超高强度热轧钢板冷冲压开裂原因及分析  

Crack analysis of super high strength steel plate during cold stamping process

作　　者：赵培林[1,2] 孙新军[1] 雍岐龙[1] 路峰 

机构地区：[1]钢铁研究总院结构材料研究所,北京100081 [2]莱芜钢铁集团技术中心,山东莱芜271104

出　　处：《金属热处理》2012年第7期122-126,共5页Heat Treatment of Metals

摘　　要：针对屈服强度700 MPa级超高强度热轧钢板冷冲压时出现开裂现象,对其剪切加工方式以及剪切材料端部进行了研究。结果表明,剪切端局部加工硬化以及大量残留的微裂纹扩展是700 MPa级热轧超高强钢板冲压产生开裂的主要原因。通过边缘局部回火或局部修磨去除裂纹源,可避免出现开裂或者降低开裂几率。In accordance with crack of 700 MPa （yield strength） grade steel during the cold stamping process, the shear mode and the end of sheared steel were studied. The results show that local work hardening of the end of sheared steel and residual micro-crackle are main reasons that lead to crack with 700 MPa grade steel. The crack can be avoided or the rate of crack can be decreased through tempering with end of sheared steel and edge grinding to eliminate the crack source.

关 键 词：超高强钢 热轧钢带 冷冲压 开裂 加工硬化 微裂纹 

分 类 号：TG142.7[一般工业技术—材料科学与工程]