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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。
Fe-20Mn-XCu-1.3C high strength and high plasticity steel was prepared by vacuum melting method. Through the uniaxial tensile test and OM observation, the effect of copper content on the microstructure and mechanical properties of the alloy was studied. The results show that the Fe-20Mn-XCu-1.3C alloys are single-phase austenite before and after tensile deformation. With the increase of copper content, the yield strength and elongation of the alloy increased, while the tensile strength decreased, the tensile strength of Fe-20Mn-3.0Cu-1.3C alloy was 1256MPa, the elongation was 77.6% 97465.6MPa.%, Has excellent mechanical properties. The increase of copper content improves the stacking fault energy of alloy, defers the formation of twins during the deformation process and reduces the rate of twin formation, which makes dislocation slip easier. Fe-20Mn-XCu-1.2C alloy has a higher level of work-hardening rate, the work hardening rate decreases with the increase of copper content.