Toughening of Inconel 625 alloy reinforced by WCp fabricated by electron beam melting
首发时间:2017-05-11
Abstract:With the elevated addition of carbide reinforcements, the ductility of Ni-Based metal matrix composited dropped drastically. Samples fabricated by electron beam melt system, using blend of Inconel 625 and WC powders as raw materials are investigated. In order to find a method to maximize the toughness of such MMCs, several parameters are independently changed during the fabrication. As results, MMCs' ductilities are sensible to parameters such as the scan speed of electron beam. The variance of impact toughness can be up to 50% for MMCs with 30 wt% WC concentration. The sensitivity to parameters drops when the addtion of WC reinforcement increases. The scan speed largely determines the heat input and thus influences the form and the size of melt pool. It has subsequently impacts on the morphology and the types of secondary carbides, degree of dissolution of WC particles, and grain size and growth direction. All factors mentioned above interact, and determine the toughness of sample. The effect of Line offset is also inverstigated. With experimental results, a constructive advice based on an experimental optimized energy density for parameter setting of practical components with large scale was proposed.
keywords: Composites EBM Inconel 625 MMC
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电子束选区熔化WC颗粒增强Inconel 625复合材料的强韧化
摘要:镍基金属基复合材料中添加的增强颗粒会使复合材料的韧性大大下降。本研究对电子束选区熔化制备的WC颗粒增强Inconel 625复合材料进行了研究。为了增强复合材料的韧性并探究其机理,对电子束选区熔化的一些参数进行了独立研究。复合材料的冲击韧性对扫描速度等参数敏感。敏感度随着WC添加量的增多而下降。30 wt% WC添加量的复合材料韧性差距高大50%。扫描速度很大程度上决定了热量输入的大小,进而控制者熔池的大小和形貌,最终影响了材料的围观形貌,如WC颗粒的溶解带范围和集体中二次析出相的形貌。扫描线重叠度也对其韧性有影响。二次析出相,基体与增强相的结合面还有基体的结构共同作用影响着复合材料的韧性。本研究针对实验结果给出最优参数,并给出了最适合的能量密度。
关键词: 复合材料 电子束选区熔化 因克奈尔625; 金属基复合材料
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No.4729869119472614****
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电子束选区熔化WC颗粒增强Inconel 625复合材料的强韧化
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