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Title: Characterisation of Grain Boundaries and Precipitation in Ferritic Steel Rods
Author: Ahmed, Shafiq
Awarding Body: University of Oxford
Current Institution: University of Oxford
Date of Award: 2007
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During the wire drawing process, steel rod needs to be drawn at ever higher speeds in order to maximise productivity without fracture. It is essential that the wire has low strength and high ductility with uniform properties. The ductility of the rod is directly related to the grain size. Boron is known to increase the ferrite grain size. In order to understand the influence of boron on the grain size and microstructure of a series of low carbon steel rods an audit of the different particle types present and their distribution in the grain and segregated along grain boundaries was carried out using a variety of techniques. Imaging of key elemental distributions was undertaken using a new Cameca NanoSIMS 50 instrument. This instrument provides the high sensitivity, spatial and mass resolution required for the identification of small precipitates and the analysis of segregation of light elements that are traditionally difficult to study by other microanalytical techniques. The results from the sequential characterisation of exactly the same area of a sample using first Transmission Electron Microscopy (TEM) and then NanoSIMS permits the direct comparison of sensitivity and spatial resolution on precisely the same individual particles. TEM has also identified a large population of quenched-in vacancy loops present in the samples produced by deformation. These may be associated with small precipitates which could also influence the bulk properties of the rod.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available