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<p>42CrMo steel is often used as the pick-body material for conical picks on continuous miners. The pick-body is susceptible to chipping and even breakage under harsh working conditions due to the inadequate impact toughness of the material. To enhance the impact toughness of 42CrMo steel, this paper introduces an innovative approach involving electromagnetic coupled cryogenic treatment. The specific parameters included a cryogenic temperature of − 190&#xa0;°C, a cryogenic time of 24 hours, a magnetic flux intensity of 0.5 Tesla, and a magnetization time of 5 seconds. The treatment improved the impact toughness by 20.74% compared to the traditional heat treatment. Microstructure analysis revealed an elevated dislocation density, which led to the formation of high-angle grain boundaries and a refinement size of martensite packets, blocks, and laths. The impact fracture showed ductile fracture characteristics, featuring shear lip zone, second fiber zone, dimples, and transgranular fracture.</p>

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Study on the Effect of Electromagnetic Coupled Cryogenic Treatment on the Impact Toughness of 42CrMo Steel

  • 期刊论文

  • 发表日期：

    2025年5月6日

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  • Liang Tang,
  • Rui Guo,
  • Shuai Li,
  • Xianguo Yan,
  • Xuemei Niu

摘要

42CrMo steel is often used as the pick-body material for conical picks on continuous miners. The pick-body is susceptible to chipping and even breakage under harsh working conditions due to the inadequate impact toughness of the material. To enhance the impact toughness of 42CrMo steel, this paper introduces an innovative approach involving electromagnetic coupled cryogenic treatment. The specific parameters included a cryogenic temperature of − 190 °C, a cryogenic time of 24 hours, a magnetic flux intensity of 0.5 Tesla, and a magnetization time of 5 seconds. The treatment improved the impact toughness by 20.74% compared to the traditional heat treatment. Microstructure analysis revealed an elevated dislocation density, which led to the formation of high-angle grain boundaries and a refinement size of martensite packets, blocks, and laths. The impact fracture showed ductile fracture characteristics, featuring shear lip zone, second fiber zone, dimples, and transgranular fracture.