Characterization on Duplex Treated Coating Fabricated by Laser Cladding and Active Screen Plasma Nitriding
In order to enhance the performances of laser remanufacturing part, we combined laser cladding with active screen plasma nitriding duplex treatment to repair metal part. The microstructure, phase structure and micro-hardness of duplex treated coating were investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD) and micro-hardness tester. Wear tests were carried out on reciprocating wear tester under dry sliding condition. The results show that the white layer and the nitrogen diffusion layer were formed after nitriding treatment. The duplex treated coating consists mainly of γ-Fe, CrN, Fe4N and Fe3N. The duplex treated coating improved not only surface hardness but also wear resistance.
X. D. Zhang et al., "Characterization on Duplex Treated Coating Fabricated by Laser Cladding and Active Screen Plasma Nitriding", Applied Mechanics and Materials, Vol. 69, pp. 93-98, 2011