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Experimental study of carbides in the Ti-Cr-C system
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. Sandvik Coromant R&D, S-12679 Stockholm, Sweden..
Sandvik Coromant R&D, S-12679 Stockholm, Sweden..
Sandvik Coromant R&D, S-12679 Stockholm, Sweden.;Uppsala Univ, Angstrom Tribomat Grp, Appl Mat Sci, S-75121 Uppsala, Sweden..
Sandvik Coromant R&D, S-12679 Stockholm, Sweden..
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2019 (English)In: Journal of Materials Science, ISSN 0022-2461, E-ISSN 1573-4803, Vol. 54, no 19, p. 12358-12370Article in journal (Refereed) Published
Abstract [en]

The Ti-Cr-C system has been studied by producing samples within the MC-M3C2-M7C3 (M=Ti, Cr) and MC-M3C2-graphite equilibria. The main purpose was to determine the solubility of Cr in MC; however, the solubility of Ti in M3C2 and M7C3 was also of interest, as well as the C content in MC. Heat treatments have been performed at 1673 and 1773 K for 300 h. Thereafter, the phase compositions have been measured with energy-dispersive X-ray spectroscopy (EDS) and wavelength-dispersive X-ray spectroscopy (WDS). X-ray diffraction (XRD), in combination with Rietveld refinement, has been used to determine the lattice parameter for MC. Density functional theory (DFT) calculations were performed to estimate the lattice parameter for MC as a function of composition, and the Rietveld refined lattice parameters for MC have then been recalculated to compositions in order to verify the EDS measurements. The results show that the EDS and XRD measurements give equal results. One conclusion is that, with the current conditions, 300 h is a sufficient heat treatment time in order to reach thermodynamic equilibrium. The other main conclusion is that the solubility of Cr in MC, in general, was overestimated by previous studies due to too short heat treatment times, but also that the solubility is very temperature dependent, especially for the MC-M3C2-graphite equilibrium. This clear temperature dependence was not taken into account in the existing thermodynamic description found in the literature.

Place, publisher, year, edition, pages
Springer, 2019. Vol. 54, no 19, p. 12358-12370
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-255541DOI: 10.1007/s10853-019-03810-3ISI: 000475764300007Scopus ID: 2-s2.0-85068859505OAI: oai:DiVA.org:kth-255541DiVA, id: diva2:1340404
Note

QC 20190805

Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2019-08-05Bibliographically approved

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