Effects of secondary precipitation on recrystallization in Co-base superalloy DZ40M
(1.Key Laboratory for Anisotropy and Texture of Materials, Ministry of Education,Northeastern University, Shenyang 110004, China
2.辽宁省沈阳市东北大学材料各向异性与织构工程教育部重点实验室)
2.辽宁省沈阳市东北大学材料各向异性与织构工程教育部重点实验室)
Abstract: A series of experimental studies were conducted on the recrystallization of directionally solidified cobalt-base superalloy DZ40M. It is found that the secondary M23C6 precipitation influences the size and shape of the recrystal grains. When the annealing temperature is below 1 473 K, a large amount of the fine secondary M23C6 precipitations are distributed around the primary carbides, and such carbides impede the movement of grain boundary because the effect, the size and shape of recrystal grains become irregularly. When the temperature exceeds 1 473 K, the recrystal grains grow rapidly due to the dissolved secondary M23C6 precipitation.
Key words: DZ40M alloy; Co-base superalloy; secondary precipitation; recrystallization; pinning force