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16 November 2010 Effect of laser power and heat treatment process on microstructure and property of multi-pass Ni based alloy laser cladding coating
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Abstract
Ni60CuMoW alloy power was clad on 45 steel surfaces using a synchronization powder feeding method by 6kW transverse-flow CO2 laser apparatus. The effect of laser power and heat treatment process on corrosion resistance of the cladding layer was investigated. The microstructure and mechanical property were analyzed by X-ray diffractometer (XRD), scanning electron microscope (SEM), energy depressive X-ray spectroscopy (EDX), microhardness meter and PS-268A electrochemical test equipment. The results show that the cladding layer is mainly composed of γ (Ni, Fe), solid solution (Ni, Cu), compounds Ni31Si12, Cr5B3, CrB, Ni3B, FeNi3, M23C6 (Cr23C6 or (Fe,Ni) 23C6) phase and a small amount of WC or W2C. With the increase of laser power, corrosion resistance and microhardness has been greatly improved. Compared with the untreated substrate, the maximum self-corrosion potential of single-pass layer at laser power 3.2 kW in 3.5% NaCl saturated solution increases by 136.2mV, and the lowest corrosion current density decreases by 2 orders of magnitude. The mean microhardness of treated samples raises by 5.17, 4.90 and 4.89 times, respectively. The corrosion potential of multi-pass layer increases by 437.6mV and corrosion current density decreases by one order of magnitude than that of single-pass layer sample. After temper 600°C heat treatment, the primary dendrite and block (or needle) eutectic in cladding coatings become more uniform, the maximum self-corrosion potential increases by 45.5mV and corrosion current density also decreases obviously.
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Chuanqi Wang, Hongxi Liu, Xiaowei Zhang, Weihua Zeng, Yehua Jiang, and Rong Zhou "Effect of laser power and heat treatment process on microstructure and property of multi-pass Ni based alloy laser cladding coating", Proc. SPIE 7843, High-Power Lasers and Applications V, 78430Y (16 November 2010); https://doi.org/10.1117/12.870735
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