摘要
顺应汽车轻量化发展需求,综合考虑汽车底盘结构件成型工艺特点,采用低C-Si-Mn-Nb-Ti-Mo复合成分体系设计实现良好焊接性能、第二相析出强化效果及促进中温贝氏体相变。通过理论计算制定热轧控轧控冷工艺,按照精轧终轧温度890℃、卷取温度570℃及前段3/4层流冷却模式,实现奥氏体区轧制稳定性、主要发生贝氏体相变,成功开发了铁素体/贝氏体为主、屈服强度769 MPa、抗拉强度840 MPa、延伸率17.92%、扩孔率高达110%、具有良好凸缘翻边和扩孔性能的高强度复相钢HR680/800CP,并成功应用于某车型底盘控制臂和新能源电池包支架。
Considering lightweight requirement and forming process characteristics of chassis structural parts,a complex alloying system of C-Si-Mn-Nb-Ti-Mo elements had been designed in order to achieve a better performance of weldability,second phase precipitation and bainite transformation at intermediate temperature.Based on theoretically calculation,a TMCP process where FET and CT are set at 890℃and 570℃and uses laminar cooling mode front 3/4,had been developed.During the TMCP process stable rolling steps were within austenite phase zone,and ferrite and bainite transformation occurred upon cooling period during and after laminar process.As a result HR680/800CP was produced which is featured with well flanging and hole expansion property.Microstructure mainly consists of Ferrite/Bainite,and mechanical properties reaches yield strength 769 MPa,tensile strength 840 MPa,elongation 17.92%,hole expansion ratio up to 110%.This product has been successfully used for structure parts of chassis control arm and battery pack bracket in new energy automobile.
作者
谭大庆
周莉
贾国翔
曹晓恩
文才君
薛仁杰
Tan Daqing;Zhou Li;Jia Guoxiang;Cao Xiao’en;Wen Caijun;Xue Renjie(School of Mechanical Engineering and Automation,Chongqing Industry Polytechnic College,Chongqing 401120,China;Hanbao Steel Plant,Han Steel Company,HBIS Group,Handan 056015,Hebei,China;Technology Center,Han Steel Company,HBIS Group,Handan 056015,Hebei,China;School of Material Science and Engineering,Xi’an Jiaotong University,Xi’an 710049,Shaanxi,China)
出处
《钢铁钒钛》
CAS
北大核心
2023年第4期167-172,共6页
Iron Steel Vanadium Titanium
基金
重庆市教委科学技术研究项目(KJQN202103211)。
关键词
复相钢
控轧控冷工艺
贝氏体
晶粒取向
扩孔性能
complex phase steel
controlled rolling and cooling process
bainite
misorientation of grain boundaries
hole expansion property
