Carbo-nitride precipitation and its effect on matrix transformations in high strength-high toughness 300M steel

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http://eprints.org/relation/isVolatileVersionOf http://etheses.bham.ac.uk/id/document/2061 http://eprints.org/relation/ispreviewThumbnailVersionOf http://etheses.bham.ac.uk/id/document/2061 http://eprints.org/relation/isVersionOf http://etheses.bham.ac.uk/id/document/2061 archive 4031 disk0/00/00/08/41 2010-07-08 13:35:16 2019-01-23 09:52:58 2011-07-19 16:24:10 thesis show 0 Jubleanu Anca Marilena Strangwood Martin Davies Claire University of Birmingham Carbo-nitride precipitation and its effect on matrix transformations in high strength-high toughness 300M steel unpub TN 10col_ephy The influences of different austenitisation temperatures on the matrix microstructure and mechanical properties (K1C and hardness) of one cast have been investigated. 300M steel has been austenitised at 925 °C for increasing holding times from 1h to 4h and 1025 °C for 2h holding time. Microstructures were examined by optical and scanning electron microscopy. It has been found out that higher austenitisation temperature alter the microstructure, the fine (<600 nm) precipitate population and subsequently the fracture toughness. The reduced volume fraction of fine particles increased the hardenability of the steel, resulting in an increased percentage of upper bainite, that led to a lower temper response compared to 925 austenitisation temperature. The improved K1C value was attributed to increased dissolution of fine particles due to higher austenitisation temperatures 2010-07 2009-09 graduation eng This unpublished thesis/dissertation is copyright of the author and/or third parties.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. public 71 University of Birmingham School of Metallurgy and Materials m_rs na 2010-07 graduation