文献类型：期刊文献

英文题名：Effect of a MgO–CaO–ZrO2-based refractory on the cleanliness of a K4169 Ni-based superalloy

作者：Zhao, Yudong Wang, Linzhu Chen, Chaoyi Li, Junqi Li, Xiang

第一作者：Zhao, Yudong

机构：[1] School of Materials and Metallurgy, Guizhou University, Guizhou, Guiyang, 550025, China; [2] Department of Materials & Metallurgy Engineering, Guizhou Institute of Technology, Guizhou, Guiyang, 550003, China

第一机构：School of Materials and Metallurgy, Guizhou University, Guizhou, Guiyang, 550025, China

年份：2023

卷号：49

期号：1

起止页码：117-125

外文期刊名：Ceramics International

收录：EI(收录号：20223912785829);Scopus(收录号：2-s2.0-85138528635)

语种：英文

外文关键词：Alumina - Aluminum oxide - Chromium alloys - Energy dispersive spectroscopy - Liquids - Melting - Nickel alloys - Scanning electron microscopy - Silicon - Silicon alloys - Superalloys - Titanium alloys - Titanium nitride - Zircaloy - Zirconia

摘要：Laboratory experiments were carried out to study the effect of a MgO–CaO–ZrO2-based refractory (MCZ refractory) on the cleanliness of a K4169 Ni-based superalloy. The chemical composition and characteristics of the refractory, alloy, and inclusions were analysed by X-ray fluorescence (XRF), X-ray diffraction (XRD), and scanning electron microscopy–energy-dispersive spectroscopy (SEM–EDS). Characterisation results indicated that the CaZrO3 phase was stable, the amount of the spinel phase increased whereas that of the MgO phase decreased, and Ca2Al2SiO7 and Ca2SiO4 transformed into Ca3Ti8Al12O37 and CaSiO3, respectively, in the refractory during the melting of the Ni-based superalloy. In addition, a new phase of Mg8Cr16O32 was simultaneously formed. The MCZ refractory penetrated the liquid alloy and reacted with it, which increased the Mg and Ca contents of the alloy. The erosion depth of the refractory in the alloy was more than 20 μm after melting for 100 min. Inclusions composed of MgO–Al2O3-TixOy wrapped with TiN were observed in the alloy after melting in the MCZ refractory. The inclusions were large, numerous, and distributed inhomogeneously in the alloy near the side and bottom of the refractory. The chemical reactions among the refractory, liquid alloy, and inclusions were analysed, and FactSage software was used to investigate these interactions. The effect of the dissolution of the MCZ refractory on the composition and transformation of the liquid alloy and inclusion was estimated. The thermodynamic results agreed well with the experimental results. ? 2022