时效时间对T91钢显微组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2023.01.025

金属热处理 ›› 2023, Vol. 48 ›› Issue (1): 145-148.DOI: 10.13251/j.issn.0254-6051.2023.01.025

时效时间对T91钢显微组织和力学性能的影响

张仁珊¹, 张鹏², 宗晓辉², 康学勤²

1.国能浙江宁海发电有限公司, 浙江宁波 315612;
2.中国矿业大学材料与物理学院, 江苏徐州 221008

收稿日期:2022-08-19 修回日期:2022-11-11 出版日期:2023-01-25 发布日期:2023-02-03
通讯作者: 康学勤,副教授,E-mail:cumtkxq@cumt.edu.cn
作者简介:张仁珊(1982—),男,工程师,主要研究方向为火力发电厂金属监督管理,E-mail: 16124160@chnenergy.com.cn。
基金资助:
中央高校基本科研业务费专项资金(2021XCZX01)

Effect of aging time on microstructure and mechanical properties of T91 steel

Zhang Renshan¹, Zhang Peng², Zong Xiaohui², Kang Xueqin²

1. China Energy Zhejiang Ninghai Power Generation Company Limited, Ningbo Zhejiang 315612, China;
2. School of Materials and Physics, China University of Mining and Technology, Xuzhou Jiangsu 221008, China

Received:2022-08-19 Revised:2022-11-11 Online:2023-01-25 Published:2023-02-03

摘要/Abstract

摘要： 采用光学显微镜、扫描电镜、室温拉伸和硬度试验等研究了T91钢管在680 ℃时效不同时间(0、240、480、720、1200、1680和2160 h)后的显微组织和力学性能。结果表明,T91钢管在680 ℃时效前后的显微组织均为回火马氏体,随着时效时间的增加,显微组织的晶界越来越明显,晶粒逐渐变粗。随着时效时间的增加,T91钢的硬度缓慢降低,强度(下屈服和抗拉强度)出现先降低、再升高、后又降低、最后呈缓慢降低趋势,塑性(伸长率)出现先增加、后降低、最后缓慢降低的过程,拉伸断口由微孔聚集型断裂转变为准解理断裂。

关键词: T91钢, 时效, 拉伸性能, 微观组织

Abstract: Microstructure and mechanical properties of T91 steel tube after aging at 680 ℃ for 240, 480, 720, 1200, 1680 and 2160 h were studied by means of optical microscopy, scanning electron microscopy, room temperature tensile testing and hardness testing. The results show that the microstructure of the T91 steel is tempered martensite before and after aging at 680 ℃ for different time, the grain boundaries of microstructure become more and more obvious with the increase of aging time, and the grains become coarser gradually. With the increase of aging time, the hardness of the T91 steel decreases slowly, the lower yield strength and tensile strength decrease first, then increase, then decrease and finally decrease slowly, and the elongation increases first, then decreases and finally decreases slowly. The tensile fracture of the T91 steel changes from microporous fracture to quasi cleavage fracture.

Key words: T91 steel, aging, tensile property, microstructure

中图分类号:

TG142.1

张仁珊, 张鹏, 宗晓辉, 康学勤. 时效时间对T91钢显微组织和力学性能的影响[J]. 金属热处理, 2023, 48(1): 145-148.

Zhang Renshan, Zhang Peng, Zong Xiaohui, Kang Xueqin. Effect of aging time on microstructure and mechanical properties of T91 steel[J]. Heat Treatment of Metals, 2023, 48(1): 145-148.

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时效时间对T91钢显微组织和力学性能的影响

Effect of aging time on microstructure and mechanical properties of T91 steel

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