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Improvement of technique and evaluation methods for Gradient Solidification of Carbon Steels - Master Thesis
RISE, Swerea, Swerea KIMAB.
2013 (Swedish)Report (Refereed)
Abstract [sv]

Carbon steels with carbon content between 0.1% and 0.5% are highly susceptible to surface cracks during continuous casting. This is due to the volume contraction caused by peritectic transformation during solidification. Due to the high cooling rates in continuous casting, the experimental description of phase evolution during solidification is difficult. In this study directional solidification experiments are conducted to simulate the microstructural evolution and subsequent solid state phase transformation in continuous casting for three grades of carbon steel. Additionally a well-function method is developed for sample preparation for gradient solidification experiments and bar-shape samples are provided through quartz tubes. Directional solidification experiments with different cooling rates are conducted in a furnace and quenched at the end of process. The solidification of the alloys was observed to start with formation of primary ferrite and followed by the peritectic reaction. During the solidification the γ phase was formed on the δ surface along the δ/L interface and completely surrounded the δ/L interface. The growth of γ phase on the δ phase continued throughout the peritectic transformation and under the certain conditions the γ phase grew by upward direct solidification from the liquid. The fine structure ahead of the solidification front caused by quenching of the melt at the end of process was a help to distinguish L/S interval. The distance between the solidification front and two phase region where the solidification is complete was estimated to be around 7- 10 mm.

Place, publisher, year, edition, pages
Swerea KIMAB AB , 2013.
Series
Rapport / Institutet för metallforskning, ISSN 1403-848X ; KIMAB-2013-127
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-13023OAI: oai:DiVA.org:ri-13023DiVA, id: diva2:973217
Available from: 2016-09-22 Created: 2016-09-22Bibliographically approved

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