摘要
研究了GH738合金在固溶+稳定化+时效处理的多阶段热处理过程中组织演化规律和相应的室温硬度变化,构建了该合金组织演化的定性模型。结果表明,固溶温度高于γ'相回溶温度时,合金最终组织为连续晶界碳化物和尺寸均匀的γ'相;当固溶温度低于γ'相回溶温度时,在低稳定化温度下晶界碳化物成断续、颗粒状晶内存在大、小两种尺寸的γ'相。稳定化处理制度为850℃×100 min时,合金可以获得最大的室温硬度。
Microstructure evolution and corresponding room temperature hardness of GH738 alloy were investigated under multistage heat treatment process,which contained solution,stabilization and aging.Qualitative model were then constructed.The results show that continuous carbides at grain boundaries and γ’ with similar size are observed when the solution temperature is higher than that of γ’ solvus.On the other hand,discontinuous carbides appear at grain boundaries when the solution temperature is lower than that of γ’ solvus at low stabilization temperature.Furthermore,two kinds of γ’ phase with different sizes are obtained in grains.GH738 alloy can obtain the maximum hardness at room temperature after stabilization treatment of 850 ℃×100 min.
出处
《金属热处理》
CAS
CSCD
北大核心
2015年第12期97-102,共6页
Heat Treatment of Metals
基金
国家自然科学基金青年科学基金(51301085)
南京工程学院引进人才科研启动基金(YKJ201305)
