In this work, the effect of Cr3C2 on the microstructure and properties of 310 coatings by plasma transfer arc welding was studied. The microstructure, composition, hardness and wear resistance of the coatings were analyzed by scanning electron microscope, EDS, X-ray diffractometer, microhardness tester and friction wear tester. The results show that when Cr3C2 is less, the coating is composed of columnar crystal and cellular crystal, mainly including (Fe, Ni) Fe3Ni2FeCr0.29Ni0.16C0.06Cr2Fe14C and CrFe7C0.45. With the increase of Cr3C2, the structure becomes dendrites and new phases Cr7C3 and Cr23C6 appeared. However, the crystallinity of 5% is poor and there is no obvious grain structure. The hardness of the coatings increases first and then decreases with the content of Cr3C2. The hardness with the content of 3% is the highest. The friction coefficient corresponds to the hardness and the main wear mechanism is abrasive wear and oxidation wear.
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