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<p>This study examines the influence of temperature on the microstructural characteristics and mechanical properties of 2.25Cr-1Mo-0.25V steel during the tempering process conducted at temperatures ranging from 500 to 770&#xa0;°C. The findings indicate that as the tempering temperature increases, the quantity of precipitates within the experimental steel also rises, transitioning from predominantly single vanadium carbides (VC) to more complex carbides such as M<sub>7</sub>C<sub>3</sub> and M<sub>23</sub>C<sub>6</sub>, which contribute to enhanced strength. However, when the tempering temperature exceeds 700&#xa0;°C, the carbides located at the grain boundaries undergo coarsening, leading to a deterioration in toughness. Notably, during tempering within the range of 650-730&#xa0;°C, the decomposition of martensite (M)–austenite (A) islands, along with the temper softening of the bainite matrix, results in a significant improvement in toughness. Consequently, the 2.25Cr-1Mo-0.25V steel tempered at 730&#xa0;°C demonstrates an optimal balance between strength and toughness. Nevertheless, further increases in tempering temperature lead to carbide coarsening and the formation of irregular carbides at the grain boundaries, ultimately resulting in a reduction in toughness.</p>

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Effect of Tempering Temperature on Microstructure and Mechanical Properties of 2.25Cr-1Mo-0.25V Steel for Petrochemical Hydrogenation Reactors

  • 期刊论文

  • 发表日期：

    2025年11月7日

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  • Yonghao Cui,
  • Deng Luo,
  • Yanmei Li,
  • Yujian Zhang,
  • Jimou Zhang,
  • Chen Xu,
  • Minghui Song

摘要

This study examines the influence of temperature on the microstructural characteristics and mechanical properties of 2.25Cr-1Mo-0.25V steel during the tempering process conducted at temperatures ranging from 500 to 770 °C. The findings indicate that as the tempering temperature increases, the quantity of precipitates within the experimental steel also rises, transitioning from predominantly single vanadium carbides (VC) to more complex carbides such as M7C3 and M23C6, which contribute to enhanced strength. However, when the tempering temperature exceeds 700 °C, the carbides located at the grain boundaries undergo coarsening, leading to a deterioration in toughness. Notably, during tempering within the range of 650-730 °C, the decomposition of martensite (M)–austenite (A) islands, along with the temper softening of the bainite matrix, results in a significant improvement in toughness. Consequently, the 2.25Cr-1Mo-0.25V steel tempered at 730 °C demonstrates an optimal balance between strength and toughness. Nevertheless, further increases in tempering temperature lead to carbide coarsening and the formation of irregular carbides at the grain boundaries, ultimately resulting in a reduction in toughness.