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Influence of strain on the precipitation kinetics in microalloyed steels

AuthorsMedina, Sebastián F.; Quispe, Alberto
KeywordsMicroalloyed steels
Strain induced precipitation
Precipitation kinetics
Incubation time
Precipitation-time-temperature (PTT) diagrams
Avrami's equation
Issue Date1996
PublisherIron and Steel Institute of Japan
CitationISIJ International 36 (10) : 1295-1300 (1996)
AbstractUsing torsion tests and applying the back extrapolation method, the statically recrystallized fraction of low carbon microalloyed steels containing vanadium, niobium and titanium, respectively, has been determined for different temperatures and strains. From the recrystallized fraction against time curves it is possible to draw precipitation-time-temperature (PTT) diagrams. These diagrams show that the strain does not affect precipitation kinetics in an independent manner, but that this influence is related with the microalloy content. The greater the strain applied, the shorter the incubation time of induced precipitation, but this influence diminishes as the microalloy content increases. It is also demonstrated that the incubation time is practically independent of the nature of the metal microalloy (V, Ti, Nb). In this sense, new expressions are proposed to relate the incubation and precipitation end times with the strain and the microalloy content. A model is also established for precipitation kinetics at the curve nose temperature.
Publisher version (URL)http://dx.doi.org/10.2355/isijinternational.36.1295
Appears in Collections:(CENIM) Artículos
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