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Refractory Hard Alloys Elaborated by Casting of Ternary (Co, Ni Fe)-30Cr-2.5 to 5 wt% C Compositions

¹ Faculty of Sciences and Technologies, University of Lorraine, Vandoeuvre-lès-Nancy, France
² Faculty of Sciences and Technologies, University of Lorraine, Vandoeuvre-lès-Nancy, France
³ Faculty of Sciences and Technologies, University of Lorraine, Vandoeuvre-lès-Nancy, France
⁴ Faculty of Sciences and Technologies, University of Lorraine, Vandoeuvre-lès-Nancy, France
⁵ Faculty of Sciences and Technologies, University of Lorraine, Vandoeuvre-lès-Nancy, France
⁶ Faculty of Sciences and Technologies, University of Lorraine, Vandoeuvre-lès-Nancy, France
⁷ Faculty of Sciences and Technologies, University of Lorraine, Vandoeuvre-lès-Nancy, France
⁸ Faculty of Sciences and Technologies, University of Lorraine, Vandoeuvre-lès-Nancy, France
⁹ Faculty of Sciences and Technologies, University of Lorraine, Vandoeuvre-lès-Nancy, France
¹⁰ Faculty of Sciences and Technologies, University of Lorraine, Vandoeuvre-lès-Nancy, France
¹¹ Faculty of Sciences and Technologies, University of Lorraine, Vandoeuvre-lès-Nancy, France

Journal of Materials Science and Chemical Engineering·Volume 03 (2015)·Pages 127–135·Published 19 June 2015·DOI10.4236/msce.2015.37017

Abstract

Three series of ternary alloys of the {M-30Cr-xC}-type with M = Co, Ni or Fe and x ranging from 2.5 to 5 wt% were elaborated by casting. Their microstructure characterizations by XRD and SEM show that very high volume fractions in chromium carbides (even more than 50%) may be obtained in a metallic matrix by this way. However graphite may also appear in very low quantities in the carbon-richest alloys. The hardness increases with the carbon content (up to 1000 Hv30kg) but it may be a little lowered when graphite is also present. The results show that very hard alloys may be simply obtained by casting of rather cheap elements.

KeywordsCast Co-Based AlloyCast Ni-Based AlloyCast Fe-Based AlloyChromium CarbidesHigh HardnessGraphite

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Refractory Hard Alloys Elaborated by Casting of Ternary (Co, Ni Fe)-30Cr-2.5 to 5 wt% C Compositions

Abstract

References (10)