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《Heat Treatment Technology and Equipment》 2011-02
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Fracture Analysis of 20MnTiB High Strength Bolt

ZHANG Jian-guo(China Railway Baoji Bridge Group Co.,Ltd.,Baoji Shanxi 721006,China)  
The reason of fracture is analyzed by chemical composition examination,mechanical properties test,microstructure examination,macro and micro observation on the surface of fracture and thread of 20MnTiB high strength bolts.The results show that 1st thread tooth root′s surface defect arising from forming stage of the thread rolling is the primary cause of the break.
【CateGory Index】: TG115
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