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An investigation concerning the heat treatment of duplex ferritic-martensitic 1010 and 1020 steels has been carried out. Tensile and impact properties of intermediately quenched and continuously annealed specimens have been characterized and microstructural correlations established. The rule for two phase mixtures may be used as a fairly good approximation of the mechanical behavior of the duplex system, and improved correlations are possible with suitable modifications for the size, shape and distribution of the second phase. The property differentials between the duplex 1010 and 1020 at equal volume fractions of martensite are due mainly to the higher carbon content (hence, higher strength) of the 1020 martensite. Important metallurgical variables include subgrain formation, retained austenite, transformation twinning and martensite fraction. Of these, the volume fraction of martensite appears to be the most influential in controlling the strength, ductility and impact properties of the duplex systems studied.

Heat treatment and characterization of duplex 1010 and 1020 steels