回火温度对N63钢组织及力学性能的影响

doi:10.13251/j.issn.0254-6051.2023.07.014

金属热处理 ›› 2023, Vol. 48 ›› Issue (7): 79-83.DOI: 10.13251/j.issn.0254-6051.2023.07.014

回火温度对N63钢组织及力学性能的影响

韩顺¹, 李刚², 杨豪³, 厉鑫洋¹, 厉勇¹, 王春旭¹

1.钢铁研究总院有限公司特殊钢研究院, 北京 100081;
2.中国航发湖南动力机械研究所基础技术研究部, 湖南株洲 412002;
3.西北工业大学重庆科创中心, 重庆 401120

收稿日期:2023-02-14 修回日期:2023-06-01 出版日期:2023-07-25 发布日期:2023-09-04
通讯作者: 厉勇,正高级工程师,博士,E-mail:liysea@163.com
作者简介:韩顺(1987—),男,高级工程师,主要从事超高强度钢研究开发,E-mail:hanshunfa@126.com。
基金资助:
国家重点研发计划(2022YFB3705202)

Effect of tempering temperature on microstructure and mechanical properties of N63 steel

Han Shun¹, Li Gang², Yang Hao³, Li Xinyang¹, Li Yong¹, Wang Chunxu¹

1. Institute of Special Steels, Central Iron and Steel Research Institute Co., Ltd., Beijing 100081, China;
2. AECC Hunan Aviation Powerplant Research Institute, Zhuzhou Hubei 412002, China;
3. Chongqing Science and Technology Innovation Center of Northwest Polytechnic University, Chongqing 401120, China

Received:2023-02-14 Revised:2023-06-01 Online:2023-07-25 Published:2023-09-04

摘要/Abstract

摘要： 采用扫描电镜和透射电镜等手段研究了回火温度对N63钢组织及性能的影响。结果表明,N63钢具有良好的抗回火稳定性,260~600 ℃回火几乎未生成逆转变奥氏体,该温度区间内低温回火的析出相主要为ε-碳化物,当回火温度升高至480 ℃附近时基体析出M₂C碳化物,抗拉强度和屈服强度分别达到峰值,为1483 MPa和1138 MPa,然后随回火温度的升高迅速下降,600 ℃回火时抗拉强度仅为1009 MPa,此时N63钢马氏体基体板条分解严重,析出相为渗碳体和M₂₃C₆;冲击吸收能量随回火温度先下降后升高再下降,420 ℃回火冲击吸收能量最低,为79 J。综合不同回火温度下的微观组织和力学性能,N63钢在480 ℃回火具有优异的强韧性匹配。

关键词: N63钢, 回火, 力学性能, 微观组织, M₂₃C₆

Abstract: Effect of tempering temperature on mechanical properties and microstructure of the N63 steel was studied by means of scanning electron microscopy, transmission electron microscopy and so on. The results show that the N63 steel hardly generates reverse austenite after tempering, and has good tempering resistance. The main precipitated phase of the N63 steel after low tempering at 260-600 ℃ is ε-carbide. When the tempering temperature rises to around 480 ℃, M₂C carbide is precipitated from the matrix, and the tensile strength and yield strength reach the peak value of 1483 MPa and 1138 MPa, respectively. Then, the strength decreases rapidly with the increase of tempering temperature. The precipitated phase consists of cementite and M₂₃C₆ at 600 ℃, and the decomposition of martensitic matrix laths of N63 steel is serious whose tensile strength drop to only 1009 MPa. The impact absorbed energy decreases first, then increases and then decreases with the tempering temperature, which reaches the lowest value of 79 J when tempering at 420 ℃. Based on the microstructure and mechanical properties at different tempering temperature, N63 steel has excellent matching of strength and toughness when tempered at 480 ℃.

Key words: N63 steel, tempering, mechanical property, microstructure, M₂₃C₆

中图分类号:

TG142.2

韩顺, 李刚, 杨豪, 厉鑫洋, 厉勇, 王春旭. 回火温度对N63钢组织及力学性能的影响[J]. 金属热处理, 2023, 48(7): 79-83.

Han Shun, Li Gang, Yang Hao, Li Xinyang, Li Yong, Wang Chunxu. Effect of tempering temperature on microstructure and mechanical properties of N63 steel[J]. Heat Treatment of Metals, 2023, 48(7): 79-83.

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回火温度对N63钢组织及力学性能的影响

Effect of tempering temperature on microstructure and mechanical properties of N63 steel

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