AC4CHアルミニウム合金鋳物の衝撃引張特性におよぼすDASと欠陥の影響

概要

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Although the dendrite arm spacing (DAS) seems to be a key parameter for mechanical properties of AC4CH aluminum casting alloy, it has not sufficiently been clarified. Especially, the relationship between impact tensile characteristics and DAS and the casting defect related to DAS has not been understood qualitatively. In this study, the influence of DAS on impact tensile properties of AC4CH aluminum casting alloy is investigated by means of a direct tension version of the split Hopkinson bar equipment. The effect of DAS on tensile properties is examined using the specimen which removed the defects by HIP treatment, and the effect of the defects is examined using the specimen with the defect without HIP treatment. As results, it can be confirmed that the tensile strength at high strain rates is linearly decreased with the increase in DAS. It is also found that the tensile strength and the elongation at high strain rates are drastically lowers in over 3% of defect area ratio.
社団法人日本機械学会の論文
2004-02-25