20Cr1Mo1VTiB螺栓钢高温长期时效后的组织演变及力学性能

doi:10.13251/j.issn.0254-6051.2023.09.033

金属热处理 ›› 2023, Vol. 48 ›› Issue (9): 197-202.DOI: 10.13251/j.issn.0254-6051.2023.09.033

20Cr1Mo1VTiB螺栓钢高温长期时效后的组织演变及力学性能

李鑫¹, 武志广¹, 赵吉庆², 杨钢²

1.中国原子能科学研究院, 北京 102413;
2.钢铁研究总院有限公司特殊钢研究院, 北京 100081

收稿日期:2023-04-02 修回日期:2023-07-08 出版日期:2023-09-25 发布日期:2023-10-25
作者简介:李鑫(1990—),男,工程师,硕士,主要研究方向为反应堆结构材料,E-mail:lixinustb@126.com
基金资助:
国家自然科学基金(51971226)

Microstructure evolution and mechanical properties of 20Cr1Mo1VTiB bolt steel after long-term aging at high temperature

Li Xin¹, Wu Zhiguang¹, Zhao Jiqing², Yang Gang²

1. China Institute of Atomic Energy, Beijing 102413, China;
2. Research Institute of Special Steels, Central Iron & Steel Research Institute Company Limited, Beijing 100081, China

Received:2023-04-02 Revised:2023-07-08 Online:2023-09-25 Published:2023-10-25

摘要/Abstract

摘要： 研究了20Cr1Mo1VTiB螺栓钢在530 ℃、最长10 000 h时效后的组织演变和力学性能变化规律。结果表明,20Cr1Mo1VTiB螺栓钢时效过程中,MC相主要析出并分布在贝氏体板条内和板条界,MC相析出量增加但尺寸未见明显粗化。随时效时间延长,贝氏体板条边界逐渐模糊,板条宽度逐渐增加。经过530 ℃、最长10 000 h时效后,20Cr1Mo1VTiB螺栓钢室温、高温强度无明显变化,低温冲击性能有所上升,组织回复作用明显,表明该钢在530 ℃下组织稳定性良好。

关键词: 20Cr1Mo1VTiB螺栓钢, 时效, 显微组织, 力学性能

Abstract: Microstructure evolution and mechanical properties of 20Cr1Mo1VTiB bolt steel aged at 530 ℃ for 10 000 h at most were studied. The results show that during the aging process, the MC phases are mainly precipitated and distributed in the bainite laths and at the lath boundaries, and the precipitated amount of MC phases increases but the size does not show significant coarsening. With the increase of aging time, the bainite lath boundaries become blurred gradually and the lath width of bainite increases. After aging for up to 10 000 h at 530 ℃, the strength of the 20Cr1Mo1VTiB bolt steel has no significant change at room temperature and high temperature, the impact property at low temperature increases, and the microstructure recovery effect is obvious, indicating that the steel has good microstructure stability at 530 ℃.

Key words: 20Cr1Mo1VTiB bolt steel, aging, microstructure, mechanical properties

中图分类号:

TG142.1

李鑫, 武志广, 赵吉庆, 杨钢. 20Cr1Mo1VTiB螺栓钢高温长期时效后的组织演变及力学性能[J]. 金属热处理, 2023, 48(9): 197-202.

Li Xin, Wu Zhiguang, Zhao Jiqing, Yang Gang. Microstructure evolution and mechanical properties of 20Cr1Mo1VTiB bolt steel after long-term aging at high temperature[J]. Heat Treatment of Metals, 2023, 48(9): 197-202.

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20Cr1Mo1VTiB螺栓钢高温长期时效后的组织演变及力学性能

Microstructure evolution and mechanical properties of 20Cr1Mo1VTiB bolt steel after long-term aging at high temperature

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