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Dendritic microstructure in argon atomized superalloy powdersThe dendritic microstructure of atomized nickel base superalloy powders (Ni-20 pct Cr, NIMONIC-80A, ASTROALOY, and ZHS6-K) was studied. Prealloyed vacuum induction melted ingots were argon-atomized, the powders were cooled to room temperature, and various powder-size fractions were examined by optical metallography. Linear correlations were obtained for the powder size dependence of the secondary dendrite arm spacing, following the expected d-alpha (R) to the m power dependence on the particle size for all four superalloy compositions. However, the Ni-20 pct Cr alloy, which had much coarser arm spacing as compared to the other three alloys, had a much larger value of m.
Document ID
19870036845
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Tewari, S. N.
(NASA Lewis Research Center Cleveland, OH, United States)
Kumar, Mahundra
(Defence Metallurgical Research Laboratory Hyderabad, India)
Date Acquired
August 13, 2013
Publication Date
November 1, 1986
Publication Information
Publication: Metallurgical Transactions A - Physical Metallurgy and Materials Science
Volume: 17A
ISSN: 0360-2133
Subject Category
Metallic Materials
Accession Number
87A24119
Distribution Limits
Public
Copyright
Other

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