Laser-ultrasonic austenite grain size measurements in low-carbon steels

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DOIResolve DOI: http://doi.org/10.4028/www.scientific.net/MSF.715-716.407
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TypeArticle
Proceedings titleRecrystallization and grain growth IV : selected, peer reviewed papers from the Fourth International Conference on Recrystallization and Grain Growth, (ReX & GG 2010), July 4-9, 2010, Sheffield, UK
Series titleMaterials Science Forum; Volume 715-716
ConferenceFourth International Conference on Recrystallization and Grain Growth, July 4-9, 2010, Sheffield, England
ISSN0255-5476
ISBN9783037853900
Pages407414; # of pages: 8
SubjectAustenite decomposition; Austenite grain size; Austenite microstructure; Laser-generated ultrasound; Steel samples; Thermo-mechanical processing; Grain growth; Isotherms; Low carbon steel; Microstructure; Recrystallization (metallurgy); Ultrasonic applications
AbstractAustenite grain size is an important microstructure parameter when processing steels as it provides the initial condition for the austenite decomposition that determines the final microstructure and thus properties of the steel. In low-carbon steels it is frequently difficult if not impossible to quantify the austenite grain size using conventional metallographic techniques. Laserultrasonics provides an attractive alternative to quantify the grain size in-situ during thermomechanical processing of a steel sample. The attenuation of the laser generated ultrasound wave is a function of the grain size. The present paper gives an overview on the state-of-the-art of this novel measurement technique. Using isothermal and non-isothermal grain growth tests in low-carbon steels the advantages and limitations of laser-ultrasonic measurements will be demonstrated. Further, their application for deformed samples will be presented to quantify austenite grain sizes during and after recrystallization. The in-situ measurements provide significantly new insights into the austenite microstructure evolution during thermo-mechanical processing of low-carbon steels. The implications on expediting the development of improved process models will be discussed. © (2012) Trans Tech Publications, Switzerland.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada; NRC Industrial Materials Institute
Peer reviewedYes
NRC number52476
NPARC number16891215
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Record identifier661a5441-4fb8-4fd7-80ed-7d37bc1fa42c
Record created2011-02-17
Record modified2016-05-09
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