N含量对超高强双相钢DP980组织与性能的影响

doi:10.13251/j.issn.0254-6051.2026.02.018

金属热处理 ›› 2026, Vol. 51 ›› Issue (2): 112-117.DOI: 10.13251/j.issn.0254-6051.2026.02.018

N含量对超高强双相钢DP980组织与性能的影响

陈濛潇^1,2, 成卓¹, 钟勇¹

1.宝山钢铁股份有限公司研究院, 上海 201999;
2.上海交通大学材料科学与工程学院, 上海 200240

收稿日期:2025-09-30 修回日期:2025-12-05 发布日期:2026-03-05
作者简介:陈潇(1989-),男,工程师,硕士,主要研究方向为汽车用先进高强钢产品开发及应用,E-mail:chenmengxiao@baosteel.com

Effect of N content on microstructure and properties of DP980 ultra-high strength dual-phase steel

Chen Mengxiao^1,2, Cheng Zhuo¹, Zhong Yong¹

1. Research Institute of Baoshan Iron & Steel Co., Ltd., Shanghai 201999, China;
2. School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2025-09-30 Revised:2025-12-05 Published:2026-03-05

摘要/Abstract

摘要： 利用扫描电镜、光学显微镜、透射电镜及拉伸试验机,研究了N含量对超高强双相钢DP980组织与性能的影响。结果表明,随着N含量增加,试验钢微观组织中马氏体含量增加,导致强度升高。随着N含量增加,试验钢基体中析出的纳米级TiN颗粒尺寸逐渐增大,微米级TiN夹杂物的数密度及粒径均增加,且TiN在液相下就已析出,TiN夹杂物在冷弯变形过程中容易产生内应力集中和变形局域化,导致成形性能恶化。

关键词: 双相钢, N含量, 显微组织, 拉伸性能, 冷弯性能

Abstract: Effect of nitrogen content on microstructure and properties of ultra-high strength dual-phase steel DP980 was investigated by means of scanning electron microscope, optical microscope, transmission electron microscope and tensile testing machine. The results indicate that as the nitrogen content increases, the martensite content in the microstructure of the tested steel rises, leading to enhanced strength. With the increase of nitrogen content, the size of nanoscale TiN particles precipitated in the matrix gradually increases, while the number density and particle size of micron-scale TiN inclusions also grow. Moreover, TiN begins to precipitate in the liquid phase, and TiN inclusions tend to cause internal stress concentration and deformation localization during cold bending, resulting in deteriorated formability.

Key words: dual-phase steel, N content, microstructure, tensile properties, cold bending performance

中图分类号:

TG142.1

陈濛潇, 成卓, 钟勇. N含量对超高强双相钢DP980组织与性能的影响[J]. 金属热处理, 2026, 51(2): 112-117.

Chen Mengxiao, Cheng Zhuo, Zhong Yong. Effect of N content on microstructure and properties of DP980 ultra-high strength dual-phase steel[J]. Heat Treatment of Metals, 2026, 51(2): 112-117.

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N含量对超高强双相钢DP980组织与性能的影响

Effect of N content on microstructure and properties of DP980 ultra-high strength dual-phase steel

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