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Vol.35, No.4, 399 ~ 405, 1997
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| Title |
| Study of Precipitation and Growth of Υ' Phase in Mar-M247 Ni-base Superalloy |
| 김근수 , 이동환 , 구본흔 , 이찬규 , 이종훈 , 최승주 Keun Soo Kim , Dong Hwan Lee , Bon Beun Koo , Chan Gyu Lee , Jong Hoon Lee , Seung Joo Choi |
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| Abstract |
| The precipitation and growth behaviors of γ′ phase in Mar-M247 type Ni-base Superalloy have been investigated mainly by micro-Vickers hardness test, scanning electron microscopy, transmission electron microscopy and electrical resistivity measurements. The γ′ precipitates were observed to be spherical at the early stage of aging time at all aging temperature and to be cuboidal at the later stage at 920, 970℃. The hardness of specimens aged in various conditions closely related to the size of γ′ precipitates. The growth kinetics of γ′ precipitates followed the prediction of Lifshitz-Slyozov-Wagner(L-S-W) theory of diffusion controlled growth at all aging temperatures(820, 870, 920, 970℃). The activation energy for the growth of γ′ precipitates was estimated 233kJ/㏖ which was nearly similar to those of diffusion for solute atoms(Co,Cr,Ti) in Ni₃Al and Ni-base Superalloys. |
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