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<p>The heat treatment of high-speed steels (HSSs) was conducted with tempering times, and the microstructure and mechanical properties were systematically investigated. Results indicated that the heated HSSs were primarily constituted by α-Fe, MC, M<sub>2</sub>C, M<sub>6</sub>C, and M<sub>23</sub>C<sub>6</sub> (where <i>M</i> = Fe, V, Cr, etc.). As tempering time increases, the volume fraction of M<sub>23</sub>C<sub>6</sub> increases by 25.0%, and the content of retained austenite decreases from 13.21 to 3.53&#xa0;vol.%. These result in the macrohardness of HSS increasing from 58.11 HRC to 63.52 HRC and then decreasing to 57.72 HRC, and the impact toughness increases from 7.22 to 8.21&#xa0;J/cm<sup>2</sup>. The impact wear results showed that, with an increment of tempering time, the wear volume loss of the heat-treated HSS decreases from 168.21 to 46.69&#xa0;mm<sup>3</sup> and then increases to 121.51&#xa0;mm<sup>3</sup>. Its wear mechanism is mainly micro-cutting, supplemented by micro-fatigue.</p>

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Effect of Tempering Process on the Microstructure, Mechanical Properties and Wear Resistance of High-Speed Steel

  • 期刊论文

  • 发表日期：

    2025年6月19日

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  • Yan Wanjun,
  • Lei naiyi,
  • Ling Min,
  • Zhong Liqiong,
  • Yi Yanliang

摘要

The heat treatment of high-speed steels (HSSs) was conducted with tempering times, and the microstructure and mechanical properties were systematically investigated. Results indicated that the heated HSSs were primarily constituted by α-Fe, MC, M2C, M6C, and M23C6 (where M = Fe, V, Cr, etc.). As tempering time increases, the volume fraction of M23C6 increases by 25.0%, and the content of retained austenite decreases from 13.21 to 3.53 vol.%. These result in the macrohardness of HSS increasing from 58.11 HRC to 63.52 HRC and then decreasing to 57.72 HRC, and the impact toughness increases from 7.22 to 8.21 J/cm2. The impact wear results showed that, with an increment of tempering time, the wear volume loss of the heat-treated HSS decreases from 168.21 to 46.69 mm3 and then increases to 121.51 mm3. Its wear mechanism is mainly micro-cutting, supplemented by micro-fatigue.