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The influence of niobium on the static recrystallization of hot deformed austenite and on strain induced precipitation kinetics

AutorMedina, Sebastián F.
Palabras claveNiobium
Static recrystallization
Fecha de publicación1995
CitaciónScripta Metallurgica et Materialia 32 (1) : 43-48 (1995)
ResumenOf all the low-carbon microalloyed steels, Nb steels are the most widely used due to the fact that the strain induced precipitates are smaller than with Vanadium or Titanium steels. These steels improve the yield strength and, above all, because the static recrystallization critical temperature (SRCT), or the temperature at which the inhibition of static recrystallization begins as a consequence of the strain induced precipitation, is higher for similar percentages of the microalloy. For example, with small quantities of Nb, in the region of 0.040 (% wt), the values of SRCT for the precipitation of carbonitrides are greater than 900°C; therefore, the temperature interval until A,, is large enough to comfortably achieve, by the application of one or more strains, a hardening of the austenite (pancaking) and, consequently, a smaller ferrite grain size after the y + (Y transformation.
Versión del editorhttp://dx.doi.org/10.1016/S0956-716X(99)80009-0
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