Study of the hot deformability of microalloyed steels using torsion tests

摘要

The present paper emphasized the results of experimental researches concerning the influence of microalloying elements on the 31 VMn 12 steel characteristics for oil pipes manufacturing. In order to characterize the hot deformability 31 VMn 12 steels, the torsion test was used for three strain rates. (constant on testing) 0,01; 0.05; 0.1 sec-1 at temperatures of 800 ~0C, 900~0C, 1000~0C; 1100~0C, with strain directly on temperature, in an protective natrium atmosphere, until the failure point is reached. Structural aspects of the material used in the experiments are determined by optical microscopy. By using the interception method the mean value of the conventional diameter, for each heat under the initial deformation temperature condition, was determined.