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Converging criteria to characterize crack susceptibility in a micro-alloyed steel during continuous casting
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
Casting and Flow Simulation Group, Process Metallurgy Department, SWERIM AB, Luleå, Sweden. Materials Science and Engineering, Royal Institute of Technology (KTH), Stockholm, Sweden.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.ORCID iD: 0000-0002-9100-7982
Luleå University of Technology.
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2020 (English)In: Materials Science & Engineering: A, ISSN 0921-5093, E-ISSN 1873-4936, Vol. 772, article id 138691Article in journal (Refereed) Published
Abstract [en]

The ductility drop and decrease in strength that lead to crack formation during continuous casting of steel is typically investigated by means of the hot ductility test. In this study, hot ductility tests are performed by using a thermo-mechanical Gleeble system to simulate the deformation of steels at high temperatures and low deformation rates similar to those during continuous casting. Thus, temperature was varied between 600 and 1000°C while strain rates covered a range from 0.001 to 0.1s−1. Tests are carried out to identify the temperature range at which the steel is susceptible to crack formation as well as the effect of strain rate. Characterization of fractured surfaces and phase transformation after thermo-mechanical tests are conducted in the SEM and Optical Microscope. The combination of these techniques makes possible to formulate cracking mechanisms during hot processing which show critical strain for failure at temperatures between 700 and 900°C based on the convergence of three different criteria: I) Reduction of area, II) True fracture strength-ductility and III) True total energy. This approach provides a better understanding of crack formation in steels at the high temperatures experienced during continuous casting. This information is key to productivity losses and avoid defect formation in the final cast products.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 772, article id 138691
Keywords [en]
Crack susceptibility, Total energy, Reduction of area, Flow-response curves, Continuous casting
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-76945DOI: 10.1016/j.msea.2019.138691Scopus ID: 2-s2.0-85075854699OAI: oai:DiVA.org:ltu-76945DiVA, id: diva2:1374049
Note

Validerad;2020;Nivå 2;2020-01-29 (johcin)

Available from: 2019-11-28 Created: 2019-11-28 Last updated: 2020-01-29Bibliographically approved

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Pineda Huitron, Rosa MariaVuorinen, Esa

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