Numerical analysis on solidification process and heat transfer of FGH95 superalloy droplets during PREP

Huanming Chen, Benfu Hu, Yiwen Zhang, Quanmao Yu, and Huiying Li1)Materials Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China2)Physics and Electrical Information Engineering School, Ningxia University, Yinchuan 750021, China3)Central Iron and Steel Research Institute, Beijing 100081, China

摘 要：<正> In order to understand the relation between microstructure of superalloy powders and its solidification progress, the processing parameters are optimized during plasma rotating electrode processing (PREP). It was predicted from the results that the droplet velocities, droplet temperature, and fractional solidification with flight time about FGH95 superalloy droplet have been carried out based on Newtonian heat transfer formulation coupled with the classical heterogeneous nucleation and the specific solidification process. It has been found that the droplet dynamic and thermal behavior is strongly affected by the distribution of droplet diameters, the proportion of cooling atmosphere, but is relatively unaffected by the droplet superheat.

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