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Abstract <p>The microstructure and mechanical properties of the medium carbon cast steel ZG30MnSiMo (1.5% Mn–1.5% Si) subjected to quenching and carbon partitioning (Q&amp;P) are studied. It is shown that after heat treatment the microstructure of cast steel mainly consists of lath martensite and residual austenite. The fine-grained carbides are shown to gradually appear inside the martensite matrix with increasing carbon partitioning temperature or time. The volume fraction of residual austenite also grows with time. The tensile strength of steel decreases gradually, whereas the relative elongation and impact strength increase. The temperature of carbon partitioning is the process parameter that effectively controls the product of strength and elongation (PSE) indicator. Compared with quenching and low-temperature tempering, cast steel subjected to Q&amp;P heat treatment features a higher hardening coefficient, which can contribute to improving wear resistance.</p>

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Effect of Q&P Heat Treatment on Carbon Partitioning, on Microstructure, and on Properties of Medium Carbon Cast Steel Grade ZG30MnSiMo (1.5% Mn–1.5% Si)

  • 期刊论文

  • 发表日期：

    2025年6月1日

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  • Zhang Yong-Jun,
  • Liu Sen,
  • Han Jin-Tao

摘要

Abstract

The microstructure and mechanical properties of the medium carbon cast steel ZG30MnSiMo (1.5% Mn–1.5% Si) subjected to quenching and carbon partitioning (Q&P) are studied. It is shown that after heat treatment the microstructure of cast steel mainly consists of lath martensite and residual austenite. The fine-grained carbides are shown to gradually appear inside the martensite matrix with increasing carbon partitioning temperature or time. The volume fraction of residual austenite also grows with time. The tensile strength of steel decreases gradually, whereas the relative elongation and impact strength increase. The temperature of carbon partitioning is the process parameter that effectively controls the product of strength and elongation (PSE) indicator. Compared with quenching and low-temperature tempering, cast steel subjected to Q&P heat treatment features a higher hardening coefficient, which can contribute to improving wear resistance.