Abstract
Multi-axis deformation (MAD) tests were performed on a low carbon microalloyed steel with different process parameters. The effect of temperature and strain on the microstructure evolution were analyzed. The strain reversal effect was observed from the comparison between the microstructure resulting from the MAD process and the one from a uniaxial deformation process. However, with 0.3 strain per pass and the alternating compression time equal to 10 or more during the MAD process, ultra fine structures were obtained at deformation temperature below 800 °C. Due to the microalloyed elements in the tested steel, nanometer sized precipitates were introduced under MAD conditions, which also contributed to the microstructure refinement.
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