MICROSTRUCTURAL CHARACTERISTIC OF N_2 SHIELDING GAS IN COATING FeCrC COMPOSITE TO THE SURFACE OF AISI 1030 STEEL WITH PTA METHOD

摘要

In this study, FeCrC powder was alloyed on the surface of AISI 1030 steel with FeCrC powder having 70% Cr ratio with the Plasma Transferred Arc Welding Method. In the coating process performed with the Plasma Transferred Arc Welding Method, N_2 gas at 1-3-5% ratio was added to the shielding gas. The coating layer was analysed using optical microscope (OM), scanning electron microscope (SEM), X-ray diffractogram (XRD) and X-ray energy dispersive spectrometer (EDS). As a result of optical microscope and microstructure analyses, it was determined that the coating layer and the sub-layer were connected to each other metallurgical and there were austenite (γ), Fe-Cr, Fe_(23)(C)_6, and Cr_7C_3 phase and carbides and CrN in the structure.