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Quantitative Characterisation of packet Crystallography in high strength steel weld metals
University West, Department of Engineering Science, Division of Mechanical Engineering. (PTW)
2012 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Göteborg: Applied Physics, Chalmers University of Technology , 2012. , 69 p.
Keyword [en]
acicular ferrite, bainite, inclusions, EBSD, SEM, TEM, misorientation, high strength weld metals, microstructure, characterisation
National Category
Engineering and Technology
Research subject
ENGINEERING, Physics
Identifiers
URN: urn:nbn:se:hv:diva-4862OAI: oai:DiVA.org:hv-4862DiVA: diva2:574965
Presentation
2012-11-30, A820, Chalmers, Göteborg, 09:31 (English)
Opponent
Supervisors
Available from: 2012-12-21 Created: 2012-12-07 Last updated: 2015-10-02Bibliographically approved
List of papers
1. Role of inclusions in formation of high strength steel weld metal microstructures
Open this publication in new window or tab >>Role of inclusions in formation of high strength steel weld metal microstructures
2013 (English)In: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936, Vol. 18, no 7, 603-609 p.Article in journal (Refereed) Published
Abstract [en]

A series of high strength weld metals with varying Al content are studied. The inclusions are characterised using energy dispersive X-ray analysis and electron diffraction. The tendency for alignment of the microstructure is characterised quantitatively using electron backscatter diffraction and a recently developed post-processing technique. Correlation is found between the inclusion phases present and the amount of aligned neighbouring grains in the microstructure. It is shown that amorphous Si-Al oxides form at low Al weld metal contents and an Mg-Al spinel at higher contents. The former is associated with less alignment of the microstructure and therefore higher impact toughness. The effect of these inclusions on the formation of the microstructure is discussed.

Place, publisher, year, edition, pages
London, UK: Institute of Materials, 2013
Keyword
High strength steel, welding, Work-integrated Learning, WIL, AIL
National Category
Production Engineering, Human Work Science and Ergonomics Manufacturing, Surface and Joining Technology
Research subject
ENGINEERING, Manufacturing and materials engineering; Work Integrated Learning
Identifiers
urn:nbn:se:hv:diva-4929 (URN)10.1179/1362171813Y.0000000138 (DOI)000324312200009 ()2-s2.0-84883710568 (Scopus ID)
Available from: 2012-12-21 Created: 2012-12-21 Last updated: 2016-02-10Bibliographically approved
2. A new EBSD based methodology for the quantitative characterisation of microstructures formed by displacive fcc–bcc transformations
Open this publication in new window or tab >>A new EBSD based methodology for the quantitative characterisation of microstructures formed by displacive fcc–bcc transformations
2013 (English)In: Micron, ISSN 0968-4328, E-ISSN 1878-4291, Vol. 45, no February, 45-54 p.Article in journal (Refereed) Published
Abstract [en]

This work is concerned with a new methodology that can be used to quantify the degree to which grains in the microstructure are aligned in the form of packets. The methodology is based on a crystallographic definition of the term packet which is used to deduce the theoretically ideal misorientations of intra-packet grain boundaries. A misorientation distribution obtained from extensive EBSD mapping can thus be split into intra- and inter-packet misorientations and the corresponding fractions can be determined by integration. The theoretical framework of the methodology is explained and a step-by-step description of the procedure is given. Results from a trace analysis are provided to justify the assumptions made regarding habit plane and examples are included showing how the grain boundary network can be split into two separate parts, one for lath boundaries and the other for packet boundaries. Moreover, example weld metal microstructures along with the corresponding misorientation distributions as well as quantitative values of the microstructures are presented.

Place, publisher, year, edition, pages
Elsevier, 2013
Keyword
EBSD, misorientations, packets, weld metals, Work-integrated Learning, WIL, AIL
National Category
Metallurgy and Metallic Materials
Research subject
ENGINEERING, Manufacturing and materials engineering; Work Integrated Learning
Identifiers
urn:nbn:se:hv:diva-4888 (URN)10.1016/j.micron.2012.10.012 (DOI)000314332700006 ()2-s2.0-84872501023 (Scopus ID)
Available from: 2012-12-14 Created: 2012-12-14 Last updated: 2016-02-10Bibliographically approved

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