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本文以 Stellite 合金的基础合金系 Co-Cr-C 三元合金为对象,考察研究了在激光重熔时合金中γ-Co 和 Cr_(7-x)Co_xC_3共生生长形态选择及其生长条件。研究表明,该合金系存在着一个朝碳化物成分方向倾斜的共晶生长区。在足够高的凝固生长速率时共晶成分合金的激光熔沟中出现初生γ-Co 枝晶,而含碳化物量高达55%的过共晶合金的熔沟内仍能观察到很宽的γ-Co 和 Cr_(7-x)Co_xC_3共生生长的共晶组织区域,实验还观察到 Co-Cr-C 合金在足够大的过冷度下发生的非晶转变。
In this paper, based on the Stellite alloy Co-Cr-C ternary alloy as the research object, the study of the laser remelting alloy γ-Co and Cr_ (7-x) Co_xC_3 morphology selection and growth conditions. Studies have shown that there is a eutectic growth zone tilted toward the carbide composition in the alloy. Primary γ-Co dendrites appear in the laser cladding of the eutectic composition alloy at a sufficiently high solidification growth rate, whereas very wide γ-Co dendrites can still be observed in the melt grooves of the hypereutectic alloys containing up to 55% Co and Cr_ (7-x) Co_xC_3 coexitated growth of eutectic microstructure, the experiment also observed that the Co-Cr-C alloy under sufficient degree of undercooling occurs amorphous transition.