Effect of stress relief annealing on recrystallization behavior of DZ125 alloy
LIU Li-rong
PU Yi-fan
PENG Zhi-jiang
ZHANG Ming-jun
TIAN Su-gui
Abstract：In order to obtain the directional solidification superalloy with excellent mechanical properties at high temperature and reduce the recrystallization phenomenon of directional solidification blade in the production process,the stress relief annealing treatment was conducted for the DZ125 alloy after shot blasting,and then the heat treatments at different temperatures were performed for the DZ125 alloy.In addition,the microstructures of DZ125 alloy were observed with scanning electron microscope (SEM).The results show that when the Almen value which characterizes the shot blasting strength is 0.25 mm,a small amount of cellular recrystallization still exists in the DZ125 alloy after the stress relief annealing at 870 ℃ for 500 h and the heat treatment at 1 000 ℃ for 4 h are successively performed.After the heat treatment at 1 150 ℃ for 4 h,the depth of cellular recrystallized layer decreases by about 30%.After the heat treatment at 1 230 ℃ for 4 h,the depth of equiaxed recrystallized layer decreases by about 30%.When the Almen value is 0.17 mm and after the stress relief annealing at 870 ℃ for different time and the heat treatment at 1 230 ℃ for 4 h are successively performed,it is found that with increasing the annealing time,the depth of recrystallized layer gradually decreases.When the annealing time is 500 h,the depth of recrystallized layer decreases by about 50%.
Keywords：directional solidficationmechanical propertyrecrystallizationstress relief annealingheat treatmentmicrostructureshot blasting strengthDZ125 alloy
Publication Date：2016-08-31
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 486-490 )