Title: Structure and properties of HVOF-sprayed and PTA-welded cermet hard phase reinforced Fe-matrix-based coatings

Authors: Priit Kulu; Arkadi Zikin; Andrei Surženkov; Riho Tarbe

Addresses: Department of Materials Engineering, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia ' Laser Surface Engineering Department, Nutech GmbH, Ilsahl 5, D-24536, Neumünster, Germany ' Department of Materials Engineering, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia ' Department of Materials Engineering, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia

Abstract: The aim of this study is to elaborate new composite coatings based on the hardmetal/cermet hard pahase metallic-iron-based matrix for the heavy abrasive wear conditions. WC-based hardmetal and Cr-based cermet powders, produced by disintegrator milling, were used. Commercial Cr-Ni-steel and FeCrSiB alloy powders were used as matrix materials. Optimal content of hard phase (40 vol.%) was selected. For deposition of coatings, high-velocity oxy-fuel (HVOF) spraying and plasma transferred arc (PTA) hardfacing were used. Three different wear testing methods namely abrasive rubber wheel wear (ARWW), abrasive erosive wear (AEW) and abrasive impact wear (AIW) were studied. Wear rates and relative wear resistance values were determined. As a result, the advantages of experimental composite coatings in comparison with commercial powder-based coatings were demonstrated.

Keywords: reinforced coatings; composite coatings; hard phase; cermet; HVOF spraying; high velocity oxyfuel; PTA welding; plasma transferred arc; microstructure; abrasive wear; iron based matrix; hardfacing; wear testing; abrasive rubber wheel wear; abrasive erosive wear; abrasive impact wear; wear rate; wear resistance.

DOI: 10.1504/IJMMP.2014.061054

International Journal of Microstructure and Materials Properties, 2014 Vol.9 No.1, pp.4 - 14

Available online: 24 May 2014 *

Full-text access for editors Access for subscribers Purchase this article Comment on this article