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Life time of cemented carbide inserts with Ni-Fe binder in steel turning
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.ORCID iD: 0000-0002-3955-5746
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences. Sandvik Coromant R&D, Stockholm, Sweden..
2017 (English)In: Wear, ISSN 0043-1648, E-ISSN 1873-2577, Vol. 376, 1822-1829 p.Article in journal (Refereed) Published
Abstract [en]

Health concerns associated with cobalt powder are a strong motivator for conducting research on alternative binders for cemented carbides. It has previously been shown possible to make cemented carbides with alternative binders, which offer good hardness and toughness. However, it is not fully known if these cemented carbides can be successfully used as metal cutting tools. In this study we have tested turning inserts from cemented carbide with a nickel-iron binder and compared these with cobalt based reference inserts in dry face turning of steel in a pairwise comparison. To facilitate relevant comparisons, both the alternative binder and the reference cemented carbide are gradient sintered and coated in the same way as commercial turning grades. It is found that the life time in this dry face turning test is only approximately 15% shorter with the nickel-iron binder than with the cobalt reference, which motivates further studies with this alternative binder. Flaking of the coating and thus less coating adhesion was identified as one reason for the shorter life time.

Place, publisher, year, edition, pages
2017. Vol. 376, 1822-1829 p.
Keyword [en]
Cutting tools, Cemented carbide, Alternative binder, Face turning
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-329133DOI: 10.1016/j.wear.2017.02.018ISI: 000403902000097OAI: oai:DiVA.org:uu-329133DiVA: diva2:1148266
Funder
VINNOVA
Available from: 2017-10-10 Created: 2017-10-10 Last updated: 2017-10-27Bibliographically 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. 54 p.
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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