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Oxidation of Metals

, Volume 90, Issue 1–2, pp 135–151 | Cite as

Dependence on the Chromium Content of the High-Temperature Oxidation Behavior of Ta-Rich Nickel-Based Cast Alloys

  • Patrice Berthod
  • Zohra Himeur
Original Paper
  • 110 Downloads

Abstract

The high-temperature stability of primary tantalum carbides is a problem of importance for chromium-rich cast alloys, based on cobalt or nickel. The focus of this study was nickel-based alloys, as these alloys are particularly sensitive to a lack of TaC in the as-cast state and by dissolution due to high-temperature exposure. In this work, a possible way for promoting the formation of many TaC precipitates by changing from the usual 30 wt% chromium content was investigated. Five alloys with Cr content varying from 10 to 50 wt% were prepared and then subjected to microstructure characterization and to oxidation tests. In contrast with what was expected, decreasing the Cr content in comparison with the Ni–30Cr–0.4C–6Ta reference alloy did not succeed in obtaining more TaC precipitates, but instead had the opposite effect. Concerning the high-temperature oxidation behavior at 1127 and 1237 °C, loss of resistance was observed only for a Cr content at the lower level of 10 wt%. It was noticed that a subscale CrTaO4 developed during oxidation and seemed to promote oxide spallation during cooling.

Keywords

Cast nickel-based alloys High tantalum content Varying chromium content High temperature oxidation 

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2017

Authors and Affiliations

  1. 1.Faculty of Science and TechnologiesUniversity of LorraineVandoeuvre-lès-NancyFrance
  2. 2.Department CP2S, CNRS, Institut Jean Lamour (UMR 7198)University of LorraineVandoeuvre-lès-NancyFrance

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