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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
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)
