei Xing
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  6. Yingche Ma
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  7. JinMing Wu
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  9. Kui Liu
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Correspondence to Tian Liang or Kui Liu.

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Chen, S., Liang, T., Zhou, Y. et al. Phase Characterization and Formation Behavior in 6 wt% Si High-silicon Austenitic Stainless Steel during Isothermal Aging. Acta Metall. Sin. (Engl. Lett.) 34, 649–656 (2021). https://doi.org/10.1007/s40195-020-01152-7

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  • DOI: https://doi.org/10.1007/s40195-020-01152-7

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