AC3AおよびAC7B合金のTIG溶接継手の組織と機械的性質
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概要
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A weldability test on AC3A (Al-12.5%Si) and AC7B (Al-10%Mg) castings was carried out using 4043 alloy of a filler metal. The weld heat input has little effect on the Na-modified eutectiic structure and impact strength of AC3A. The weld metal having refined eutectic and α-dendritic structures has impact strength twice as high as the modified base metals. The weld joint of AC7B-F castings is remarkably brittle. Toe-cracking often occurs at a heavy heat input. The impact strength of AC7B-T4 weld joints drops in the heat affected zone where grain boundary precipitation occurs considerably. Such a decrease in ductility is attributed not to the precipitation but to GP zone formation accelerated by cyclic heat input.
- 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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