Ar-H_2O 雰囲気における Fe-38Ni-13Co-4.7Nb-1.5Ti-0.4Si 耐熱合金の高温酸化

概要

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The oxidation of an Fe-38Ni-13Co-4.7Nb-1.5Ti-0.4Si alloy, (Incoloy 909 type alloy (alloy 909), has been investigated in the temperature range of 1000K to 1400K in Ar-(1, 10%)H_2O atmosphere using metallographic, electron probe microanalysis and X-ray diffraction techniques. The oxide scales consisted of an external scale and an internal scale which had an intergranular scale (<1200K) and an intragranular scale. The oxide phases in each scale were identified as α-Fe_2O_3(<1200K) or FeO(>1300K) and CoO・Fe_2O_3 and FeO・Nb_2O_5, respectively. The morphologies, the oxide phases and the oxidation rates did not depend on the partial pressure of H_2O in the range between 1 and 10 percent in Ar gas. The rate constants for the intergranular scale formation in alloy 909 were about one-tenth as large as those in Fe-36%Ni alloy reported previously. At all the temperatures the scales grew according to a parabolic rate law and the apparent activation energies for the processes were estimated.
社団法人日本鉄鋼協会の論文
1994-07-01