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In situ observation of bainite to austenite transformation of microalloyed high strength steel during simulated welding cycle

Lei, X. W.; Wang, H. H.; Wu, K. M.; Shirzadi, A. A.; Yin, Y. Q. and Wu, N. C. (2014). In situ observation of bainite to austenite transformation of microalloyed high strength steel during simulated welding cycle. Science and Technology of Welding and Joining, 19(5) pp. 402–407.

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DOI (Digital Object Identifier) Link: https://doi.org/10.1179/1362171814Y.0000000205
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Abstract

A confocal scanning laser microscope, equipped with a high temperature stage, was used for in situ observation of the bainite to austenite transformation in a microalloyed high strength steel. Austenite grain growth was observed and measured directly from 1040°C to the peak temperature of 1340°C during the heating process, as well as the subsequent cooling down to 1040°C. The grain growth rate versus temperature was analysed. It was demonstrated that the austenite grains grew up simultaneously by means of grain boundary migration and ‘grain swallowing’ phenomena. The variation in grain growth rate was attributed to the presence of impeding precipitates, e.g. carbonitrides Nb,Ti(C,N). The work also showed that coarsening and/ or dissolution of carbonitride precipitates, above a certain temperature, led to a fast grain growth. The in situ observation by confocal scanning laser microscope can provide valuable information on the austenite reformation and final microstructure of weldments.

Item Type: Journal Item
Copyright Holders: 2014 Institute of Materials, Minerals and Mining
ISSN: 1362-1718
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetWuhan University of Science & Technology
Extra Information: This paper is part of a special issue on computed-aided welding engineering
Keywords: grain growth; bainite to austenite transformation; confocal scanning laser microscope; microalloyed steel
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Engineering and Innovation
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 44235
Depositing User: Amir Shirzadi
Date Deposited: 01 Sep 2015 09:53
Last Modified: 04 Oct 2016 11:49
URI: http://oro.open.ac.uk/id/eprint/44235
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