HRB400螺纹钢的冷弯断裂  

Cold Bending Fracture of HRB400 Screw Thread Steel Bar

作　　者：周刚[1] 张家相[1] 蔡晓霞[1] 高长益[1] 

机构地区：[1]首钢水城钢铁(集团)有限责任公司技术中心,贵州六盘水553028

出　　处：《物理测试》2013年第6期36-40,共5页Physics Examination and Testing

摘　　要：通过对断裂钢筋化学成分的分析,断口形貌的观察,金相组织的检验,结合试样外观及力学性能检验,对比了送检试样的力-位移图,确定了HRB400螺纹钢的冷弯断裂是因带张力矫直致使钢材屈服消失,伸长率减小,变相减小了钢材弯曲时的弯心直径,最终导致其在冷弯过程中发生断裂。By analyzing the chemical composition, observing the fracture morphology and micnostructure as well as the fracture sample appearance, measuring the mechanical properties and comparing the force-displacement figures, the cause of fracture of HRB400 rebar can be confirmed that the tensely-straightening made the yield disappear, e longation and bending radius decrease that result in fracture during cold-bending process.

关 键 词：带张力矫直 屈服消失 伸长率 冷弯断裂 

分 类 号：TG115[金属学及工艺—物理冶金]