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|Type:||Artigo de evento|
|Title:||Carbonitride Precipitation In Microalloyed Steel V-nb Thin Slabs Thermomecanically Treated [precipitação De Carbonitretos Em Placas Finas De Aço Microligado V-nb Submetidas A Tratamento Termomecânico]|
|Abstract:||Transmission electron microscopy was used in order to investigate the precipitation of fine carbonitride particles in two thin slabs of vanadium and niobium microalloyed steels during thermomechanical processing. The slabs were solidified in a thin slab casting simulator and subsequently hot rolled from 42 to 12 mm thickness on a laboratory-scale rolling mill. The rolling schedule included 3 roughing passes and 5 finishing passes (with two different temperature regimes for finish rolling), followed by a simulated coiling stage in a tunnel furnace and finally air cooling. TEM results showed interphase precipitation and fine precipitation in austenite whose contributions to yield strength were calculated from the Orowan-Ashby model and compared to an empirical equation which accounts for strengthening effects from the steel's chemical composition and ferrite grain size. The amount of precipitation strengthening was estimated to have reached 130 MPa in one of the slabs, and 146 and 106 MPa, respectively, in the other slab, depending upon the finish rolling temperatures.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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