Aluminum-containing high Manganese（Mn） steels are widely used as key parts for wear-resistant devices due to their excellent wear resistance, work hardening ability, and low-density characteristics, in order to achieve the lightweight design and industrial energy-saving and consumption reduction. In the present study, a lightweight high Mn steel with a composition of Fe-18Mn-4Al-1. 2C-2Cr（wt. %） is designed by adding the mass fraction of 4% aluminum, and the effect of aging heat treatment on the microstructure, tensile and impact properties of 1 100 ℃ solid soluted steel was studied by optical microscope（OM）, X-ray diffractometer（XRD）, scanning electron microscope（SEM）, hardness test, pendulum impact tests and tensile tests. The results show that the tensile-to-yield stress ratio, hardness and impact energy of the material, after aging between 300 to 500 ℃, increases gradually with the aging temperature. At the same time, the metallographic results show that a large number of carbides were precipitated at the grain boundaries after aging heat treatment at 600 ℃, forming grain boundary brittleness and leading to the deterioration of the mechanical properties of the lightweight high Mn steel, thus elongation and strength of the light-weight wear-resistant steel decreased sharply after aging at 600 ℃.

The Fe-18.4Mn-2.1Cr-1.3C-4Al (wt.%) steel was designed for lightweight application purpose with comprehensive advantages of low density, wear resistance, and high strength. Further exploring of the mechanical properties, especially the yield strength influenced by the aging treatments (300 °C and 500 °C), needs more investigation. The precipitated carbides observations and tensile tests, after specific solution and aging treatments, were carried out to reveal that the Fe(Mn) 3 C carbide precipitation contributed up to 111 MPa strengthening effect on yield strength with 300 °C aging heat treatment. The present study pointed out that tailor-made solution and aging treatments processes to achieving further strength improvement, especially for yield stress.

高锰钢作为耐磨材料,被广泛应用于高载荷或冲击磨损的工况下.轻量化是钢铁材料发展的趋势之一,也是满足工业节能降耗需求的重要途径.为了明确轻质化元素铝对此类钢种的影响,以高锰钢ZGMn18Cr2为基础,通过控制铝含量,得到成分不同的轻质高锰钢.利用金相显微镜(OM)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)及电子探针(EPMA)等手段对其微观组织进行表征,并采用硬度测试、室温冲击和拉伸实验测试了其力学性能.结果表明,随着铝的质量分数在0～11％范围内不断增大,高锰钢的密度得到明显降低,铁素体相逐渐稳定,晶粒得到细化.同时,材料的抗拉强度、屈服强度、伸长率和室温断裂冲击功先升高后下降;硬度则先下降后升高.这些性能的改变与铝含量的变化、第二相铁素体的出现以及含铝碳化物的数量有重要关系.