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<p>Weapon barrels experience rapid cyclic heating during firing. This study systematically examines the microstructural evolution of PCrNi3MoVA steel subjected to simulated thermal cycles using a Gleeble thermal simulator. The results indicate that under transient thermal cycling, PCrNi3MoVA steel displays distinct microstructural responses across various temperature regimes. Below A<sub>c1</sub>, Cr-rich carbides precipitate and coarsen at grain boundaries, resulting in an initial increase followed by a decline in microhardness. Above A<sub>c3</sub>, grain evolution diverges: refinement occurs at 850&#xa0;°C due to VC pinning, while significant coarsening is observed at 920-1000&#xa0;°C as enhanced diffusion surpasses precipitate pinning. These behaviors, associated with competing nucleation and coarsening mechanisms under repeated thermal pulses, clarify the microstructural factors contributing to performance degradation in barrel steels under service conditions.</p>

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Analysis and Research on the Microstructure Evolution of PCrNi3MoVA Steel under Multiple High-Temperature Pulses

  • 期刊论文

  • 发表日期：

    2026年2月21日

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  • Zhenya Chen,
  • Sicong Wang,
  • Weitao Su,
  • Zihe Wang,
  • Shengwei Cheng,
  • Yunfei Du,
  • Yuxin Bai,
  • Ruitao Shi,
  • Xiaosheng Zhou

摘要

Weapon barrels experience rapid cyclic heating during firing. This study systematically examines the microstructural evolution of PCrNi3MoVA steel subjected to simulated thermal cycles using a Gleeble thermal simulator. The results indicate that under transient thermal cycling, PCrNi3MoVA steel displays distinct microstructural responses across various temperature regimes. Below Ac1, Cr-rich carbides precipitate and coarsen at grain boundaries, resulting in an initial increase followed by a decline in microhardness. Above Ac3, grain evolution diverges: refinement occurs at 850 °C due to VC pinning, while significant coarsening is observed at 920-1000 °C as enhanced diffusion surpasses precipitate pinning. These behaviors, associated with competing nucleation and coarsening mechanisms under repeated thermal pulses, clarify the microstructural factors contributing to performance degradation in barrel steels under service conditions.