【作者】 翟红波； 董雷云； 施哲雄； 蒋晓东；

【Author】 Zhai Hongbo Dong Leiyun Shi Zhexiong Jiang Xiaodong (School of Mechanical & Power Engineering,East China University of Science & Technology Shanghai 200237)

【机构】 华东理工大学机械与动力工程学院；

【摘要】 通过对施焊时开裂的20钢弯头试样的裂纹宏观形貌观察、材料的化学成分分析、力学性能测试、断口分析、金相检验等理化检验,并结合弯头的热推加工工艺进行失效分析。结果表明,该弯头产品存在原始裂纹,本次施焊过程造成贯穿性裂纹是由于原始裂纹受热扩展所导致的二次开裂。更多还原

【Abstract】 Failure analysis is made by observation of macroscopic profile of the crack on the 20 steel bend specimen occurring during the welding process,chemical composition analysis of the material,test of mechanical properties,fracture analysis,metallographic examination,etc.and in combination with hot-push forming process. The results show that there is original crack in this bend product before welding,the occurrence of penetrating crack appearing in the welding process is due to the secondary cracking resulting from propagation of the original crack due to heating.更多还原