Ni基焼結超合金に関する研究(第6報) : クリープ特性に及ぼす組織因子について

概要

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Effect of microstructure on the creep properties of nickel base superalloys, IN-100 and Merl-76, prepared by following three methods was investigated at 1005K. 1) Swaging after liquid phase sintering due to incipient melting of alloy powder. 2) HIPing of alloy powder. 3) Casting. The results obtained were as follows: (1) Fine y-grain IN-100 was obtained by swaging after liquid phase sintering. The creep rupture lives of fine v-grain IN-100 (32 and 62 um) by swaging were longer than that of cast IN-100 (700 um). (2) When y-grain size of swaged IN-100 after liquid phase sintering was equivalent to that of HIPed IN-100, steady state creep rate of those alloys was equal. However, creep rupture ductility of HIPed IN-100 was smaller than that of swaged IN-100. (3) Steady state creep rates (e) of IN-100 and Merl-76 were dependent on their y-grain sizes. s of Merl-76 was smaller than that of IN-100 when y-grain sizes of both alloys were equivalent.
社団法人粉体粉末冶金協会の論文