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Residual stresses and microstructure in fine grained cemented carbides doped with Cr and Ti
Department of Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden.
Scatterin AB, Drottning Kristinas väg 53, 114 28 Stockholm, Sweden, Scatterin AB, Drottning Kristinas väg 53.
Department of Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden.
Department of Physics, Chalmers University of Technology, 412 96 Göteborg, Sweden.
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2025 (English)In: International journal of refractory metals & hard materials, ISSN 0263-4368, Vol. 128, article id 107005Article, review/survey (Refereed) Published
Abstract [en]

Three fine grained WC-10 vol% Co cemented carbide materials were produced. One with 1 w% Cr addition, one with 0.025 w% Ti addition and one with both additions of 1 w% Cr and 0.025 w% Ti. It was found that doping of both Cr and Ti is advantageous for grain growth inhibition over just Cr- or Ti-doping. The impact of Cr and Ti as grain growth inhibitors on the residual stress state after sintering was investigated. The stress state in the centre of the composite, in WC and Co phase, was quantified by neutron diffraction. The addition of Ti and Cr significantly affects the residual stresses in WC. Notably, the co-doped material exhibits the lowest WC residual stresses despite rather similar WC average grain sizes and binder phase volume fractions compared to the Cr-doped material. This suggests that factors beyond grain size and Co-rich binder volume fraction can play a crucial role in residual stress development. Alterations in binder composition and resulting changes in binder stacking fault energy, thermal expansion coefficient and interface structures as well as changes of the solidification temperature are proposed to also effect the WC residual stresses, and further work is suggested to detail the underlying mechanisms.

Place, publisher, year, edition, pages
Elsevier BV , 2025. Vol. 128, article id 107005
Keywords [en]
Fine grained, Hard metal, Residual stress, WC-Co
National Category
Metallurgy and Metallic Materials Other Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-357889DOI: 10.1016/j.ijrmhm.2024.107005ISI: 001388452000001Scopus ID: 2-s2.0-85211440753OAI: oai:DiVA.org:kth-357889DiVA, id: diva2:1922596
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QC 20250114

Available from: 2024-12-19 Created: 2024-12-19 Last updated: 2025-01-20Bibliographically approved

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Hedström, Peter

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