摘要
研究了时效温度、双级时效处理温度以及碳化物析出对超高强度汽车钢20Mn2Cr冷轧板组织和性能的影响。结果表明,20Mn2Cr钢经过双级时效处理后的硬度远高于单级时效,且在550℃+300℃条件下双级时效时综合力学性能最佳,其抗拉强度、伸长率、强塑积分别为1418.1MPa、10.8%、15.3GPa·%。SEM观察表明,通过双级时效处理可实现20Mn2Cr钢的多相组织设计与调控,550℃+300℃双级时效处理后,20Mn2Cr钢的基体组织为粒状贝氏体及少量马氏体,且存在大量细小的Cr碳化物析出。这种多相组织是导致20Mn2Cr钢强度显著提升并获得强塑性良好匹配的主要原因。
The effects of aging temperature,double-step aging treatment and the precipitation behavior of carbides on the microstructure and mechanical properties of ultra-high-strength automotive steel 2oMn2Cr were investigated.The results indicate that the hardness of 20Mn2Cr steel after dual-stage aging treatment is significantly higher than that after single-stage aging.For the double-step aged steel,when the first-step aging temperature is set at 550℃,the optimum comprehensive mechanical properties with tensile strength of 1418.1 MPa,elongation of 10.8%,and product of strength and elongation of 15.3 GPa·%can be obtained.SEM observations show that the double-step aging treatment contributes to the design and control of the multi-phase microstructures of 20Mn2Cr steel.The matrix of the steel after 550 and 300℃double-step aging treatment consists of granular bainite and martensite.A large number of fine Cr-rich carbides can also be found in the double-step aging treated steel.The design of multi-phase microstructures is the primary reason for the enhancement of strength and the achievement of excellent match between strength and plasticity of 20Mn2Cr steel.
作者
黄文静
陈健
裘欣
丁汉林
朱国辉
王子健
HUANG Wenjing;CHEN Jian;QIU Xin;DING Hanlin;ZHU Guohui;WANG Zijian(School of Metallurgical Engineering,Anhui University of Technology,Ma'anshan 243002,Anhui,China;No.4 Steelmaking and Rolling General Plant,Maanshan Iron and Steel Co.,Ltd.,Ma'anshan 233241,Anhui,China;School of Optical and Electronic Information,Suzhou City University,Suzhou 215104,Jiangsu,China;School of Iron and Steel,Soochow University,Suzhou 215006,Jiangsu,China)
出处
《钢铁研究学报》
CAS
CSCD
北大核心
2024年第5期627-639,共13页
Journal of Iron and Steel Research
基金
国家自然科学基金资助项目(52174367)。
