Failure Analysis of Cracked Gear Shafts

被引:3
|
作者
Yu, Zhi-wei [1 ]
Xu, Xiao-lei [1 ]
机构
[1] Dalian Maritime Univ, Electromech & Mat Engn Coll, Dalian 116026, Peoples R China
关键词
Gear shaft; Failure analysis; Instantaneous cracking; Inclusion clusters; Decarburization;
D O I
10.1007/s11668-008-9193-y
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Two gear shafts cracked during the fabrication. The cracks are through the grooves associated with the gear teeth and propagated completely across the shaft. Fractography on the cracked teeth indicates that the crack origins are about 3.5 to 4.0 mm from the groove and exhibit pointlike features. Fracture surfaces near the crack origin regions were intergranular, and the fracture appeared to have occurred instantaneously. Metallurgical analysis indicates that decarburization had occurred on the surfaces of the gear shafts, but occurrence of decarburization has no relation to the cracking. Cracking occurred during the carburization-quenching process and originated at a cluster of Al2O2 complex inclusions. The thermal stress produced by quenching drove the cracking process.
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页码:43 / 48
页数:6
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