Schmid factor analysis for chip flow induced plastic deformation of textured cubic carbonitride coatings
Journal article, 2022

In high-speed metal machining, cutting tools in the form of cemented carbide inserts coated with thin wear-resistant coatings are commonly used. These coatings are often made of metal carbonitrides with cubic rock salt crystal structure and different growth textures. However, the influence of the crystallographic texture of the coatings on their wear by plastic deformation due to the chip flow during machining needs to be revealed further. In this work, in order to analyse the ability of polycrystalline fibre-textured coatings with a rock salt structure to undergo plastic deformation, a method was developed for calculating Schmid factors of such textured coatings as a function of the loading angle of an external force. The Schmid factors were calculated for coatings with 100 and 211 growth textures, and {100} <110>, {110}<110> and {111}<110> as possible slip systems. For the {111}<110> slip systems, the Schmid factors are not much influenced by the force angle and coating texture, which is contrary to the {100}<110> and {110}<110> slip systems. The simulations were compared to wear on the rake face of two textured Ti(C,N) coatings after short longitudinal turning tests. The variation of the degree of plastic deformation of Ti(C,N) coatings with growth texture and external force angle indicates that the dominant activated slip systems are {110}<110> using the machining conditions applied in this work.

Schmid factors

Ti(C,N)

Deformation mechanism

CVD

Hard Coatings

Author

Ren Qiu

Chalmers, Physics, Microstructure Physics

Siamak Shoja

Chalmers, Physics, Microstructure Physics

Sandvik

L. von Fieandt

Sandvik

Jan Engqvist

Sandvik

Olof Bäcke

Chalmers, Physics, Microstructure Physics

Hans-Olof Andrén

Chalmers, Physics, Microstructure Physics

Mats Halvarsson

Chalmers, Physics, Microstructure Physics

International Journal of Refractory Metals and Hard Materials

02634368 (ISSN) 22133917 (eISSN)

Vol. 108 105932

CVD 2.0 - En ny generation av hårda beläggningar

Swedish Foundation for Strategic Research (SSF) (RMA15-0048), 2016-05-01 -- 2021-06-30.

Subject Categories

Other Mechanical Engineering

Materials Chemistry

Composite Science and Engineering

Infrastructure

Chalmers Materials Analysis Laboratory

Areas of Advance

Materials Science

DOI

10.1016/j.ijrmhm.2022.105932

More information

Latest update

1/3/2024 9