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鎳基單晶氣膜孔模擬試樣的低周疲勞斷裂機理
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國家自然科學(xué)基金（51210008，51175424）；西北工業(yè)大學(xué)研究生創(chuàng)業(yè)種子基金（Z2013059）


Low Cycle Fatigue Fracture Mechanism of a Modeling Specimen with Cooling Film Hole of DD6 Single Crystal Superalloy
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    摘要:

    采用鎳基單晶合金DD6帶不同數(shù)量激光加工氣膜孔的薄壁平板模擬試樣，對其在900 ℃下的低周疲勞性能進行了研究，并對試驗數(shù)據(jù)和斷口的SEM形貌進行了分析。結(jié)果表明：在相同的試驗條件下，氣膜孔的數(shù)量對低周疲勞的壽命影響很大，單孔試樣的壽命約為密排多孔試樣的10倍；氣膜孔周圍存在大量微裂紋，帶氣膜孔試樣的破壞屬于典型的多源斷裂；對于單孔試樣及密排多孔試樣的中間孔，裂紋沿{001}面擴展；密排多孔試樣的上下2排氣膜孔周圍的裂紋沿多個滑移面擴展。

    Abstract:

    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 oC. 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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盧緒平,溫志勛,岳珠峰,張曉兵.鎳基單晶氣膜孔模擬試樣的低周疲勞斷裂機理[J].稀有金屬材料與工程,2015,44(5):1173~1176.[Lu Xuping, Wen Zhixun, Yue Zhufeng, Zhang Xiaobing. Low Cycle Fatigue Fracture Mechanism of a Modeling Specimen with Cooling Film Hole of DD6 Single Crystal Superalloy[J]. Rare Metal Materials and Engineering,2015,44(5):1173~1176.]
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  • 收稿日期:2014-05-20
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  • 在線發(fā)布日期: 2015-06-08
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