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<p>PCrNi3MoV, a Cr-Ni-Mo-V high-strength alloy steel, is commonly utilized in harsh environments involving transient high-temperature conditions. Conventional methods face significant challenges in simulating the phase transformation processes of materials under transient high-energy pulse conditions. In this work, a high-temperature pulse experiment was conducted using Gleeble on PCrNi3MoV material, with holding temperature, holding time, and heating rate serving as independent variables. The potential damage of high-temperature pulse to microstructure was analyzed. Thermal expansion curves were used to create the phase transition equation for non-isothermal austenitization. The microstructure observation indicated that the primary factor influencing the microstructure was the peak temperature. At 700&#xa0;°C, the microstructure consists of networked cementite and ferrite. At 800–900&#xa0;°C, the&#xa0;microstructure&#xa0;is a kind of lath martensite with genetic initial microstructure&#xa0;characteristics. At 1000&#xa0;°C, the microstructure is typical lath martensite. Finally, the changes in grain size were quantified, and the samples were examined following multiple thermal cycles.</p>

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Analytical Investigation of Phase Transition in the Microstructure of PCrNi3MoV Steel under High-Temperature Pulses

  • 期刊论文

  • 发表日期：

    2025年6月26日

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  • Zhenya Chen,
  • Weitao Su,
  • Shengwei Cheng,
  • Yunfei Du,
  • Yuxin Bai,
  • Ruitao Shi

摘要

PCrNi3MoV, a Cr-Ni-Mo-V high-strength alloy steel, is commonly utilized in harsh environments involving transient high-temperature conditions. Conventional methods face significant challenges in simulating the phase transformation processes of materials under transient high-energy pulse conditions. In this work, a high-temperature pulse experiment was conducted using Gleeble on PCrNi3MoV material, with holding temperature, holding time, and heating rate serving as independent variables. The potential damage of high-temperature pulse to microstructure was analyzed. Thermal expansion curves were used to create the phase transition equation for non-isothermal austenitization. The microstructure observation indicated that the primary factor influencing the microstructure was the peak temperature. At 700 °C, the microstructure consists of networked cementite and ferrite. At 800–900 °C, the microstructure is a kind of lath martensite with genetic initial microstructure characteristics. At 1000 °C, the microstructure is typical lath martensite. Finally, the changes in grain size were quantified, and the samples were examined following multiple thermal cycles.