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中文摘要：
采用镍基单晶合金DD6带不同数量激光加工气膜孔的薄壁平板模拟试样,对其在900℃下的低周疲劳性能进行了研究,并对试验数据和断口的SEM形貌进行了分析。结果表明：在相同的试验条件下,气膜孔的数量对低周疲劳的寿命影响很大,单孔试样的寿命约为密排多孔试样的10倍;气膜孔周围存在大量微裂纹,带气膜孔试样的破坏属于典型的多源断裂;对于单孔试样及密排多孔试样的中间孔,裂纹沿{001}面扩展;密排多孔试样的上下2排气膜孔周围的裂纹沿多个滑移面扩展。
英文摘要：
The flat plate specimens of nickel-base single crystal superalloy DD6 with different numbers of laser-processed cooling film holes were used to study the low cycle fatigue properties at 900 ℃. The test data and SEM fracture images were analyzed. The results show that the life of single-hole specimens is ten times of that of the close-spaced holes specimens in the same experimental condition. A number of microcracks are found around the cooling film hole and the destruction of the specimens with cooling film holes is a typical multi-source rupture.The cracks propagate along the {001} planes for single-hole specimens and the middle holes of the close-spaced holes specimens, but the cracks extend along a plurality of slip plane for up and bottom holes of the specimens with close-spaced holes.
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Effects of roundness of laser-formed Film cooling holes on fatigue life of nickel-Based single cryst
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Tension/compression asymmetry of [001] single crystal nickel-based superalloy DD6 during low cycle f
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