CORROSION-RESISTANT AND WEAR-RESISTANT BUILT-UP, METHOD FOR FORMING CORROSION-RESISTANT AND WEAR-RESISTANT BUILT-UP AND CORROSION-RESISTANT AND WEAR-RESISTANT VALVE

摘要

To reduce elution of Co from a built-up used in harsh environment such as a nuclear power plant by improving corrosion resistance of the built-up.SOLUTION: Corrosion-resistant and wear-resistant built-up 7 is formed by a laser additive manufacturing method along a surface of a base material 2 and is composed of a plurality of metal layers 1a, 1b, 1c, 1d using Co-based alloy as a material. The size (thickness) of the carbide deposited in each 1a, 1b, 1c, 1d eluted from the metal layer is the largest in the metal layer 1a on the base material 2 side, the metal layer 1b, 1c, 1d is smaller in order as away from the base material 2. Furthermore, the size of the carbide eutectic body deposited on at least the outermost metal layer 1d is controlled so as to be 10 μm or less by appropriately adjusting the intensity of the laser beam during layer formation by the laser additive manufacturing method.SELECTED DRAWING: Figure 2