Bulging heat treatment method for high-temperature alloy flash welding ring parts

Abstract

The invention discloses a bulging heat treatment method for high-temperature alloy flash welding ring parts. The bulging heat treatment method comprises the following steps of: before bulging, loading the welded and formed alloy flash welding ring parts into an electric furnace at the temperature of smaller than or equal to 925 DEG C, heating the alloy flash welding ring parts to 925 DEG C + / - 5 DEG C along with the furnace, carrying out heat preservation, determining the heat preservation time according to the wall thicknesses of the ring parts, for the ring parts with the wall thicknesses of smaller than 100 mm, selecting the time of 30 minutes to 2 hours as the heat preservation time according to the wall thicknesses, and carrying out air cooling after heat preservation is completed to complete solution treatment; and loading the alloy flash welding ring parts subjected to solution treatment into the electric furnace at the temperature of smaller than or equal to 715 DEG C, heating the alloy flash welding ring parts to 715 DEG C + / - 5 DEG C along with the furnace, carrying out heat preservation for not smaller than 8 hours, cooling the alloy flash welding ring parts to 620 DEG C + / - 5 DEG C at the speed of 55 DEG C + / - 5 DEG C per hour, carrying out heat preservation for not smaller than 8 hours, and then cooling in air to finish double-aging treatment. The method is mainly applied to heat treatment before bulging of the high-temperature alloy flash welding ring parts.

Description

technical field [0001] The invention relates to a heat treatment method, in particular to a bulging heat treatment method for a superalloy flash welding ring. Background technique [0002] The Chinese Invention Patent Specification CN102500704A published on June 20, 2012 discloses a method for thermal expansion of a superalloy flash welding ring. The surrounding area of ​​the preheated bulging block in the forming machine is started, so that the bulging block squeezes the ring from the inner peripheral surface of the ring radially to complete the first bulging. The bulging temperature is 800 ° C ~ 950 ° C The forming time is 22-28s, the holding time is 10-12s, and the deformation amount is 0.6%-0.8%; then the ring is rotated 45° along the central axis to complete the first rotation; The temperature is 770℃~920℃, the bulging time is 25~30s, the holding time is 20~22s, and the deformation is 0.7%~0.9%. Rotate the ring once again according to the first rotation direction to co...

AI Technical Summary

Problems solved by technology

[0003] This method uses annealing for heat treatment before bulging of superalloy flash welding rings and then bulges. Since annealing can only remove part of the stress after welding of superalloy flash welding rings, it cannot change the structure of the rings, resulting in bulging. The microstructure and performance of the ring after forming can not be improved; and because there are coarse grains in the heat-affected zone of welding, the deformation coordination among the coarse grains is poor during the bulging deformation process, resulting in stress concentration on the grain boundary and easy formation of Holes and cracks are formed after bulging and stretching, which affects the quality of bulging rings