几种典型镍基单晶高温合金成分设计的热力学分析

利用热力学计算软件JMatPro和相应的镍基高温合金数据库,研究了几种典型镍基单晶高温合金和GE公司的低Re成分单晶高温合金专利,分析了合金成分设计中与单晶叶片设计、微观组织稳定性以及加工工艺性能密切相关的一系列参数,包括合金的初熔温度、密度、γ'相体积分数、γ/γ'相错配度、TCP相含量、热加工窗口以及糊状区区间等,...

Thermodynamic Analysis in the Design of Several Typical Nickel-based Single-crystal Superalloys

A couple of typical nickel-based single-crystal superalloys and the low Re-containing alloys patented by General Electronics were studied by thermodynamic calculation.Specific properties were derived as parameters for alloy design,including the incipient melting temperature,density,volume fraction of γ′,the γ/γ′ misfit,the TCP fraction,heat treatment window,and the temperature range of mush zone etc..All the thermodynamic properties were estimated using JMatPro and the latest relevant database for nickel-based superalloys.According to requests for single-crystal blade design,γ/γ′ microstructure stability and process-ability,the design criteria reaching the temperature capability of second-generation single-crystal were made.A series of alloys with different contents were designed with reference to low Re-containing patent alloys of GE.The Re-contents were set to 1 wt%.Finally,several kinds of low Re-containing alloys bearing the temperature capability of second-generation nickel-based single-crystal superalloys have been obtained.