Topic
Chromium carbide
About: Chromium carbide is a research topic. Over the lifetime, 2314 publications have been published within this topic receiving 23658 citations.
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TL;DR: An empirical equation form, approximating the apparent dependence of the strength of brittle polycrystalline specimens on the combined effect of porosity and grain size, has been developed from concepts and data in the literature as discussed by the authors.
Abstract: An empirical equation form, approximating the apparent dependence of the strength of brittle polycrystalline specimens on the combined effect of porosity and grain size, has been developed from concepts and data in the literature. The form is shown to be applicable to data for thoria and chromium carbide specimens.
598 citations
TL;DR: In this paper, the authors compared the wear resistance of tungsten carbide and chromium carbide-based coatings with a three-body solid particle rubber wheel test rig using silica grits as the abrasive medium.
Abstract: Thermally sprayed tungsten carbide-based and chromium carbide-based coatings are being widely used for a variety of wear resistance applications. These coatings deposited by high velocity processes like high velocity oxy-fuel (HVOF) and detonation gun spray (DS) techniques are known to provide improved wear performance. In the present study, WC–10Co–4Cr and Cr3C2–20(NiCr) coatings are deposited by HVOF and pulsed DS processes, and low stress abrasion wear resistance of these coatings are compared. The abrasion tests were done using a three-body solid particle rubber wheel test rig using silica grits as the abrasive medium. The results show that the DS coating performs slightly better than the HVOF coating possibly due to the higher residual compressive stresses induced by the former process and WC-based coating has higher wear resistance in comparison to Cr3C2-based coating. Also, the thermally sprayed carbide-based coatings have excellent wear resistance with respect to the hard chrome coatings.
212 citations
TL;DR: In this paper, the ground state properties of chromium carbides (h-CrC, c-crC, Cr 3 C, Cr C 2, Cr 7 C 3, and Cr 23 C 6 ) are calculated by means of the first-principles pseudopotential method using the CASTEP code.
Abstract: In the present study, the ground state properties of chromium carbides (h-CrC, c-CrC, Cr 3 C, Cr 3 C 2 , Cr 7 C 3 , and Cr 23 C 6 ) are calculated by means of the first-principles pseudopotential method using the CASTEP code. The equilibrium crystal structures and thermodynamical stability of the six chromium carbide phases are discussed. Moreover, the chemical bonding in these carbides are interpreted by calculating the density of states, electron density distribution and Mulliken analysis; all the six chromium carbides have a combination of metallic, ionic and covalent bonding characteristic, while Cr 7 C 3 exhibits the strongest metallic character. The elastic constants, elastic anisotropies and theoretical hardness of the carbides are also presented, which are important parameters for the structural materials and surface coatings.
210 citations
TL;DR: In this article, various types of MMC coatings were prepared by laser coating methods, which consisted of vanadium, tungsten, titanium and chromium carbide hard phases mixed with metallic tool steel M2, Stellite 21, NiCrBSi-alloy and Inconel 625.
Abstract: Laser coating (laser cladding) is a useful method to produce metal matrix composite (MMC) coatings. The selection of the metallic matrix can be done on the base of the intended application and environment, whereas the additional wear resistance improvement is provided by mixing various carbides with the metallic matrix. In the present work, various types of MMC coatings were prepared by laser coating methods. The coatings consisted of vanadium, tungsten, titanium and chromium carbide hard phases mixed with metallic tool steel M2, Stellite 21, NiCrBSi-alloy and Inconel 625. Different levels of carbide contents were used. The abrasion resistance of the MMC coatings has been tested using a rubber-wheel abrasion apparatus. The wear surfaces were examined and the microstructures of MMC coatings were analysed in order to determine microstructures and carbide dissolution. The best abrasion results were achieved by the correct choice of carbide for each matrix material.
194 citations
TL;DR: In this paper, the HP steels modified with Nb and Nb-plus-Ti, produced in the form of centrifugally cast tubes, were characterized by means of light optical microscopy, scanning electron microscopy (SEM) with secondary and backscattered electron imaging, and transmission electron microscope with energy-dispersive spectroscopy (EDS) and selected area diffraction.
Abstract: HP steels modified with Nb and Nb-plus-Ti, produced in the form of centrifugally cast tubes, were characterized by means of light optical microscopy, scanning electron microscopy (SEM) with secondary and backscattered electron imaging, and transmission electron microscopy (TEM) with energy-dispersive spectroscopy (EDS) and selected area diffraction A complete description of the phases present in the as-cast, welded, and aged condition was made as a function of the modifying elements The chromium carbide stoichiometry, secondary precipitation, NbC instability at elevated temperatures, the G-phase transformation, and the effect of Ti on this reaction are discussed It is indicated that partial transformation of G-phase in the alloy modified with Ti is one of the explanations for the superior creep properties observed in this material
189 citations