OS1808 コールドスプレーで施工したNi基超合金の微視組織および強度に及ぼす熱処理の効果(OS18-2 薄膜・コーティング材の力学特性と微構造2,OS-18 薄膜・コーティング材の力学特性と微構造)

概要

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In our previous study, it was successful to make thick Ni base superalloy coatings by cold spray (CS) technique. However, the mechanical property and microstructure of an as-sprayed CS coating have been unsatisfactory compared with a bulk material. Therefore, in order to improve the material prpperties, heat treatments were conducted to the CS coatings. As for an as-sprayed IN738LC coating, heat treatment (1121℃/2h + 843℃/24h) was applied. Prior to heat treatment, the as-sprayed coating had nano-order crystalline in the vicinity of the interface between coating and substrate. However, after heat treatment, the nano-order grains changed for micron-order grains. This grain growth can induce the enhancement of the material properties such as ductibility and adhesion strength etc., and release of residual stress. In order to improve mechanical properties of the CS coatings, high temperature solution heat treatment, namely 1171 ℃/2h, was applied to as-sprayed CS coatings. As a result, the coating strength by small punch tests and adhesion strength by 4-point bending were prominently improved.
2011-07-16