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Role of Co Content on densification and Microstructure of WC–Co Cemented Carbides Prepared by Selective Laser Melting

引用

Acta Metallurgica Sinica(English Letters) 2021年第9期34卷 1245-1254页

作者： Jinyang Liu Jian Chen Li Zhou Bingyao Liu Yang Lu Shanghua Wu Xin Deng Zhongliang Lu Zhipeng Xie Wei Liu Jianye Liu Zhi Qu School of Electromechanical Engineering Guangdong University of TechnologyGuangzhou 510006China School of Electromechanical Engineering Guangdong Polytechnic Normal UniversityGuangzhou 510635China Master Group(Guangdong)Technology Research Co LtdYunfu 527400China State Key Laboratory for Manufacturing Systems Engineering Xi’an Jiaotong UniversityXi’an 710049China Guangdong Xi’an Jiaotong University Academy Foshan 528300China State Key Laboratory of New Ceramics and Fine Processing Tsinghua UniversityBeijing 100091China Guangdong Hanbang 3D Technology Co. LtdZhongshan 528427China Guangdong Fenghua Zhuoli Technology Co. LtdFoshan 528225China

WC–Co cemented carbides, well-known as the conventional tooling materials, have not been successfully produced by one step additive manufacturing processes such as selective laser melting(SLM) yet. The microstructure evolution as well as WC grain growth behavior has rarely been investigated in detail during SLM process. In this study, the WC–Co cemented carbides with different Co contents(12–32 wt%) were prepared by optimized SLM processes for comparative investigation of densification behavior, microstructure characterization and mechanical property. The increase in Co content in feedstock carbide granules can improve the densification behavior during SLM process. The SLM processed WC-12 Co shows larger average WC grain size and higher percentage of coarser WC grains as compared with both WC-20 Co and WC-32 Co. The microstructure characterization, combined with finite element simulation, shows the WC grain growth mechanisms include agglomeration and dissolution-deposition of WC during SLM process and agglomeration of WC is an important mechanism especially for WC–Co cemented carbides with Co content as low as 12 wt%. The comparison between horizontal(perpendicular to the SLM laser beam) and vertical(parallel to the SLM laser beam) cross sections of carbides shows that SLM process introduces a certain degree of microstructure and mechanical behavior anisotropy for WC-12 Co, WC-20 Co, and WC-32 Co.

关键词： Cemented carbides Selective laser melting Microstructure densifi cation behavior Finite element simulation

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