Effect of interaction of refractories with Ni-based superalloy on inclusions during vacuum induction melting  

作　　者：Xiao-yong Gao Lin Zhang Xuan-hui Qu Xiao-wei Chen Yi-feng Luan 

机构地区：[1]Beijing Advanced Innovation Center for Materials Genome Engineering,Institute for Advanced Materials and Technology,University of Science and Technology Beijing,Beijing 100083,China

出　　处：《International Journal of Minerals,Metallurgy and Materials》2020年第11期1551-1559,共9页矿物冶金与材料学报（英文版）

基　　金：This work is financially supported by the Natural Science Foundation of China(No.51974029);the Natural Science and Technology Major Project(No.2017-VI-0014-0086);and Fundamental Research Funds for the Central Universities(Nos.FRF-AT-19-013 and FRF-NP-19-003).

摘　　要：This study documents laboratory-scale observation of the interactions between the Ni-based superalloy FGH4096 and refractories.Three different crucibles were tested—MgO,Al2O3,and MgO–spinel.We studied the variations in the compositions of the inclusions and the alloy–crucible interface with the reaction time using scanning electron microscopy equipped with energy dispersive X-ray spectroscopy and Xray diffraction.The results showed that the MgO and MgO–spinel crucibles form MgO-containing inclusions(Al–Mg oxides and Al–Mg–Ti oxides),whereas the inclusions formed when using the Al2O3 crucible are Al2O3 and Al–Ti oxides.We observed a new MgAl2O4 phase at the inner wall of the MgO crucible,with the alloy melted in the MgO crucible exhibiting fewer inclusions.No new phase occurred at the inner wall of the Al2O3 crucible.We discuss the mechanism of interaction between the refractories and the Ni-based superalloy.Physical erosion was found to predominate in the Al2O3 crucible,whereas dissolution and chemical reactions dominated in the MgO crucible.No reaction was observed between three crucibles and the Ti of the melt although the Ti content(3.8wt%)was higher than that of Al(2.1wt%).

关 键 词：FGH4096 superalloy vacuum induction melting CRUCIBLE INCLUSION Mg/O ratio 

分 类 号：TG132.3[一般工业技术—材料科学与工程] TQ175.1[金属学及工艺—合金]