| METALS AND METAL MATRIX COMPOSITES |
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| Evaporation Behavior of Alloying Elements and Calculation of Molten Pool Temperature in Electron Beam Smelting of a New Ni-Co Based Superalloy |
| WANG Yilin1.2, TAN Yi1,2,*, CUI Chuanyong3, YOU Xiaogang1,2, ZHAO Longhai1,2, CUI Hongyang1,2, LI Pengting1,2, LI Xiaona1,4
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1 School of Materials Science and Engineering, Dalian University of Technology, Dalian 116024 , Liaoning, China
2 Key Laboratory for Energy Beam Metallurgy and Advanced Materials Preparation of Liaoning Province, Dalian 116024, Liaoning, China
3 Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences,Shenyang 110016, China
4 Key Laboratory of Material Modification by Laser, Ion and Electron Beam Ministry of Education, Dalian University of Technology, Dalian 116024, Liaoning, China |
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Abstract A new Ni-Co based superalloy was prepared by electron beam smelting. The microstructure, composition, volatilization behavior of alloy elements and temperature distribution of molten pool surface were studied. The results show that with the increase of melting power, the microstructure of ingot is finer and the mass loss is larger. After smelting, the mass fractions of Cr and Al decrease, and the mass fraction of the remaining elements increase. At the same temperature, the saturated vapor pressure of pure Al element is the highest and that of W is the lowest. The melt system was simplified to a Ni-Cr-Co ternary alloy model to study its volatilization behavior. The activity coefficients and activities of alloying elements can be predicted by Miedema model. The theoretical volatilization rates of Ti, Mo and W elements are very small, and the volatilization loss can be ignored basically. The volatilization rate of Al element was calculated by introducing activity coefficient compensation factor. The ave-rage temperature of the molten pool with the melting power of 10 kW, 12 kW and 14 kW is 1 863.6 K, 1 890.6 K and 1 904.3 K respectively, and the corresponding maximum temperature of the molten pool is 2 368.1 K, 2 402.4 K and 2 419.8 K.
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Published: 10 January 2023
Online: 2023-01-31
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| Fund:National Key Research and Development Project(2019YFA0705300), the National Natural Science Foundation of China(52004051), and the Innovation Team Project for Key Fields of Dalian(2019RT13). |
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2023, Vol. 37 
