Converging criteria to characterize crack susceptibility in a micro-alloyed steel during continuous casting

A

Document identifier: oai:DiVA.org:ltu-76945
Access full text here:10.1016/j.msea.2019.138691
Keyword: Engineering and Technology, Materials Engineering, Other Materials Engineering, Teknik och teknologier, Materialteknik, Annan materialteknik, Crack susceptibility, Total energy, Reduction of area, Flow-response curves, Continuous casting, Engineering Materials
Publication year: 2020
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SDG 9 Industry, innovation and infrastructure
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Abstract:

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.

Authors

Rosa Maria Pineda Huitron

Luleå tekniska universitet; Materialvetenskap
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Pavel E. Ramirez Lopez

Casting and Flow Simulation Group, Process Metallurgy Department, SWERIM AB, Luleå, Sweden. Materials Science and Engineering, Royal Institute of Technology (KTH), Stockholm, Sweden
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Esa Vuorinen

Luleå tekniska universitet; Materialvetenskap
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Robin Jentner

Luleå tekniska universitet
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Maija E. Kärkkäinen

SSAB Europe Oy Raahe works, Raahe, Finland
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