Effect of sulfur on the solidification and segregation in Inconel 718 alloy

The effect of sulfur on the solidification and segregation in Inconel 718 alloy was studied. Sulfur is extremely depleted in the matrix, slightly dissolved in the Laves phase and NbC, and seriously segregated as sulfides. Except for the needle-like Y-phase ((Nb, Ti)2SC), a globular sulfide was newly...

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Bibliographic Details
Published in:Materials letters 1997-06, Vol.31 (3-6), p.195-200
Main Authors: Sun, W.R., Guo, S.R., Lu, D.Z., Hu, Z.O.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Defects and impurities in crystals
microstructure
Exact sciences and technology
Impurities: concentration, distribution, and gradients
Impurity concentration, distribution, and gradients
Inconel 718
Materials science
Metals. Metallurgy
Methods of crystal growth
physics of crystal growth
Physics
Segregation
Solidification
Structure of solids and liquids
crystallography
Sulfide
Sulfur
Superalloy
Theory and models of crystal growth
physics of crystal growth, crystal morphology and orientation
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Summary:The effect of sulfur on the solidification and segregation in Inconel 718 alloy was studied. Sulfur is extremely depleted in the matrix, slightly dissolved in the Laves phase and NbC, and seriously segregated as sulfides. Except for the needle-like Y-phase ((Nb, Ti)2SC), a globular sulfide was newly found to form following the precipitation of the Laves phase. The precipitation of sulfides is speculated to be avoided when the sulfur content is low enough and most of the sulfur in the alloy is dissolved in the Laves phase. Sulfur has diverse effects on the solidification behavior of the alloys; the mechanism is discussed in the text.
ISSN:0167-577X
1873-4979
DOI:10.1016/S0167-577X(96)00266-2