Laser powder bed fusion of cemented carbides by developing a new type of Co coated WC composite powder

材料科学 复合数 微观结构 三元运算 复合材料 冶金 相对密度 碳化物 粒度 激光器 物理 计算机科学 光学 程序设计语言
作者
Lei Zhang,Chaoquan Hu,Yafeng Yang,R.D.K. Misra,Katsuyoshi Kondoh,Yanan Lu
出处
期刊:Additive manufacturing [Elsevier BV]
卷期号:55: 102820-102820 被引量:17
标识
DOI:10.1016/j.addma.2022.102820
摘要

The study addresses the issue of the absence of high-quality WC-Co composite powder for laser powder bed fusion and assessing the printability of the new powder in terms of densification, microstructure and mechanical properties. The fluidized bed chemical vapor deposition (FBCVD) combined with electroless plating process was adopted to make core-shell structured WC-Co composite powder. The excellent uniformity of Co and good powder flowability were achieved by tuning the size and distribution of Co catalyst during FBCVD and regulating their relationship to the subsequent electroless plating behavior. The newly developed composite powder exhibited excellent printability. The densification mechanism was largely dependent on the laser energy density. The liquid formed by the melting of Co was responsible for the densification at low laser energy density, while the Co-W-C ternary liquid resulted from the dissolution of WC into Co melt dominated the densification at high laser energy density. Microstructurally, the morphology and size of WC grains were insignificantly changed because of its non-participation with liquid formation at low laser energy density. The rectangular/triangular WC grain morphology similar to the traditional sintered was formed at high laser energy density because of the precipitation of WC from the Co-W-C ternary liquid. Affected by the different liquid formation processes, increasing laser energy density increased the relative density, promoted the W2C phase formation and decreased WC grain size, which remarkably improved the hardness and tribological properties of the printed cemented carbide.
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