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<p>By means of microstructure observation and mechanical property tests, the effect of austenitizing temperature on the microstructure, hardness, and friction and wear properties of 20CrMoH steel after the cementation was studied. Results show that the number of carbides in the microstructure of the carburized layer of the steel decreased with the increase of austenitizing temperature, which was related to the carbon solubility and atomic diffusion rate of the matrix in the carburized layer of the sample at different austenitizing temperatures. When the austenitizing temperatures were 800, 820, 840, and 860&#xa0;°C, the surface hardness decreased from 696.6 to 693.7&#xa0;HV, 685.6 &#xa0;HV, and 667.3&#xa0;HV, respectively, and the hardness gradient from the surface to the core was formed, which was related to the dispersion strengthening of carbides in the carburized layer of the sample and the gradient of carbon concentration from the surface to the inside. When the austenitizing temperature increased from 800 to 820&#xa0;℃, 840&#xa0;℃, and 860&#xa0;℃, the friction coefficient and wear loss of the samples firstly decreased and then increased, the wear loss was 15.5, 7.1, 4.5, and 6.6&#xa0;mg, respectively. Thereinto, when the austenitizing temperature was 840&#xa0;℃, the peeling pits on the abrasion surface were the smallest, the abrasion depth was 54&#xa0;μm, and the surface showed a higher abrasion resistance, which was related to the combined effect of the surface hardness and the strength of the core.</p>

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Effect of Austenitizing Temperature on Microstructure and Wear Resistance of 20CrMoH Steel

  • 期刊论文

  • 发表日期：

    2026年7月11日

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  • Shuai Yang,
  • Xiaoliang Hou,
  • Penghan Yu,
  • Yinghua Wei,
  • Yong Su,
  • Bo Li,
  • Xingfu Yu

摘要

By means of microstructure observation and mechanical property tests, the effect of austenitizing temperature on the microstructure, hardness, and friction and wear properties of 20CrMoH steel after the cementation was studied. Results show that the number of carbides in the microstructure of the carburized layer of the steel decreased with the increase of austenitizing temperature, which was related to the carbon solubility and atomic diffusion rate of the matrix in the carburized layer of the sample at different austenitizing temperatures. When the austenitizing temperatures were 800, 820, 840, and 860 °C, the surface hardness decreased from 696.6 to 693.7 HV, 685.6  HV, and 667.3 HV, respectively, and the hardness gradient from the surface to the core was formed, which was related to the dispersion strengthening of carbides in the carburized layer of the sample and the gradient of carbon concentration from the surface to the inside. When the austenitizing temperature increased from 800 to 820 ℃, 840 ℃, and 860 ℃, the friction coefficient and wear loss of the samples firstly decreased and then increased, the wear loss was 15.5, 7.1, 4.5, and 6.6 mg, respectively. Thereinto, when the austenitizing temperature was 840 ℃, the peeling pits on the abrasion surface were the smallest, the abrasion depth was 54 μm, and the surface showed a higher abrasion resistance, which was related to the combined effect of the surface hardness and the strength of the core.