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<p>This study presents a systematic investigation of the martensitic substructure evolution behaviors in the heat-affected zone of P91 steel by integrating <i>in situ</i> observations with post-mortem microstructural analysis. The results show that the initial burst of martensite transformation produces large blocks, which fragment the remaining austenite into isolated regions that subsequently transform into smaller blocks. Variations in prior austenite grain size are found to influence both the block size and dislocation distribution within martensites.</p>

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Tracking Martensitic Substructure Evolution in the Heat-Affected Zone of P91 Steel: Integrating CSLM Observation and Post-mortem Microstructural Analysis

  • 期刊论文

  • 发表日期：

    2025年9月20日

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  • Zhengman Gu,
  • Ming Zhong,
  • Yuan Gong,
  • Peng Zuo,
  • Peter Szabo,
  • Ishwar Kapoor,
  • Cong Wang

摘要

This study presents a systematic investigation of the martensitic substructure evolution behaviors in the heat-affected zone of P91 steel by integrating in situ observations with post-mortem microstructural analysis. The results show that the initial burst of martensite transformation produces large blocks, which fragment the remaining austenite into isolated regions that subsequently transform into smaller blocks. Variations in prior austenite grain size are found to influence both the block size and dislocation distribution within martensites.