Method for producing a part made of a y/y' nickel-based alloy by hot forging

Abstract

The invention relates to a method for producing a part made of a nickel-based alloy with a Y/Y′ microstructure in which at least one hot-forging step is performed, which method is characterised in that the temperature at which the part is heated in the forging step is maintained within a temperature range lower than the abnormal grain growth temperature range of the alloy, the hot-forging temperature being maintained at a temperature lower than the temperature of the part, the hot-forging temperature being such that the difference compared with the temperature at which the part is heated is less than 250° C. and preferably less than 150° C.

1 . A method for producing a part made of a nickel-based alloy with a γ/γ′ microstructure; the method comprising:
 a hot-forging step of hot-forging the part; 
 wherein a temperature at which the part is heated in the hot-forging step is maintained within a temperature range lower than an abnormal grain growth temperature range of the nickel-based alloy; and 
 wherein a hot-forging temperature is maintained at a temperature lower than the temperature at which the part is heated in the hot-forging step, and the hot-forging temperature being such that a difference between the hot-forging temperature and the temperature at which the part is heated in the hot-forging step is less than 325° C. 
 
     
     
         2 . The method according to  claim 1 , wherein the hot-forging temperature is such that the difference between the hot-forging temperature and the temperature at which the part is heated in the hot-forging step is less than 150° C. 
     
     
         3 . The method according to  claim 1 , wherein the nickel-based alloy is of Rene65, AD730® or Udimet720™. 
     
     
         4 . The method according to  claim 3 , wherein a blank forging or finishing step is performed at a temperature at which the part is heated equal to or lower than the solvus temperature γ′ of the nickel-based alloy minus 80° C. (+/−10° C.), the hot-forging temperature being higher than 700° C. (+/−10° C.) and less than 900° C. (+/−10° C.). 
     
     
         5 . The method according to  claim 4 , wherein the temperature at which the part is heated in the blank forging or finishing step is 1025° C. (+/−10° C.) or lower. 
     
     
         6 . The method according to  claim 5 , wherein the temperature at which the part is heated in the blank forging or finishing step is 1000° C. (+/−10° C.) or higher. 
     
     
         7 . The method according to  claim 4 , wherein the hot-forging temperature is higher than 800° C. 
     
     
         8 . The method according to  claim 4 , wherein the hot-forging temperature is 850° C. or higher. 
     
     
         9 . An aircraft high-pressure turbine disc, low-pressure turbine disc, or high-pressure compressor disc produced using the method according to  claim 1 . 
     
     
         10 . An aircraft turbine engine comprising high-pressure turbine disc, low-pressure turbine disc, or high-pressure compressor disc according to  claim 9 .