Microstructure and stress-rupture property of an experimental single crystal Ni-base superalloy with different heat treatments  

作　　者：Jing-Yang Chen La-Mei Cao Ming Xue Li-Jun Liu 

机构地区：[1]Science and Technology on Advanced High Temperature Structural Materials Laboratory, Beijing Institute of Aeronautical Materials

出　　处：《Rare Metals》2014年第2期144-148,共5页稀有金属（英文版）

基　　金：financially supported by the National Basic Research Program of China (No. 2010CB631202)

摘　　要：The influence of heat treatment on the microstructure and stress-rupture property at 1,100 °C/140 MPa was investigated in a 5.0 wt% Re containing experimental single crystal Ni-base superalloy. The results indicate that the γmorphology is nearly cuboidal in the dendrite core after conventional heat treatment. The lattice misfit of alloy becomes more negative after modified heat treatment and results in more cuboidal γ precipitates than that after conventional heat treatment. The increased stress-rupture life after modified heat treatment is attributed to higher γ volume fraction, more negative lattice misfit, well-rafted structure, and narrower c channel width.The influence of heat treatment on the microstructure and stress-rupture property at 1,100 °C/140 MPa was investigated in a 5.0 wt% Re containing experimental single crystal Ni-base superalloy. The results indicate that the γmorphology is nearly cuboidal in the dendrite core after conventional heat treatment. The lattice misfit of alloy becomes more negative after modified heat treatment and results in more cuboidal γ precipitates than that after conventional heat treatment. The increased stress-rupture life after modified heat treatment is attributed to higher γ volume fraction, more negative lattice misfit, well-rafted structure, and narrower c channel width.

关 键 词：Superalloy Heat treatment γprecipitate Lattice misfit Stress-rupture property 

分 类 号：TG132.33[一般工业技术—材料科学与工程]