INVESTIGATIONS ON THE GROWTH MECHANISMS OF alpha -Cr2O3 ON Ni-BASE ALLOYS WITH AND WITHOUT Y2O3 DISPERSIONS.

T. A. Ramanarayanan, R. Petkovic-Luton

Research output: Contribution to journalArticle

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Abstract

The growth kinetics of Cr//2O//3 scales on the Y//2O//3 dispersion containing Ni-base alloy MA754 at low oxygen partial pressure have been compared with the corresponding growth rates on Ni-30 Cr and on Ni-30 Cr-0. 5 Ti alloys in the 1000-1125 degree C temperature range. In the dispersion containing alloy, the growth kinetics are slower by a factor of 12-14, the Ni-30 Cr and Ni-30 Cr-0. 5 Ti alloys exhibiting similar growth rates. Microstructural evidence does not support mechanisms for growth rate reduction suggested by earlier investigators based on blocking effects of dispersoid particles or dispersoid-assisted generation of a fine-grained Cr//2O//3 scale. Rather, the present evidence supports a model based on yttrium doping.

Original languageEnglish (US)
Pages (from-to)402-409
Number of pages8
JournalBerichte der Bunsengesellschaft/Physical Chemistry Chemical Physics
Volume89
Issue number4
DOIs
StatePublished - 1985
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)

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