Work Hardening Behavior of Fe-Mn-C-Al Series TWIP Steel during Tensile Process
The annealed Fe-Mn-C-Al twinning induced plasticity(TWIP)steel was subjected to unidirectional tensile test at room temperature with different deformation amounts(1.5％,4.0％,39.0％,47.0％,52.0％,62.0％).The work-hardening behavior and microstructure evolution of the steel were studied.The results show that with the increase of deformation amount,deformation twins began to appear in the austenitic grain of the test steel,and the density increased continuously.The deformation mechanism changed from dislocation slip to the interaction of twin and dislocation,and the tensile fracture showed typical ductile fracture characteristics.The elastic deformation stage of the test steel was short,there was no obvious yield platform and physical yield point,and there was a long work hardening process in the plastic deformation stage.The work hardening rate of the test steel first decreased sharply with the increase of true strain,and the work hardening mechanism was mainly dislocation strengthening.With the further increase of true strain,the work hardening rate increased gradually,reached a peak value at true strain of 0.55,and then tended to be stable,and the main mechanism of work hardening was twin strengthening.
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