Abstract：The effects of different solution treatments on microstructure and properties of spray formed superalloy GH742y after forged were studied.The results showed that spray formed superalloy GH742y exhibited homogenous composition,segregation-free and fine microstructure.The grain size was about 35μm and hasn't changed with increasing temperature.The solvus temperature of γ′phase was about 1130℃.The shape and size of γ′phase were different,but mechanical properties of GH742y did not change after different heat treatments.The yield strength and stress rupture time of the alloy reached 1150MPa and 200h respectively in different heat treatments.
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