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Effects of Different Hot Working Techniques on Inclusions in GH4738 Superalloy Produced by VIM and VAR

by Zhengyang Chen 1,2, Shufeng Yang 1,2,*, Jingshe Li 1,2, Hao Guo 1,2 and Hongbo Zheng 1,2
1
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2
Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, Beijing 100083, China
*
Author to whom correspondence should be addressed.
Materials 2018, 11(6), 1024; https://doi.org/10.3390/ma11061024
Received: 22 April 2018 / Revised: 8 June 2018 / Accepted: 13 June 2018 / Published: 15 June 2018
Hot working is a key process in the production of superalloys; however, it may result in the formation of inclusions that affect the superalloy performance. Therefore, the effects of hot working on inclusions in a superalloy must be studied. GH4738 superalloy was manufactured, herein, by vacuum induction melting and vacuum arc remelting. Hot working was performed by unidirectional drawing, upsetting and drawing, and upsetting/drawing with radial forging. The types and distributions of inclusions after these three hot working processes and those in an original ingot were analyzed using scanning electron microscopy, energy dispersive spectroscopy, and Image-Pro Plus software. The results showed that the melting technology essentially determined the inclusion types in GH4738. Four types of inclusions were found in the experiments: TiC–TiN–Mo–S composite, TiC–TiN composite, Ce–Mo–S composite, and SiC inclusions. In the case of hot working by unidirectional drawing, the average inclusion size first decreased, and then increased from the center to the edge. In the case of upsetting and drawing, and upsetting/drawing with radial forging, the average inclusion size decreased from the center to the edge. View Full-Text
Keywords: superalloy; melting; hot working; inclusion superalloy; melting; hot working; inclusion
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Chen, Z.; Yang, S.; Li, J.; Guo, H.; Zheng, H. Effects of Different Hot Working Techniques on Inclusions in GH4738 Superalloy Produced by VIM and VAR. Materials 2018, 11, 1024.

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