M963合金的显微组织和性能

The microstructure and mechanical properties of M963 cast Ni-base superalloy

研究了Ｍ９６３合金的组织和力学性能。结果表明，Ｍ９６３合金的高温强度较高，但塑性较低；合金的组织主要由γ基本相、细小γ＇析出相、分布在枝晶间的大块γ＋γ＇共晶以及富Ｗ、Ｃｒ、Ｍｏ的Ｍ－６Ｃ和富Ｔｉ、Ｎｂ、Ｗ的ＭＣ碳化物组成：碳化物呈骨架状、针状分布在枝晶内和断续网状分布在晶界和枝晶间。裂纹在碳化物周围形核并沿碳化物与基体的界面扩展。碳化物的形态严重影响合金的性能，晶界和枝晶间的碳化物膜是造成该合金塑性低的根本原因。

The microstructure and mechanical properties of M963 cast Ni-base superalloy have been studied .The results show that the M963 alloy possesses higher high temperature tensile strength ,but lower ductility the microstructure of this alloy mainly contains the γmatrix phase 、fine γ’precipitates、γ+γ’Eutectic structure in the interdendriticegion 、M-6Cyand MC carbides carbides distribute within the grain interior with scri pt-like and acicular morphology and at grain boundary and interdendritic region with carbide film the morphology of carbides deeply effect the mechanical prop erties of the alloy and the carbide film at the grain boundary and interdendriti c region is the main reason which causes the low ductility of the alloy .