Journal of Failure Analysis and Prevention

, Volume 15, Issue 3, pp 424–429 | Cite as

Microstructural Analysis of the Failure of a Cast Iron Cylinder Head of a Thermoelectrical Plant Motor

  • Cassio Barbosa
  • Ibrahim de Cerqueira Abud
  • Tatiana Silva Barros
  • Sheyla Santana de Carvalho
Technical Article---Peer-Reviewed
  • 124 Downloads

Abstract

Large motors, such as those that propel ships or generate energy for thermoelectrical plants, for instance, use cylinder heads produced with nodular cast iron. Such components are manufactured by a casting process which must be strictly controlled to prevent the appearance of defects that may spoil the performance of the component in service. When these defects arise, they usually lead to the failure of the cylinder head, mainly causing fluids leakage that can harm or even impede the motor performance. In this study, the microstructure of the material was characterized, with the purpose of investigating the possible causes of the failure, through the use of techniques such as optical microscopy and scanning electron microscopy. Brinell hardness tests were also performed. The results revealed that inadequate casting procedures probably caused the defects and subsequent failure of the cylinder head.

Keywords

Casting iron Failure analysis Microscopy 

Notes

Acknowledgments

The authors would like to thank Rafael de Abreu Vinhosa for sample preparation, Ricardo Silva Tavares Mello for helpful information about motor mechanics, and CENANO/INT for SEM images. CNPq (Brazilian Council for Scientific and Technological Development) and FAPERJ (Research Funding Agency of Rio de Janeiro) must be acknowledged for financial support.

References

  1. 1.
    D. Woodyard, Pounders Marine Diesel, 9th edn. (Elsevier, Burlington, 2009), 896 pGoogle Scholar
  2. 2.
    ASM Handbook. Properties and Selection: Irons. Steels and High-Performance Alloys, vol. 1 (ASM International, Materials Park, OH, 1990), 6th Printing 2001Google Scholar
  3. 3.
    R. Elliott, Cast Iron Technology (Butterworth-Heinemann, London, 1988), p. 240Google Scholar
  4. 4.
    V. Kondic. Metallurgical Principles of Founding (Edward Arnold Publishers Ltd., London, 1968), 286pGoogle Scholar
  5. 5.
    P.R. Beeley, Foundry Technology (Butterworths, London, 1972), p. 544Google Scholar
  6. 6.
    L. Zhang, Inclusion and bubble in steel—a review. J. Iron Steel Res. Int. 13(3), 1–8 (2006)CrossRefGoogle Scholar
  7. 7.
    R. Wouters, L. Froyen, Scanning electron microscope fractography in failure analysis of steels. Mater. Charact. 36, 357–364 (1996)CrossRefGoogle Scholar
  8. 8.
    ASM Handbook. Failure Analysis and Prevention, vol. 11 (ASM International, Materials Park, OH, 2004), 1164 pGoogle Scholar
  9. 9.
    SAE J434 Standard, Automotive Ductile (Nodular) Iron Castings, 2004Google Scholar
  10. 10.
    ASTM E3, Standard Guide for Preparation of Metallographic Specimens, 2011Google Scholar
  11. 11.
    ASTM E407, Standard Practice for Microetching Metals and Alloys, 2007Google Scholar
  12. 12.
    ISO 6506-1 Standard, Metallic Materials—Brinell Hardness Test —Part 1: Test Method, 2005Google Scholar

Copyright information

© ASM International 2015

Authors and Affiliations

  • Cassio Barbosa
    • 1
  • Ibrahim de Cerqueira Abud
    • 1
  • Tatiana Silva Barros
    • 1
  • Sheyla Santana de Carvalho
    • 1
  1. 1.Instituto Nacional de Tecnologia (INT)Rio de JaneiroBrazil

Personalised recommendations