TiC particle reinforced Fe-based composite coatings processed by submerged-arc welding adding of alloy powder

TiC particle reinforced Fe-based composites coatings were in situ synthesized on surface of Q235 steel by submerged arc welding of the compacts of mixed ferrotitanium,ferrochromium,iron and carbon powers,etc.The coating was without cracks,inclusions,porosity and other defects,no need to preheat before welding and slow cooling after welding.Microstructures of the coating were observed by scanning electron microscope(SEM),X-ray diffraction(XRD) and Energy Disperse Spectroscopy(EDS),and microhardness was measured by microhardness tester.The results indicated that the fine TiC particles were formed by using submerged arc welding process and distributed in the matrix,and the particles sizes were under 2 μm.The microstructure of the coating consisted of TiC particles,martensite and austenite,and the microhardness of the coating was up to 601 HV0.2,which was about 3 times of that of the based metal.