G115钢大口径厚壁管长期时效后的微观组织及力学性能

doi:10.13251/j.issn.0254-6051.2025.03.031

金属热处理 ›› 2025, Vol. 50 ›› Issue (3): 196-200.DOI: 10.13251/j.issn.0254-6051.2025.03.031

G115钢大口径厚壁管长期时效后的微观组织及力学性能

梁晓东¹, 王炜², 李永清², 袁博¹, 郭晓峰¹, 程言龙³

1.内蒙古科技大学机械工程学院, 内蒙古包头 014010;
2.内蒙古北方重工业集团有限公司, 内蒙古包头 014010;
3.上海市特种设备监督检验技术研究院, 上海 200333

收稿日期:2024-09-23 修回日期:2025-01-19 出版日期:2025-03-25 发布日期:2025-05-14
通讯作者: 郭晓峰,副教授,博士,E-mail:guoxiaofeng@imust.edu.cn
作者简介:梁晓东(1998—),男,硕士研究生,主要研究方向为高温强度理论与先进制造技术,E-mail:liangxiaodong2021@126.com。
基金资助:
内蒙古自治区青年科技英才支持计划(NJYT22071);内蒙古自治区直属高校基本科研业务费项目(104)

Microstructure and mechanical properties of G115 steel large-diameter thick-walled tube during long-term aging

Liang Xiaodong¹, Wang Wei², Li Yongqing², Yuan Bo¹, Guo Xiaofeng¹, Cheng Yanlong³

1. School of Mechanical Engineering, Inner Mongolia University of Science and Technology, Baotou Inner Mongolia 014010, China;
2. Inner Mongolia North Heavy Industries Group Co., Ltd., Baotou Inner Mongolia 014010, China;
3. Shanghai Institute of Special Equipment Inspection and Technical Research, Shanghai 200333, China

Received:2024-09-23 Revised:2025-01-19 Online:2025-03-25 Published:2025-05-14

摘要/Abstract

摘要： 采用光学显微镜、场发射扫描电镜、场发射透射电镜、室温拉伸、室温冲击试验等研究了675 ℃高温时效对G115钢大口径厚壁管微观组织演变及室温力学性能的影响。结果表明,原始正火+回火态G115钢基体组织为回火马氏体,析出相为M₂₃C₆碳化物和MX碳氮化物。在675 ℃长期时效过程中,基体组织仍为回火马氏体,但时效过程中马氏体板条出现了缓慢的回复,M₂₃C₆和MX相缓慢长大,Laves相快速析出并粗化。与原始状态性能相比,G115钢抗拉强度和屈服强度均呈现单调下降的变化规律,而延伸率则呈先升后降的变化趋势;较原始态,时效初期G115钢的冲击性能下降,随时效的进行,冲击性能整体呈先升后降的变化趋势。

关键词: G115钢, 长期时效, 组织, 力学性能

Abstract: Effect of high-temperature aging at 675 ℃ on microstructure evolution and room temperature mechanical properties of large-diameter thick-walled pipes of G115 steel was investigated by using optical microscope, field-emission scanning electron microscope, field-emission transmission electron microscope, room temperature tensile and impact tests. The results show that the matrix structure of the G115 steel in the original normalized and tempered state is tempered martensite, and the precipitated phases are M₂₃C₆ carbide and MX carbonitrides. During the long-term aging process at 675 ℃, the matrix structure remains tempered martensite, however, a slow recovery of the martensite laths occurs. The M₂₃C₆ and MX phases grow slowly, and the Laves phase precipitates rapidly and coarsens. Compared with the properties in the original state, both the tensile strength and yield strength of the G115 steel show a monotonous decreasing trend, while the elongation first increases and then decreases. And the impact property of the G115 steel decreases in the initial stage of aging, but as the aging progresses, the impact property as a whole shows a trend of first increasing and then decreasing.

Key words: G115 steel, long-term aging, microstructure, mechanical properties

中图分类号:

TG115.9

梁晓东, 王炜, 李永清, 袁博, 郭晓峰, 程言龙. G115钢大口径厚壁管长期时效后的微观组织及力学性能[J]. 金属热处理, 2025, 50(3): 196-200.

Liang Xiaodong, Wang Wei, Li Yongqing, Yuan Bo, Guo Xiaofeng, Cheng Yanlong. Microstructure and mechanical properties of G115 steel large-diameter thick-walled tube during long-term aging[J]. Heat Treatment of Metals, 2025, 50(3): 196-200.

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G115钢大口径厚壁管长期时效后的微观组织及力学性能

Microstructure and mechanical properties of G115 steel large-diameter thick-walled tube during long-term aging

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