2016 年 1 巻 p. 190-195
In previous studies, the experimental results for the transformation plasticity coefficient in terms of three-point bending system and tensile-torsional-compressive system were different with the same heat treating case for the same tested material. Therefore, in this study, bending-tensile loading system have been proposed to analyze the transformation plasticity behavior and determine the transformation plasticity coefficient. The specimens of S45C steel were heated to austenitization temperature and kept at this temperature for several minutes, then naturally cooled to room temperature. During cooling process before transformation start, bending and tensile stresses have been applied on specimen and have continued to the end of experiment. The maximum bending deflections due to austenite-pearlite transformation have been examined with different loading conditions and then transformation plasticity coefficients were determined. The obtained transformation plasticity coefficient of pearlitic transformation were compared with the results of other test methods such as three-point bending system and tensile-torsional-compressive system.
