炭素鋼へのWCを分散したハステロイのレーザ肉盛特性 Laser Beam Cladding Characteristics of WC Dispersed Hastelloy on Carbon Steel
CO<sub>2</sub> laser beam was applied to the cladding of WC dispersed hastelloy on carbon steel by a preplaced powder method. The hardness and microstructure of the clad layer were investigated by changing the power of laser, number of clad layers and overlapped width of the laser beam. The average hardness of matrix in the clad layer was 400 to 420HV 0. 1 under the following conditions : laser power of 2500W to 3100W, cladding speed of 400mm/min, defocusing distance of 30mm, oscillation width of 7mm and argon gas shielding. The microstructure of the clad layer was observed to transform into fine dendrites with secondary dendrite arm spacing of 2<i>μ</i>m and fine eutectic structure because of rapid solidification, and tungsten carbide particles were dispersed in the matrix. A heat affected zone was produced near the boundary of the clad layer on the surface of the carbon steel and martensitic structure was observed. The clad layer was then heat treated again with CO<sub>2</sub> laser beam, but the hardness of the clad layer did not change. EPMA line analysis indicated that an alloyed layer with a thickness of 20<i>μ</i>m exists between the clad layer and the heat affected zone of the carbon steel. These results suggest that CO<sub>2</sub> laser beam cladding of WC dispersed hastelloy is a useful surface treatment process.
- 鋳造工学 = Journal of Japan Foundry Engineering Society
鋳造工学 = Journal of Japan Foundry Engineering Society 75(8), 562-567, 2003-08-25
Japan Foundry Engineering Society