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1	Utilisation of Kernel Average Misorientation (KAM) to analyse the microstructure of cemented carbide after plastic deformation Caroline, Löwnertz January 2024 (has links) Cemented carbide tools are subjected to high loads and temperatures during use. Long before any significant wear can occur on the tool, the material will experience plastic deformation. The purpose of this master thesis was to investigate how Kernel Average Misorientation (KAM) can be utilised to analyse plastic deformation within the microstructure or grains of cemented carbides. Six different cemented carbides were investigated. The materials were plastically deformed by utilizing cutting tests with a feed rate staircase method to induce the plastic deformation. Each material was characterised by using Scanning Electron Microscopy (SEM) either equipped with a secondary electron detector or an Electron Backscatter Diffraction detector (EBSD). This made it possible to investigate the WC grain size, Co infiltration, step formation, cavities and pores, KAM and the average grain size. It was concluded that KAM showed to be a valuable tool to visualise the plastic deformation in the materials. There were some limitations to KAM regarding materials with similar amounts of plastic deformation. Additionally, the data from KAM could be used to create graphs to more easily display the misorientation. However, KAM cannot showcase the mechanisms that lead to plastic deformation. Other characterisation methods are needed as a compliment to completely understand what is happening in the material on a microstructural level. Cemented carbide Analysis method Kernel Average Misorientation KAM Plastic deformation pores cavities voids Cobalt infiltration stepping Hårdmetall Analysmetod KAM Porer Plastisk deformation Kobolt infiltrering stegning Metallurgy and Metallic Materials Metallurgi och metalliska material Composite Science and Engineering Kompositmaterial och -teknik Materials Chemistry Materialkemi

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Utilisation of Kernel Average Misorientation (KAM) to analyse the microstructure of cemented carbide after plastic deformation