Papers by Author: W. Bevis Hutchinson

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Authors: Lena Ryde, Joacim Hagström, W. Bevis Hutchinson
Abstract: Work has been carried out at KIMAB to determine the best, industrially feasible, conditions for producing TRIP steel sheet with the aim of obtaining a tensile strength of 600 MPa and a ductility of 30% through a hot-dip galvanising process schedule. Two of the most promising steels were selected to study the microstructures and to follow the transformation from ferrite to austenite in more detail, as well as to examine the stability of the austenite during deformation. This investigation has been performed mainly with the aid of the EBSD technique.
Authors: G. Bermig, A. Bartels, H. Mecking, A. Oscarsson, W. Bevis Hutchinson
Authors: W. Bevis Hutchinson
Abstract: The paper surveys various types of dislocation substructure that are created by plastic deformation in metals. Special reference is made to those substructures that accommodate sharp misorientations as these are of fundamental importance to the nucleation of recrystallisation. Several different mechanisms can give rise to high misorientations; these are discussed in terms of the factors that control them and their relationships to orientation and texture. Different mechanisms for nucleation of recrystallisation may occur depending on the type of substructure, allowing some practical control over the final recrystallised texture.
Authors: Tadeusz Siwecki, T. Koziel, W. Bevis Hutchinson, Per Hansson
Authors: W. Bevis Hutchinson, Bradley P. Wynne
Abstract: Possible effects of stress on the movement of grain boundaries and phase boundaries are considered in terms of available driving forces and mechanisms. Examples of some of these effects are presented from the literature and new experimental results. Stress may influence the kinetics of transformation and also the microstructure and texture of the product material.
Authors: Lena Ryde, W. Bevis Hutchinson, Tomoji Kumano
Abstract: Island grains have been studied in iron samples that had been treated by critical-strainannealing and in commercial silicon iron alloy sheets after incomplete secondary recrystallisation. Such islands remain behind because their boundaries have such a low mobility that the grains cannot shrink away in the time available during annealing. Misorientations of these islands in relation to the grains surrounding them were measured using EBSD. Similar results were observed in both materials. A small number of low angle boundaries were found and also many twin boundaries. The most remarkable observation, however, was the presence of many general high angle boundaries that did not correspond to any evident coincidence relation.
Authors: Eva Lindh-Ulmgren, Mattias Ericsson, Dorota Artymowicz, W. Bevis Hutchinson
Abstract: Laser-Ultrasonics (LUS) provides a means of obtaining microstructure information continuously and non-destructively both in the laboratory and for quality control on-line in industry. Ultrasound is both generated and recorded using lasers which permits remote, non-contact operation with fast sampling and also the capability of working at high temperatures or at moving surfaces, for example during industrial continuous annealing. Examples of dynamic heating trials will be presented for samples of cold rolled steel sheets where primary recrystallisation and ferrite austenite transformation are monitored in-situ as a function of temperature. Examples are also presented where the grain size of low carbon steels have been quantitatively analysed and show very good agreement with microscopy methods.
Authors: Margareta Nylén, Ulla Gustavsson, W. Bevis Hutchinson, Åke Karlsson, Hans Johansson
Authors: Margareta Nylén, Ulla Gustavsson, W. Bevis Hutchinson, Anna Örtnäs
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