彭亚敏,张国利,李荣斌,徐涛,季雪,白兴红,聂义宏,傅万堂

• 1:亚稳材料全国重点实验室
• 2:燕山大学材料科学与工程学院
• 3:天津重型装备工程研究有限公司
• 4:上海电机学院

摘要(Abstract)：

为实现调峰火电机组高压转子用钢常温力学性能与高温持久性能的最佳匹配，需采用合理的回火工艺对其处理，确保转子锻件的心部-表面性能尽可能均匀，这对于机组的安全稳定运行至关重要。利用光学显微镜(OM)、扫描电镜(SEM)、拉伸试验、冲击试验和高温持久试验等研究了回火温度及回火时间对高压转子用2%CrMoNiWV钢经950℃淬火后的显微组织与力学性能的影响规律。结果表明：在650～700℃回火保温3 h时，随着回火温度的升高，试验钢的强度单调下降，冲击吸收能量缓慢提高，在665℃回火时强韧性匹配较好；当回火温度为665℃及回火时间为3～60 h时，随着回火时间的延长，MX和M_(23)C_6型碳化物逐渐从基体中析出，尺寸从约1μm逐渐长大至5～8μm,形态从细小均匀的颗粒状逐渐变得不均匀或不规则，贝氏体板条特征逐渐变得不清晰；随着回火时间的延长，试验钢的强度先明显降低后缓慢下降，而冲击吸收能量则先缓慢上升后明显提升，且强度和韧性的转折点均为回火30 h时；随着回火时间的延长，试验钢的高温持久断裂时间呈下降趋势，当回火时间超过40 h后，高温持久强度剧烈下降；经950℃淬火+665℃×40 h回火后，2%CrMoNiWV钢的强度、冲击韧性和高温持久性能达到最佳匹配。

关键词(KeyWords)： 高压转子钢;回火工艺;显微组织;力学性能;高温持久性能

Abstract:

Keywords:

基金项目(Foundation): 国家科技重大专项(2025ZD0610400)

作者(Author): 彭亚敏,张国利,李荣斌,徐涛,季雪,白兴红,聂义宏,傅万堂

DOI: 10.13289/j.issn.1009-6264.2025-0322

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