回火时间对Cr-Ni-Cu系舰船用高强钢组织及力学性能的影响

doi:10.13251/j.issn.0254-6051.2024.02.033

金属热处理 ›› 2024, Vol. 49 ›› Issue (2): 208-214.DOI: 10.13251/j.issn.0254-6051.2024.02.033

回火时间对Cr-Ni-Cu系舰船用高强钢组织及力学性能的影响

董欣欣¹, 吴静¹, 李梦欢², 田亚强², 唐勤³

1.唐山科技职业技术学院材料工程系, 河北唐山 063000;
2.华北理工大学教育部现代冶金技术重点实验室, 河北唐山 063210;
3.首钢京唐钢铁联合有限责任公司钢轧作业部, 河北唐山 063200

收稿日期:2023-08-20 修回日期:2023-12-29 出版日期:2024-03-27 发布日期:2024-03-27
作者简介:董欣欣(1977—),女,副教授,硕士,主要研究方向为金属材料组织性能调控机理,E-mail:tgdongxin@sina.com
基金资助:
河北省自然科学基金重点项目(E2022209049);河北省高等学校科学研究计划(ZC2021255)

Effect of tempering time on microstructure and mechanical properties of Cr-Ni-Cu high strength steel for ships

Dong Xinxin¹, Wu Jing¹, Li Menghuan², Tian Yaqiang², Tang Qin³

1. Department of Materials Engineering, Tangshan Vocational and Technical College, Tangshan Hebei 063000, China;
2. Key Laboratory of the Ministry of Education for Modern Metallurgy Technology, North China University of Science and Technology, Tangshan Hebei 063210, China;
3. Hot Rolling Department, Shougang Jingtang United Iron and Steel Co., Ltd., Tangshan Hebei 063200, China

Received:2023-08-20 Revised:2023-12-29 Online:2024-03-27 Published:2024-03-27

摘要/Abstract

摘要： 采用SEM、EDS、拉伸及低温冲击等试验手段深入探究了淬、回火处理对Cr-Ni-Cu系舰船用低合金高强钢组织演变特征及力学行为影响规律。结果表明,试验钢经热轧后直接淬火及900 ℃×30 min水冷淬火后,显微组织均为板条马氏体和残留奥氏体,但后者较前者的-20 ℃低温冲击吸收能量高(分别为56 J和64 J),其主要是由于前者具有较大的马氏体板条间距。而经500 ℃不同时间回火后(30、60、120、240和480 min),其屈服强度、抗拉强度和低温冲击吸收能量均呈现先升高后降低趋势,其中最大抗拉强度为1021 MPa,最大屈服强度为998 MPa,最大低温冲击吸收能量为86 J。

关键词: 舰船用高强钢, 热处理, 板条马氏体, 残留奥氏体, 力学性能

Abstract: The microstructure evolution and mechanical properties of Cr-Ni-Cu high strength steel for ships after quenching and tempering were studied by means of SEM, EDS, mechanical test and low temperature impact test. The results show that after directly quenching and quenching at 900 ℃ for 30 min, both the microstructure is composed of lath martensite and retained austenite, but the low-temperature impact absorbed energy of the latter is higher than that of the former at -20 ℃ (56 J and 64 J, respectively), which is mainly attributed to the larger lath spacing of martensite. When tempered at 500 ℃ for 30, 60, 120, 240 and 480 min, the yield strength, tensile strength and low-temperature impact absorbed energy of the alloy steel show a trend of increasing first and then decreasing. The maximum tensile strength is 1021 MPa, the maximum yield strength is 998 MPa, and the maximum low-temperature impact absorbed energy at -20 ℃ is 86 J.

Key words: high strength steel for ships, heat treatment, lath martensite, retained austenite, mechanical properties

中图分类号:

TG142.1

董欣欣, 吴静, 李梦欢, 田亚强, 唐勤. 回火时间对Cr-Ni-Cu系舰船用高强钢组织及力学性能的影响[J]. 金属热处理, 2024, 49(2): 208-214.

Dong Xinxin, Wu Jing, Li Menghuan, Tian Yaqiang, Tang Qin. Effect of tempering time on microstructure and mechanical properties of Cr-Ni-Cu high strength steel for ships[J]. Heat Treatment of Metals, 2024, 49(2): 208-214.

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回火时间对Cr-Ni-Cu系舰船用高强钢组织及力学性能的影响

Effect of tempering time on microstructure and mechanical properties of Cr-Ni-Cu high strength steel for ships

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