摘要
研究了第二代单晶高温合金DD6在980℃无应变时效2000 h处理后的显微组织。结果表明:时效时间在1000 h以内时,γ'相呈立方形态分布,平均尺寸长大到1.0μm左右。在时效时间从1000 h增加到2000 h过程中,枝晶干与枝晶间的显微组织变化出现差异,枝晶干处γ'相明显粗化,但仍基本保持立方状;枝晶间γ'相连接、合并,时效2000 h时基本形成筏状组织。DD6合金980℃时效后组织基本稳定,2000 h时效后仅发现少量TCP相析出。
The microstructures of the second generation single crystal superalloy DD6 were investigated after aging at 980 ℃ for 2000 h without sWain. The results show that when the aging time is less than 1000 h, the γ＇ phase presents a cubic form distribution, and the average size is about 1.0 μm. During the aging time increasing from 1000 h to 2000 h, the difference of microstructure change between dendrite stem and interdendritic appears, the γ＇ phase at dendrite stem obviouly coarsens, but still basically maintains cube; the γ＇ phase in interdendritic connects and amalgamates, and the raft microstructure is formed at the aging for 2000 h. The microstructure of DD6 alloy is basically stable after aging at 980℃, and a small amount of TCP （topological closed packed） phase precipitates after aging for 2000 h.
出处
《热加工工艺》
CSCD
北大核心
2017年第14期197-199,共3页
Hot Working Technology
基金
航空科学基金项目(2014ZE21009)
