The effect of alloying elements on mechanical behavior of Fe-Mn-C TWIP steels was investigated by thermodynamic calculation, static tensile test, XRD, OM and SEM. Results indicate that with manganese content increasing, the yield strength and tensile strength of TWIP steels decrease, while the total elongation varies oppositely. As carbon content increases, the yield strength and tensile strength increase initially and then decline with the maximum located near 0.6%(mass fraction) carbon. When Mn is at 20%, the elongation of TWIP steel increases with carbon content increasing, but exhibits reversed trend in the steels with 22% manganese. The product of tensile strength and elongation increases with manganese content increasing, and it is more obvious in the TWIP steels with 0.4% carbon. As the manganese content is equal to 20%, the product of tensile strength and elongation increases with carbon content increasing. However, for the specimens alloyed with 22% manganese, the product of tensile strength and elongation decreases with carbon content increasing.
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