第四代粉末高温合金成分选取范围研究

STUDY ON COMPOSITION VARIATION RANGE OF THE FOURTH GENENRATION PM SUPERALLOYS

在综合分析第一至三代粉末高温合金发展思路并借鉴叶片合金的基础上,从高强度、高损伤容限和高工作温度要求出发,围绕固溶强化、沉淀强化和晶界强化,研究并确定了第四代粉末高温合金的成分选取范围：①γ ＇相形成元素Al＋Ti＋Ta＋Nb≈9％～15％;②固溶强化元素Cr＋Co＋Mo＋W≈30％～40％;③TCP相形成元素Cr＋Mo＋W≤20％;④一定量晶界强化元素（C、B、Zr、Hf）.

The study of the fourth generation PM superalloys was performed to develop compositions that exhibit required integration of significantly high strength,high damage tolerance and high-temperature capability.Based on the integrated analysis of the development of the first,second and third generation PM superalloys as well as superalloys for blade applications,the study was carried out primarily following the mechanisms of solution strengthening,precipitation strengthening and grain boundary strengthening.Finally,the composition variation range of the fourth generation PM superalloys was determined as：① the mass ratio of gamma prime forming elements Al＋Ti＋Ta＋Nb is 9％～15％; ② the mass ratio of solution strengthening elements Cr＋Co＋Mo＋W is 30％～40％; ③ the mass ratio of TCP formers Cr＋Mo＋W is not more than 20％ ; ③ a certain amount of grain boundary strengthening elements C,B,Zr and Hf.