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Journal of Failure Analysis and Prevention

, Volume 11, Issue 4, pp 337–343 | Cite as

Failure Analysis of a Cylindrical Roller Bearing from a Rolling Mill

  • Goutam Mukhopadhyay
  • S. Bhattacharya
Case History---Peer-Reviewed

Abstract

Premature failure of a cylindrical roller bearing of a gear box input shaft from a hot strip mill has been investigated. The pins of the cylindrical rollers of the bearing broke from the welded joints at their ends on the cage ring. Investigations were carried out on the failed roller pin and the welded joint. The investigation consists of visual observation, chemical analysis, characterization of macro- and microstructures, measurement of hardness profile, fractography, and energy dispersive spectroscopy (EDS). The fracture surface of the roller pins exhibits beach marks. Scanning electron microscopy (SEM) of the fracture surfaces reveals striations suggesting fatigue failure. The measured hardness profile along the welded joint shows very high hardness due to the presence of untempered martensite at the fusion boundary as revealed by the microstructural examination. Analyses of the results infer that the roller pins failed by the initiation of fatigue cracks from the welded joint because of the presence of untempered martensite originated due to improper welding process.

Keywords

Bearing Hot strip mill Weld joint Microstructure EDS 

References

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    Totemeier, T.C., Simpson, J.A., Tian, H.: Effect of weld intercooling temperature on the structure and impact strength of ferritic–martensitic steels. Mater. Sci. Eng. A 426, 323–331 (2006)CrossRefGoogle Scholar
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    Failure analysis and prevention, In: Metals Handbook, vol. 10, 8th edn., p. 343. ASM International, Metals Park, OH (1971)Google Scholar

Copyright information

© ASM International 2011

Authors and Affiliations

  1. 1.Metallurgical Laboratories and QA Group, R&D and Scientific ServicesTata Steel Ltd.JamshedpurIndia

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