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<p>By using scanning electron microscope (SEM), transmission electron microscope (TEM), x-ray diffraction (XRD), and size and mechanical properties tests, the effect of microstructure transformation on the size stability and mechanical properties of M50 steel during the stabilization treatment process was analyzed. Results show that under the alternating action of lattice distortion and heat energy increase at − 80 + 440&#xa0;°C, the carbon atoms of M50 steel are polarized and precipitated in the form of fine carbides, and the size of precipitated carbide is about 250-300&#xa0;nm, and the content of residual austenite is decreased. The precipitated carbide of M50 steel during the stabilization treatment reduces the size, and the formation of martensite increases the size. The above factors affect the size change together, and the size shows the decreasing law after the stabilization treatment, indicating that the precipitated carbide plays a key role in the impact of the size. The fatigue strength of M50 steel after stabilization treatment is 1060&#xa0;MPa, increased by 43%, which is related to the transformation of residual austenite under load, the size reduction of undissolved carbide, and the dispersion strengthening of precipitated carbide.</p>

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Effect of Phase Transformation on Size Stability and Mechanical Properties of M50 Steel

  • 期刊论文

  • 发表日期：

    2025年11月24日

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  • Yinghua Wei,
  • Bo Li,
  • Tianci Hao,
  • Lina Zhou,
  • Yong Su,
  • Xingfu Yu

摘要

By using scanning electron microscope (SEM), transmission electron microscope (TEM), x-ray diffraction (XRD), and size and mechanical properties tests, the effect of microstructure transformation on the size stability and mechanical properties of M50 steel during the stabilization treatment process was analyzed. Results show that under the alternating action of lattice distortion and heat energy increase at − 80 + 440 °C, the carbon atoms of M50 steel are polarized and precipitated in the form of fine carbides, and the size of precipitated carbide is about 250-300 nm, and the content of residual austenite is decreased. The precipitated carbide of M50 steel during the stabilization treatment reduces the size, and the formation of martensite increases the size. The above factors affect the size change together, and the size shows the decreasing law after the stabilization treatment, indicating that the precipitated carbide plays a key role in the impact of the size. The fatigue strength of M50 steel after stabilization treatment is 1060 MPa, increased by 43%, which is related to the transformation of residual austenite under load, the size reduction of undissolved carbide, and the dispersion strengthening of precipitated carbide.