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Microstructures and properties of three Nb micro-alloyed steels were studied through hot rolling experiment.The result indicates that the ferrite grain size(dF) decreases with increasing Nb content(Nb),and the bainite fraction(fB) increases with increasing Nb content(Nb).The effect of ferrite grain size(dF) on yield strength(σy) is related to Nb content(Nb),and the effect of bainite fraction(fB) on yield strength(σy) is unrelated to Nb content(Nb).Modelling of yield strength(σy) for Nb micro-alloyed steels with high accuracy has been built up with Nb content(Nb) and bainite fraction(fB) taken into account as new parameters,and formulas for ferrite grain size(dF) and bainite fraction(fB) vs Nb content(Nb) have also been established under the experiment conditions.The research results could provide instructions for industrial productions.
Microstructures and properties of three Nb micro-alloyed steels were studied through hot rolling experiment. The results indicates that the ferrite grain size (dF) decreases with increasing Nb content (Nb), and the bainite fraction (fB) increases with increasing Nb content ( Nb). The effect of ferrite grain size (dF) on yield strength (σy) is related to Nb content (Nb), and the effect of bainite fraction (fB) on yield strength (σy) is unrelated to Nb content .Modelling of yield strength (σy) for Nb micro-alloyed steels with high accuracy has been built up with Nb content (Nb) and bainite fraction (fB) taken into account as new parameters, and formulas for ferrite grain size (dF) and bainite fraction (fB) vs Nb content (Nb) have also been established under the experiment conditions. the research results could provide instructions for industrial productions.