Abstract
Warm deformation of a low carbon steel with martensite starting structure (MSS) was investigated by Gleeble 3500 simulator, processing through a strain of 0.7 at deformed rates (1–0.001 s−1) and temperatures (600–700°C), the microstructure of ultrafine grained (UFG) steel was observed by transmission electron microscope (TEM) image. The results indicated that the flow stress increased with increasing strain rate and decreasing temperature, the formation of UFG structure of the warmly deformed steel is atributed to deformation refinement, phase transition refinement of martensite and dynamic recystallization (DRX) refinement, a high tensile strength (570 MPa) was obtained with a suitable total elongation (16%) under a deformed temperature of 600°C and a strain rate of 0.001 s−1. The constitutive equation was built up and the math model was:
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