Ex Situ Residual Stress Analysis of Chemical Vapor Deposited Diamond Coated Cutting Tools by Synchrotron X‐Ray Diffraction in Transmission Geometry. Issue 11 (3rd May 2021)

• Record Type: Journal Article
• Authors: Hinzmann, Daniel; Böttcher, Katrin; Reimers, Walter; Uhlmann, Eckart
• Other Names: Müller Martin guestEditor.; Busch Sebastian guestEditor.; Krywka Christina guestEditor.; Moulin Jean-Francois guestEditor.; Pyczak Florian guestEditor.; Staron Peter guestEditor.; Thiry Marc guestEditor.
• Is Part Of: Advanced engineering materials. Volume 23:Issue 11(2021)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-05-03
• Subjects: chemical vapor deposited diamond -- cutting tools -- residual stresses; Materials -- Periodicals; 620.11
• DOI: 10.1002/adem.202001525
• Languages: English
• ISSNs: 1438-1656

Abstract

Abstract : When machining difficult‐to‐cut, nonferrous materials, chemical vapor deposited (CVD) diamond–coated cutting tools are applied. The tools' favorable mechanical property profile is based on the hardness of the coating as well as the adaptability of the substrate. Nevertheless, the reproducibility of machining results and process stability are limited by insufficient coating adhesion. The resulting cutting tool failure is based on coating delamination initiated by crack development. By assessing residual stress as an influence of coating adhesion, an analysis of CVD diamond–coated tools is performed using synchrotron X‐ray diffraction in transmission geometry. Investigation of a nanocrystalline and multilayer morphology on cobalt‐based tungsten carbide (WC‐Co) and a silicon nitride–based ceramic (Si3 N4 ) provides the distribution of the principal in‐plane residual stress tensor component σ 22 depending on the coating morphology and substrate material. Contrary to microcrystalline CVD diamond, nanocrystalline layers decrease the compressive residual stress. In addition, the CVD diamond coating deposited on the Si3 N4 substrate material tends to induce an overall initial tensile residual stress that leads to increased tool performance compared to WC‐Co‐based coated tools. Variation of the coating morphology as well as the substrate material offers the possibility to extend the current model for residual stress–dependent tool failure. Abstract : Based on a novel approach by using synchrotron X‐ray diffraction in transmission geometry, a detailed investigation of the principal residual stress state of chemical vapor depositioned diamond coated cutting tools was performed. For varying cutting tool specifications, differing principal residual stress was documented and subsequently correlated with the respected cutting tool application of CFRP machining.