Structure of Fe-Mn-Al-C Steels after Gleeble Simulations and Hot-Rolling
| Autor: | J. Mazurkiewicz, Wojciech Borek, Krzysztof Matus, L. Sozańska-Jędrasik |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
EBSD microstructure 02 engineering and technology 01 natural sciences lcsh:Technology Article Gleeble simulations Carbide (Ti Nb)C Ferrite (iron) 0103 physical sciences Fe-Mn-Al-C steels M7C3 General Materials Science m7c3 lcsh:Microscopy lcsh:QC120-168.85 thermomechanical processing 010302 applied physics Austenite lcsh:QH201-278.5 lcsh:T Metallurgy Strain hardening exponent 021001 nanoscience & nanotechnology Microstructure κ-carbides lcsh:TA1-2040 Dynamic recrystallization Thermomechanical processing lcsh:Descriptive and experimental mechanics lcsh:Electrical engineering. Electronics. Nuclear engineering 0210 nano-technology lcsh:Engineering (General). Civil engineering (General) lcsh:TK1-9971 Electron backscatter diffraction hot-rolling |
| Zdroj: | Materials Volume 13 Issue 3 Materials, Vol 13, Iss 3, p 739 (2020) |
| ISSN: | 1996-1944 |
| DOI: | 10.3390/ma13030739 |
| Popis: | In this paper, analytical results are compared for the newly developed steels, Fe-Mn-Al-C (X105) and Fe-Mn-Al-Nb-Ti-C (X98), after being hot-rolled and also after undergoing thermomechanical treatment in a Gleeble simulator. These steels have a relatively low density (~6.68 g/cm3) and a content of approx. 11% aluminum. The multistage compression of axisymmetric samples constituting a simulation of the real technological process and hot-rolling performed on a semi-industrial line were carried out using three cooling variants: in water, in air, and after isothermal heating and cooling in water. The temperature at the end of the thermomechanical treatment for all variants was 850 ° C. On the basis of detailed structural studies, it was found that the main mechanism for removing the effects of the strain hardening that occurred during the four-stage compression involved the dynamic recrystallization occurring in the first and second stages, the hot formability and dynamic recovery in successive stages of deformation, and the static and/or metadynamic recrystallization that occurred at intervals between individual deformations, as well as after the last deformation during isothermal heating. Analysis of the phase composition and structure allowed us to conclude that the tested steels have an austenitic-ferritic structure with carbide precipitates. Research using scanning and transmission electron microscopy identified &kappa (Fe, Mn)3AlC and M7C3 carbides in both the analyzed steels. In addition, complex carbides based on Nb and Ti were identified in X98 steel (Ti, Nb)C carbides occurred in the entire volume of the material. Slow cooling after thermomechanical treatment influenced the formation of larger &kappa carbides at the border of the austenite and ferrite grains than in the case of rapid cooling. The size and morphology of the carbides found in the examined steels was varied. Back-scattered electron diffraction studies showed that wide-angle boundaries dominated in these steels. |
| Databáze: | OpenAIRE |
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