닫기
3.12.34.211
3.12.34.211
close menu
SCIE SCOPUS
레이저에 의한 탄소공구강의 텅스텐표면 합금화와 코발트 첨가의 영향
Tungsten Surface alloying of Carbon Tool Steel by CO2 Laser and the Effect of Cobalt Addition
김도훈(T . H . Kim), 석명근(M . G . Suk)
UCI I410-ECN-0102-2008-580-001852825

In order to improve the wear-resistance and heat-resistance of carbon tool steel, a study of tungsten surface alloying by the irradiation of CO₂laser was carried out. Mixtures of tungsten and cobalt powders were applied directly on specimens by coating a powder slurry suspended in a alchohol to the thickness of 70㎛. Surface alloyed layers were obtained by single and overlapping laser tracks at 900 W. Microhardness test, microstructural observation, X-ray diffraction analysis and EPMA test were carried out on each specimen. Well developed tungsten surface-alloyed layers were produced on tool steel. The thickness of these layers was about 250㎛ and the hardness was 1000 Hv Tungsten was distributed homogeneously throughout the alloyed layer by well-intermixing of components, and its concentration was about 10%. The microstructure of this layer consisted of martensite in equiaxed grains. Mixtures of W +5% Ce increased the depth and width of the lasermelted zone. A futher increase of Co in mixture decreased the depth of allayed layer. When a specimen was annealed at 1100℃ for 5 hours, a large amount of tungsten carbides (WC) precipitated in the alloyed layer When a large surface is to be alloyed by overlapping laser tracks, the degree of overlapping should be at least within a half of that of single laser pass to obtain homogeneous alloyed layer.

[자료제공 : 네이버학술정보]
×