不同球化级别1.25Cr0.5Mo钢的组织与性能

doi:10.13251/j.issn.0254-6051.2025.12.006

摘要/Abstract

摘要： 通过时效处理对1.25Cr0.5Mo(ASTM SA387 Grade11 CL2)钢进行1~5级球化,采用微观组织观察、能谱分析,室温和高温拉伸、室温冲击及纳米压痕试验,研究了不同球化级别1.25Cr0.5Mo钢的组织与性能,并对性能变化的原因进行分析。结果表明,在1.25Cr0.5Mo钢的球化初期(2级球化),球化速率较快,而随着球化程度的加剧,球化速率逐渐降低。在2级球化阶段,室温和高温拉伸强度以及室温冲击性能显著降低,这主要是因为球化后Cr、Mo等元素逐渐转移至碳化物中,导致试验钢的固溶强化作用大幅减弱; 3级到5级球化阶段,强度和冲击性能的变化幅度明显减小,这是由于在3到5级球化过程中,固溶强化作用已基本消失,因此性能不再显著变化。

关键词: 1.25Cr0.5Mo钢, 球化, 强度, 冲击性能

Abstract: 1.25Cr0.5Mo (ASTM SA387 Grade 11 CL2) steel was spheroidized to grades 1-5 through aging. Microstructure observation, energy dispersive spectroscopy (EDS) analysis, room-temperature and high-temperature tensile tests, room-temperature impact tests, and nanoindentation tests were employed to investigate the microstructure and properties of the 1.25Cr0.5Mo steel with different spheroidization grades, and the reasons for the property changes were analyzed. The results show that in the initial spheroidization stage (spheroidization grade 2) of the 1.25Cr0.5Mo steel, the spheroidization rate is relatively fast, while the spheroidization rate decreases gradually with the increase of spheroidization degree. At the spheroidization grade 2 stage, the tensile strength at room and high temperatures as well as the impact property decrease significantly, which is mainly attributed to the elements such as Cr and Mo are gradually transferred to carbides after spheroidization, resulting in a significant weakening of their solution strengthening effect. However, from spheroidization grade 3 to grade 5, the variation range of strength and impact property decreases obviously, which is due to the fact that the solution strengthening effect has basically disappeared. Therefore, the properties of the steel no longer change significantly at this stage.

Key words: 1.25Cr0.5Mo steel, spheroidization, strength, impact property

中图分类号:

TG115

陈彩霞, 周云, 赵青, 吴胜平, 姜勇. 不同球化级别1.25Cr0.5Mo钢的组织与性能[J]. 金属热处理, 2025, 50(12): 34-40.

Chen Caixia, Zhou Yun, Zhao Qing, Wu Shengping, Jiang Yong. Microstructure and properties of 1.25Cr0.5Mo steel with different spheroidization grades[J]. Heat Treatment of Metals, 2025, 50(12): 34-40.

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