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Tensile tests of TWIP steels of two compositions are performed in the strain rate range of 10~(-5)-10~3s~(-1). Results indicate that steel 1~# does not exhibit TWIP effect but deformation-induced martensitic transformation ap- pears only.There exists TWlP 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.
Tensile tests of TWIP steels of two compositions are performed in the strain rate range of 10 ~ (-5) -10 ~ 3s ~ (-1). Results indicate that steel 1 ~ # does not exhibit TWIP effect but deformation- induced martensitic transformation ap- pears only.There exists TWlP 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.