Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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Effect of Microporosity on High Cycle Fatigue Property of A356 Alloy

A356 합금의 고주기 피로특성에 미치는 미소기공율의 영향

  • Yoo, Suk-Jong (Material Research Team, Ssangyong Motor Co.) ;
  • Lee, Choong-Do (Metallurgical & Materials Engineering, Inha Technical College)
  • 류석종 (쌍용자동차 재료연구팀) ;
  • 이충도 (인하공업전문대학 금속재료과)
  • Received : 2011.07.11
  • Accepted : 2011.08.15
  • Published : 2011.08.30
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Abstract

The present study was aimed to investigate the dependence of fatigue property on microporosity variation of low-pressure die-cast (LPDC) A356 alloy. The fatigue property of A356 alloy was evaluated through high cycle fatigue test, and the microporosity-terms used were the fractographic porosity measured from SEM observation on fractured surface and the volumetric porosity obtained through the density measurement using Archimedes's principle. The number of cycles to failure of A356 alloys depends obviously upon the variation of fractographic porosity, and can describe in terms of the defect susceptibility which depends on the microporosity variation at a given value of stress amplitude. The modified Basquin's equation was suggested through the combination of microporosity variation and static maximum tensile stress to fatigue strength coefficient. Using modified Basquin's equation, it could suggest that the maximum values of fatigue strength coefficient and exponent achievable in defect-free condition of A356 alloy are 265 MPa, -0.07, respectively.

Keywords

References

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