炭化物生成元素のレーザ合金化による鋳鉄表面の硬化 [in Japanese] Surface Hardening of Cast Irons by Laser Alloying of Carbide Forming Element [in Japanese]
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Laser surface alloying of cast irons was carried out to obtain harder surface by carbide formation of alloyed element and graphite in the substrates. The alloying elements used were chromium or tungsten. To feed the alloying elements, a powder coated layer or electro plated layer was formed on the surface of the specimens prior to laser irradiation. Alloyed structures were obtained under the proper treatment conditions and X-ray diffraction tests showed that the modified structure with chromium powder layer contains chromium carbide (Cr<sub>7</sub>C<sub>3</sub>). Their microhardness was 950HV. The microstructures of tungsten treated speci-mens have primary dendrites and tungsten rich smooth matrix. X-ray diffraction also revealed the presence of W and Fe complex carbide and cementite. The microhardness of the tungsten alloyed structure, which is higher than that of melted-solidified structure without alloying element, was 1300HV.
- THE JOURNAL OF THE JAPAN FOUNDRYMEN'S SOCIETY
THE JOURNAL OF THE JAPAN FOUNDRYMEN'S SOCIETY 68(8), 657-661, 1996-08-25
Japan Foundry Engineering Society