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《Materials for Mechanical Engineering》 2015-09
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Fracture Analysis of Tensioner Fastening Bolts for Automobiles

CHAI Wu-qian;YANG Qiang-yun;YANG Chuan;GAO Guo-qing;CUI Guo-dong;College of Materials Science and Engineering,Southwest Jiaotong University;  
A comprehensive analysis of microstructure,chemical composition,hardness,macro and micro features was carried out to study the fracture reasons of auto tensioner fastening bolts.The results show that excessive extrusion in the thread rolling process led to a lot of micro-cracks in the thread tip and processing defects at the root of threads respectively,which further expanded in the later heat treatment process,and caused the stress concentration and thus reduced the fatigue strength of the material when the bolts were in use.The premature formation of crack source led to fatigue fracture and failure of the bolts.
【Fund】: 中央高校基本科研业务费专项资金资助(A0920502051413-2)
【CateGory Index】: U463.2
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