Effect of Self-shielded Flux Cored Wire Surfacing and In-situ Synthesis TiB2-TiC Particles on Microstructure and Properties of Surfacing Alloy

The self-shielded flux cored wire was used to test the surface of Q235 steel, and the Fe-Cr-C-B-Ti alloy was prepared by adjusting the content of Ti in the flux cored wire.The change rule of mechanical properties of surfacing alloy was obtained through hardness and wear test. The phase composition and microstructure of the alloy were investigated by X ray diffraction (XRD) and scanning electron microscopy (SEM).The results indicate that with the increase of Ti content, TiC and TiB2 hard phase particles are formed in the surfacing layer, and TiC is preceded by TiB2 production.A large number of dispersed TiC and TiB2 can play an important role in the wear process and wear resistance of the deposited metal. The hardness of the surfacing layer is increased from 56.5HRC to 66HRC, and the wear loss weight is decreased from 0.5772g to 0.0487g when the mass fraction of Ti in the surfacing alloy is increased from 0.15% to 1.43%.