Laser Beam Cladding Characteristics of Nickel Alloy on Alloy Tool Steel

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  • Kataoka Yoshihiro
    Department of Precision Mechanical System Engineering, Polytechnic University

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  • 合金工具鋼へのニッケル合金のレーザ肉盛特性
  • ゴウキン コウグ コウ エ ノ ニッケル ゴウキン ノ レーザ ニクモリ トクセイ

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CO2 laser beam was applied to the cladding of nickel alloy on alloy tool steel by a preplaced powder method. The hardness and microstructure of the clad layer were investigated by changing the power of laser and number of clad layers. The average hardness of the clad layer was 240 to 260 HV0.1 under the following conditions: laser power of 2200W to 3100W, cladding speed of 400mm/min, defocusing distance of 30mm. oscillation width of 7mm and argon gas shielding. The microstructure of clad layer showed fine dendrites of which secondary dendrite arm spacing was 5μm because of their rapid solidification. A heat affected zone was produced near the clad layer on the surface of the alloy tool steel and their martensitic structure was observed. The clad layer was then heat treated again with the CO2 laser beam, but the hardness of the clad layer remained unchanged. EPMA line analysis indicated that an alloyed layer with 30μm in thickness exists between the clad layer and substrated base metal. These results suggest that CO2 laser beam cladding of nickel alloy is a useful surface treatment process for alloy tool steel.

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