摘要
研究了定向凝固高温合金IC10在760℃/750MPa条件下的恒载拉伸蠕变机理。结果表明:在760℃/750MPa条件下蠕变时,IC10合金组织稳定,TEM位错形貌中有反向畴和层错,位错切过γ′是合金的主要蠕变机制。蠕变裂纹均产生于γ基体和碳化物界面上,并沿着垂直于应力轴方向在基体中扩展。
The creep behavior of directionally solidified superalloy IC10 was investigated at 760℃/ 750MPa and the deformation mechanism was studied. The results showed that anti-phase boundary （APB） and stacking fault（SF） were observed by using TEM, which indicated that the dislocations cutting through γ＇ precipitates was the main creep deformation mechanism at 760℃. The morphology of cracks were observed by SEM, the cracks initiated from the interface between γ matrix and carbides, and extended along the direction normal to the applied stress.
出处
《材料工程》
EI
CAS
CSCD
北大核心
2009年第1期1-3,9,共4页
Journal of Materials Engineering
关键词
定向凝固
蠕变
反向畴
层错
裂纹
directionally solidification
creep
anti-phase boundary
stacking fault
crack
