Effect of Magnetic Treatment on the Microstructure and Strength of WC–Co Detonation-Sprayed Coatings

Abstract

The influence of magnetic treatment on the destruction of the WC–Co detonation coating–St3 steel substrate system is studied in bending tests. It is established that magnetic treatment leads to the redistribution of elements in the coating–substrate contact area. It is shown that magnetic treatment improves the mechanical properties of the coating–substrate system: plastic strain of the system increases from 0.15% to 0.35% when coating starts cracking and stresses developed at the moment of destruction increase from 700 to 1300 MPa. The improvement of properties is due to higher quality of adhesion at the coating–substrate interface resulting from diffusion-controlled redistribution of elements during magnetic treatment.