Table of Contents
Conference Papers in Science
Volume 2015, Article ID 276374, 10 pages
http://dx.doi.org/10.1155/2015/276374
Conference Paper

Effect of Dilution on Microstructure and Wear Resistance of a Fe-Based Hardfacing Alloy with a High Amount of Carbide-Forming Elements

1Dipartimento di Meccanica, Politecnico di Milano, Milan, Italy
2Bernex Bimetallic S.r.o., Modrice Bei Brno, Czech Republic

Received 1 August 2014; Revised 23 September 2014; Accepted 7 October 2014

Academic Editor: Martin Dienwiebel

This Conference Paper is based on a presentation given by M. Vedani at “European Symposium on Friction, Wear, and Wear Protection” held from 6 May 2014 to 8 May 2014 in Karlsruhe, Germany.

Copyright © 2015 L. Rovatti et al. 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

Hardfacing is a widely diffused technique adopted to increase service life of parts for heavy-duty applications. Even though hardfacing alloys feature optimized chemistry and microstructure for specific service conditions, dilution with substrate modifies the resulting properties along a significant fraction of the deposit thickness. In particular, C and B diffusion to the substrate alters hypereutectic alloys reducing the carbide-forming ability and modifying the solidification sequence. In the present paper, the effect of dilution on a hypereutectic Fe-C-B based alloy containing Cr and Mo was investigated. The effect of dilution on the reference alloy was studied by producing laboratory castings with an increased amount of Fe, up to 50 mass %. The obtained results were compared with the dilution of the hardfacing alloy cast on steel substrates. The microstructural evolution was analyzed by XRD (X-ray diffraction), differential scanning calorimetry (DSC), optical microscopy (OM), and scanning electron microscopy (SEM), whereas mechanical behaviour was evaluated by hardness measurements and wear resistance by pin-on-disc tests.