Lookup NU author(s): Professor Steve Bull
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The residual stress state of coatings or oxide scales can be critically important in dictating their performance. When the residual stress in the coating is compressive the substrate is put into tension and, as the temperature increases, it can reduce this tensile stress by creep processes which in turn will reduce the stress in the coating. A model has been developed to characterise this process by predicting how stress is generated and relaxed during coating deposition or scale growth. The output from the model has been validated by experimental measurements on vapour deposited TiN on stainless steel and alumina scales on a weak alloy (FeCrAlY) and a strong alloy (MA956) substrate and shows excellent agreement to experimental data measured by X-ray diffraction. The amount of stress relaxation by creep depends on the thickness of the substrate and coating, the time of exposure at temperature and the cooling rate as well as on the creep properties of the substrate materials.
Author(s): Bull SJ
Editor(s): Nicholls, J; Rickerby, D
Publication type: Conference Proceedings (inc. Abstract)
Publication status: Published
Conference Name: 6th International Conference on Engineering the Surface
Year of Conference: 2000
Number of Volumes: 1
Publisher: IOM Comunications Ltd.
Library holdings: Search Newcastle University Library for this item