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The role of casting porosity in fatigue properties of Al−Si 319 lost foam cast alloy |
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| Authors: | Yong-Bok Lee Aslak Siljander Frederick V. Lawrence |
| Affiliation: | 1. Department of Mechanical Engineering, Hongik University, Sangsudong, Mapoku, 121-791, Seoul, Korea 2. Department of Materials Science and Engineering, University of Illinois at Urbana Champaign, 208 North Romine Street, 61801-2397, Urbana, Illinois, U.S.A. |
| Abstract: | The tensile, fracture toughness and fatigue properties of Al−Si 319 lost-foam-cast alloy were determined at room temperature. The fatigue properties of this alloy were also determined at 150°C. Fatigue cracks were always initiated at the largest casting pore. Initial pore sizes were measured using a scanning electron microscope. Surface replication showed that majority of the fatigue life was spent in fatigue crack propagation and permitted the estimation of the constants in the Paris power law and the threshold stress intensity factor (ΔK th ). The role of internal casting porosity was quantified using a linear elastic fracture mechanics (LEFM) model for fatigue crack growth. The predicted lives agreed with the measured values within a factor of two. |
| Keywords: | Fatigue Properties Surface Replication Fatigue Life Stress Intensity Factor Casting Porosity |
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