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Alternative Ni-based cemented carbide binder – Hardness characterization by nano-indentation and focused ion beam
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (Unit of Structures)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (Unit of Structures)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (Unit of Structures)
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering. (Unit of Structures)
2018 (English)In: International Journal of Refractory Metals and Hard Materials, ISSN 0263-4368, Vol. 73, p. 204-209Article in journal (Refereed) Published
Abstract [en]

The nano-hardness in the alternative 85Ni-15Fe binder phase of WC cemented carbide has been investigated. High-resolution scanning electron microscopy (SEM) imaging was used to measure the projected indentation area and a general pile-up correction, confirmed on selected indents, has been employed using atomic force microscopy (AFM). Focused ion-beam (FIB) cross-sections have been used to investigate the binder morphology below the indentations and the local binder hardness has been associated to the distance to the surrounding WC grains. Generally, decreasing distance to the WC grains leads to increased binder hardness. Furthermore, the nano-hardness for the cemented carbide binder has been corrected for the indentation size effect (ISE) to obtain the corresponding macroscopic hardness. A solid solution strengthening model for multicomponent bulk alloys was used to calculate the expected binder Vickers hardness considering the binder solubilities of W and C. Both the strengthening model and the ISE corrected hardness values, for larger binder regions, are in good agreement indicating that the intrinsic binder phase hardness is similar to that of a bulk metal alloy with similar composition.

Place, publisher, year, edition, pages
Elsevier, 2018. Vol. 73, p. 204-209
Keywords [en]
Alternative binder hardness, Binder shape, Cemented carbides, Constrained binder, Indentation size effect
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-227554DOI: 10.1016/j.ijrmhm.2018.02.017ISI: 000430028800027Scopus ID: 2-s2.0-85042350653OAI: oai:DiVA.org:kth-227554DiVA, id: diva2:1206223
Funder
VINNOVA
Note

QC 20180516

Available from: 2018-05-16 Created: 2018-05-16 Last updated: 2018-05-16Bibliographically approved

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Walbrühl, MartinLinder, DavidÅgren, John

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