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This paper comprehends the effects of finish rolling temperature (FRT) and Nb-microalloying on the microstructural evolution and resultant properties of a low carbon direct quenched steel in the yield strength category of ≥900 MPa. Results indicate that a decrease in FRT close to Ar3 temperature significantly influenced the microstructure following phase transformation, especially at the subsurface (~50-400 μm) of the rolled strip. On decreasing the FRT, the subsurface microstructure revealed a fine mixture of ferrite and bainite obviously as a result of strain-induced transformation, whereas the structure at the centreline remained essentially martensitic. Further, Nb-microalloying promoted the formation of ferrite and bainite even at higher FRTs, thus influencing the mechanical properties. The microstructures of the hot-rolled strips were further corroborated with the aid of CCT diagrams.
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Tom
Strony
619--626
Opis fizyczny
Bibliogr. 29 poz., rys., tab.
Twórcy
autor
- University of Oulu, Materials Engineering and Production Technology, Oulu, Finland
autor
- University of Oulu, Materials Engineering and Production Technology, Oulu, Finland
autor
- University of Oulu, Materials Engineering and Production Technology, Oulu, Finland
autor
- SSAB Europe Oy, Raahe, Finland
autor
- University of Oulu, Materials Engineering and Production Technology, Oulu, Finland
autor
- University of Oulu, Materials Engineering and Production Technology, Oulu, Finland
Bibliografia
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- [8] A.J. Kaijalainen, M. Liimatainen, V. Kesti, J. Heikkala, T. Liimatainen, D.A. Porter, Metall. Mater. Trans. A. 47, 4175-4188 (2016).
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Uwagi
PL
Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).
Typ dokumentu
Bibliografia
Identyfikator YADDA
bwmeta1.element.baztech-b9a354fb-3d2a-4c0d-9ba9-14f437b294d5