| Creep behaviors of solution treated, solution and precipitation heat treated, and solution, precipitation and carburization treated Nimonic 86 alloys were compared. Solution treatments were carried out at 1150℃ for 2 hours and precipitation treatments were performed at 900℃ for 200 and 1000 hours. Carburization treatments were performed during precipitation treatment using carburizing atmosphere. Creep tests were carried out up to 1200 hours at 850 and 950℃. Precipitation heat treatment decreased the creep resistance compared to the solution treatment. and the carburization treatment significantly increased the creep resistance, especially at 950℃. The results were explained by the relative amounts, size, and distribution of carbide precipftates. |
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