|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Gas Turbines
||The Influence of Dendritic Segregation Degree to the Recrystallization Nucleation in U4720LI
||Jiayu Chen, Jianxin Dong
|On-Site Speaker (Planned)
The effect of dendritic segregation degree on volume fractions and nucleation sites of recrystallization was investigated through comparing three kinds of samples with heavy degree of dendritic segregation, with light degree of dendritic segregation and without dendritic segregation. The degree of dendritic segregation was controlled by altering homogenization time. Stress concentration was caused by uneven distributions of γ’ phases in dendrite arm and interdendritic areas. Meanwhile, recrystallization was retarded due to the pinning effect of γ’ phases in interdendritic areas. Thus, recrystallization nucleation started along the grain boundary, then in the junction of dendrite arm and interdendritic areas but at the side of dendrite arm areas with the increase of deformation degree. Finally, nucleation occurred in the interdendritic area. Moreover, strain concentration was released as γ’ phases were more evenly distributed with the increase of homogenization time which lead recrystallization volume fractions reduced with the decrease of dendritic segregation.
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