Segregation of Niobium During Electroslag Remelting Process
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Experiment was carried out after the process parameters were calculated by the model previously established. The relationship between interdendritic spacing and local solidification time (LST) mainly determined by process parameters was exposed. Furthermore, the extent of segregation was studied. The results indicate that LST and interdendritic spacing are the largest and the amount of Laves phase as a result of the niobium segregation is the highest in the center of the ingot, whereas the opposite results are obtained at the edge of ingot. The extent of element segregation and the amount of Laves phase can be reduced when appropriate parameters are used. Therefore, the duration of subsequent homogenization treatments for 718 is shortened and the alloy quality is improved.
Key wordselectroslag remelting Inconel 718 segregation local solidification time interdendritic spacing
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- Radavich John F. The Physical Metallurgy of Cast and Wrought Alloy718 [A]. Loria E A, eds. Superalloy 718-Metallurgy and Applications [C]. Warrendale: TMS, 1989. 229.Google Scholar
- Fleming M C. Solidification Processing [M]. New York: McGraw Hill Book Company, 1974.Google Scholar
- YANG Ai-min. Study of Structure Refinement and Optimization of Mechanical Proprieties for Superalloy K4169 [D]. Xi’ an: Northwestern Polytechnical University, 2002 (in Chinese).Google Scholar
- XIONG Yu-hua, LIU Wei, YANG Ai-min, et al. Effects of Ni-Al-Ti Refiner on Grain Structure and Mechanical Properties of Cast Superalloy K4169 [J]. Acta Metallurgica Sinica, 1999, 35(7): 689 (in Chinese).Google Scholar