Prepared Laser Cladding Ni-based/WC Composite Coating To Study The Organization And Performance

Many hydraulic components must be required to have a high hardness and high wear resistance, which the substrate is made of a very high demands. A hydraulic pump in the oil pan is to use 38 Cr Mo Al A hardening heat treatment, but it is expensive, and the post-processing is poor, and therefore proposes the use of laser cladding technology in some relatively good mechanical properties, cheap base cladding composite powder material obtained excellent cladding to improve the hardness and wear resistance to achieve the requirements, thereby replace 38 Cr Mo Al A in industrial production applications, to achieve high efficiency in technology and the economy.In this paper, used the entire apparatus of the present College of laser cladding laser machining center. On 45 steel surface prepared Ni60 A + 35WC-Ni composite powder laser cladding layer and Ni60 A + 50WC-Co composite powder laser cladding layer, Olympus microscope, scanning electron microscopy(SEM), EDS, X-ray diffraction(XRD), microhardness and wear tester and other equipment on the cladding layer of macro-morphology, microstructure, phase structure, hardness and wear resistance were tested analyzed and in-depth research. Prepared in multitrack laser cladding layer and double layer of the same material laser cladding layer, and the overlapping area overlapping microstructure were analyzed. It explained the mechanism of residual stress in the cladding layer, and explore the ways and means to eliminate residual stress and inhibition of cracks, holes and other defects.Ni60A + 35WC-Ni composite powder cladding phase mainly composed of γ-(Fe, Ni), Cr23C6, WC, W2 C, Cr4Ni15 W, Fe23(C, B) 6 and other components, Ni60 A + 50WC-Co composite powder laser cladding inner layer increases the new phase Co6W6 C and W2B5. Binding region of the plane there is a eutectic composition of silver and white with bright, white light and from tape to grow dendritic directional cladding, herringbone and other rod and eutectic. An upper cladding layer of the main flower, star and flake crystal composition.Whether single or double laser cladding, Ni60 A + 50WC-Co composite powder to be significantly higher than the hardness Ni60 A + 35WC-Ni composite powder, wherein the average hardness of the former is reached 992HV0. 2. Because of WC added, Ni60 A + wear 35WC-Ni composite powder Cladding than 45 steel substrate significantly enhanced, with minimal wear and only 8% weight loss of 45 steel. However replaced Ni60 A + wear Cladding did not continue to increase as the content of WC and significant upward trend after 50WC-Co composite powder. Wear mechanism of cladding layer includes adhesive wear and abrasive wear, adhesive wear.