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Delayed parabolic oxidation via transient thermal exposures on a polycrystalline nickel-based superalloy

Published version
Peer-reviewed

Repository DOI


Type

Article

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Authors

Wo, JWX 
Collins, DM 
Taylor, MP 
Hardy, MC 
Stone, HJ 

Abstract

Multiple oxides were observed during the transient oxidation stage of the polycrystalline Ni-based superalloy, RR1000, before a protective Cr2O3 scale formed. Thermogravimetric analysis, synchrotron grazing incidence X-ray diffraction, and electron microscopy were performed on samples subjected to isothermal exposures at 800 °C for up to 100 hours. Transient effects governed the early stages up to 40 hours. NiO, spinels (NiCr2O4, (Ni,Co)(Cr,Co)2O4), Cr2O3/(Cr0.88Ti0.12)2O3, NiTiO3, and CrTaO4 formed during the initial stage with pseudo-linear kinetics. At the onset of parabolic kinetics, extensive Cr2O3 and TiO2 growth dominated scale formation with the former emerging as the major passivating oxide.

Description

Keywords

4005 Civil Engineering, 40 Engineering, 4016 Materials Engineering, 4017 Mechanical Engineering

Journal Title

Corrosion Science

Conference Name

Journal ISSN

0010-938X

Volume Title

Publisher

Elsevier BV
Sponsorship
The authors are grateful to the Cambridge Trusts and Rolls-Royce plc for financial support. The provision of beamtime at the I11 instrument, Diamond Light Source is acknowledged under Proposal EE18972. JWXW acknowledges the support of the Natural Sciences and Engineering Research Council of Canada (NSERC), [funding reference number PGSD3-532682-2019]. Cette recherche a été financée par le Conseil de recherches en sciences naturelles et en génie du Canada (CRSNG), [numéro de référence PGSD3-532682-2019].
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