NDLI: Microstructural and mechanical properties of microalloyed steels processed to simulate thin slab casting and direct rolling conditions

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Microstructural and mechanical properties of microalloyed steels processed to simulate thin slab casting and direct rolling conditions

Content Provider	Semantic Scholar
Author	Fernández, A. I. Uranga, Pello Lopez, Beatriz Villar Rodríguez-Ibabe, J. M.
Copyright Year	2013
Abstract	Plane strain compression tests have been used to simulate Conventional Controlled Rolling (CCR) and Thin Slab Direct Rolling (TSDR) of a Nb and a Nb-Ti microalloyed steel. Reheating at the very high temperature of 1400oC was used to simulate the TSDR initial conditions, while a lower reheating temperature of 1200oC was applied in the simulations of conventional CCR process. After deformation and air cooling ferrite+pearlite structures were obtained in both simulations, however, the TSDR simulation exhibited a more heterogeneous microstructure and coarser mean ferrite grain size for both steels than that obtained in the CCR simulation. The conventional tensile properties of the achieved microstructures have been evaluated. Fracture toughness tests (fatigue precracked 3 pb specimens) were performed. The behaviour was completely ductile for both processing routes in the Nb steel, whilst it was found a big difference between both processing routes in the Nb-Ti steel. In the latter the behaviour observed after CCR simulation was ductile, but the TSDR simulation behaviour was ductile-brittle. Fractographic analysis indicates that this different behaviour can be related to the much more heterogeneous grain size distribution present in the microstructure corresponding to the TSDR simulation comparing to the CCR one, and the presence of coarse TiN particles (>1μm). In the TSDR process the big fraction of coarse grains is the microstructural parameter controlling the cleavage fracture when the coarse TiN particles are broken.
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://www.gruppofrattura.it/ocs/index.php/esis/ECF13/paper/download/8561/5001
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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