采用真空熔炼法制备了Fe-20Mn-XCu-1.3C系高强度高塑性合金钢。通过单向拉伸试验和OM观察,研究了铜含量的变化对该合金微观组织和力学性能的影响。结果表明：Fe-20Mn-XCu-1.3C系合金拉伸变形前后均为单相奥氏体组织。随着铜含量的增加,合金的屈服强度和伸长率提高,而抗拉强度降低,Fe-20Mn-3.0Cu-1.3C合金的抗拉强度为1256MPa,伸长率为77.6%,强塑积达到97465.6MPa.%,具有优异的综合力学性能。铜含量的增加提高合金的层错能,推迟了变形过程中孪晶的形成并降低了孪晶的形成速率,使位错滑移更容易发生。Fe-20Mn-XCu-1.2C系合金具有较高的加工硬化速率水平,其加工硬化速率随着铜含量的增加而降低。
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 1 256 MPa,the elongation percentage is 77.6% and the strength-plasticity product achieves 97 465.6 MPa·%.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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