Fabrication of composite layer containing TiN and TiC particles on the surface of steel by TIG

The possibility of fabrication of composite layer containing TiN and TiC on the surface of AISI 1045 steel by TIG (Tungsten Inert Gas) welding process was examined. In order to do this, once the powder of Ferro-Titanium and sodium silicate adhesive by blowing nitrogen and another time a powder containing graphite powder and Ferro- Titanium were bound on the surface of steel in pre deposited state and then surface melting through TIG process was conducted. Microstructural examination by optical microscope and SEM (scanning electron microscope), micro hardening and XRD (X-ray diffraction) were conducted on the created surfaces. The results elicit the formation of cubic titanium nitride through a reaction between Ferro-Titanium and Nitrogen and cubic titanium carbide through a reaction between graphite powder and Ferro-Titanium in the melt pool. The studies showed that the carbide and nitride particles were uniformly scattered in the composite coat. Since these particles were created and uniformly scattered in the matrix, the created composite films had high levels of hardness (about 50 HRC).

کلیدواژه ها:

TiN ، TiC ، Composite layer ، steel 1045 AISI and TIG