|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Energy Materials 2017: Materials for Coal-Based Power
||Evolution of Precipitates of 25Cr-20Ni-3Cu3WNbN Austenitic Heat Resistant Steel during 973K Aging
||Hansheng Bao, Zhengdong Liu, Zhengzong Chen, Zhaobo Tian
|On-Site Speaker (Planned)
The evolution of precipitates during 973K aging for different time was investigated by using SEM, back-scattered electron and TEM. NbCrN and MX was observed after solution treatment. The major precipitate along grain boundaries was M23C6, during early aging at 973K. After aging for 1000h, Laves phases precipitate along grain boundaries firstly with the shape of sphere. The flat-shaped Laves phases precipitate inside grain and become the major precipitate in the next aging stage. Meanwhile, the Cu-rich particles begin to precipitate inside grain, and the distribution of these particles can impede the tendency of Laves andM23C6 inside grain to coarsen. With increasing of the aging time, no marked difference in NbCrN is observed, containing the shape and dimension. And M23C6 began to precipitate adjoining to the edge of NbCrN after aging for short term and keep stable.
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