连续退火工艺对780 MPa级冷轧增强成形性双相钢组织性能的影响  

Effect of continuous annealing process on microstructure and properties of 780 MPa cold-rolled dual phase steel with high formability

作　　者：周莉[1,2] 焦明木[3] 薛仁杰 赵欣 王卓 ZHOU Li;JIAO Mingmu;XUE Renjie;ZHAO Xin;WANG Zhuo(School of Rare Earth Industry,Inner Mongolia University of Science and Technology,Baotou 014010,Inner Mongolia,China;School of Electrical Engineering,Chongqing Industry Polytechnic College,Chongqing 401120,China;Handan Vocational College of Science and Technology,Handan 056046,Hebei,China;HBIS Materials Technology Research Institute,Shijiazhuang 052165,Hebei,China)

机构地区：[1]内蒙古科技大学稀土产业学院,内蒙古包头014010 [2]重庆工业职业技术学院电气工程学院,重庆401120 [3]邯郸科技职业学院,河北邯郸056046 [4]河钢材料技术研究院,河北石家庄052165

出　　处：《钢铁钒钛》2025年第1期192-197,共6页Iron Steel Vanadium Titanium

基　　金：重庆市教委科学技术研究项目(KJQN202103211,KJQN202403225);河北省科技研发平台建设专项(23561006D)。

摘　　要：基于产线装备特点设计开发了一种低成本780 MPa级冷轧增强成形性双相钢,并开展连续退火工艺对其组织性能影响的研究。结果表明:不同退火工艺条件下试验钢显微组织主要为铁素体与弥散分布的贝氏体、马氏体和少量马奥岛;快冷结束温度的提高有助于残留奥氏体含量的提升,最高残留奥氏体含量达到3.9%;残留奥氏体呈薄膜状或块状,多分布于B/F与F/F或B/M相界面处,残留奥氏体发挥TRIP效应实现塑性提升。A low-cost 780 MPa grade cold-rolled dual phase steel with high formability was designed and developed based on the equipment characteristics of the production line,and the effects of continuous annealing on the microstructure and properties of the cold rolled products were studied.The results show that under different annealing conditions,the microstructure of the experimental steel is mainly composed of ferrite,dispersed bainite,martensite,and a small amount of M/A islands.Increasing the end temperature of rapid cooling can increase the retained austenite content,with the highest content of retained austenite reaching 3.9%.The retained austenite is mostly distributed in the form of thin films or blocks at the interface between B/F and F/F or B/M phases,and the retained austenite exerts the TRIP effect to achieve plasticity improvement.

关 键 词：双相钢 退火工艺 残留奥氏体 TRIP效应 力学性能 

分 类 号：TF823[冶金工程—有色金属冶金]