内部摩擦法によるマルエージ鋼の時効過程の研究

概要

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The maraging reactions of Fe-Ni-Cr ternary and Fe-Ni-Cr-Co quaternary alloys with and without 1% Nb addition are studied by measuring internal friction and relative shear modulus during isothermal anneal in the temperature range between 300℃ and 600℃ for 5 to 10000 min. The results are summarized as follows. 1) Several stages of internal friction and relative shear modulus changes are found and related to the following processes. I_1 ; carbide precipitation, I_2 ; short range ordering, I_3, G_1, and I_4 ; precipitation and resolution of Nb containing metastable phase, G_2 ; clustering of Cr atoms, I_5 and G_3 ; austenite formation, I_6 and G_4 ; recrystallization of formed austenite. The simple TTT diagrams which give the beginning and end of the aging reactions are proposed. 2) Nb addition prevents the short range ordering in base alloys. 3) Nb containing metastable phase precipitates at temperatures lower than 450℃ and this phase resolves between 400℃ and 500℃. 4) The clustering of Cr atoms occurs in all samples, even in the alloy containing only 3.5%Cr.
社団法人日本鉄鋼協会の論文
1975-08-01