Mechanical and microstructural characterization of WC-Co consolidated by binder jetting additive manufacturing

“…Tang et al [7] optimized the binder jetting process for inkjet printing Ti6Al4V parts with excellent properties. Mariani et al [8] demonstrated the feasibility of binder jetting technology to print WC-Co parts. This study revealed the importance of the characteristics of the initial powder and its influence on the mechanical properties of the printed parts.…”

Section: Of 16mentioning

confidence: 99%

Comparative Study on Microstructure and Corrosion Resistance of Al-Si Alloy Cast from Sand Mold and Binder Jetting Mold

Sastre

Cabezón

Abia

et al. 2021

Metals

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This investigation is focused on the corrosion evaluation of an as-cast Al-Si alloy, obtained by two different casting methods: traditional sand casting and three-printing casting, using a binder jetted mold. The experimental results are discussed in terms of chemical composition, microstructure, hardness, and corrosion behavior of two different casting parts. The microstructure and composition of the sample before and after the corrosion tests was analyzed using light microscopy (OM), scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (DRX). The corrosion of the two processed castings was analyzed using anodic polarization (PA) test and electrochemical impedance spectroscopy (EIS) in an aerated solution of 3.5% by weight NaCl, similar to the seawater environment. After the corrosion process, the samples were analyzed by inductively coupled plasma/optical emission spectrometry (ICP/OES); the composition was used to determine the chloride solution after immersion times. The sample processed by binder jetting mold showed higher corrosion resistance with nobler potentials, lower corrosion densities, higher polarization resistance, and more stable passive layers than the sample processed by sand casting. This improvement of corrosion resistance could be related to the presence of coarse silicon particles, which decrease of cathodic/anodic ratio and the number of micro-galvanic couples, and the lower amount of intermetallic β Al-Fe-Si phase observed in cast alloy solidified in binder jetting mold.

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“…The calculation of the angles between the sides of the cobalt binder region is based on the dot product. Choose three points of the contour x 1 , x 2 , x 3 For each of the three studied samples, we plotted a histogram of angles. The normalized angles distribution density is shown in Fig.…”

Section: Angles Distributionmentioning

confidence: 99%

Computer analysis of the cemented carbides’ microstructure

et al. 2021

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Cemented carbides have been known for about a hundred years and are now widely used in mining, civil and road construction, and mechanical engineering. Their improvement requires the development of novel technologies based on fundamentally new approaches. Here the method for microstructure analysis using computer processing with elements of machine learning and artificial intelligence is proposed. It has been applied to the analysis of micrographs obtained by the scanning electron microscopy of the WC-Co cemented carbides. The geometric parameters of the WC / Co interphase boundaries are extracted using mathematical methods for processing digital pictures. This method is applied to the micrographs of three samples with different WC mean grain sizes. It has been found that the distribution of the contact angles of WC / Co interphase boundaries has a pronounced bimodal structure, and the values of the peak angles are practically the same for the samples of the fine-, medium-, and coarse-grain cemented carbide grades. The distributions of the semiaxes for the isolated areas of the cobalt binder are also obtained. The probability of finding a particular value of long and short semiaxis decreases exponentially with increasing semiaxis length. Contrary to the contact angles, the exponents are different for samples with different WC grains sizes. The obtained results are discussed using the ideas of wetting of grain boundaries and faceting-roughening of interphase boundaries.

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Mechanical and microstructural characterization of WC-Co consolidated by binder jetting additive manufacturing

Cited by 41 publications

References 38 publications

Tailoring α-alumina powder morphology through spray drying for cold consolidation by binder jetting

Tailoring α-alumina powder morphology through spray drying for cold consolidation by binder jetting

Comparative Study on Microstructure and Corrosion Resistance of Al-Si Alloy Cast from Sand Mold and Binder Jetting Mold

Computer analysis of the cemented carbides’ microstructure

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