High temperature oxidation properties of GX40CrNiSi25-12 austenitic heat resistant cast steel

doi:10.13251/j.issn.0254-6051.2022.11.037

Abstract

Abstract: High temperature oxidation resistance of the GX40CrNiSi25-12 austenitic heat resistant cast steel at different oxidation temperatures and time was studied by means of constant temperature oxidation test. The oxidation kinetics, morphologies and composition of oxide films were analyzed by means of oxidation mass gain method, optical microscope, scanning electron microscope and energy dispersive spectrum analysis, respectively. The results show that the oxidation kinetics curves at temperatures of 850 ℃, 950 ℃ and 1050 ℃ all follow parabolic law, and the average oxidation rates oxidized for 100 h at different temperatures are in the range of Grade one standard representing complete anti-oxidation level according to GB/T 13303—1991. At 850 ℃ and 950 ℃, the oxide films are flat and dense, which are composed of small, uniform and densely arranged irregular polygonal oxides. Significant oxide grain size inhomogeneity appears in the oxide film at 1050 ℃. The good high temperature oxidation resistance of the GX40CrNiSi25-12 austenitic heat resistant cast steel is related to the high content of Cr in the oxide film.

Key words: austenitic heat resistant cast steel, high temperature oxidation, oxidation kinetics, microstructure

CLC Number:

TG142.7

Li Jie, Hu Jianwen, Lu Zitong. High temperature oxidation properties of GX40CrNiSi25-12 austenitic heat resistant cast steel[J]. Heat Treatment of Metals, 2022, 47(11): 211-215.

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