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Structure/property evaluation and comparison between shock-wave consolidated and hot-isostatically pressed compacts of RSP pyromet 718 alloy powders

Thadhani, N. N. and Mutz, A. H. and Vreeland, T., Jr. (1989) Structure/property evaluation and comparison between shock-wave consolidated and hot-isostatically pressed compacts of RSP pyromet 718 alloy powders. Acta Metallurgica, 37 (3). pp. 897-908. ISSN 0001-6160. http://resolver.caltech.edu/CaltechAUTHORS:20150123-130642945

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Abstract

Shock-wave processing of a nickel-based superalloy (Pyromet 718) powder is explored and compared to conventional hot-isostatic processing. The shock consolidated powder has extensively deformed particle interiors, A fine microcrystalline phase was observed at interparticle regions, and is attributed to rapid solidification of melt formed during the consolidation process. The shock consolidated material has a yield strength of 1 GPa prior to heat treatment, which is at least 10% higher than that of the hot isostatically pressed alloy. A high density of very fine disk-shaped γ″ precipitates nucleate in the shock consolidated material after solution treatment and upon aging at 620°C for 8–40 h. A lower density of coarser precipitates nucleate in the hot-isostatically pressed alloy subjected to similar thermal aging conditions. The shocked and heat treated alloy exhibits a 20% higher yield strength and a 40% higher UTS than the hot isostatically pressed and heat treated alloy, with comparable ductility. The improvement is attributed to a finer intraparticle grain size, very fine grained interparticle material, and a higher density of very fine and uniformly dispersed y″ precipitates resulting from faster nucleation kinetics in the shock consolidated material.


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http://dx.doi.org/10.1016/0001-6160(89)90016-3 DOIArticle
http://www.sciencedirect.com/science/article/pii/0001616089900163PublisherArticle
Additional Information:© 1989 Pergamon Press plc. Received 5 January 1988; in revised form 10 June 1988. This work was supported in part by the National Science Foundation under the Materials Research Group Grant DMR 8421119. The Pyromet 718 superalloy powder and the hot-isostatically-pressed alloy were provided by Dr Sunil Widge, Carpenter Technology, Reading, Pennsylvania. Mr Michael A. Long produced the shock consolidation samples at Professor Thomas J. Ahrens' facilities in the Caltech Seismological Laboratories. The authors are also grateful to Professor Marc A. Meyers, New Mexico Institute of Mining and Technology, for reviewing the manuscript and providing helpful comments.
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NSFDMR 8421119
Record Number:CaltechAUTHORS:20150123-130642945
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20150123-130642945
Official Citation:N.N. Thadhani, A.H. Mutz, T. Vreeland Jr, Structure/property evaluation and comparison between shock-wave consolidated and hot-isostatically pressed compacts of RSP pyromet 718 alloy powders, Acta Metallurgica, Volume 37, Issue 3, March 1989, Pages 897-908, ISSN 0001-6160, http://dx.doi.org/10.1016/0001-6160(89)90016-3. (http://www.sciencedirect.com/science/article/pii/0001616089900163)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:54024
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:23 Jan 2015 22:31
Last Modified:23 Jan 2015 22:31

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