组织结构对Ni-20Cr-10Mo-10Co高温合金高温力学性能的影响  

Effect of Microstructure on High Temperature Mechanical Properties in Forming Ni-20Cr-10Mo-10Co Superalloy

作　　者：顾家琳[1] 郭彦宏[1] 贾崇林[2] 施惠基[1] 

机构地区：[1]清华大学,北京100084 [2]首钢冶金研究院,北京100085

出　　处：《稀有金属材料与工程》2003年第2期103-107,共5页Rare Metal Materials and Engineering

基　　金：国家重点基础研究专项经费资助(19990650)

摘　　要：Ni-20Cr-10Mo-10Co高温合金是一种以碳化物为主要强化相的铸造高温合金。合金的晶粒尺寸和枝晶间距,随着模壳温度的降低而减小,在使用温度为800℃时合金中碳化物的类型发生变化。另外,实验发现随着模壳温度的降低,合金在800℃,165MPa时的持久寿命和蠕变性能都得到改善,持久拉伸试样为穿晶准解理断口。表明这种材料的等强温度在800℃以上,所以晶粒、枝晶的细化有利于高温力学性能的提高。Ni-20Cr-10Mo-10Co superalloy is a casting superalloy strenghted by carbides. With mold temperature dropping the grain-size and interdendritic space of alloy decrease. At the working temperature of 800 degreesC, the type of carbides was changed. In addition, it was shown that rupture life capability and creep capability of the alloy under the condition of 800 degreesC and 165MPa have been improved with mold temperature dropping. The fracture of rupture tensile sample is pseudo-cleavage transcrystalline fracture. It is demonstrate that isochronal-strength temperature of the material is over 800 degreesC, therefore, the grain-size and interdendritic refined lead to improve high temperature mechanical properties.

关 键 词：镍基高温合金 高温持久寿命 蠕变 晶粒尺寸 枝晶间距 组织结构 

分 类 号：TG132.32[一般工业技术—材料科学与工程]