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A study of the dynamic impact behaviour of IN 718 and ATI 718Plus® superalloys
University of Manitoba, Department of Mechanical Engineering, Winnipeg, Canada.ORCID iD: 0000-0001-9187-4720
University West, Department of Engineering Science, Division of Welding Technology. (PTW)ORCID iD: 0000-0001-9065-0741
University of Manitoba, Department of Mechanical Engineering, Winnipeg, Canada.
2019 (English)In: Philosophical Magazine, ISSN 1478-6435, E-ISSN 1478-6443, Vol. 99, no 4, p. 419-437Article in journal (Refereed) Published
Abstract [en]

The dynamic impact response of IN 718 and ATI 718Plus®, in both the solution heat treated and age-hardened conditions, were investigated at different deformation temperatures and strain rates using a direct impact Hopkinson pressure bar. Analyses of the results provide a vital but previously not reported information that the ATI 718Plus® offers a higher resistance to damage during high strain rate ballistic impact deformation compared to the most widely used Iron-nickel based superalloy, Inconel 718. ATI 718Plus® showed higher strain hardening and strain rate sensitivity, in both heat treatment conditions, than IN 718. The difference in the deformation behaviour of both alloys, in the annealed condition, is attributable to the compositional modification in ATI 718Plus® which has been reported to lower its stacking fault energy and increases the tendency for deformation twinning. However, in the age-hardened condition, the difference is believed to be related to the disparity in the operative strengthening mechanism, of the precipitates present in both alloys. Furthermore, a higher susceptibility to strain location and the formation of adiabatic shear band, in aged IN 718, is attributable to the stronger temperature-softening characteristics observed in the alloy and to the limited strain hardening tendency under dynamic impact loading. © 2018, © 2018 Informa UK Limited, trading as Taylor & Francis Group.

Place, publisher, year, edition, pages
Taylor and Francis Ltd. , 2019. Vol. 99, no 4, p. 419-437
Keywords [en]
Deformation, Dynamics, Iron alloys, Mechanical properties, Nickel alloys, Scanning electron microscopy, Shear bands, Strain hardening, Superalloys, Transmission electron microscopy, Twinning, Compositional modification, Damage, Deformation properties, Deformation temperatures, Heat treatment conditions, Stacking fault energies, Strain hardening and strain rate sensitivity, Strengthening mechanisms, Strain rate
National Category
Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering
Identifiers
URN: urn:nbn:se:hv:diva-13177DOI: 10.1080/14786435.2018.1540891ISI: 000455480300002Scopus ID: 2-s2.0-85056162234OAI: oai:DiVA.org:hv-13177DiVA, id: diva2:1267609
Note

Published online: 07 Nov 2018

Funder: Natural Sciences and Engineering Research Council of Canada

Available from: 2018-12-03 Created: 2018-12-03 Last updated: 2019-02-04Bibliographically approved

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Andersson, Joel

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