Metallurgical failure analysis of piston rings

Madan, M and Sujata, M and Raghavendra, K and Bhaumik, SK (2011) Metallurgical failure analysis of piston rings. Project Report. National Aerospace Laboratories, Bangalore, India.

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Fractographic study showed that the steel piston ring has failed by fatigue. The fatigue crack had initiated at one of the outer periphery corners. Examination revealed that at the crack origin regions, there was crack generation in the Cr-layer and chipping-off of coating. The stress raiser thus resulted was responsible for the fatigue crack initiation. The fractographic features on the fracture surfaces of the cast iron piston ring were completely obliterated due to post fracture rubbing. Hence, the mode of fracture could not be identified unambiguously in this case. However, gross failure pattern suggested that failure in this ring was by fatigue. Study showed that the reason for crack initiation in this case was also same as that of the steel ring. The materials of construction of both the rings were found to conform to specifications in terms of composition, microstructure, hardness and Cr-layer thickness. A detailed analysis of the failures is presented in this report and a few recommendations suggested.

Item Type: Monograph (Project Report)
Uncontrolled Keywords: Piston rings;Steel;Cast iron;Fatigue;Surface coating cracks
Subjects: CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User: Ms. Alphones Mary
Date Deposited: 08 Jul 2011 08:16
Last Modified: 08 Jul 2011 08:16

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