Kinetic and Metallography Study of the Oxidation at 1250 °C of {Co plus Ni}-Based Superalloys Containing Ti to Form MC Carbides
Kinetic and Metallography Study of the Oxidation at 1250 °C of {Co plus Ni}-Based Superalloys Containing Ti to Form MC Carbides
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DOI：
10.3390/met12010010
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发表时间：
2022-01-01
期刊：
影响因子：
2.9
通讯作者：
Etienne, Erwan
中科院分区：
文献类型：
--
作者：
Berthod, Patrice;Ozouaki Wora, Synthia Annick;Etienne, Erwan
Six conventionally cast chromium-rich titanium-containing alloys based on cobalt and nickel with various Co/Ni ratios were considered. They were tested in oxidation in air at 1250 degrees C for 70 h in a thermo-balance. The mass gain curves were exploited to specify different types of kinetic constants as well as several parameters characterizing the oxide spallation occurring during cooling. The obtained results show that, the higher the Ni content, the slower the mass gain and the better the quality of the protective external chromia scale. Secondly, no dependence of the oxide spallation characteristics on the Co content was clearly noted. Globally, the isothermal oxidation behavior becomes better when Ni is more and more present at the expense of Co. Titanium seems to be playing a particular role in the process of oxidation. It notably leads to the presence of an external thin TiO2 continuous scale beyond the chromia scale. The thermogravimetry records were numerically treated to determine the parabolic constant and the chromia volatilization constant. The values of these constants evidenced a double tendency: chromia growth acceleration and chromia volatilization slow-down. These trends are to be confirmed and further investigated.
