Oxidation behaviour of a developmental nickel-based alloy and the role of minor elements. (March 2022)

• Record Type: Journal Article
• Authors: Taylor, Mary; Ding, Rengen; Mignanelli, Paul; Hardy, Mark
• Is Part Of: Corrosion science. Volume 196(2022)
• Publication Date: 2022-03
• Subjects: Oxidation -- Nickel-based alloy -- Minor elements; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2021.110002
• Languages: English
• ISSNs: 0010-938X

Abstract

Abstract: The oxidation kinetics of a chromia forming development nickel-based superalloy over the temperature range of 700–850 °C under isothermal and 100 h thermal cycles are presented. The kinetics compare favourably with similar alloys and this is attributed to the formation of (Ti, Nb, Ta)(N, C, B) precipitates found throughout the alloy. Between 840 and 850 °C an increase in the oxidation kinetics was observed; attributed to the dissolution of the precipitates, releasing titanium, tantalum and niobium into the alloy matrix. The results are discussed in terms of potential effect of the presence of (N, C, B) phases and stability on the oxidation kinetics. Highlights: Isothermal and thermally cycled oxidation testing of a development Ni-based alloy from 700° to 850 °C up to 2000 h. Improved kinetics over comparable alloys. (Ti, NB, Ta)(N, C, B) precipitate complexes form throughout alloy, some nucleated on ZrO2 particles. Dissolution of the precipitates at 840 °C resulted in increased kinetics to that expected for the composition of the alloy.