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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。
The thin-walled flat-plate samples with nickel-based single crystal DD6 with different numbers of holes were machined to study the low cycle fatigue behavior at 900 ℃. The experimental data and the SEM morphology of the fracture surface analysis. The results show that under the same experimental conditions, the number of film pores has a great influence on the fatigue life of low-cycle fatigue, the lifetime of the single-hole sample is about 10 times that of the dense-row porous sample, and there are a large number of microcracks , The failure of the sample with the film hole belongs to the typical multi-source fracture. For the single hole sample and the dense hole porous sample, the crack propagates along the {001} plane; the two rows of air film Cracks around the hole extend along multiple slip planes.