真空焼結後ＨＩＰ処理したＴｉ‐１３％Ｖ‐１１％Ｃｒ‐３％Ａｌ合金の引張性質
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The relationship between the microstructures and tensile properties has been investigated for the vacuum sintered and the vacuum sintered plus HIP'ed Ti–13 mass%V–11 mass%Cr–3 mass%Al alloy, which is the basic material of practically used β–type titanium alloy. They were produced by blending a pure titanium powder, a pure vanadium powder, a pure chromium powder and an Al–42 mass%V alloy powder. The microstructures of the vacuum sintered material and the HIP'ed material consist of equiaxed grain and that of HIP'ed at the temperature near to the β transus becomes finer than the vacuum sintered material. In the materials HIP'ed at the temperatures below the β transus a larger amount of α phase precipitates is observed than in the vacuum sintered materials and the materials HIP'ed at the higher temperatures above the β transus. This tendensy is notable in the low temperature HIP'ed materials after high temperature vacuum sintering. The low temperature HIP'ed materials with many α precipitates show the higher values of the 0.2% proof stress and ultimate tensile strength comparing with the high temperature HIP'ed materials but the ductility is excellent for the high temperature HIP'ed materials. The ductility of the low temperature HIP'ed materials having ununiform α precipitates is lower than the vacuum sintered material. The high strength is obtained but the ductility decreases remarkably by aging the as-HIP materials for the shorter time compering with the ingot material.
- 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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