Effect of rolling and annealing process on tensile deformation behavior of high carbon content twin-induced plasticity steel
Taking Fe-18Mn-1.0C high carbon content TWIP steel as the research object,the effects of cold rolling reduction and annea-ling temperature on tensile deformation behavior of high carbon TWIP steel were studied by uniaxial tensile tests,optical microscope(OM)and scanning electron microscope(SEM).The results show that with the increase of the rolling reduction,a large number of de-formed structures are produced in the test steel.The yield strength and tensile strength increase obviously,whereas the plasticity decreases under the effect of rolling deformed structure.The dynamic strain aging(DSA)phenomenon occurs during the tensile process of the cold rolling high carbon TWIP steel.With the increase of rolling reduction,the amplitude and number of serrations decrease,and the DSA phenomenon is suppressed.The samples with cold rolling reduction of 40%were annealed at different temperatures,and it is found that with the increase of annealing temperature,the yield strength of sample decreases,the tensile strength decreases obviously when the an-nealing temperature is over 400℃,and the elongation increases first and then decreases.Carbide precipitation is the main reason for the decrease of tensile strength and elongation of high carbon TWIP steel when the annealing temperature exceeds 400℃.
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