Nimonic 80A の機械的性質におよぼす Ti, Al 等の影響 : Ni 基耐熱合金に関する研究 VI

概要

論文の詳細を見る
Effects of Ti, Al and gas content on stress-rupture characteristics at 750℃ and 26.8kg/mm^2 were investigated. Stress-rupture life increased with an increase of Ti+Al atm% containing below 2.9% Tiand 1.44% Al. Elongation after stress-rupture was small and the effect of Ti and Al content on it was not clear. Stress-rupture life depends not only on the amount of Ti and Al but also on the amount of nitrogen and oxygen or hydrogen, which arises from the melting procedure and content of raw materials. As in the case of an increase of the amount of gas content causes the decrease of stress-rupture life remarkably, so the material vacuum-melted or the material which is air-melted after vacuum-melting have more stress-rupture life than the material air-melted from fresh raw material. As the fact that the increase of gas content causes much precipitate around grain boundary, and tends to soften the material during stress-rupture testing by overaging, so stress-rupture life decreases. Effect of microstructure on stress-rupture life is presumably the same phenomena as heat treatments such as A and B to the effect of gas content.
社団法人日本鉄鋼協会の論文
1959-04-01