日本金属学会誌
Online ISSN : 1880-6880
Print ISSN : 0021-4876
ISSN-L : 0021-4876
Ni 基単結晶超合金のクリープ寿命に及ぼすアルミ拡散コーティングの影響
佐藤 彰洋青木 祥宏荒井 幹也原田 広史
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2007 年 71 巻 3 号 p. 320-325

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  This article compares the creep rupture responses of aluminide coated samples with uncoated ones to elucidate the effect of diffusion layers on resistance against creep. Three Ni-base single crystal superalloys, CMSX-4, TMS-75 and TMS-138, were chosen for present study. Creep specimens had thicknesses ranged from 1 mm to 4 mm to simulate the varying dimensions across the actual turbine blade. Creep conditions were set at 1060°C-137 MPa and 1100°C-137 MPa. Experimental results indicated that the creep-rupture lives of coated specimens were shorter than those of the bare samples. In particular, the coated TMS-138 specimen with 1 mm thickness had an 86% reduction in creep rupture life. Microstructural observations on coated samples indicated the formation of diffusion zones beneath the coating; a creep life model was then developed to taken account the reduction in load bearing cross sectional area. In conclusions, the creep-rupture lives predicted by the model have shown good agreement with the experimental values.

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© 2007 (公社)日本金属学会
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