N含量对高氮CrMnMo奥氏体不锈钢组织和性能的影响

doi:10.13251/j.issn.0254-6051.2020.01.032

金属热处理 ›› 2020, Vol. 45 ›› Issue (1): 160-163.DOI: 10.13251/j.issn.0254-6051.2020.01.032

N含量对高氮CrMnMo奥氏体不锈钢组织和性能的影响

翁建寅^1,2, 董瀚^1,3, 李北^1,2, 鲍贤勇², 宁小智¹

1. 钢铁研究总院工程用钢研究所, 北京 100081;
2. 飞亚达集团股份有限公司技术中心, 广东深圳 518057;
3. 上海大学材料学院, 上海 200444

收稿日期:2019-06-24 出版日期:2020-01-25 发布日期:2020-04-03
作者简介:翁建寅(1982—),男,高级工程师,博士研究生,主要从事高氮钢研究、钟表材料、航天材料研究,联系电话:15818626977,E-mail:21248726@qq.com。

Effect of nitrogen content on microstructure and properties of high nitrogen CrMnMo austenitic stainless steel

Weng Jianyin^1,2, Dong Han^1,3, Li Bei^1,2, Bao Xianyong², Ning Xiaozhi¹

1. Institute of Engineering Steel, Central Iron and Steel Research Institute, Beijing 100081, China;
2. Technology Center of FIYTA Group Co., Ltd., Shenzhen Guangdong 518057, China;
3. School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China

Received:2019-06-24 Online:2020-01-25 Published:2020-04-03

摘要/Abstract

摘要： 以18Cr14Mn3Mo钢为基本成分,设计并冶炼了氮含量为0.008%~0.77%的高氮CrMnMo奥氏体不锈钢。通过力学性能测试、组织观察、扫描电镜观察等方法,研究了N含量对其硬度、耐刻划性、塑性、强度等的影响。结果表明,N含量为0.42%及以下时,组织为双相,存在着一定量的铁素体,铁素体的存在使材料的塑性和韧性都较差。N含量0.77%试验钢的硬度最高,为273 HV0.5;耐刻划性能也最佳。0.59%N试验钢的塑性和韧性最好,断面收缩率和冲击吸收能量分别为79%和422 J。综合认为高氮CrMnMo奥氏体不锈钢的最佳N含量为0.77%。

关键词: 高氮钢, 氮含量, 力学性能, 塑性, 硬度, 显微组织

Abstract: High nitrogen CrMnMo austenitic stainless steels with nitrogen content of 0.008%-0.77% were designed and smelted with 18Cr14Mn3Mo steel as the basic composition. The effect of N content on the hardness, scratch resistance, plasticity and strength was studied by means of mechanical properties test, metallographic observation and scanning electron microscopy. The results show that when the N content is 0.42% or less, the microstructure is austenite plus a certain amount of ferrite, and the existence of such ferrite makes both the plasticity and the toughness of the steel poorer. The steel with 0.77%N has the highest hardness of 273 HV0.5 and the best scratch resistance. The steel with 0.59%N has the best plasticity and toughness with the percentage reduction of area after fracture of 79% and the impact absorbed energy of 422 J. Comprehensively considering, the optimum N content of the high nitrogen CrMnMo austenitic stainless steel is 0.77%.

Key words: high nitrogen steel, nitrogen content, mechanical properties, plasticity, hardness, microtructure

中图分类号:

TG142.1

翁建寅, 董瀚, 李北, 鲍贤勇, 宁小智. N含量对高氮CrMnMo奥氏体不锈钢组织和性能的影响[J]. 金属热处理, 2020, 45(1): 160-163.

Weng Jianyin, Dong Han, Li Bei, Bao Xianyong, Ning Xiaozhi. Effect of nitrogen content on microstructure and properties of high nitrogen CrMnMo austenitic stainless steel[J]. HTM, 2020, 45(1): 160-163.

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N含量对高氮CrMnMo奥氏体不锈钢组织和性能的影响

Effect of nitrogen content on microstructure and properties of high nitrogen CrMnMo austenitic stainless steel

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