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2024 (English)In: Acta Materialia, ISSN 1359-6454, E-ISSN 1873-2453, Vol. 263, article id 119538Article in journal (Refereed) Published
Abstract [en]
We report on phase and strain changes in Ti1-xAlxN (0 ≤ x ≤ 0.61) coatings on cutting tools during turning recorded in operando by high-energy x-ray diffractometry. Orthogonal cutting of AISI 4140 steel was performed with cutting speeds of 360–370 m/min. Four positions along the tool rake face were investigated as a function of time in cut. Formation of γ-Fe in the chip reveals that the temperature exceeds 727 °C between the tool edge and the middle of the contact area when the feed rate is 0.06 mm/rev. Spinodal decomposition and formation of wurtzite AlN occurs at the positions of the tool with the highest temperature for the x ≥ 0.48 coatings. The strain evolution in the chip reveals that the mechanical stress is largest closest to the tool edge and that it decreases with time in cut for all analyzed positions on the rake face. The strain evolution in the coating varies between coatings and position on the rake face of the tool and is affected by thermal stress as well as the applied mechanical stress. Amongst others, the strain evolution is influenced by defect annihilation and, for the coatings with highest Al-content (x ≥ 0.48), phase changes.
Place, publisher, year, edition, pages
Elsevier, 2024
Keywords
X-ray diffraction, Coatings, Synchrotron diffraction, Wear mechanisms
National Category
Manufacturing, Surface and Joining Technology
Identifiers
urn:nbn:se:liu:diva-199903 (URN)10.1016/j.actamat.2023.119538 (DOI)001165860300001 ()
Note
Funding: This study was performed within the framework of the competence center FunMat-II that is financially supported by Vinnova (grant no 2016–05156). The use of PETRA III was enabled through the Röntgen-Ångström Cluster frame grant (grant no VR 2017–06701). The Swedish government strategic research area grant AFM (SFO Mat LiU, grant no 2009–00971) and the Swedish Foundation for Strategic Research (grant no APR20–0029) are acknowledged for financial support.
2024-01-032024-01-032024-03-12Bibliographically approved