The effect of VAR process parameters on white spot formation in INCONEL1 718

A 20 inch diameter VAR ingot of Inconel 718 was produced at Special Metals Wiggin Limited (Hereford) under conditions of abnormally long arc gap. It was sectioned and analyzed in the as-cast state. White spots were found, along with unusual macrostructural features at the ingot surface. The experime...

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Bibliographic Details
Published inJournal of materials science Vol. 39; no. 24; pp. 7169 - 7174
Main Authors WANG, X, BARRATT, M. D, WARD, R. M, JACOBS, M. H
Format Conference Proceeding Journal Article
LanguageEnglish
Published Heidelberg Springer 15.12.2004
Springer Nature B.V
Subjects
Applied sciences
Exact sciences and technology
Ingot casting
Ingots
Materials science
Metals. Metallurgy
Nickel base alloys
Niobium
Process parameters
Superalloys
Nickel base alloys
Vacuum arc remelting
Formation mechanism
Inconel
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Summary:A 20 inch diameter VAR ingot of Inconel 718 was produced at Special Metals Wiggin Limited (Hereford) under conditions of abnormally long arc gap. It was sectioned and analyzed in the as-cast state. White spots were found, along with unusual macrostructural features at the ingot surface. The experimental results are presented and discussed in relation to possible formation mechanisms, and it is shown that the level of niobium found in these white spots was too low to be explained by conventional mechanisms of formation.
ISSN:0022-2461
1573-4803
DOI:10.1023/B:JMSC.0000048728.85832.44