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A new Ni based superalloy is considered as bucket material because of high fatigue resistance with fine grain. However a bucket is usually exposed to high temperature for a long time, so creep rupture tests were conducted to understand the microstructure evolution during creep deformation under various stresses at temperatures of 566, 593, 621, 649 and 670 ℃. The hardness applied to the crept specimen of these alloys increased until the value of LMP reached 25, and decreased while the value ofdoi:10.3365/kjmm.2017.55.7.486 fatcat:7om65vu3qbglrhn5q7h6zgaphe