Material structure and functionality in product manufacturing

Gerrit Zijlstra


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    This work concentrates on the properties and functionality of materials used in product manufacturing. Special attention is paid to the relation between the material microstructure and its performance. The goal is to reveal the underlying mechanisms which have a controlling influence on the shape change and surface properties of metallic components.

    The shape change of components is caused by residual stresses. These stresses relax due to a creep process which results in a permanent distortion. In this work the process has been modelled, which allows for a study of the contribution of individual process parameters to the shape change.

    The surface properties depend heavily on the chemical composition of the top layer. This layer sometimes has a thickness of only a few nanometers, but can change for example due to exposure to the high temperatures in a furnace. The growth of the oxide layer and the change of the chemical composition has been mapped with high precision. An important discovery during this investigation is that the crystal orientation of the grains at the surface has a predominant influence on the thickness and composition of the oxide layer. From this has been concluded that the generic surface properties can be guided by manipulating the orientation of the crystals at the surface.

    The results of this work can, after the right implementation, contribute to the optimalisation of metal product manufacturing and help to improve the quality of the final product.
    Originele taal-2English
    KwalificatieDoctor of Philosophy
    Toekennende instantie
    • Rijksuniversiteit Groningen
    • de Hosson, Jeff, Supervisor
    • Ocelik, Vaclav, Co-supervisor
    Datum van toekenning23-nov-2018
    Plaats van publicatie[Groningen]
    Gedrukte ISBN's978-94-034-0981-8
    Elektronische ISBN's978-94-034-0980-1
    StatusPublished - 2018

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