Effect of smelting process on cleanliness of FGH96 superalloy
GU Yu1,2, ZHAO Peng2,3, YUAN Yi2,3, YANG Shu-feng2,3
1. Beijing CISRI-GAONA Materials and Technology Co.,Ltd., Beijing 100083, China; 2. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China; 3. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Abstract：The effect of different smelting processes on cleanliness of powder superalloy was investigated. The effects of three smelting processes, vacuum induction melting(VIM), vacuum horizontal continuous casting(VHCC) and vacuum induction melting(VIM) + electroslag remelting(ESR), on the impurity element content and inclusions composition, morphology, size and quantity of FGH96 master alloy bars were studied by scanning electron microscopy and energy spectrometry in comparison. The results show that the powder master alloy prepared by VHCC or VIM+ESR duplex process has better cleanliness than that by VIM single process. The inclusions in the master alloy bars produced by all three smelting processes consist of oxide inclusions, carbonitride inclusions and carbon-nitride composite inclusions with oxide as the core. The number and size of inclusions in the master alloy bars prepared by VIM are significantly higher than those produced by VHCC and ESR. The number of inclusions in VHCC bars are the lowest, and uniformly distributed. The ESR bars have the smallest inclusions, but the highest number of inclusions at the edges. The quantity change trend of inclusions sieved from the powders produced by plasma rotating electrodes for three processes is basically consistent with that of the master alloy. VIM+ESR smelting process can effectively improve the cleanliness of FGH96 alloy bar and powder.
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2023, Vol. 33 
