摘要
Microstructural stability of IN939 superalloy with two different manufacturing routes was investigated during long-term aging at elevated temperatures by light optical microscope（OM） and scanning electron microscope（SEM） equipped with an EDS system.The results show mat the coarsening behavior of γ＇ particles is primarily impacted by the initial heat treatment conditions,and the effect of the prior manufacturing route（casting or hot forming） is found to be insignificant,if any,on the γ＇ particles coarsening kinetics.In the temperature range of 790-827 ℃,IN939 cast/wrought-HT2 alloys have more microstructural stability,while in the temperature range of 827-910 ℃,the initial heat treatment marked as HT1 provides more stable microstructure for the cast or wrought IN939 superalloy.
采用光学显微镜、扫描电子显微镜及能谱分析对两种不同方法制备的IN939高温合金在高温、长时间时效过程中的组织稳定性进行研究。结果表明,γ′粒子的粗化行为主要受到初始热处理条件的影响,而之前的制备方法（铸造或热变形）的影响不明显,若有,也只是对γ′粒子的粗化动力学有影响。在790-827℃的温度范围内,铸态或锻态IN939合金样品都有比较好的组织稳定性。在827-910℃的温度范围内,采用初始热处理条件HT1的样品不管是在铸态还是在锻态都有比较好的组织稳定性。
