Ni基合金粉末を用いた機械部品へのプラズマ肉盛及び高効率レーザ肉盛

概要

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The SUS316L stainless steel is widely used as the machinery parts for chemical plant and power plant. In order to improve the wear- and corrosion-resistance quality of parts, usually, the plasma process has been adopted to clad Co-based and Ni-based alloys powder on parts surface of SUS316L stainless steel. In the present work, the CO_2 laser (2.4kW-CW) cladding of low residual stress and small distortion, and plasma cladding were investigated to deposit WELPC-6 Nickel alloy powder on the cylindrical prod for power plant. The smooth clad bead was obtained by CO_2 laser cladding. The phases of clad layer were investigated by an optical microscope, scanning electron microscopy (SEM), X-ray diffractometer (XRD), electron probe microanalysis (EPMA), and energy-dispersion-spectrometer (EDS). The microstructures of clad layers belong to a hypereutectic structure. Primary phases consist of Cr_7C_3 and CrB. The eutectic structure consists of γ-(Ni, Fe)+Cr_<23>C_6 or γ-(Ni, Fe)+Cr_2B. Comparing with the plasma process, the fine microstructures, low dilutions, and high Vickers hardness were obtained by CO_2 laser cladding.
社団法人溶接学会の論文
2005-08-05