Study and Comparison of Microstructure, Hardness and Wear Resistance of Hardface Composite Clad Layers (TiC, TiCN) on Mild Steel Fabricated by FCAW

In this research, metal cored wire including ferroalloy materials was used and cladded by FCAW process with different shielding gases (as nitrogen and argon) on steel substrate. The chemical analysis examination showed that the nitrogen absorbed in sample that was fabricated with nitrogen gas shielding. Consequence of XRD pattern indicated that the Carbonitride phase (TiCN) precipitations appeared in weld metal (nitrogen gas) and titanium carbides (TiC) precipitate in (argon gas) samples. SEM examination results, revealed that the fine particles of TiCN and TiC precipitations sited in ferrite microstructure and the mapping of elements explained the homogeneously precipitates of elements and phases in microstructure. Also, the hardness value sample that fabricated with argon gas was lower than the sample that fabricated with nitrogen gas. The wear test (ASTM G65) result indicated that sample was being consist of TiCN had higher abrasive wear resistance than the other (TiC).