Scholarlink

<p>A comprehensive understanding of the transformation kinetics of 30Cr2Ni4MoV steel, a critical material for large low-pressure rotors in nuclear power units, is essential for the precise design of its heat treatment processes. The transformation behavior was systematically characterized using thermal dilatometry experiments on a Gleeble 3500 thermomechanical simulator. Experimental results reveal that isothermal bainite transformation occurs both above and below the martensite start (Ms) temperature, with accelerated transformation kinetics below Ms, attributed to the additional nucleation sites provided by martensite/austenite interfaces. This study develops a unified kinetic model for isothermal bainite transformation in this steel, integrating incubation and transformation stages through integrated theoretical and experimental approaches. The model, based on internal state variable (ISV) theory and a shear transformation mechanism, exhibits excellent agreement between predicted and experimentally observed transformation kinetics after collaborative optimization using experimental data and numerical methods, thereby validating its capability for accurately describing complex bainite transformation behaviors. A systematic investigation of internal variables was conducted, followed by a quantitative analysis of the promoting effect of martensite/austenite interfaces on isothermal bainite transformation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Promoting Effect of Martensite on Bainite Transformation Kinetics: Unified Modeling Below and Above Martensite Start Temperature in 30Cr2Ni4MoV Steel

  • 期刊论文

  • 发表日期：

    2026年2月7日

查看全文
  • He Huang,
  • Feng Yang,
  • Peng Chen,
  • Hepeng Zhao,
  • Dianmei Song

摘要

A comprehensive understanding of the transformation kinetics of 30Cr2Ni4MoV steel, a critical material for large low-pressure rotors in nuclear power units, is essential for the precise design of its heat treatment processes. The transformation behavior was systematically characterized using thermal dilatometry experiments on a Gleeble 3500 thermomechanical simulator. Experimental results reveal that isothermal bainite transformation occurs both above and below the martensite start (Ms) temperature, with accelerated transformation kinetics below Ms, attributed to the additional nucleation sites provided by martensite/austenite interfaces. This study develops a unified kinetic model for isothermal bainite transformation in this steel, integrating incubation and transformation stages through integrated theoretical and experimental approaches. The model, based on internal state variable (ISV) theory and a shear transformation mechanism, exhibits excellent agreement between predicted and experimentally observed transformation kinetics after collaborative optimization using experimental data and numerical methods, thereby validating its capability for accurately describing complex bainite transformation behaviors. A systematic investigation of internal variables was conducted, followed by a quantitative analysis of the promoting effect of martensite/austenite interfaces on isothermal bainite transformation.