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<p>Using heat treatment, microstructure characterization and mechanical property tests, the effects of solid solution time on carbide dissolution and precipitation behavior, hardness and wear resistance of 30CrMnSi steel were investigated. The results indicate that after solid solution treatment at 900°C and quenching, the microstructure primarily consisted of martensite, retained austenite and undissolved carbides. As the solid solution time increased from 30&#xa0;min and 60&#xa0;min to 90&#xa0;min, the undissolved carbides were progressively dissolved, the content of the retained austenite increased, and the microstructure was most homogeneous when the solid solution time was 60&#xa0;min. The quenched hardness of the steel decreased progressively with increasing solid solution time, primarily governed by the carbon content in martensite and the amount of retained austenite. After tempering, the microstructure mainly comprised tempered sorbite and carbides. The hardness of the tempered steel decreased with prolonged solid solution time, mainly influenced by the number of finely dispersed secondary precipitated carbides. When the solution time was 60&#xa0;min, the wear loss of the steel was the least at 7.3&#xa0;mg. The uniformly distributed tempered sorbite and fine carbides effectively inhibited plastic deformation and crack propagation during the wear process, and thus the wear resistance reached its best level.</p>

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Effect of Solid Solution Time on Microstructure and Mechanical Properties of 30CrMnSi Steel

  • 期刊论文

  • 发表日期：

    2025年12月8日

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  • Su Yong,
  • Jia Xiaodong,
  • Xu Jidong,
  • Lu Xudong,
  • Han Heng,
  • Yu Xingfu

摘要

Using heat treatment, microstructure characterization and mechanical property tests, the effects of solid solution time on carbide dissolution and precipitation behavior, hardness and wear resistance of 30CrMnSi steel were investigated. The results indicate that after solid solution treatment at 900°C and quenching, the microstructure primarily consisted of martensite, retained austenite and undissolved carbides. As the solid solution time increased from 30 min and 60 min to 90 min, the undissolved carbides were progressively dissolved, the content of the retained austenite increased, and the microstructure was most homogeneous when the solid solution time was 60 min. The quenched hardness of the steel decreased progressively with increasing solid solution time, primarily governed by the carbon content in martensite and the amount of retained austenite. After tempering, the microstructure mainly comprised tempered sorbite and carbides. The hardness of the tempered steel decreased with prolonged solid solution time, mainly influenced by the number of finely dispersed secondary precipitated carbides. When the solution time was 60 min, the wear loss of the steel was the least at 7.3 mg. The uniformly distributed tempered sorbite and fine carbides effectively inhibited plastic deformation and crack propagation during the wear process, and thus the wear resistance reached its best level.