| TWIP steel has strong strength and high toughness, the values of the tensile strength andductility are very high.Considering of saving materials,the Fe-17Mn-0.4C steel,Fe-17Mn-0.8C steel and Fe-30Mn-0.4C steel have been designed. And the deformation resistance, impact toughness and strength-ductility had been researched.1. During the hot deformation, Fe-17Mn-0.4C steel and Fe-17Mn-0.8C was researched.In orderto find the relationship among deformation temperature, strain rate, degree of deformation, carboncontent and deformation resistance,the experiment was processed on Gleeble3500hot simulationmachine at the temperature of650℃750℃850℃950℃1050℃1150℃, and at the strain rate of0.01s-1,0.1s-1,1s-1and10s-1. The strain degree is0.7. The machine models of temperature strain rateand deformation resistance had also been built, and the models can provide a more accurateexperimental solution for the practical rolling. According to the models, the recrystallization can becontrolled well. At the same time, the influence of carbon content on the deformation resistance hadbeen found.2. In order to research the impact ductility, Fe-17Mn-0.4C and Fe-30Mn-0.4C TWIP steel hadbeen stroked at impact machine at room temperature.The result of the impact absorbing energy ishigh,it is related to the roll direction. Mn content is also the influence point. The impact fracturewhich havs been observed belongs to the ductility fracture.3. By the solution treatment on Fe-17Mn-0.4C and Fe-30Mn-0.4C TWIP steel, the tensileexperiment was taken.TWIP steel has high extension strength and ductility. And the temperature ofsolution treatment can reduce extension strength and promote ductility. |
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