摘要
研究了热处理对GH141合金760℃拉伸及900℃/170MPa持久性能的影响及合金显微组织与高温力学性能之间的关系。结果表明,GH141合金的760℃屈服强度σ7600.2与晶粒平均直径D之间仍符合Hall-Petch关系;γ′强化机制可用位错切绕转换模型描述;晶界碳化物的种类、数量和尺寸对合金的持久寿命影响显著;晶内强度与晶界强度的合理匹配也是获得高持久寿命的重要因素。
The effects of heat treatment on tensile properties at 760℃ and stress rupture at 900℃ in Nibased superalloy GH141 were investigated The relationship between microstructures and mechanical behaviors at elevated temperature was discussed The results show that the relationship between grain size and tensile strength still follows HallPetch law,and the strengthening γ′phases can be described by the model in which dislocation overcome γ′ phases from cutting to bypassing The type and amounts of grainboundary carbides have a very deep influence on rupture life The strength balance between grainboundaries and inside grains is also very important for the life of alloy
出处
《材料工程》
EI
CAS
CSCD
北大核心
2003年第9期3-6,共4页
Journal of Materials Engineering
关键词
高温合金
热处理
高温拉伸
高温持久性能
superalloys
heat treatment
high temperature tensile
stress rupture
