Effect of laser power and heat treatment process on microstructure and property of multi-pass Ni based alloy laser cladding coating

Chuanqi Wang; Hongxi Liu; Xiaowei Zhang; Weihua Zeng; Yehua Jiang; Rong Zhou

doi:10.1117/12.870735

16 November 2010 Effect of laser power and heat treatment process on microstructure and property of multi-pass Ni based alloy laser cladding coating

Chuanqi Wang, Hongxi Liu, Xiaowei Zhang, Weihua Zeng, Yehua Jiang, Rong Zhou

Author Affiliations +

Proceedings Volume 7843, High-Power Lasers and Applications V; 78430Y (2010) https://doi.org/10.1117/12.870735
Event: Photonics Asia 2010, 2010, Beijing, China

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.

Citation Download Citation

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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