高温合金GH163在850℃至室温的气氛热震行为  

Atmosphere Thermal-Shock Behavior of Superalloy GH163 between 850 ℃ and Room Temperature

作　　者：孟志新[1] 成来飞[1] 张立同[1] 梅辉[1] 刘持栋[1] 

机构地区：[1]西北工业大学超高温结构复合材料国防科技重点实验室,陕西西安710072

出　　处：《稀有金属材料与工程》2008年第5期794-797,共4页Rare Metal Materials and Engineering

基　　金：国家973计划项目(2006CB600908)资助

摘　　要：研究了高温合金GH163在850℃至室温不同气氛环境下的热震行为。比较了热震前后合金的力学性能、断口形貌及显微组织。结果表明:高温合金在氩气(Ar/1.00×105Pa)气氛中热震后,其弹性模量、拉伸强度与断面收缩率分别降低了2%、10%和2%,拉伸断裂方式是韧性断裂;在氧气与氩气混合气氛(O2/0.16+Ar/0.84)×105Pa中热震后,其弹性模量、拉伸强度与断面收缩率分别降低了3%、17%和25%,拉伸断裂方式是脆性断裂。晶粒粗化和沿晶氧化导致高温合金在氧气与氩气混合气氛中的抗热震性能低于在氩气中的抗热震性能。Thermal-shock behavior of superalloy GH163 has been studied between 850 ℃ and room temperature in different atmospheres. Mechanical properties, fracture surface and microstructure of the thermally shocked superalloys have been compared with those of as-received superalloy. It is shown that the Young’s modulus, tensile strength and percentage reduction of area for the superalloy thermally-shocked in Ar （1×10^5 Pa） decrease by 2%, 10% and 2%, respectively. The tensile fracture mode is ductile. By contrast, these three values of the thermally shocked superalloy in the mixed atmosphere of O2 （0.16 × 10^5 Pa） and Ar （0.84 × 10^5 Pa） decease by 3 %, 17 % and 25 %, respectively. The tensile fracture mode is brittle with a poorer thermal shock resistance of GH163 due to the grain coarsening and the oxidation along grain boundary in the mixed atmosphere O2 and Ar.

关 键 词：高温合金GH163 热震 力学性能 断口形貌 显微组织 

分 类 号：TG132.32[一般工业技术—材料科学与工程]