HRB400螺纹钢的冷弯断裂

周刚,张家相,蔡晓霞,高长益

物理测试 ›› 2013, Vol. 31 ›› Issue (6) : 36-40.

物理测试 ›› 2013, Vol. 31 ›› Issue (6) : 36-40.
缺陷分析

HRB400螺纹钢的冷弯断裂

  • 周刚,张家相,蔡晓霞,高长益
作者信息 +

Cold Bending Fracture of HRB400 Screw Thread Steel Bar

  • 周刚,张家相,蔡晓霞,高长益
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文章历史 +

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。

Abstract

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, elongation and bending radius decrease that result in fracture during cold-bending process.

关键词

带张力校直 / 屈服消失 / 延伸率减小 / 冷弯断裂

Key words

tensely straighten / yield disappear / extension rate decrease / cold bending fracture

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导出引用
周刚. HRB400螺纹钢的冷弯断裂[J]. 物理测试, 2013, 31(6): 36-40
ZHOU Gang. Cold Bending Fracture of HRB400 Screw Thread Steel Bar[J]. Physics Examination and Testing, 2013, 31(6): 36-40

参考文献

参考文献
[1] 刘永铨.《钢的热处理》.北京:冶金工业出版社,1986,84页
[2] 朱学仪,陈训浩.《钢的检验》,冶金工业出版社,P169.
[3] 宋维锡《金属学》北京:冶金工业出版社,1989,P196~P203页

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