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Grinding-induced metallurgical alterations in the binder phase of WC-Co cemented carbides
Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, Faculty of Science & Engineering. University of Politecn Cataluna, Spain.
University of Politecn Cataluna, Spain; University of Politecn Cataluna, Spain.
SECO Tools AB, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, Faculty of Science & Engineering.ORCID iD: 0000-0002-2286-5588
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2017 (English)In: Materials Characterization, ISSN 1044-5803, E-ISSN 1873-4189, Vol. 134, p. 302-310Article in journal (Refereed) Published
Abstract [en]

The metallic binder phase dictates the toughening behavior of WC-Co cemented carbides (hardmetals), even though it occupies a relative small fraction of the composite. Studies on deformation and phase transformation of the binder constituent are scarce. Grinding represents a key manufacturing step in machining of hardmetal tools, and is well-recognized to induce surface integrity alterations. In this work, metallurgical alterations of the binder phase in ground WC-Co cemented carbides have been assessed by a combination of electron back scattered diffraction and transmission electron microscopy techniques. The Co-base binder experiences a martensitic phase transformation from fcc to hcp crystal structure, predominantly in the first 5 mu m below the surface. The hcp fraction decreases gradually along a depth of 10 mu m. Surface Co displays severe plastic deformation under the highest strain, resulting in formation of nanocrystalline grains in the first micrometer below the surface. Microstructural refinement within the binder phase is observed even at greater depth. Stacking faults were detected in most of the refined grains. The metallurgical alterations of the binder phase modify the local stress distribution during grinding, which affects the discerned subsurface microcracking. The resulting residual stress profile is the sum of multiple subsurface changes, such as phase transformation, severe plastic deformation and grain refinement, where it is discerned that the depth profile of the transformed hcp-Co fraction coincides with the grinding-induced residual stress profile.

Place, publisher, year, edition, pages
ELSEVIER SCIENCE INC , 2017. Vol. 134, p. 302-310
Keyword [en]
Grinding; WC-Co cemented carbides; Metallic binder; Deformation; Phase transformation
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:liu:diva-144572DOI: 10.1016/j.matchar.2017.11.004ISI: 000419416400035OAI: oai:DiVA.org:liu-144572DiVA: diva2:1178270
Note

Funding Agencies|Spanish MINECO/FEDER [MAT2015-70780-C4-3-P]; Erasmus Mundus joint European Doctoral Programme DocMASE

Available from: 2018-01-29 Created: 2018-01-29 Last updated: 2018-01-29

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Yang, JieOdén, MagnusJohansson, Mats
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Biomolecular and Organic ElectronicsFaculty of Science & EngineeringNanostructured Materials
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