Browse > Article
http://dx.doi.org/10.5228/KSPP.2009.18.4.296

Effect of Porosity on the High-Cycle Fatigue Behavior of Al-Si-Mg Casting Alloy  

Lee, Young-Jae (안동대학교 신소재공학부 청정소재연구센터)
Kang, Won-Guk (안동대학교 신소재공학부 청정소재연구센터)
Euh, Kwang-Jun (한국기계연구원 신금속재료연구부)
Cho, Kyu-Sang (동양대학교 철도차량학과)
Lee, Kee-Ahn (안동대학교 신소재공학부)
Publication Information
Transactions of Materials Processing / v.18, no.4, 2009 , pp. 296-303 More about this Journal
Abstract
The effect of porosity on the high-cycle fatigue properties of Al-Si-Mg casting aluminum alloys was investigated in this study. Microstructure examination, tensile and high-cycle fatigue test were conducted on both Al-Si-Mg casted (F) and heat-treated (T6) conditions. Porosity characteristics on the fracture surfaces of fatigue-tested samples were examined using SEM and image analysis. The microstructure observation results showed that eutectic Si particles were homogeneously dispersed in the matrix of the Al-Si-Mg casting alloys, but there were porosities formed as cast defects. The high-cycle fatigue results indicated that the fatigue strength of the 356-T6 alloy was higher than that of the 356-F alloys because of the significant reduction in volume fraction of pores by heat treatment. The SEM fractography results showed that porosity affected detrimental effect on the fatigue life: 80% of all tested samples fractured as a result of porosity which acted as the main crack initiation site. It was found that fatigue life decreased as the size of the surface pore increased. A comparison was made between surface pore and inner pore for its effect on the fatigue behavior. The results showed that the fatigue strength with the inner pores was higher than that of the surface pore.
Keywords
Al-Si-Mg Alloy; 356-F Alloy; 356-T6 Alloy; Heat Treatment; High Cycle Fatigue; Pore Size; Pore Distribution;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
연도 인용수 순위
1 C. H. Caceres, C. J. Davidson, J. R. Griffiths, 1995, The deformation and fracture behaviour of an Al-Si-Mg casting alloy, Mater. Sci. Eng. A, Vol. 197, No. 2, pp. 171-179   DOI   ScienceOn
2 James A. Wasynczuk, W. Dave Hanna, Franklin D. Ross, Thomas A. Freitag, 1994, High-cycle fatigue of Kovar, Fatigue of Electronic Materials., pp. 110-122
3 M. Deters and J.C. Williams, 1984, Metall. Trans. A, Vol. 15A, p. 1588
4 K. Gall, N. Yang, M. Horstemeyer, D. L. Mcdowell, J. Fan, 1999, Metal. Mater. Trans., Vol. 30A, No.12, p. 3079
5 M. J. Couper, A. E. Neeson, J. R. Griffith, 1990, Casting Defects and the Fatigue Behavior of an Aluminium Casting Alloy, Fatigue Fract. Eng. Mater. Struct., Vol. 13, pp. 213-227   DOI
6 Y. H. Kim, S. Lee, N. J. Kim, D. Y. Lee, 1991, J. Kor. Inst. Met. & Mater., Vol. 29, p. 112
7 B. Zhang, D. R. Poirer, W. Chen, 1999, Microstructural effects on high-cycle fatigue-crack initiation in 356.2 casting alloy, Metal. Mater. Trans. Vol. 30, No. 10, pp. 2659-2666   DOI
8 Sang-Won Han, Sug-Won Kim, 2002, Fatigue Behaviors in Aluminum Cast Alloys, J. Kor. Foundrymen's Soc 22, Vol. 2, pp. 61-68
9 S. U. ihara, 1991, Pros. Of Int. Conf. in recent Advances in Science and Engineering of Light Matals, Tokyo, p. 1163
10 T. Kashyap, S. Murali, K. S. Raman, K. S. S. Murthy, 1993, Casting and heat treatment variable of Al–7Si–Mg alloy, Mater. Sci. Technol., Vol. 9, No. 3, pp. 189-203   DOI   ScienceOn
11 J. H. Kim, Evgenij Barsoukov, C. O. Yoon, Housll Lee, 1998, 7Li NMR Study of Li Intercalated Carbons Prepared by Electrochemical Method, J. Kor. Foundrymen's Soc., Vol. 18, pp. 297-302   과학기술학회마을
12 C. H. Caceres, 1995, On the effect of macroporosity on the tensile properties of the Al-7%Si-0.4%Mg casting alloy, Scripta Metall., Vol. 32, No. 11, pp. 1851-1856   DOI   ScienceOn
13 C. H. Caceres, B. I. Selling, 1996, Casting defedcts and the tensile properties of an Al-Si-Mg ally, Mater. Sci. Res. Eng., Vol. 22, No. 1-2, pp. 109-116   DOI   ScienceOn
14 Q. G. Wang, D. Apelian, D. A. Lados, 2001, Fatigue behavior of 356-T6 aluminum cast alloys. Part I. Effect of casting defects, J. Light. Met., 1, pp. 73-84   DOI   ScienceOn
15 H. R. Ammar, A. M. Samuel, F. H. Samuel, 2008, Effect of casting imperfections on the fatigue life of 319-F and 356-T6 Al-Si casting alloys, Mater. Sci. Res. Eng., Vol. 473, No.1-2, pp. 65-75   DOI   ScienceOn
16 ASTM E466, Annual Book of ASTM Standards, 1996, Section 3, Vol. 3, p. 465
17 G. Gustafesson, T. Thorvaldesson, G. L. Dumlo, 1986, The influence of Fe and Cr on the microstructure of cast Al-Si-Mg alloys, Metall trans., Vol. 17, pp. 45-52   DOI   ScienceOn
18 Aluminum: The Corrosion Resistant Automotive Material, The Aluminum Association, Inc., 2001, p. 6
19 P. R. Goulart, J. E. Spinelli, W. R. Osorio, A. Garcai, 2006, Mechanical properties as a function of microstructure and solidification thermal variables of Al–Si castings, Mater. Sci. Eng. Vol. 421, No.1-2, pp. 245-253   DOI   ScienceOn
20 W. S. Miller, L. Zhuang, J. Bottema, A. J. Wittebrood, P. De Smet, A. Hazler, A. Vieregge, 2000, Recent development in aluminium alloys for the automotive industry, Mater. Sci. Res. Eng., Vol. 280, No. 1, pp. 37-49   DOI   ScienceOn
21 H. W. antes, H. Markus, 1970, Mat. Sci. Quart, Vol. 10, p. 9
22 Hayashi H, Nakagawa T, 1994, Recent trends in sheet metals and their formability in manufacturing automotive panels, J. Mater. Proc. Tech., Vol. 46, pp. 455-487   DOI   ScienceOn
23 Ashley. S, 1997, Steel cars face a weighty decision, Mech. Eng., Vol. 119, pp. 56-61