| Title |
The Effect of Surface - Recrystallization on Creep Properties in a Directionally Solidified Nickel -- Base Superalloy |
| Authors |
이도인(Do In Lee) ; 허보녕(Bo Young Hur) ; 이종훈(Jong Hoon Lee) ; 김학민(Hag Min Kim) |
| Abstract |
Recrystaltization at the surface of specimen was observed during heat treatment due to lathe machining or shot peening. In order to investigate the effect of surface recrystallization on creep properties, creep test was conducted at 1050℃ under a stress of 123MPa. Creep rupture lives were compared among DS specimen without surface recrystallized layer, specimens with surface recrystallized layer of 80∼100㎛ and 160-180㎛. Creep rupture time of DS specimen without surface recrystallized layer was longer than DS specimen with surface recrystallized layer (160-180㎛), which was reduced more than the specimen with surface recrystallized layer(80-100㎛). Microcracks were formed around γ´ denuded zone. |