原子力製鉄用耐熱合金のヘリウム及び還元ガス雰囲気中クリープ破断特性とその劣化

概要

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Creep rupture properties of heat resistant alloys with carbide or carbide and γ′ precipitates were investigated in the temperature range from 900° to 1050℃ in He and reducing gas atmospheres. The degradation of the rupture strengths took place in the alloys, which have carbide as a strengthener, due to decarburization in He atmoshere at higher temperature than 1000℃. In the alloy which was strengthened mainly by γ′, the solutioning of γ′ led to the degradation of the rupture strengths, but to the restoration of rupture ductilities in greater extent. A new method to predict the rupture life, steady state creep rate, etc. from 0.2% proof stress was proposed. In most cases, the method was found to be satisfactory in the sense that it represents the degradation behaviour of the alloys according to various causes.
社団法人日本鉄鋼協会の論文
1983-12-01