Effect of Microporosity on High Cycle Fatigue Property of A356 Alloy
A356 합금의 고주기 피로특성에 미치는 미소기공율의 영향

Suk-Jong Yoo, Choong-Do Lee
2011 Journal of the Korea Foundry Society  
The present study was aimed to investigate the dependence of fatigue property on microporosity variation of low-pressure diecast (LPDC) A356 alloy. The fatigue property of A356 alloy was evaluated through high cycle fatigue test, and the microporosityterms 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
more » ... 356 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. (37) − 200 −
doi:10.7777/jkfs.2011.31.4.198 fatcat:a7czzynhgbbubihsoziknphkcy