石墨化高碳钢板材的冲压成形性能  

Stamping formability of graphitized high carbon steel sheet

作　　者：张永军[1] 李新鹏 王九花 刘靖[1] 韩静涛[1] ZHANG Yong-jun;LI Xin-peng;WANG Jiu-hua;LIU Jing;HAN Jing-tao(School of Materials Science and Engineering,University of Science and Technology Beijing,Beijing 100083,China)

机构地区：[1]北京科技大学材料科学与工程学院,北京100083

出　　处：《塑性工程学报》2021年第11期18-24,共7页Journal of Plasticity Engineering

基　　金：北京市自然科学基金资助项目(2172035)。

摘　　要：以含碳量为0.66%的石墨化高碳钢板材为研究对象,利用单向拉伸试验和刚性凸模胀形试验对反映板材基本成形性能的力学性能和冲压成形极限进行试验测试,并利用NADDRG模型对该钢的成形极限进行预测。结果显示,试验钢具有较低的屈强比,仅为0.52左右,以及较高的加工硬化指数,为0.24和塑性应变比,为0.8,表明该钢具有一定的冲压成形性能;通过试验测定的成形极限确定了该钢冲压成形时的安全应变区。另外,虽然利用NADDRG模型预测的成形极限高于试验测定的成形极限,但仍表明可对该钢进行冲压成形。因此,本研究采用的石墨化高碳钢板材可用于冲压加工。Taking the graphitized high carbon steel sheet with 0.66%carbon content as the research object,the mechanical properties reflecting basic formability of sheet metal and stamping forming limit were tested by uniaxial tensile test and rigid punch bulging test.The forming limit of the steel was predicted by NADDRG model.The results show that test steel has low yield strength ratio,only about 0.52,high work hardening index of 0.24 and high plastic strain ratio of 0.8,which indicates that the steel has certain stamping formability.The safe strain zone of the steel during stamping was determined by the forming limit measured by test.In addition,the forming limit predicted by NADDRG model is higher than that determined by experiment,but it still shows that the steel can be formed by stamping.Therefore,the graphitized high carbon steel sheet used in this study can be used for stamping.

关 键 词：石墨化高碳钢板材 力学性能 成形极限 单向拉伸试验 胀形试验 

分 类 号：TG386[金属学及工艺—金属压力加工] TG142.14[一般工业技术—材料科学与工程]