Heat treatment method for improving gap sensitivity of GH4169 high-temperature alloy

The invention discloses a heat treatment method for improving notch sensitivity of a GH4169 high-temperature alloy, which mainly solves the problem that the GH4169 is subjected to standard heat treatment and solution treatment: (950-980 DEG C) +/-10 DEG C, heat preservation is performed for 1h, and air cooling is performed; aging treatment: carrying out heat preservation for 8 hours at 720 +/-10 DEG C, carrying out furnace cooling to 620 +/-10 DEG C at the speed of (50 +/-10) DEG C/h, carrying out heat preservation for 8 hours, and carrying out air cooling treatment when the high-temperature notch durability of the material cannot meet the service conditions of technical standard requirements, adding a step of heat treatment at 880 +/-10 DEG C and carrying out heat preservation for 2-3 hours before standard heat treatment, so as to increase the delta-phase precipitation number and improve the high-temperature notch durability of the material. The method has the advantages that a section of pretreatment includ