Cracking Failure Analysis of Cr12MoV Steel Guide Roller

Yuan Li; Gang Yang; Yi Yang; Yi Chen; Shu Lin Huang

doi:10.4028/www.scientific.net/AMR.1033-1034.818

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 1033-1034Cracking Failure Analysis of Cr12MoV Steel Guide...

Cracking Failure Analysis of Cr12MoV Steel Guide Roller

Abstract:

A failure case of the Cr12MoV steel guide roller is presented in this paper. Many net cracks were distributed on the surface and both ends of guide roller had been oxidized to black seriously. The failure analysis was performed in terms of macroscopic observation, fracture scanning electron microscope (SEM), energy spectrum, metallographic analysis and hardness test, etc. The results show that a large number of casting defects, such as holes and inclusions, exist inside of the guide roller, which could be considered as crack source under the effect of alternating load; and then the crack source constantly grows and expands along the vulnerable region-grain boundary when the guide roller bears cold and hot effects repeatedly, resulting in large stress existing on the surface; finally fatigue intergranular cracks are formed which lead to guide roller cracking failure.

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Periodical:

Advanced Materials Research (Volumes 1033-1034)

Pages:

818-823

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.1033-1034.818

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Online since:

October 2014

Authors:

Yuan Li, Gang Yang*, Yi Yang, Yi Chen, Shu Lin Huang

Keywords:

Failure Analysis, Fatigue Cracks, Guide Roller

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* - Corresponding Author

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