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<p>In this research, the effect of Q&amp;P (quench and partitioning) and Q&amp;T (quench and tempering) processes on microstructural evolutions and mechanical properties of a high-silicon medium-carbon cast steel was compared. For this purpose, quenching temperature, partitioning time, partitioning temperature, as well as quenching media, and tempering temperature were investigated. The results showed that the amount of retained austenite after quenching was 13%, and after tempering at 350&#xa0;°C, it reduced to about 8%, whereas in Q&amp;P conditions, the highest and lowest amount of retained austenite was 22.4 and 8.6%, respectively. In some Q&amp;P conditions, the amount of austenite carbon concentration was more than the amount predicted by the CCE (constrained carbon equilibrium) model (~1.2&#xa0;wt%). For Q&amp;T conditions, oil quenching and tempering at 200&#xa0;°C achieved the highest impact energy. Increasing tempering temperature from 200 to 300&#xa0;°C led to a decrease in impact energy, and at 350&#xa0;°C, it has slightly increased again. In the Q&amp;P process, impact energy above 40J with a hardness of more than 40 HRC was achieved. Finally, a comparison of the results obtained for the Q&amp;T and Q&amp;P process showed that the Q&amp;P process provides the best combination of hardness and impact energy for the investigated steel.</p>

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Comparison of Microstructure and Mechanical Properties After Quench–Temper and Quench–Partitioning Heat Treatment for a High-Silicon Medium-Carbon Cast Steel

  • 期刊论文

  • 发表日期：

    2025年6月12日

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  • Saeed Hosseinreza,
  • Habibollah Rastegari,
  • Aliakbar Abedini

摘要

In this research, the effect of Q&P (quench and partitioning) and Q&T (quench and tempering) processes on microstructural evolutions and mechanical properties of a high-silicon medium-carbon cast steel was compared. For this purpose, quenching temperature, partitioning time, partitioning temperature, as well as quenching media, and tempering temperature were investigated. The results showed that the amount of retained austenite after quenching was 13%, and after tempering at 350 °C, it reduced to about 8%, whereas in Q&P conditions, the highest and lowest amount of retained austenite was 22.4 and 8.6%, respectively. In some Q&P conditions, the amount of austenite carbon concentration was more than the amount predicted by the CCE (constrained carbon equilibrium) model (~1.2 wt%). For Q&T conditions, oil quenching and tempering at 200 °C achieved the highest impact energy. Increasing tempering temperature from 200 to 300 °C led to a decrease in impact energy, and at 350 °C, it has slightly increased again. In the Q&P process, impact energy above 40J with a hardness of more than 40 HRC was achieved. Finally, a comparison of the results obtained for the Q&T and Q&P process showed that the Q&P process provides the best combination of hardness and impact energy for the investigated steel.