Ａｌ‐Ｓｉ‐Ｃｕ‐Ｍｇ合金鋳物の疲労特性に及ぼす鋳造欠陥とＦｅ系化合物の影響
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概要
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In order to clarify the effect of casting microstructures on fatigue properties of Al–9%Si–1.6%Cu–O.55%Mg alloy castings, the fatigue properties of non-degassing castings, degassed castings and HIPed castings with different size of microstructures were examined. Elongation and fatigue property increase remarkably with decreasing of gas quantity in melt. Gas porosity affect not only crack origins but crack growth paths. In HIPed castings, Fe compounds, which have needle-like shape affect as crack origins. However, in the castings with finer microstructure, decreasing with size and aspect ratio of compounds, capability for crack origin is reduced, and the scatter of fatigue strength occurs by crystal growth direction of Fe compounds. In castings with larger microstructures, Fe compounds with larger size and aspect ratio decrease fatigue property significantly in any growth direction.
- 一般社団法人 軽金属学会の論文
一般社団法人 軽金属学会 | 論文
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