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SCIE SCOPUS
CO2 레이저에 의한 탄소공구강의 TiC 표면합금층 형성과 Co 첨가의 영향
TiC - Surface Alloying Treatment of Carbon Tool Steel by CO2 Laser and the Effect of Co addition
김도훈(T . H . Kim), 서광하(K . H . Suh)
UCI I410-ECN-0102-2008-580-001863951

In order to improve wear-resistance of carbon tool steel, a study of TiC-surface alloying was carried out by irradiation of CO₂laser. Mixtures of TiC and Co powders were applied directly on specimens by coating powder slurry suspended in alchohol to the thickness of 70㎛. Surface alloyed layers were obtained by single and overlapping laser tracks. Microstructural observation, X-ray diffraction analysis, microhardness test and wear test were carried out on earth specimen. Strengthening mechanisms of TiC-surface alloyed hayer were martensitic transformation, dispersion of TiC particles and grain refinements in alloyed layer. Although the alloyed layer was martensitic structure, lots of undissolved Fe₃C were present due to rapid heating and cooling. Mixtures of TiC+ 5% Co resulted in an increase of hardness by elevating Ms temperature, but further increase of Co reduced the hardness by stabilization of austenite. Even if Fe₃C was decarburized in TiC-surface alloyed layer when it was annealed at high temperature, TiC was not decarburized. Thus a little higher wear-resistance and heat-resistance are expected compared with carbon tool steel when it is used in high temperature.

[자료제공 : 네이버학술정보]
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