Mechanical Properties and Microstructure Evolution of TWIP Steel at Different Strain Rates
Taking Fe-Mn-C-Al TWIP steel as the research object,the experimental steel was annealed and stretched at room temperature,and then tested by XRD,OM and SEM.The mechanical properties,microstructure evolution and fracture morphology of TWIP steel under different strain rates were studied.The results show that the test steel is a single austenite phase after stretching at different strain rates.Under the strain rate of 3.33×10-4-3.33×10-1 s-1,recrystallization and secondary twins appear in the test steel.With the increase of strain rate,the number of recrystallization and secondary twins gradually decrease and disappear.This causes the reduction of tensile strength and elongation.With the increase of strain rate,the microstructure changes from flat to undulating,the dimple size increases from shallow to deep,and the brittle fracture trend of the material is more and more obvious.
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