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Liquid Phase Sintering of (Ti,Zr)C with WC-Co
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.ORCID iD: 0000-0003-1102-4342
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2017 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 10, no 1, p. 57-Article in journal, Editorial material (Refereed) Published
Abstract [en]

(Ti,Zr)C powder was sintered with WC-Co following an industrial process, including an isotherm at 1410 °C. A series of interrupted sintering trials was performed with the aim of studying the sintering behavior and the microstructural evolution during both solid-state and liquid-state sintering. Reference samples, using the same elemental compositions but with the starting components TiC and ZrC instead of (Ti,Zr)C, were also sintered. The microstructure was investigated using scanning electron microscopy and energy dispersive X-ray spectroscopy. It is found that the (Ti,Zr)C phase decomposes into Ti-rich and Zr-rich nano-scale lamellae before the liquid-state of the sintering initiates. The final microstructure consists of the binder and WC as well as two different γ phases, rich in either Ti (γ1) or Zr (γ2). The γ2 phase grains have a core-shell structure with a (Ti,Zr)C core following the full sintering cycle. The major differences observed in (Ti,Zr)C with respect to the reference samples after the full sintering cycle were the referred core-shell structure and the carbide grain sizes; additionally, the microstructural evolution during sintering differs. The grain size of carbides (WC, γ1, and γ2) is about 10% smaller in WC-(Ti,Zr)C-Co than WC-TiC-ZrC-Co. The shrinkage behavior and hardness of both composites are reported and discussed.

Place, publisher, year, edition, pages
2017. Vol. 10, no 1, p. 57-
Keywords [en]
cemented carbides, ternary cubic carbide; liquid-phase sintering, scanning electron microscopy, energy dispersive X-ray spectroscopy, dilatometer, differential scanning calorimetry
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-207823DOI: 10.3390/ma10010057ISI: 000394838800057Scopus ID: 2-s2.0-85011691103OAI: oai:DiVA.org:kth-207823DiVA, id: diva2:1098734
Note

QC 20170529

Available from: 2017-05-26 Created: 2017-05-26 Last updated: 2017-11-29Bibliographically approved
In thesis
1. Powder-metallurgical processing and phase separation in ternary transition metal carbides
Open this publication in new window or tab >>Powder-metallurgical processing and phase separation in ternary transition metal carbides
2017 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Ternary transition metal cubic carbides have high hardness and are potential carbides in cemented carbide and cermet tools, as well as hard coatings used to improve metal cutting performance. In the present work, (Ti,Zr)C, (V,Nb)C, and (V,Ta)C ternary cubic carbides were synthesized using traditional powder-metallurgical methods. The effect of synthesis temperature and starting materials on synthesis is investigated, and the microstructure evolution during aging is studied. (Ti,Zr)C was found to decompose into lamellae upon aging at the temperature range from 1150 to 1800 °C. A similar microstructure was observed in (V,Ta)C and (V,Nb)C- 0.5 wt% Fe. All of these structures were found to form through discontinuous precipitation.The grain misorientation distribution of (Ti,Zr)C aged at 1400 °C is investigated. It was found that decomposition tends to occur at high-angle grain boundaries above 25°. The hardness of as-synthesized (Ti,Zr)C powder was found to be 41±6 GPa. Fully decomposed (Ti,Zr)C particles were found to be slightly harder than the undecomposed counterpart. On the other hand, in (V,Nb)C-0.5 wt% Fe, the decomposed structure formed upon aging at 1200 °C was found to have a hardness of 26±2 GPa, which is basically the same as the unaged alloy.Furthermore, the sintering behavior of (Ti,Zr)C with WC-Co is investigated. There are two γ-phases in the final microstructure, one TiC-rich and one ZrC-rich. (Ti,Zr)C was found to decompose at an early stage of sintering, and the final grain size of WC and the two γ-phases was found to be 10% smaller than that in a reference WC-TiC-ZrC-Co composite.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2017. p. 43
National Category
Metallurgy and Metallic Materials
Research subject
Materials Science and Engineering
Identifiers
urn:nbn:se:kth:diva-207839 (URN)978-91-7729-439-9 (ISBN)
Public defence
2017-06-15, B2, Brinellvägen 23, Stockholm, 10:00 (English)
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Note

QC 20170529

Available from: 2017-05-29 Created: 2017-05-26 Last updated: 2017-05-30Bibliographically approved

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