微观组织对高强度双相钢板冲压回弹影响的研究  

Influence of Microstructure on Springback of High Strength Dual-phase Steel Sheet Stamping

作　　者：赵茂俞[1,2] 陈乾旺[2] 田春艳[1] 

机构地区：[1]合肥学院机械工程系,安徽合肥230601 [2]中国科学技术大学化学与材料科学学院,安徽合肥230026

出　　处：《热加工工艺》2014年第3期94-97,共4页Hot Working Technology

基　　金：安徽省教育厅自然科学研究重大项目(KJ2011ZD09);安徽省自然科学基金面上项目(1308085ME77)

摘　　要：高强度双相钢(Dual Phase Steel,DP)板冲压成形的主要缺陷为回弹,而马氏体相是影响回弹的重要因素。把DP600钢试样加热至740℃且保温8 min后水淬,再分别降温至200、260、320℃且保温1 h,以获得多相材料,用U形弯曲模具进行了实际冲压实验。通过SEM测试了钢中马氏体相的体积分数,观察并分析微观组织晶粒形貌;通过拉伸实验,获得了试样的力学性能。分析马氏体体积分数对U形件回弹量的影响,研究了回弹量与铁素体晶粒度的关系。结果表明,马氏体体积分数越大,屈服强度与抗拉强度越高;铁素体晶粒大小对冲压回弹量几乎没有影响。The main defects of high strength dual phase steel （DP） plate in stamping forming are springback. And martensitic phase is an important factor to influence springback. The specimens of DP600 were heated to 740℃ for 8 min, and then water quenched. Temperatures were down to 200, 260, 320℃ respectively holding for 1 h in order to obtain the multi-phase materials. The actual stamping experiments were done by using U-shape bending die. Martensite volume fraction was measured by SEM. The grain morphology and microstructure were observed and analyzed. Mechanical properties were attained through tensile test. Effect of martensite volume fraction on the springback quantity of U-shape part was analyzed. Relationship between the springback quantity and ferrite grain size was investigated. The results indicate that the bigger volume fraction of martensite is, the higher yield strength quantity and tensile strength is; the ferrite grain size has nothing to do with the forming springbak.

关 键 词：高强度双相钢 屈服强度 马氏体 铁素体 回弹 

分 类 号：TG386[金属学及工艺—金属压力加工] TG156