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| Effect of Copper Content on Microstructure and Mechanical Properties of High Carbon TWIP Steels |
| YI Wei-fa,ZHU Ding-yi,YANG Ze-bin,LIN Shu-mei |
| School of Materials Science and Engineering， Fuzhou University, Fuzhou 350108, Fujian, China |
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Abstract Three new high-strength and high-plasticity Fe-20Mn-XCu-1.3C steels with different copper content were prepared by vacuum melting. The effects of copper content on the microstructures of such steels and deformed ones were observed by OM, and effects on mechanical properties were investigated by unidirectional tensile. The experimental results indicate that the undeformed and deformed microstructures of Fe-20Mn-XCu-1.3C steels are single austenitic phase. The yield strength and elongation increases with the increasing of copper content, while the tensile strength decreases with it. Fe-20Mn-3.0Cu-1.3C has a comprehensive property which the tensile strength is 1256MPa, the elongation percentage is 77.6% and the strength-plasticity product achieves 97465.6MPa·%. As the increasing copper content, the stacking fault energy value of these steels was found to be increased, so the formation of deformation twin were delayed and its volume fraction increasing rate was also decreased during tensile deformation, but the dislocation glide were strongly activated. Fe-20Mn-XCu-1.3C steels had high work hardening rate, and the hardening rate decreased with the increasing of copper content.
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Received: 02 September 2010
Published: 17 November 2011
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2011, Vol. 46 
