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ICME guided modeling of surface gradient formation in cemented carbides
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: 0000-0001-8797-4585
2018 (English)In: International Journal of Refractory Metals and Hard Materials, ISSN 0263-4368, Vol. 72, p. 33-38Article in journal (Refereed) Published
Abstract [en]

Structural gradients are of great interest for state-of-the-art cemented carbides used in metal cutting applications. The gradient growth during sintering is controlled by the fundamental aspects of diffusion, thermodynamics and phase equilibria in systems with multiple components and phases. With the demand for binder alternatives to Co, there is a need for understanding the diffusion and thermodynamics in new materials systems. Materials development guided by ICME (Integrated Computational Materials Engineering) is a new approach that accelerates the design of tailor-made materials, assisting us to find and optimize prospective binder candidates using computational tools. The role of the thermodynamic descriptions will be briefly discussed but this work focuses on a better kinetic description. Models based on cemented carbide microstructures and fundamental understanding of kinetics will allow for a more general use of simulations of gradient formation. The diffusion of elements during sintering mainly occurs in the liquid binder phase, with the solid WC and gamma phases acting as an effective labyrinth, hindering diffusion. In this work, the liquid mobilities and the effective labyrinth factor is studied for traditional and alternative binders by combing ab initio molecular dynamics and diffusion couple experiments with CALPHAD modeling. 

Place, publisher, year, edition, pages
Elsevier Ltd , 2018. Vol. 72, p. 33-38
Keywords [en]
AIMD, DICTRA, ICME, Labyrinth factor, Liquid diffusion, Surface gradients, Bins, Carbide tools, Carbides, Diffusion, Liquids, Metal cutting, Molecular dynamics, Phase equilibria, Sintering, Thermodynamics, Binders
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-223113DOI: 10.1016/j.ijrmhm.2017.12.010ISI: 000427209100006Scopus ID: 2-s2.0-85038021984OAI: oai:DiVA.org:kth-223113DiVA, id: diva2:1186012
Note

Export Date: 13 February 2018; Article; CODEN: IJRMD; Correspondence Address: Walbrühl, M.; Department of Materials Science and Engineering, Royal Institute of TechnologySweden; email: walbruhl@kth.se; Funding details: KTH, Kungliga Tekniska Högskolan; Funding details: VINNOVA. QC 20180227

Available from: 2018-02-27 Created: 2018-02-27 Last updated: 2018-05-24Bibliographically approved

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Walbrühl, MartinÅgren, JohnLarsson, Henrik

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