DEFORMATION-BEHAVIOR OF A MICROALLOYED STEEL

Rheological parameters have been determined in the 700 - 1050 degrees C temperature range for a strained industrial microalloyed steel by co mpression testing. Their evolution with strain, strain rate and temper ature show the complicated behaviour in the two phases domain, due pro bably to the different plasticity of the austenitic and ferritic phase s, as well as to the various effects of softening processes. The value s of the apparent activation energy of deformation decrease considerab ly at the transition from the austenitic to the two phases domain. In the austenitic domain, they are influenced largely by the precipitate particles.