氮含量对25Mn2CrVS贝氏体型非调质钢组织和性能的影响

doi:10.13251/j.issn.0254-6051.2020.04.007

金属热处理 ›› 2020, Vol. 45 ›› Issue (4): 34-39.DOI: 10.13251/j.issn.0254-6051.2020.04.007

氮含量对25Mn2CrVS贝氏体型非调质钢组织和性能的影响

蔡梦茹^1,2, 段美琪², 洪志伟³, 何宜柱¹, 王瑞珍²

1. 安徽工业大学材料科学与工程学院, 安徽马鞍山 243032;
2. 钢铁研究总院工程用钢研究所, 北京 100081;
3. 中科信工程咨询(北京)有限责任公司, 北京 100039

收稿日期:2019-10-14 出版日期:2020-04-25 发布日期:2020-05-08
作者简介:蔡梦茹(1991—),女,硕士,主要从事含铜高强船体结构用钢的研究,E-mail:13552490704@163.com
基金资助:
国家重点研发计划(2017YFB0304700,2017YFB0304702)

Effect of nitrogen content on microstructure and properties of 25Mn2CrVS bainite type non-quenched and tempered steel

Cai Mengru^1,2, Duan Meiqi², Hong Zhiwei³, He Yizhu¹, Wang Ruizhen²

1. School of Materials Science and Engineering, Anhui University of Technology, Ma'anshan Anhui 243032, China;
2. Institute for Engineering Steel, Central Iron and Steel Research Institute, Beijing 100081, China;
3. Zhongkexin Engineering Consulting (Beijing) Co., Ltd., Beijing 100039, China

Received:2019-10-14 Online:2020-04-25 Published:2020-05-08

摘要/Abstract

摘要： 研究了N含量(0.016wt%、0.029wt%和0.049wt%)对贝氏体型非调质钢25Mn2CrVS组织和力学性能的影响。结果表明:3组试验钢均为板条贝氏体、粒状贝氏体和铁素体组织,当氮含量从0.016%增加到0.029%时,试验钢强度和韧性增加,组织发生细化,且板条束状贝氏体含量减少,M/A相由长条状变成块状且分布弥散,针状铁素体增加;而氮含量增加至0.049%时,试验钢强度基本不变,韧性急剧下降,组织明显粗化,晶界铁素体形成。固溶钒可以促进板条束状贝氏体在晶界上的形成,奥氏体中析出的VN能够促进针状铁素体的形成。

关键词: 贝氏体钢, 微合金化, 非调质钢, 细晶强化, 针状铁素体

Abstract: Effect of nitrogen content (mass fraction of 0.016%, 0.029% and 0.049% respectively) on the microstructure and mechanical properties of 25Mn2CrVS bainite type non-quenched and tempered steel was studied. The results show that the microstructure of all the tested steels consists of lath bainite, granular bainite and ferrite. When the nitrogen content increases from 0.016% to 0.029%, the strength and toughness of the tested steel increase, and the microstructure is refined. When the nitrogen content increases to 0.049%, the strength of the steel is basically unchanged, but the toughness drops sharply, the microstructure is obviously coarsened, and the grain boundary ferrite is formed. Vanadium in solid solution can promote the formation of lath bainite at grain boundary, and VN particles precipitated from austenite can promote the formation of acicular ferrite.

Key words: bainitic steel, microalloying, non-quenched and tempered steel, grain refinement strengthening, acicular ferrite

中图分类号:

TG142.1

蔡梦茹, 段美琪, 洪志伟, 何宜柱, 王瑞珍. 氮含量对25Mn2CrVS贝氏体型非调质钢组织和性能的影响[J]. 金属热处理, 2020, 45(4): 34-39.

Cai Mengru, Duan Meiqi, Hong Zhiwei, He Yizhu, Wang Ruizhen. Effect of nitrogen content on microstructure and properties of 25Mn2CrVS bainite type non-quenched and tempered steel[J]. Heat Treatment of Metals, 2020, 45(4): 34-39.

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氮含量对25Mn2CrVS贝氏体型非调质钢组织和性能的影响

Effect of nitrogen content on microstructure and properties of 25Mn2CrVS bainite type non-quenched and tempered steel

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