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Journal of Failure Analysis and Prevention

, Volume 8, Issue 6, pp 509–514 | Cite as

Fractographic and Metallographic Study of Spalling Failure of Steel Straightener Rolls

  • G. Pantazopoulos
  • A. Vazdirvanidis
Case History---Peer-Reviewed

Abstract

Spalled fragments from work rolls of a steel bar straightening machine were received for failure analysis. Visual inspection coupled with optical and scanning electron microscopy (SEM) were used as the principal analytical techniques for the investigation. Fractographic observations clearly revealed the presence of a characteristic fatigue crack propagation pattern (beach marks) and radial chevron marks indicating the occurrence of final overload through a brittle intergranular fracture mode. The collected evidence suggests strongly that surface-initiated cracks propagated by fatigue mechanism led to spalling, resulting therefore in severe work roll damage and subsequently high machine downtime and maintenance costs.

Keywords

Spalling Fatigue Beach marks Fractography 

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Copyright information

© ASM International 2008

Authors and Affiliations

  1. 1.ELKEME Hellenic Research Centre for Metals S.A.AthensGreece

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