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Published in:
2018 | OriginalPaper | Chapter
Metallurgical Controlling of La in a Superalloy
Authors : Yong-ji Niu, Hai-wen Liu, Zhi-wei Zhang, Ning An, Yang Gao, Jian-jun Tian
Published in: High Performance Structural Materials
Publisher: Springer Singapore
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Abstract
In this paper, the burning law of La in VIM + ESR double-smelting-processing was studied in an alloy containing La. The results showed that the added La was almost burn out when added in after the refining in a vacuum induction melting process. However, when La was added at the end of smelting and before tapping, La can be effectively preserved. The burning rules of electroslag remelting slag system of CaF2:Al2O3, CaF2:Al2O3:CaO and CaF2:Al2O3:CaO:La2O3 was examined, and the results showed that the recovery rate of the first two slag series La was between 13 and 19%, and the burning loss of the two slag series La was not very different. The recovery rate of La in the slag system with La2O3 was 10–13%, the loss of La was significantly over the previous two large slag systems. But in terms of the La uniform in different parts of alloy ingot the slag containing La2O3 was the best.