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Residual stress in CVD coatings: Evaluation of XRD and TEM methods for micro and macrostress determination
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Materials Sciences.
2015 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Cutting tools are subject to extreme environment during processing, with hightemperatures and pressures. CVD coatings are used to increase lifetime andperformance of the WC/Co composite. Residual stresses in the coatings areinteresting as they may be destructive or constructive for the material duringoperation. Blasting is used to change the as-deposited tensile stress to compressive.The usefulness of X-ray diffraction (XRD) and nanobeam diffraction (NBD) forcharacterization of strains in the different coating layers has been investigated. XRDwith different anode materials has been used to determine the macrostress in thelayers and an attempt was done to calculate the average microstrain and crystallitesize. NBD was used to study the microstrain within single grains of the differentmaterials. A specimen preparation method has been developed for the studiedsamples using the FIB.The XRD analysis shows that the measurement condition is of great importanceduring stress measurements. The macrostress of the different samples show that theZrCN type coating is less stressed than the TiCN type coating after deposition. It isalso shown that the ZrCN type coating is less affected by the blasting. Determinationof microstrain and crystallite size from XRD needs further development.The NBD is a good method to evaluate microstrain within single grains, or betweengrains oriented in the same zone axis. The analyses show more strain within thegrains after blasting. The measurements indicate more strain variation in the Al2O3layer in the TiCN system compared to the ZrCN system.

Place, publisher, year, edition, pages
UPTEC K, ISSN 1650-8297 ; 15034
Keyword [en]
residual stress, transmission electron microscopy, TEM, nanobeam diffraction, x-ray diffraction, XRD, CVD, TiCN, Al2O3, ZrCN, blasting
National Category
Materials Chemistry
URN: urn:nbn:se:uu:diva-269050OAI: diva2:882034
External cooperation
Sandvik Coromant
Educational program
Master Programme in Chemical Engineering
Available from: 2016-01-12 Created: 2015-12-13 Last updated: 2016-01-12Bibliographically approved

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