Mechanical properties and fractographic analysis of high manganese steels after dynamic deformation tests

Since few years many research centres conducting research on the development of high-manganese steels for manufacturing of parts for automotive and railway industry. Some of these steels belong to the group of AHS possessing together with high strength a great plastic elongation, and an ideal uniform work hardening behavior. The article presents the dynamic mechanical properties of two types of high manganese austenitic steel with using a flywheel machine at room temperature with strain rates between Sx10²÷3.5×10³ s^-1. It was found that the both studied steels exhibit a high sensitivity R_m to the strain rate. With increasing the strain rate from 5×10² to 3.5×10³ s^-1 the hardening dominates the process. The fracture analysis indicate that after dynamic test both steel is characterized by ductile fracture surfaces which indicate good plasticity of investigated steels.