S1903-1-2 一液式スラスタ用L-605合金の環境劣化(宇宙構造・材料)

概要

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L-605 (Haynes 25) alloy has been used for the mono-propellant structure and screen materials because of its excellent combination of high strength, up to 1100 K, and high oxidation resistance, up to 1400 K. However, deterioration of L-605 alloy caused by the effect of a high temperature environment with nitrogen and ammonia has been reported. Therefore, the alloy composition, hardness and microstructure of L-605 alloy were evaluated with and without heat treatment in a nitrogen gas atmosphere in order to investigate the degradation mechanism of the alloy. The hardness of the surface layer of the alloy increases with increasing heat treatment temperature. Concentration of chromium at the surface layer of the alloy was observed after being heat treated at 1173 K. In addition, chromium nitrides were detected in the alloy after heat treatment. These results indicate that the chromium nitride formation is a causal factor of deterioration of L-605 alloy.
一般社団法人日本機械学会の論文
2009-09-12