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Investigation of Cemented Carbides with Alternative Binders after CVD Coating
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. (Applied Materials Science)
Royal Institute of Technologi.
Sandvik Coromant R&D.
Seco Tools AB R&D.
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2017 (English)In: International journal of refractory metals & hard materials, ISSN 0958-0611, E-ISSN 2213-3917, Vol. 62, p. 225-229Article in journal (Refereed) Published
Abstract [en]

Due to health concerns surrounding the use of cobalt as a binder for tungsten carbide in cemented carbides there is a drive to find an alternative binder. Although there are many publications on cemented carbides with alternative binders very few consider the possibility to coat these materials. In this work four different binder compositions containing iron-nickel or iron-nickel-cobalt and a pure cobalt reference are investigated with respect to coating ability. It is shown that it is possible to coat these cemented carbides with alternative binders through the same chemical vapor deposition process that is commonly used for cobalt based inserts and get similar coating structure. It is further shown that it can be done without the formation of η-phase and with comparable scratch test adhesion.

Place, publisher, year, edition, pages
2017. Vol. 62, p. 225-229
Keyword [en]
alternative binders, cemented carbide, CVD
National Category
Engineering and Technology Materials Engineering
Research subject
Engineering Science with specialization in Tribo Materials
Identifiers
URN: urn:nbn:se:uu:diva-310617DOI: 000390503200019OAI: oai:DiVA.org:uu-310617DiVA: diva2:1057299
Available from: 2016-12-16 Created: 2016-12-16 Last updated: 2017-11-29Bibliographically approved
In thesis
1. Alternative binder hardmetals for steel turning
Open this publication in new window or tab >>Alternative binder hardmetals for steel turning
2017 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The goal of this work is to understand how the wear and deformation mechanisms of hardmetalinserts change when the cobalt binder phase is replaced with a dierent metal or analloy. The focus is on inserts for steel turning. The work presented in this licentiate thesisconsists of the rst steps.Cobalt is the most common binder phase in hardmetal tools based on tungsten carbide asthe hard phase. Metallic cobalt powder, present during the manufacturing, has been associatedwith lung diseases and an increased risk for lung cancer if inhaled. Therefore it is importantto investigate alternative binders as one possible solution.This work studies binder phase alloys from the iron-nickel-cobalt system. These alloyscan be either austenitic, martensitic or a mixture of the two phases. By changing the binderphase composition to change the crystal structure it is possible to tailor the macroscopic mechanicalproperties of the material. It is also possible to tailor the composition in such a waythat the binder is transformation toughening, forming martensite as a response to mechanicaldeformation.The majority of inserts for steel turning are coated, and it is important to investigate if thehardmetals with alternative binder can be coated and if the coating adhesion is sucient forsteel turning.Four dierent alternative binder alloys and one reference with cobalt binder coated bychemical vapour deposition were investigated by scratch testing to determine the adhesion.The scratch test adhesion was sucient on all samples, but signicant variations in coatingadhesion were found.One alternative binder with 86wt%Ni and 14wt%Fe and a reference with cobalt binder manufacturedto mimic state of the art turning inserts were tested in steel turning. The alternativebinder grades had a lower resistance to plastic deformation and this was attributed to earlyaking of the coating due to a lower coating adhesion. Focused ion beam and scanning electronmicroscopy were used to study the deformation of the hard metal in the used cuttinginserts.

Place, publisher, year, edition, pages
Uppsala: Uppsala University, 2017. p. 54
Keyword
hardmetal, cemented carbide, alternative binder, steel turning, scratch testing, plastic deformation, EBSD, transformation toughening
National Category
Materials Engineering
Research subject
Engineering Science with specialization in Tribo Materials
Identifiers
urn:nbn:se:uu:diva-332451 (URN)
Presentation
2017-01-25, Å2001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, Uppsala, 10:15 (English)
Opponent
Supervisors
Available from: 2017-10-27 Created: 2017-10-27 Last updated: 2017-10-27Bibliographically approved

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Toller, LisaNorgren, Susanne

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