Microstructures and Hardness of WC-Co and WC-HEA Cemented Carbides Additively Manufactured by the Multi-Beam Laser Directed Energy Deposition

Takahiro Kunimine; Wenheng Guo; Kaito Ebihara; Yorihiro Yamashita; Shintaro Yasui

doi:10.4028/p-jE6YU0

Paper Titles

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Effect of Oxygen on Phase Evolution in Al-Y₂O₃ Nanocomposites by Mechanical Alloying
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Microstructures and Properties of Diffusion Layer Formed at Laminated Interface of Alumina-Particle Dispersed Magnesium Laminated Compacts Fabricated by MM/SPS Method
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Mechanical and Thermal Properties of Harmonic Structure Composites with Ti-Ni Alloy and Copper
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Structure of Ta₂O₅containing Phosphate Invert Glasses Prepared by Liquid Phase Method
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In-Situ Observation and Quantitative Evaluation of Dendritic Silver Precipitates Growth inside Borosilicate Glass Substrate
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Investigation of Degradation Behavior of Adhesion between Sealing Resin and Copper by Aging Treatment
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Microstructures and Hardness of WC-Co and WC-HEA Cemented Carbides Additively Manufactured by the Multi-Beam Laser Directed Energy Deposition
p.65

HomeMaterials Science ForumMaterials Science Forum Vol. 1176Microstructures and Hardness of WC-Co and WC-HEA...

Microstructures and Hardness of WC-Co and WC-HEA Cemented Carbides Additively Manufactured by the Multi-Beam Laser Directed Energy Deposition

Abstract:

The WC-Co cemented carbide is one of the metal-matrix composites produced by sintering hard tungsten carbide (WC) with Co as metallic binder at high temperatures, and has excellent hardness and wear properties. In recent years, the high-entropy alloys (HEAs), which contain at least five elements with equiatomic or near-equiatomic ratio, have gained significant attention. The HEAs possess unique properties, which cannot be achieved by conventional alloying approaches based on only one alloying element, such as enhanced mechanical properties at high temperatures induced by severe lattice distortion effect and sluggish diffusion effect. In this study, HEAs were applied to alternative binders for the WC-Co cemented carbide as an attempt to seek enhanced mechanical properties. In the experiment, HEA powders such as the CrMnFeCoNi and CrFeCoNiMo HEAs were used as binder to fabricate WC-HEA cemented carbides by the multi-beam laser directed energy deposition (L-DED). WC-Co cemented carbide powder was also used for a comparative study. Through the comparative study, the role of elements in the initial binders are discussed. The multi-beam L-DED is one of the additive manufacturing (AM) processes. The WC-HEA cemented carbide powders were processed as single beads and square-shaped samples. Phase identification of the samples was performed by the X-ray diffraction (XRD). Microstructural observations were performed by a scanning electron microscope (SEM). The experimental results suggested the possibility for controlling hardness easily than the conventional processing routes by tailoring formed carbides through controlling laser processing conditions and alloying elements in initial binder materials.