Research on Thermal Deformation Behavior of Marine Crankshaft S34MnV Steel

Abstract

Hot deformation behavior of S34MnV steel was studied by isothermal compression tests. According to the experimental results, the influence of strain rate and deformation temperature on flow stress is analyzed. The results indicate that for S34MnV steel with same deformation, the flow stress decreases with the increase in deformation temperature when the strain rate is constant, and increases with the increase in strain rate when the temperature is fixed. It established that a five‐order polynomial Arrhenius‐type constitutive equation which based on strain compensation. The correlation coefficient R between the predicted value and the experimental value is 0.9943, and the average absolute relative error (AARE) (%) value is calculated to be 3.9749%. The dynamic material model (DMM) diagram of thermal processing map is also drawn to investigate the workability of S34MnV steel, and it suggests that the best thermal processing conditions for S34MnV steel are predicated to be within the strain rate range of 0.03–0.6 s−1 and deformation temperature range of 1030–1150 °C. In the suggested domains, the peak value of the power dissipation efficiency is between 34% and 39%.