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01-11-2014 | Issue 11/2014

Journal of Materials Engineering and Performance 11/2014

The Influence of Fe Content on the Mechanical Properties of NiAl Coatings Processed In-Situ

Journal:
Journal of Materials Engineering and Performance > Issue 11/2014
Authors:
C. Brunetti, G. Pintaude, A. S. C. M. d’Oliveira

Abstract

NiAl Plasma Transferred Arc coatings can be processed by in-situ synthesis of the aluminide during the deposition of mixtures of Ni and Al powders. This procedure allows to deposit compositions that otherwise would exhibit low weldability. The strong metallurgical bond of coatings involves the formation of a weld pool. It is therefore expected for the composition of the processed coatings to be influenced both by the deposited and base material, besides processing parameters. This study analyzed the impact of the deposition current on the point defect structure in the B2NiAl-ordered structure and consequently on the coating hardness and indentation modulus. Mixtures of 65 at.%Ni and 35 at.%Al were prepared and deposited on carbon steel and stainless steel plates. Deposition current ranging from 70 to 150 A was used to induce different Fe content in the coatings. Results showed that increasing deposition current increased dilution with substrate but contrary to observations on metallic coatings, an increase of hardness and indentation modulus was measured. The hypothesis that the measured behavior is related to the point defect structure of the ordered phase, B2-NiAl, is put forward. The Fe content determined the density and type of point defects: vacancies, anti-sites Al or Ni. A better understanding on the mechanisms controlling the properties of the aluminide PTA coatings with increasing deposition current is achieved: hardness exhibiting a direct correlation with the point defect structure and the indentation modulus a strong dependence on the microstructure.

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