301 Ni基超合金コールドスプレー皮膜に対する熱処理の効果(OS3-1 薄膜・コーティング材の機械的特性と界面強度特性)

概要

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Cold spraying for polycrystalline Ni-base superalloy INCONEL738LC(IN738LC) is carried out to apply as a repair technique for gas turbine blades, So far, thick coating of the IN738LC was produced on the same material by the cold spray. However, the cold sprayed IN738LC coating after deposition had insufficient mechanical property compared with the bulk IN738LC. Heatment (HT) for as-sprayed coatings was known to improve its strength. In this study, as-sprayed coatings were subjected to some HT conditions, and observed its microstructure to choose the optimal condition. In the case of as-sprayed coatings, γ-precipitation phases were not observed by SEM. On the other hand, heat-treated coatings had distrinct precipitation of γ-phases. Then solid-state diffusion from the coating to the substrate was supposed from SEM and EBSD analyses results. This diffusion can be caused by residual stress, which was generated by high velocity impingements to a substate during spraying and solution heat treatment (1121℃/2h). In addition, solution heat treatment has an effect to recrystallize the microstructure of the sprayed alloy.
一般社団法人日本機械学会の論文
2010-10-09