Process development for the laser powder bed fusion of WC‐Ni Cermets using sintered‐agglomerated powder
Process development for the laser powder bed fusion of WC‐Ni Cermets using sintered‐agglomerated powder
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DOI：
10.1111/ijac.13988
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发表时间：
2021-12
影响因子：
2.1
通讯作者：
Edgar Mendoza Jimenez;B. Reeja‐Jayan;J. Beuth
中科院分区：
文献类型：
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作者：
Edgar Mendoza Jimenez;B. Reeja‐Jayan;J. Beuth
虽然陶瓷颗粒-金属基材料（即金属陶瓷）可以提供卓越的性能，但与制造金属合金相比，通过传统方法制造这些材料是困难的。本研究利用激光粉末床熔合（LPBF）工艺，利用新型球形、烧结-团聚复合粉末，增材制造致密碳化钨(WC) - 17 wt.%镍（Ni）复合材料样品。通过一系列由单头、多层和圆柱形构建组成的连续实验，发现了一系列产生高密度样品的处理参数。制备了相对密度为>99%的圆柱体，并对其微观结构、化学成分和硬度进行了表征。扫描电镜图像显示，Ni粘结剂和碳化物颗粒之间良好的润湿，没有任何相偏析，激光处理增加了碳化物的平均粒径。能量色散X射线和X射线衍射分析检测到激光加工后二次产物的痕迹。对于高能量密度处理的样品，检测到复杂的碳化物和碳团块相。打印样品的最大硬度达到60.38洛氏硬度C。本研究的成功构建为具有大的可用激光功率-激光速度加工窗口的致密WC - Ni部件的LPBF开辟了道路。
Although ceramic particle‐metal matrix materials (i.e., cermets) can offer superior performance, manufacturing these materials via conventional means is difficult compared to the manufacturing of metal alloys. This study leverages the laser powder bed fusion (LPBF) process to additively manufacture dense tungsten carbide (WC)‐17 wt.% nickel (Ni) composite specimens using novel spherical, sintered‐agglomerated composite powder. A range of processing parameters yielding high‐density specimens was discovered using a sequential series of experiments comprised of single bead, multi‐layer, and cylindrical builds. Cylinders with a relative density >99% were fabricated and characterized in terms of microstructure, chemical composition, and hardness. Scanning electron microscopy images show favorable wetting between the Ni binder and carbide particles without any phase segregation and laser processing increased the average carbide particle size. Energy dispersive X‐ray and X‐ray diffraction analyses detected traces of secondary products after laser processing. For samples processed at high energy densities, complex carbides and carbon agglomerate phases were detected. The maximum hardness of 60.38 Rockwell C is achieved in the printed samples. The successful builds in this study open the way for LPBF of dense WC‐Ni parts with a large workable laser power‐laser velocity processing window.