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| Failure Analysis on Fracture of 20CrMnTi Cam Shaft |
| GONG Min-li |
| Department of Mechanical Engineering, Hengyang Financial and Industrial Vocational-Technical College, Hengyang 421008, Hunan, China |
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Abstract During the experiment in the host plant, big and small key slot of 20CrMnTi cam shaft were fractured. Chemical analysis on fracture position of cam shaft, optical microscopy and scanning electron microscopy analysis on the microstructure and crack shape, hardness test of the cam shaft big key slot cross section and small key slot cross section were carried out. The results show that the chemical composition, microstructure and hardness are all in accordance with the requirements of the related technical standard. Big crack originated from the slot bottom, accumulated and led to final fracture. Obvious wear occurred at the position of conical degree, indicating the maximum loading there. Small crack originated from the slot bottom and no significant expansion area occured, so it belongs to the instantaneous fracture. At both of the keyway bottoms there are no obvious chamfer, which increases the tendency of stress concentration, and thus results into the fracture of cam shaft.
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Received: 09 April 2013
Published: 17 April 2014
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2014, Vol. 32 
