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<p>This study systematically investigates the influence of different heat treatment temperatures (room temperature, 750, 850, and 950&#xa0;°C) on the microstructural evolution, mechanical properties, frictional performance, and wear behavior of P550 stainless steel. The results indicate that as the heat treatment temperature increases, the grain size of P550 gradually grows, while the dislocation density significantly decreases. The proportion of small-angle grain boundaries decreases from 69.6% at room temperature to 1.02% at 950&#xa0;°C, whereas the proportion of twins increases from 21.5 to 49.5%. This microstructural evolution leads to a continuous increase in the friction coefficient and average friction force, accompanied by deteriorating wear morphology and declining wear resistance. Additionally, mechanical property analysis further reveals that P550 stainless steel achieves its optimal comprehensive performance after heat treatment at 750&#xa0;°C, characterized by enhanced yield strength (1454.2&#xa0;MPa), improved impact toughness (270 J), and increased microhardness (339.8 HV<sub>0.3</sub>), primarily due to Cr<sub>2</sub>N precipitation strengthening. However, at 850&#xa0;°C and above, significant grain coarsening results in a substantial reduction in impact toughness, with the fracture mode shifting from ductile to brittle fracture. These findings provide theoretical insights for optimizing the heat treatment process and designing high-temperature applications of P550 stainless steel.</p>

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Study on Mechanism of Influence of Heat Treatment on Mechanical Properties of High Strength Non-magnetic Stainless Steel

  • 期刊论文

  • 发表日期：

    2025年10月9日

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  • Cui Yan,
  • Shan Wang,
  • Yan Zhao,
  • Yangchuan Cai,
  • Xiaohua Wang,
  • Jinyao Mu

摘要

This study systematically investigates the influence of different heat treatment temperatures (room temperature, 750, 850, and 950 °C) on the microstructural evolution, mechanical properties, frictional performance, and wear behavior of P550 stainless steel. The results indicate that as the heat treatment temperature increases, the grain size of P550 gradually grows, while the dislocation density significantly decreases. The proportion of small-angle grain boundaries decreases from 69.6% at room temperature to 1.02% at 950 °C, whereas the proportion of twins increases from 21.5 to 49.5%. This microstructural evolution leads to a continuous increase in the friction coefficient and average friction force, accompanied by deteriorating wear morphology and declining wear resistance. Additionally, mechanical property analysis further reveals that P550 stainless steel achieves its optimal comprehensive performance after heat treatment at 750 °C, characterized by enhanced yield strength (1454.2 MPa), improved impact toughness (270 J), and increased microhardness (339.8 HV0.3), primarily due to Cr2N precipitation strengthening. However, at 850 °C and above, significant grain coarsening results in a substantial reduction in impact toughness, with the fracture mode shifting from ductile to brittle fracture. These findings provide theoretical insights for optimizing the heat treatment process and designing high-temperature applications of P550 stainless steel.