Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1630345 | Journal of University of Science and Technology Beijing, Mineral, Metallurgy, Material | 2008 | 6 Pages |
Abstract
The effect of cooling rate on the cooling γⲠprecipitation behaviors was investigated in a Ni-base powder/metallurgy (P/M) superalloy (FGH4096). The empirical equations were established between the cooling rate and the average sizes of secondary and tertiary γⲠprecipitates within grains and tertiary γⲠprecipitates at grain boundaries, as well as the apparent width of grain boundaries. The results show that the average sizes of secondary or tertiary γⲠprecipitates are inversely correlated with the cooling rate. The shape of secondary γⲠprecipitates within grains changes from butterfly-like to spherical with the increase of cooling rate, but all the tertiary γⲠprecipitates formed are spherical in shape. It is also found that tertiary γⲠmay be precipitated in the latter part of the cooling cycle only if the cooling rate is not faster than 4.3°C/s, and the apparent width of grain boundaries decreases linearly with the increase of cooling rate.
Related Topics
Physical Sciences and Engineering
Materials Science
Metals and Alloys
Authors
Gaofeng Tian, Chengchang Jia, Ying Wen, Benfu Hu,