Please use this identifier to cite or link to this item: http://hdl.handle.net/2381/39270
Title: Initiation and growth kinetics of solidification cracking during welding of steel.
Authors: Aucott, L.
Huang, D.
Dong, H. B.
Wen, S. W.
Marsden, J. A.
Rack, A.
Cocks, A. C.
First Published: 11-Jan-2017
Publisher: Nature Publishing Group
Citation: Scientific Reports, 7, Article number: 40255 (2017)
Abstract: Solidification cracking is a key phenomenon associated with defect formation during welding. To elucidate the failure mechanisms, solidification cracking during arc welding of steel are investigated in situ with high-speed, high-energy synchrotron X-ray radiography. Damage initiates at relatively low true strain of about 3.1% in the form of micro-cavities at the weld subsurface where peak volumetric strain and triaxiality are localised. The initial micro-cavities, with sizes from 10 × 10(-6) m to 27 × 10(-6 )m, are mostly formed in isolation as revealed by synchrotron X-ray micro-tomography. The growth of micro-cavities is driven by increasing strain induced to the solidifying steel. Cavities grow through coalescence of micro-cavities to form micro-cracks first and then through the propagation of micro-cracks. Cracks propagate from the core of the weld towards the free surface along the solidifying grain boundaries at a speed of 2-3 × 10(-3) m s(-1).
DOI Link: 10.1038/srep40255
ISSN: 2045-2322
eISSN: 2045-2322
Links: http://www.nature.com/articles/srep40255
http://hdl.handle.net/2381/39270
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
Appears in Collections:Published Articles, Dept. of Engineering

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