高强度双相钢弯曲的微观组织形变与回弹机理研究  

Study of Microstructure and Spring Back Mechanism of High Strength Dual-phase Steel During Bending Plastic Deformation

作　　者：赵茂俞[1,2] 陈乾旺[2] 

机构地区：[1]合肥学院机械工程系,安徽合肥230022 [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》2012年第15期4-7,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);合肥学院引进人才科学研启动基金项目(10RC02)

摘　　要：高强度双相钢冲压成形的主要缺陷是回弹。而金属塑性变形的微观组织形变可以揭示变形回弹机理。通过单向拉伸实验,获得材料力学性能参数;计算V形弯曲变形的应力分布,并进行实际弯曲。为此,研究了大塑性变形的微观组织形貌以及微观组织流动性与应力分布的对应关系。结果表明,弯曲圆弧内区层的塑性流动性优于外区层,对回弹的影响大于外区层。研究结果为控制高强度双相钢冲压回弹量提供一定的理论基础与方法。The main defect is springback during high strength dual-phase steel pressing forming. Metal springhack mechanism can be revealed by microstructure deformation. Material mechanics property parameters were attained with tensile test. Calculating stress distribution of V-shape parts, those were bent by cold stamping die. So, mierostructure morphologies and the corresponding relation between flow characteristic and stress were studied on condition of big plastic deformation. The results prove that the plastic flow property of arc internal surface layer is better than arc extemars, and its influence on spring back exceeds arc external surface layer. These can afford theory foundation and method to control spring back during high strength dual-phase steel forming.

关 键 词：高强度双相钢 弯曲应力 微观组织特征 回弹 

分 类 号：TG386[金属学及工艺—金属压力加工]