The Effects of Finish Rolling Temperature and Niobium Microalloying on the Microstructure and Properties of a Direct Quenched High-Strength Steel

• Autorzy: Kaijalainen A. , Vähäkuopus N. , Somani M. , Mehtonen S. , Porter D. , Kömi J.

Identyfikatory

DOI

10.1515/amm-2017-0091

• Języki publikacji: EN

Abstrakty

EN

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.

Słowa kluczowe

EN

direct quenching; hot rolling; Nb microalloying; microstructure; CCT diagram

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2017
• Tom: Vol. 62, iss. 2A
• Strony: 619--626
• Opis fizyczny: Bibliogr. 29 poz., rys., tab.

Twórcy

autor

Kaijalainen A.

• University of Oulu, Materials Engineering and Production Technology, Oulu, Finland

autor

Vähäkuopus N.

• University of Oulu, Materials Engineering and Production Technology, Oulu, Finland

autor

Somani M.

• University of Oulu, Materials Engineering and Production Technology, Oulu, Finland

autor

Mehtonen S.

• SSAB Europe Oy, Raahe, Finland

autor

Porter D.

• University of Oulu, Materials Engineering and Production Technology, Oulu, Finland

autor

Kömi J.

• University of Oulu, Materials Engineering and Production Technology, Oulu, Finland

Bibliografia

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Uwagi

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).