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- Title
THE EFFECTS OF FINISH ROLLING TEMPERATURE AND NIOBIUM MICROALLOYING ON THE MICROSTRUCTURE AND PROPERTIES OF A DIRECT QUENCHED HIGH-STRENGTH STEEL.
- Authors
KAIJALAINEN, A.; VÄHÄKUOPUS, N.; SOMANI, M.; PORTER, D.; KÖMI, J.; MEHTONEN, S.
- Abstract
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.
- Subjects
HIGH strength steel metallography; HOT rolling; MICROALLOYING; MICROSTRUCTURE; QUENCHING (Chemistry); NIOBIUM alloy metallography; THERMOMECHANICAL treatment; METALS; AUSTENITE
- Publication
Archives of Metallurgy & Materials, 2017, Vol 62, Issue 2, p619
- ISSN
1733-3490
- Publication type
Article
- DOI
10.1515/amm-2017-0091