理化检验-物理分册2018，Vol.54Issue(5)：355-358,367,5.DOI:10.11973/lhjy-wl201805012
铰链梁铰耳断裂原因分析
Cause Analysis on Fracture of Hinge Beam Ears
摘要
Abstract
Hinge beam ears were fractured in the process of use.The fracture reasons for the hinge beam ears were analyzed by macroscopic analysis,chemical composition analysis,mechanical property test,metallographic examination and fracture SEM analysis.The results show that the residual aluminmm content and nitrogen content in the hinge beam were high,and the cooling rate was too slow in the summer,which made the grain boundary embrittlement due to the precipitation of AlN inclusions on the austenite grain boundary.At the same time,a large number of as-cast MnS and Al2O3inclusions on grain boundary also aggravate the grain boundary embrittlement, and the intergranular brittle fracture of the hinge beam occurred in the process of use.关键词
铰链梁/贝壳状断口/AlN夹杂物/残余铝量/沿晶脆性断裂Key words
hinge beam/conchoidal fracture/AlN inclusion/residual aluminum content/intergranular brittle fracture分类
矿业与冶金引用本文复制引用
郭海霞,李慧..铰链梁铰耳断裂原因分析[J].理化检验-物理分册,2018,54(5):355-358,367,5.
