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Application of microstructural texture parameters to diffusional and displacive transformation products

Fuchs, Alexander (2005)
Ph.D. thesis, University of Birmingham.

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Abstract

The measurement of materials properties and the control of processing parameters is important for both materials development and quality control. Determination of these parameters is sometimes advantageous if done by means of microstructural characterisation as here additional information may be gained from the sample. These values, e.g. the grain size or the volume fraction of the present microconstituents, may allow the correlation with mechanical properties or processing properties. Unfortunately, the diffusional and displacive transformation products, martensite and bainite, exhibit very fine microstructures with a low contrast, so that conventional microstructural image analysis cannot be applied readily to distinguish these structures. As an alternative microstructural characterisation technique texture analysis based on Haralick parameters calculated from second order grey value statistics was successfully applied. It has been shown that the analysis of large sample areas can be done automatically enabling the correlation of the texture data with the respective local microhardness using a neural network. The analysis is limited due to the dependence of the texture parameters on preparation and imaging conditions. A more detailed understanding of the individual Haralick parameters will be the basis to extend the method to a correlation with other properties of the sample that may be not easily accessible by physical testing, such as toughness.

Type of Work:Ph.D. thesis.
Supervisor(s):Strangwood, Martin
School/Faculty:Schools (1998 to 2008) > School of Engineering
Department:Metallurgy and Materials Science
Subjects:TN Mining engineering. Metallurgy
Institution:University of Birmingham
Library Catalogue:Check for printed version of this thesis
ID Code:212
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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