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Characterization of macrosegregation in ESR IN-718Aspects of macrosegregation theory, such as dendrite arm spacing, pool profile and mushy zone depth are beneficial to developing consumable melting process for Ion Nickel IN-718, Electro-Slag Refining, especially ESR. Aspects of microsegregation theory, such as correlation of dendrite arm spacing with heat transfer mechanisms and local solidification time, are used to minimize remnant dendritism in both ESR and Vacuum Arc Remelting VAR IN-718. Specifically, ESR IN-718 must be optimized by developing practices which maximize ingot cooling rate and minimize the steepness of the solidus and liquidus isotherms. The knowledge concerning macrosegregation in consumable melted IN-718 is in the form of correlations. Since the isotherm steepness is undoubtedly involved, investigations which include a microgravity environment might separate microsegregation effects from macrosegregation effects. Accounting for the effects of gravity and density differences between the metal pool and the interdendritic fluid, in combination with the pool and mushy zone profiles, can lead to improved melting solidification practices for IN-718, and allow prediction of macrosegregation tendency to be incorporated into high temperature alloy design.
Document ID
19840026527
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Domingue, J. A.
(Special Metals Corp. New Hartford, NY, United States)
Yu, K. O.
(Special Metals Corp. New Hartford, NY, United States)
Flanders, H. D.
(Special Metals Corp. New Hartford, NY, United States)
Date Acquired
August 12, 2013
Publication Date
September 1, 1984
Publication Information
Publication: NASA. Lewis Research Center Fundamentals of Alloy Solidification Appl. to Industrial Processes
Subject Category
Metallic Materials
Accession Number
84N34598
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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