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Examination of the effect of tin particles and grain size on the charpy impact transition temperature in steels

Du, Jinlong (2012)
M.Res. thesis, University of Birmingham.

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Abstract

The toughness of ferritic steels is influenced by the grain size distribution, second phase, precipitates and coarse inclusions. In this work an examination of the effect of coarse TiN particles (> 0.5 \(\mu\)m) and ferrite grain size on the Charpy impact transition temperature in high strength low alloyed steels has been carried out. Steels with high (up to 0.045 wt %) Ti content, have been heattreated and furnace cooled to obtain a ferrite-pearlite microstructure with different ferrite grain sizes. Coarse TiN particle size and ferrite grain size distributions have been measured and Charpy impact testing has been carried out. Scanning electron microscopy (SEM) analysis was used to measure the grain boundary carbide thickness and for fractographic analysis to determine if the coarse TiN particles are acting as cleavage initiation sites. The Charpy ductile-brittle transition temperatures (DBTT) have been predicted using standard literature equations, and compared to the measured values. It has been found that there was no significant effect of the coarse TiN particles on shifting the Charpy impact DBTT with the DBTT values being adequately predicted by literature equation across the ferrite grain size range from 5 – 27 \(\mu\)m.

Type of Work:M.Res. thesis.
Supervisor(s):Davis, Claire and Strangwood, Martin
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:Department of Metallurgy and Materials, School of Engineering
Subjects:TA Engineering (General). Civil engineering (General)
TN Mining engineering. Metallurgy
TS Manufactures
Institution:University of Birmingham
ID Code:3455
This unpublished thesis/dissertation is copyright of the author and/or third parties.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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