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<p>Low-alloy ultra-high-strength steel is widely used in aerospace and defense industries. However, the complex and inefficient conventional heat treatment processes limit its large-scale, low-cost application. In this study, the 30Si2MnCrMoVE steel was investigated through experiments designed with varying heating temperatures and cooling methods. The critical cooling rates under different conditions were determined, and the microstructure and Vickers hardness were systematically analyzed. Key results indicate that the combination of heating at 930&#xa0;°C followed by forced-air cooling produces a uniform and fine martensitic lath structure, high dislocation density, and a retained austenite content of 4.41 pct. This yields a favorable balance between strength and ductility, with average Vickers hardness of 510.8±24.5 HV, yield strength of 1468.0 MPa, and elongation of 9.56 pct, achieving performance comparable to that of the quenching and partitioning (Q&amp;P) process. This study provides a new approach for simplifying the processing route and reducing manufacturing costs of low-alloy ultra-high-strength steel.</p>

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Efficient Heat Treatment Process and Microstructure-Property Optimization of 30Si2MnCrMoVE Steel

  • 期刊论文

  • 发表日期：

    2026年5月18日

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  • Yu-Liang Zhou,
  • Xiao-Yan Liu,
  • Yan-Hui Yang,
  • Jing-Zhong Wang,
  • Lei Luo,
  • Zi-Xuan Wang

摘要

Low-alloy ultra-high-strength steel is widely used in aerospace and defense industries. However, the complex and inefficient conventional heat treatment processes limit its large-scale, low-cost application. In this study, the 30Si2MnCrMoVE steel was investigated through experiments designed with varying heating temperatures and cooling methods. The critical cooling rates under different conditions were determined, and the microstructure and Vickers hardness were systematically analyzed. Key results indicate that the combination of heating at 930 °C followed by forced-air cooling produces a uniform and fine martensitic lath structure, high dislocation density, and a retained austenite content of 4.41 pct. This yields a favorable balance between strength and ductility, with average Vickers hardness of 510.8±24.5 HV, yield strength of 1468.0 MPa, and elongation of 9.56 pct, achieving performance comparable to that of the quenching and partitioning (Q&P) process. This study provides a new approach for simplifying the processing route and reducing manufacturing costs of low-alloy ultra-high-strength steel.