冷轧压下率对390MPa级超低碳烘烤硬化钢组织性能和织构的影响  

Effect of Cold-rolled Reduction on Microstructure,Properties and Texture of Extra Low Carbon Back Hardening 390 MPa Steel

作　　者：吴雷[1] 陈银莉[1] 赵爱民[1] 刘光明[2] 熊爱明[2] 薛俊平[2] 

机构地区：[1]北京科技大学材料科学与工程学院,北京100083 [2]首钢技术研究院,北京100041

出　　处：《物理测试》2008年第6期5-8,12,共5页Physics Examination and Testing

基　　金：首钢和北京市科委资助项目

摘　　要：研究了不同冷轧压下率对BH390的组织性能和织构影响。研究结果表明,抗拉强度和屈服强度随着压下率的增大而降低,延伸率和r值随冷轧压下率增大先降低后升高,BH值有逐渐增大的趋势,最大为36 MPa,n值变化不大。在试验参数范围内,70%冷轧压下率条件下,屈服强度和抗拉强度达到最大值,分别为395 MPa和270 MPa;在70%压下率下δ最大39%,r值最大1.70,但BH值太低,只有16 MPa。通过比较不同冷轧压下率的退火板的组织和性能,冷轧压下率为80%时,退火后获得的铁素体组织其晶粒尺寸大,晶粒度为7.5级,钢板综合性能较好。The results shown that, under condition of higher cold rolling reduction, the yield strength and tensile strength decreased, the r-value and elongation decreased first, and then increased, meanwhile, BH-value is prone to increase gradually,with 36 MPa at maximum. With 70% cold rolling reduction, the maximun of yield strength and tensile strength was 270 MPa and 395 MPa respectively,and that of r-value and elongation was 1.7 and 39% respectively, while n-value had little change, It is concluded that larger grains and better synthetic properties were obtained under 80% cold-rolling reduction.

关 键 词：BH390 冷轧压下率 BH值 织构 

分 类 号：TG335.12[金属学及工艺—金属压力加工]