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研究了1000、1050和1100℃水韧处理后Fe-26Mn-7Al-1.3C耐磨钢的力学性能和微观组织,分析其变形过程中的形变硬化行为,研究其微观变形机理。结果表明,水韧处理有利于组织中的κ系碳化物细化固溶,得到均匀的单相奥氏体组织,提高钢的强度和韧性。1050℃水韧处理后试验钢的综合力学性能最佳,其抗拉强度为723.9 MPa,规定塑性延伸强度为395.5 MPa,断后伸长率为48.8%,冲击吸收能量(V型缺口)为263.9 J。连续的形变硬化行为使得试验钢获得高强度与塑性的良好匹配;变形后奥氏体中可观察到泰勒晶格、高密度位错墙及微带结构,符合平面滑移特征。
The mechanical properties and microstructure of Fe-26Mn-7Al-1.3C wear-resistant steels treated with water-toughening at 1000, 1050 and 1100 ℃ were studied. The deformation and hardening behavior of Fe-26Mn-7Al-1.3C wear- The results show that water toughening treatment is beneficial to the refinement and dissolution of κ carbides in the microstructure, to obtain homogeneous single-phase austenite structure and to improve the strength and toughness of the steel. The mechanical properties of the test steel after 1050 ℃ water toughening are the best, the tensile strength is 723.9 MPa, the plastic extension strength is 395.5 MPa, the breaking elongation is 48.8% and the impact absorption energy (V-notch) is 263.9 J . The continuous deformation hardening results in a good match between high strength and plasticity of the test steel. The Taylor lattice, the high density dislocation wall and the microstrip structure can be observed in the deformed austenite, which is consistent with the plane slip characteristics.