Influence of the handling parameters on residual stresses of HVOF-sprayed WC-12Co coatings

摘要

In this research work HVOF WC-12Co coatings were deposited on C45 steel (1.0503) substrates. Unfavorable residual stresses can lead to delamination and spallation and thus have to be avoided by optimizing the handling parameters. This study investigates the influence of the following handling parameters: substrate temperature, number of overruns, stand-off distance, track pitch, and gun velocity on the residual stress and hardness. Additionally, the effect of post-treating the coating by means of surface grinding was determined. For the HVOF spraying experiments, fine agglomerated and sintered WC-12Co powders (2-10 mu m) with WC particles in the submicron range (400 nm) were chosen. It was determined that alterations of these handling parameters had significant effects on the residual stress and the hardness. (C) 2014 Elsevier B.V. All rights reserved.