Table of Contents
ISRN Thermodynamics
Volume 2012 (2012), Article ID 308795, 7 pages
http://dx.doi.org/10.5402/2012/308795
Research Article

Avoiding or Promoting Graphite in Carbon-Rich Chromium-Containing CoNiFe Cast Alloys—Part 1: Preliminary Thermodynamic Exploration

Department of Chemistry and Physics of Solids and Surface, Institut Jean Lamour (UMR CNRS 7198), Faculty of Sciences and Technologies, University of Lorraine, Boulevard des Aiguillettes, BP 70239, 54506 Vandoeuvre-lès-Nancy, France

Received 2 February 2012; Accepted 2 March 2012

Academic Editors: A. Chagovetz and D. Chakrabarti

Copyright © 2012 Patrice Berthod. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The thermodynamic equilibria of alloys, based on Co, Ni, and Fe rich in chromium and carbon over a [500; 1500°C] range of temperature, were determined using thermodynamic calculations. The probable types of microstructures (hypo- to hypereutectic) as well as the phase present at high temperature (matrix network, types of carbides, presence or not of graphite) were predicted. From these results new chromium contents to either avoid or promote the presence of graphite were chosen and the as-cast microstructures of the corresponding real alloys were anticipated, before their elaboration and microstructure characterization in the second part of this work.