Metallurgical Analysis of different processing technologies on tensile behavior of GH4169 superalloy

By the measurement of tensile property and microstructure observation, the different effect of 1MJ counter-blow hammer forging and 800MN die forging on the disc were investigated. In order to obtain final forging temperature, hot compression tests under 920~1030°C at 0.08 true strain were performed on GH4169 superalloy. The results showed that at the same processing parameter, ASTM 10 grain and granular δ were obtained by count-blow hammer forging, UTS is 1563Mpa; ASTM 8 grain and needle-like δ phase segregation were obtained by die forging, UTS is 1408Mpa. According to evolution of microstructure under isothermal compression, in one case that final forging temperature of count-blow hammer is about 1000°C, while it is 930°C under die forging. The microstructure of the forging is strongly related to the fabrication process, increase the preheating temperature of the die as much as possible, increase the pressing rate, excellent mechanical property can be obtained by die forging.