固溶温度对G33超高强度钢微观组织和力学性能的影响

doi:10.13251/j.issn.0254-6051.2021.07.030

金属热处理 ›› 2021, Vol. 46 ›› Issue (7): 160-164.DOI: 10.13251/j.issn.0254-6051.2021.07.030

固溶温度对G33超高强度钢微观组织和力学性能的影响

熊金生^1,2, 宁静², 苏杰², 姜庆伟¹

1.昆明理工大学材料科学与工程学院, 云南昆明 650093;
2.钢铁研究总院特殊钢研究所, 北京 100081

收稿日期:2021-02-13 出版日期:2021-07-25 发布日期:2021-12-10
通讯作者: 苏杰,正高级工程师,E-mail:sujie@nercast.com
作者简介:熊金生(1995—),男,硕士研究生,主要研究方向为超高强度钢,E-mail:1579549067@qq.com。

Effect of solution temperature on microstructure and mechanical properties of ultra-high strength steel G33

Xiong Jinsheng^1,2, Ning Jing², Su Jie², Jiang Qingwei¹

1. Faculty of Materials Science and Engineering, Kunming University of Science and Technology, Kunming Yunan 650093, China;
2. Institute for Special Steels, Central Iron and Steel Research Institute, Beijing 100081, China

Received:2021-02-13 Online:2021-07-25 Published:2021-12-10

摘要/Abstract

摘要： 采用光学显微镜、扫描电镜和物理化学相分析技术等方法研究了固溶温度对G33新型超高强度钢组织和性能的影响。结果表明:G33钢在860 ℃固溶时板条马氏体基体上存在M₆C、VC和NbN未溶相并且以M₆C碳化物为主;随着固溶温度升高,未溶相快速溶解,VC和M₆C相分别在940 ℃和980 ℃完全溶解;M₆C、VC未溶相的溶解使微裂纹缺乏形核点而不易萌生,同时提升了基体中合金元素固溶量,增强了固溶强化效果,让G33钢在保持高强度(2000 MPa级)的同时提高了冲击性能。

关键词: 超高强度钢, 固溶温度, 力学性能, 微观组织, 未溶相

Abstract: Effect of solution treatment temperature on microstructure and properties of a ultra-high strength steel G33 was investigated by means of optical microscope, scanning electron microscope and physicochemical phase analysis. The results show that the undissolved phase of M₆C, VC and NbN exist in the lath martensite matrix of the G33 steel after solution treating at 860 ℃, in which, M₆C is dominant. With the increase of solution temperature, the undissolved phase is dissolved rapidly, VC and M₆C phases are dissolved completely at 940 ℃ and 980 ℃, respectively. Due to the dissolving of M₆C and VC phases, the microcrack is difficult to initiate for lack of nucleation sites. Meanwhile, the solid solution amount of alloy elements in the substrate is increased, which enhances the solid solution strengthening effect and improves the impact property of the tested steel while maintaining the high strength (grade of 2000 MPa).

Key words: ultra-high strength steel, solution temperature, mechanical properties, microstructure, undissolved phase

中图分类号:

TG135.1

熊金生, 宁静, 苏杰, 姜庆伟. 固溶温度对G33超高强度钢微观组织和力学性能的影响[J]. 金属热处理, 2021, 46(7): 160-164.

Xiong Jinsheng, Ning Jing, Su Jie, Jiang Qingwei. Effect of solution temperature on microstructure and mechanical properties of ultra-high strength steel G33[J]. Heat Treatment of Metals, 2021, 46(7): 160-164.

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固溶温度对G33超高强度钢微观组织和力学性能的影响

Effect of solution temperature on microstructure and mechanical properties of ultra-high strength steel G33

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