Effect of Mo Content on the Microstructure and Stress Rupture of a Ni Base Single
MA Wenyou1); HAN Yafang1); LI Shusuo1);ZHENG Yunrong2); GONG Shengkai1)
1) School of Materials Science and Engineering;Beijing University of Aeronautics and Astronautics; Beijing 100083 2) Beijing Institute of Aeronautical Materials; Beijing 100095
Cite this article:
MA Wenyou; HAN Yafang; LI Shusuo; ZHENG Yunrong; GONG Shengkai. Effect of Mo Content on the Microstructure and Stress Rupture of a Ni Base Single. Acta Metall Sin, 2006, 42(11): 1191-1196 .
Abstract Abstract: Ni-base single crystal superalloys were prepared by screw selecting method. And the effects on microstructures and stress rupture properties of three kinds of Mo content superalloys with 2%, 3%, 4% were investigated, separately. The results showed that three as-cast structures of the alloys were composed of γ and γ′ phases. After heat treatment, alloy with 4% Mo content began to precipitate µ phase. The µ phase of alloy with 4% Mo content precipitated abundantly and grew, while alloy with 3% Mo content only a few µ phase and 2% Mo content without µ phase after heat exposure at 1100℃/500h. The µ phase was mainly composed of element Mo, Re, W, Cr, Co, Nb etc., in which the tendency of forming µ phase of Mo was the strongest, Re, W ,Cr took the second place and Co, Nb was the weakest. A lot of precipitation of stick-shaped µ phases damaged high temperature stress rupture properties of alloys. A few µ phase didn’t decrease high temperature stress rupture properties of alloys, on the contrary, improved them due to the solid solution strengthening effect of Mo. Therefore, the optimum Mo content should be 3wt.% for the based composition alloy Ni-5Cr-10Co-4W-3Re-5.6Al-8Ta-1Ti-0.5Nb.
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