Effects of composition and processing parameters on precipitation and texture formation in microalloyed interstitial free high strength (IFHS) steels

Abstract

Precipitation in IFHS steels affects texture formation during annealing, which in turn determines the formability. The single most important type of precipitates in IFHS steels is FeTiP. Precipitation of FeTiP leads to the decrement in the intensity of the favourable {111} texture, which causes a degradation of the formability properties. The batch annealed steels are particularly susceptible to this. Since formation of FeTiP as well as of the other types of precipitates in IFHS steels is dependent on steel composition and processing parameters, a detailed and systematic investigation is urgently needed to look into the various aspects of precipitation in IFHS steels. Proper scientific investigation is expected to provide necessary processing windows that will not allow formation of unwanted precipitates. This will help in maximising the strengthening effects of P, without any degradation of the deep drawability of the steels.