liu.seSearch for publications in DiVA
Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Improved metal cutting performance with biasmodulated textured Ti0.50Al0.50N multilayers
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology. Seco Tools AB, Fagersta, Sweden.
Linköping University, Department of Physics, Chemistry and Biology, Nanostructured Materials. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-2286-5588
2014 (English)In: Surface & Coatings Technology, ISSN 0257-8972, E-ISSN 1879-3347, Vol. 257, 102-107 p.Article in journal (Refereed) Published
Abstract [en]

In this work we present the cutting performance of Ti0.50Al0.50N coatings which have been deposited with both a fixed and an alternating bias of -35 V and -70 V together with a Ti0.33Al0.67N reference coating grown at -35 V. The bias-modulated coatings were grown with different bias-layer periods, from 200 to 1200 nm. For the layers deposited with a fixed bias, a transition from a (100) to a (111) preferred orientation was observed with the change in bias from -35 V to -70 V. The coatings grown with an alternating bias, however, showed a (111) preferred orientation with an intensity that slightly depends on bias-layer period. Metal cutting performance in terms of crater and flank wear resistance show an improvement for all bias-layered coatings. This is attributed to a (111) oriented refined grain structure in combination with low residual stresses in the coating.

Place, publisher, year, edition, pages
Elsevier, 2014. Vol. 257, 102-107 p.
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:liu:diva-106505DOI: 10.1016/j.surfcoat.2014.05.045ISI: 000344423100013OAI: oai:DiVA.org:liu-106505DiVA: diva2:716464
Funder
VINNOVA
Available from: 2014-05-09 Created: 2014-05-09 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Microstructural evolution of TiAlN hard coatings at elevated pressures and temperatures
Open this publication in new window or tab >>Microstructural evolution of TiAlN hard coatings at elevated pressures and temperatures
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A typical hard coating on metal cutting inserts used in for example turning, milling or drilling operations is TiAlN. At elevated temperatures, TiAlN exhibits a well characterized spinodal decomposition into coherent cubic TiN and AlN rich domains, which is followed by a transformation from cubic to hexagonal AlN. Using in-situ synchrotron x-ray radiation, the kinetics of the second transformation was investigated in this thesis and the strong temperature dependence on the transformation rate indicated a diffusion based nucleation and growth mechanism. The results gave additional information regarding activation energy of the transformation and the critical wavelength of the cubic domains at the onset of hexagonal AlN. After nucleation and growth, the hexagonal domains showed a striking resemblance with the preexisting cubic AlN microstructure.

During metal cutting, the tool protecting coating is subjected to temperatures of ~900 ºC and pressure levels in the GPa range. The results in this thesis have shown a twofold effect of the pressure on the decomposition steps. Firstly, the spinodal decomposition was promoted by the applied pressure during metal cutting which was shown by comparisons with annealed samples at similar temperatures. Secondly, the detrimental transformation from cubic to hexagonal AlN was shown to be suppressed at elevated hydrostatic pressures. A theoretical pressure/temperature phase diagram, validated with experimental results, also showed suppression of hexagonal AlN by an increased temperature at elevated pressures.

The spinodal decomposition during annealing and metal cutting was in this work also shown to be strongly affected by the elastic anisotropy of TiAlN, where the phase separation was aligned along the elastically softer <100> directions in the crystal. The presence of the anisotropic microstructure enhanced the mechanical properties compared to the isotropic case, mainly due to a shorter distance between the c-AlN and c-TiN domains in the anisotropic case. Further improvement of the metal cutting behavior was realized by depositing individual layers with an alternating bias. The individual bias layers exhibited microstructural differences with different residual stress states. The results of the metal cutting tests showed an enhanced wear resistance in terms of both crater and flank wear compared to coatings deposited with a fixed bias.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2014. 75 p.
Series
Linköping Studies in Science and Technology. Dissertations, ISSN 0345-7524 ; 1583
National Category
Materials Engineering
Identifiers
urn:nbn:se:liu:diva-106507 (URN)10.3384/diss.diva-106507 (DOI)978-91-7519-372-4 (ISBN)
Public defence
2014-06-11, Planck, Fysikhuset, Campus Valla, Linköpings universitet, Linköping, 10:15 (English)
Opponent
Supervisors
Available from: 2014-05-09 Created: 2014-05-09 Last updated: 2014-05-09Bibliographically approved

Open Access in DiVA

fulltext(898 kB)232 downloads
File information
File name FULLTEXT01.pdfFile size 898 kBChecksum SHA-512
5ffc82464a024be41e1b71ba63b174bb7647f3f868606f264e457d5ec790b794ca8a6d2399274b1b3abcc7b880638e0ed5ca579bca43e25c4092a0a93abf2b38
Type fulltextMimetype application/pdf

Other links

Publisher's full text

Authority records BETA

Norrby, NiklasJohansson Jöesaar, Mats P.Odén, Magnus

Search in DiVA

By author/editor
Norrby, NiklasJohansson Jöesaar, Mats P.Odén, Magnus
By organisation
Nanostructured MaterialsThe Institute of Technology
In the same journal
Surface & Coatings Technology
Materials Engineering

Search outside of DiVA

GoogleGoogle Scholar
Total: 232 downloads
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 152 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • oxford
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf