Effect of precipitation aging temperatures on rejuvenation heat treated microstructures, hardness and Î³' phase stability in Udimet-500
AbstractThis research has studied the effect of precipitation aging temperatures on size and area density of Î³' particles of the reheat treated microstructures incast nickel basesuperalloy, grade Udimet-500. All specimens were performed the same solutioning treatment at temperature of 1,150ÂºC for 4 hours following with various precipitation aging temperatures of 760, 780, 800 and 820ÂºC for 16 hours. Furthermore, these reheat treated specimens were also performed long-term heating at temperatures of 900ÂºC and 1000ÂºC for 200 hours to evaluate Î³'-phase stability. Finally, hardness measurements were also carried out. Form all obtained results, it was found that the standard precipitation aging temperature of 760ÂºC for 16 hours provided the most phase stability after long-term tests as well as the maximum hardness.
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