摘要
采用含与不含气膜孔平板试样,研究了[001]、[011]和[111]晶体取向在980℃不同保载时间和应力条件下的镍基单晶合金DD6的循环蠕变性能。研究发现,DD6单晶合金的高温蠕变疲劳性能存在明显的方向性,试样形状及表面状态是影响单晶合金寿命的重要因素,特别是气膜孔的存在显著地降低了材料的循环蠕变寿命;不含气膜孔平板试样蠕变损伤起主要作用,含气膜孔平板试样疲劳损伤起主要作用。同时,在高温条件下,不同保载时间的蠕变和疲劳损伤对试件的破坏起重要作用,蠕变与疲劳的交互作用会大大缩短材料的使用寿命。
The fatigue-creep properties of DD6 single crystal supperalloy with [001], [011], [111] crystallographic orientations have been investigated under different dwell time and stress level at 980℃. One half of specimens are plates with film cooling holes. The experimental results show the fatigue-creep property of DD6 is obviously anisotropic. The film cooling hole will reduce the fatigue-creep life of material. The creep damage is the major damage on the plate specimen without film cooling holes; however the fatigue damage becomes the major damage when the plate specimen with film cooling holes. Under high temperature, the fatigue and creep damages at different dwell time play a main role in fracture of test specimens. Interaction between fatigue and creep will greatly shorten the using life of material.
出处
《燃气涡轮试验与研究》
2007年第3期51-56,共6页
Gas Turbine Experiment and Research
关键词
DD6
单晶合金
循环蠕变
气膜孔
DD6
single crystal
fatigue-creep
film cooling hole
