Abstract:
Using self-made high chromium cast iron flux-cored welding tape as welding material, single-layer single-pass surfacing tests were carried out by non-melting inert gas arc welding (TIG) on low carbon steel plate. The effect of in-situ synthesis TiC on the microstructure and properties of surfacing metal was studied by adding different mass fraction (0-5.2%) of ferro-titanitum powder in the flux-cored welding tape powder. The results show that after adding ferro-titanium powder to the flux-cored welding tape powder, there was in-situ synthesis TiC phase in the surfacing metal except Cr
7C
3 hard phase; the size of Cr
7C
3 decreased, the distribution was relatively uniform, and the number increased significantly. When the mass fraction of ferro-titanium powder in the powder was 5.2%, the refinement of Cr
7C
3 in the surfacing metal was the most obvious, and the distribution was the most uniform. With increasing ferro-titanium powder content in the flux-cored welding tape powder, the hardness and wear resistance of the surfacing metal increased. The TiC synthesized in situ in the liquid metal could be used as the heterogeneous nucleation core of Cr
7C
3, which reduced the nucleation resistance of Cr
7C
3 and thus refined Cr
7C
3.