Hot Deformation Behavior and Processing Maps for a Large Marine Crankshaft S34MnV Steel

摘要

> The hot deformation behavior of S34MnV steel is investigated by means of hot compression tests at temperatures between 1223 and 1473?K (950 to 1200?°C) and strain rates of 0.05–2?s ?1 . Hyperbolic sine type of constitutive equation is established. The activation energy Q is 321.943?kJ?mol ?1 , near to the austenite lattice self‐diffusion activation energy. The processing maps under different strains are constructed based on the dynamic materials model (DMM) and Prasad's instability criterion. The instability regions vary as the strain increases. The flow instability with a strain of 0.7 approximately happens at the lower temperature 1223–1398?K (950–1125?°C) and higher strain rate 0.2–2 s ?1 .