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Brittle Failure of Hypereutectic Al–Si Alloy Component

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Abstract

The paper describes the failure analysis of a fractured pneumatic actuator cover plate of a turbine outlet valve of a shutdown cooling pump in a research reactor. The material of construction for the cover plate was a hypereutectic Al–Si alloy in as-cast condition. Microstructural examination of the failed plate was done using both optical and scanning electron microscopy. The microstructure consisted of needle-shaped primary silicon and Fe-rich intermetallic phases in an aluminum matrix. The microstructure also consisted of numerous shrinkage pores along the interdendritic regions. Based on microstructural and fractographic examinations, it was concluded that the cover plate had fractured due to impact loading. Acicular morphology of silicon and intermetallic phases together with high porosity greatly reduce the fracture toughness of Al–Si alloy.

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References

  1. M. Warmuzek, Aluminum–silicon casting alloys: atlas of microfractographs, 1st edn. (ASM international, Materials Park, OH, 2004)

    Google Scholar 

  2. H. Ye, An overview of the development of Al–Si-alloy based material for engine applications. J. Mater. Eng. Perform. 12, 297–299 (2003)

    Article  Google Scholar 

  3. Z. Li, A.M. Samuel, F.H. Samuel, C. Ravindran, H.W. Doty, S. Valtierra, Parameters controlling the performance of AA319-type alloys Part II. Impact properties and fractography. Mater. Sci. Eng. A 367, 111–122 (2004)

    Article  Google Scholar 

  4. ASM, Properties and Selection: Nonferrous Alloys and Special-Purpose Materials, vol. 2, 10th edn., ASM Metals Handbook (ASM International, Metals Park, 1990)

    Google Scholar 

  5. M. Merlin, G.L. Garagnani, Mechanical and microstructural characterization of A356 castings realized with full and empty cores. Metall. Sci. Technol. 27–21, 21–30 (2009)

    Google Scholar 

  6. S. Seifeddine, I.L. Svensson, The influence of Fe and Mn content and cooling rate on the microstructure and mechanical properties of A380-die casting alloys. Metall. Sci. Technol. 27–1, 11–20 (2009)

    Google Scholar 

  7. C.W. Onyia, B.A. Okorie, S.I. Neife, C.S. Obayi, Structural modification of sand cast eutectic Al–Si alloys with sulfur/sodium and its effect on mechanical properties. World J. Eng. Technol. 1, 9–16 (2013)

    Article  Google Scholar 

  8. A.K. Dahle, K. Nogita, S.D. McDonald, C. Dinnis, L. Lu, Eutectic modification and microstructure development in Al–Si alloys. Mater. Sci. Eng. A 413–414, 243–248 (2005)

    Article  Google Scholar 

  9. M.A. Suarez, I. Figueroa, A. Cruz, A. Hernandez, J.F. Chavez, Study of the Al–Si–X system by different cooling rates and heat treatment. Mater. Res. 15, 763–769 (2012)

    Article  Google Scholar 

  10. T.O. Mbuya, B.O. Odera, S.P. Ng’ang’a, Influence of iron on castability and properties of aluminum silicon alloys: literature review. Int. J. Cast Met. Res. 16, 451–465 (2003)

    Google Scholar 

  11. J.A. Taylor, G.B. Schaffer, D.H. StJohn, The role of iron in the formation of porosity in Al–Si–Cu-based casting alloys: Part I. Initial experimental observations. Metall. Mater. Trans. A 30, 1643–1650 (1999)

    Article  Google Scholar 

  12. S. Nasrazadani, L. Reyes, Failure analysis of Al 356-T6 clutch lever. J. Fail. Anal. Prev. 12, 24–29 (2012)

    Article  Google Scholar 

  13. Z. Yu, X. Xu, H. Yu, Fracture analysis of blade of an integrated compressor impeller. J. Fail. Anal. Prev. 13, 320–327 (2013)

    Article  Google Scholar 

  14. M. Mansoor, N. Ejaz, A. Tauqir, Second phase structure effect to the failure of an Al–Si casting. Eng. Fail. Anal. 16, 1549–1553 (2009)

    Article  Google Scholar 

  15. K. Chandra, Vivekanand Kain, Welding failure of as-fabricated component of aluminum alloy 5052. Eng. Fail. Anal. 34, 387–396 (2013)

    Article  Google Scholar 

  16. F. Paray, B. Kulunk, J.E. Gruzleski, Impact properties of Al–Si foundry alloys. Int. J. Cast Met. Res. 13, 17–37 (2000)

    Google Scholar 

  17. A. Ma, K. Suzuki, N. Saito, Y. Nishida, M. Takagi, I. Shigematsu, H. Iwata, Impact toughness of an ingot hypereutectic Al-23 mass% Si alloy improved by rotary-die equal-channel angular pressing. Mater. Sci. Eng. A 399, 181–189 (2005)

    Article  Google Scholar 

  18. M.F. Ibrahim, E. Samuel, A.M. Samuel, A.M.A. Al-Ahmari, F.H. Samuel, Impact toughness and fractography of Al-Si-Cu-Mg base alloys. Mater. Des. 32, 3900–3910 (2001)

    Article  Google Scholar 

  19. G. Fu, F. Lv, Q. Li, Z. Chai, Cracking of through-hole in intermediate casing flange. J. Fail. Anal. Prev. 11, 557–562 (2011)

    Article  Google Scholar 

  20. R. Kotschi, and C. Loper, Grain refinement in cast aluminum alloys. Paper 113, Trans. AFS (1977)

  21. R. Sharma, A. Kumar, D.K. Dwivedi, Influence of solution temperature on microstructure and mechanical properties of two cast Al-Si alloys. Mater. Manuf. Process 21, 309–314 (2006)

    Article  Google Scholar 

  22. Z. Zhang, H.T. Li, I.C. Stone, Z. Fan, Refinement of primary Si in hypereutectic Al-Si alloys by intensive melt shearing. The 3rd International Conference on Advances in Solidification Processes, IOP Conference Series: Materials Science and Engineering, vol. 27 (2011), p. 012042

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  1. Materials Science Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400 085, India

    K. Chandra & Vivekanand Kain

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  1. K. Chandra
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  2. Vivekanand Kain
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Correspondence to K. Chandra.

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Chandra, K., Kain, V. Brittle Failure of Hypereutectic Al–Si Alloy Component. J Fail. Anal. and Preven. 15, 679–685 (2015). https://doi.org/10.1007/s11668-015-9996-6

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  • DOI: https://doi.org/10.1007/s11668-015-9996-6

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