Tensile Properties of TWIP Steel at High Strain Rate

Tensile tests of TWIP steels of two compositions are performed in the strain rate range of 10−5 − 103 s−1. Results indicate that steel 1# does not exhibit TWIP effect but deformation-induced martensitic transformation appears only. There exists TWIP effect in steel 3#. Tensile properties at room temperature are sensitive to strain rate in the studied strain rate ranges. Analysis on the relationship between strain-hardening exponent and strain rates shows that strain-induced martensitic transformation and formation of twins during deformation have significant in-fluence on their strain-hardening behavior.