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<p>To meet the industrial demands for higher material performance and longer service life of 12Cr18Ni9 steel, low-cycle fatigue (LCF) tests were performed at room temperature (RT) on the as-built cast samples (AB) and heat-treated cast samples (HT). Electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were used to analyze the microstructural evolution and failure mechanisms after LCF. EBSD observations of the initial samples revealed a significant reduction in grain size after heat treatment. Experimental results indicated a pronounced increase in cyclic hardening under high strain amplitudes (1.0%) and an extended fatigue life in the HT samples. EBSD and TEM analyses further demonstrated that in the presence of reduced dislocation density and grain size after heat treatment, the HT samples underwent a martensitic transformation under a strain amplitude of 1.0%, which enabled the samples to preserve their stable fatigue life with a stable strain amplitude and enhanced the cyclic hardening effect of the material. Additionally, a life prediction model based on the energy method was proposed for the AB and HT samples.</p>

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A comprehensive study on the low-cycle fatigue properties, damage mechanism, and microstructure evolution of 12Cr18Ni9 steel during heat treatment processes

  • 期刊论文

  • 发表日期：

    2025年6月17日

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  • Zhengwei Hu,
  • Ting Mei,
  • Tongfei Zou,
  • Yunqing Jiang,
  • Shengyu Ni,
  • Tunan ZhangYu,
  • Tianjian Wang,
  • Hong Zhang,
  • Liming Lei,
  • Qingyuan Wang

摘要

To meet the industrial demands for higher material performance and longer service life of 12Cr18Ni9 steel, low-cycle fatigue (LCF) tests were performed at room temperature (RT) on the as-built cast samples (AB) and heat-treated cast samples (HT). Electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were used to analyze the microstructural evolution and failure mechanisms after LCF. EBSD observations of the initial samples revealed a significant reduction in grain size after heat treatment. Experimental results indicated a pronounced increase in cyclic hardening under high strain amplitudes (1.0%) and an extended fatigue life in the HT samples. EBSD and TEM analyses further demonstrated that in the presence of reduced dislocation density and grain size after heat treatment, the HT samples underwent a martensitic transformation under a strain amplitude of 1.0%, which enabled the samples to preserve their stable fatigue life with a stable strain amplitude and enhanced the cyclic hardening effect of the material. Additionally, a life prediction model based on the energy method was proposed for the AB and HT samples.