Pressure and temperature effects on the decomposition of arc evaporated Ti0.6Al0.4N coatings in continuous turning

Norrby, Niklas; Johansson, Mats; M’Saoubi, Rachid; Odén, Magnus

doi:10.1016/j.surfcoat.2012.08.068

Cited by 58 publications

(52 citation statements)

References 27 publications

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“…Al has a low melting point and can thus be expected to have high diffusivity at the temperatures reached at the tool-chip contact [29,30]. Similar to the observation made here, large amount of Al compared to the relative content in the work piece material have also been found in the adhered material during metal cutting elsewhere [27].…”

Section: Zone IIsupporting

confidence: 81%

“…Sever plastic deformation of the coating has occurred with sheared columns in the chip flow direction. This can be expected due to the high temperature and stress at this position of the tool [29,30], and similar behavior has also been reported for columnar Ti(C,N) coatings [31]. The coating thickness at this specific position varies between 1.5 and 2.0 µm, indicating that the coating has been worn locally.…”

Section: Zone Isupporting

confidence: 81%

“…Here, the surface is smooth while showing wear grooves parallel to the chip flow direction. The smaller amount of Al (thinner adhesion layer) in this regions is likely due to a combination of high temperature and high tangential forces [29] coupled with a higher material removal rate caused by the strong abrasive wear at this position. This is also the position of the tool where the coating is first worn through to expose the substrate.…”

Section: Zone IImentioning

confidence: 98%

“…We note that the hardness of the as-deposited c-ZrN, c-Zr0.65Al0.35N and w-Zr0.17Al0.83N coatings is similar, which does not reflect their cutting performance. The coating is effectively subjected to a high temperature exposure during a turning operation typically around 900 °C [29]. Therefore one would expect the hardness of the annealed coatings to better correlate with the cutting performance.…”

Section: Zone IImentioning

confidence: 99%

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Wear behavior of ZrAlN coated cutting tools during turning

Rogström

Johansson-Jöesaar

Landälv

et al. 2015

Surface and Coatings Technology

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In this study we explore the cutting performance of ZrAlN coatings. WC:Co cutting inserts coated by cathodic arc evaporated Zr1-xAlxN coatings with x between 0 and 0.83 were tested in a longitudinal turning operation. The progress of wear was studied by optical microscopy and the used inserts were studied by electron microscopy. The cutting performance was correlated to the coating composition and the best performance was found for the coating with highest Al-content consisting of a wurtzite ZrAlN phase which is assigned to its high thermal stability. Material from the work piece was observed to adhere to the inserts during turning and the amount of adhered material and its chemical composition is independent on the Al-content of the coating.

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Section: Zone IIsupporting

confidence: 81%

Section: Zone Isupporting

confidence: 81%

Section: Zone IImentioning

confidence: 98%

Section: Zone IImentioning

confidence: 99%

See 2 more Smart Citations

Wear behavior of ZrAlN coated cutting tools during turning

Rogström

Johansson-Jöesaar

Landälv

et al. 2015

Surface and Coatings Technology

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“…The hardness is also more pronounced due to the increased strain. In Ti 0.31 Cr 0.07 Al 0.62 N/TiN, the strain is the highest and an applied strain is known to promote the spinodal decomposition 42,43 and to suppress the formation h-AlN. 44,45 Fig .…”

Section: Resultsmentioning

confidence: 99%

Coherency strain engineered decomposition of unstable multilayer alloys for improved thermal stability

Forsén

Ghafoor

Odén

2013

Journal of Applied Physics

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A concept to improve hardness and thermal stability of unstable multilayer alloys is presented based on control of the coherency strain such that the driving force for decomposition is favorably altered. Cathodic arc evaporated cubic TiCrAlN/Ti 1Àx Cr x N multilayer coatings are used as demonstrators. Upon annealing, the coatings undergo spinodal decomposition into nanometer-sized coherent Ti-and Al-rich cubic domains which is affected by the coherency strain. In addition, the growth of the domains is restricted by the surrounding TiCrN layer compared to a non-layered TiCrAlN coating which together results in an improved thermal stability of the cubic structure. A significant hardness increase is seen during decomposition for the case with high coherency strain while a low coherency strain results in a hardness decrease for high annealing temperatures. The metal diffusion paths during the domain coarsening are affected by strain which in turn is controlled by the Cr-content (x) in the Ti 1Àx Cr x N layers. For x ¼ 0 the diffusion occurs both parallel and perpendicular to the growth direction but for x > ¼0.9 the diffusion occurs predominantly parallel to the growth direction. Altogether this study shows a structural tool to alter and fine-tune high temperature properties of multicomponent materials. V C 2013 AIP Publishing LLC. [http://dx

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