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<p>7CrSiMnMoV steel is widely utilized in blade tools and automotive cover molds due to its requirement for exceptional hardness and wear resistance. However, conventional mold casting leads to the formation of coarse, irregularly shaped primary carbide, negatively impacting its mechanical properties. This study demonstrates that 7CrSiMnMoV steel with comparable properties to commercial products can be directly prepared using the sub-rapid solidification technique. Compared to traditional mold casting, sub-rapid solidification results in a significantly refined microstructure, where martensite replaces pearlite with uniformly distributed fine Mo, V, and Cr-rich carbides. More importantly, these advantageous features lead to a notable increase in hardness and wear resistance, with a hardness improvement of approximately 83 pct compared to mold casting samples (from 34.6 to 63.4 HRC), even surpassing commercial products (about 60 HRC).</p>

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Direct Preparation of 7CrSiMnMoV Steel Featuring Tailored Carbides and Excellent Hardness and Wear Resistance by Sub-rapid Solidification Technique

  • 期刊论文

  • 发表日期：

    2025年9月6日

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  • Lulu Song,
  • Chenyang Zhu,
  • Wanlin Wang,
  • Cheng Lu,
  • Jie Zeng

摘要

7CrSiMnMoV steel is widely utilized in blade tools and automotive cover molds due to its requirement for exceptional hardness and wear resistance. However, conventional mold casting leads to the formation of coarse, irregularly shaped primary carbide, negatively impacting its mechanical properties. This study demonstrates that 7CrSiMnMoV steel with comparable properties to commercial products can be directly prepared using the sub-rapid solidification technique. Compared to traditional mold casting, sub-rapid solidification results in a significantly refined microstructure, where martensite replaces pearlite with uniformly distributed fine Mo, V, and Cr-rich carbides. More importantly, these advantageous features lead to a notable increase in hardness and wear resistance, with a hardness improvement of approximately 83 pct compared to mold casting samples (from 34.6 to 63.4 HRC), even surpassing commercial products (about 60 HRC).