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利用单轴拉伸实验研究了应力三轴度对M54钢力学性能的影响规律。结果表明，M54钢的超高强度和良好韧性归因于其高位错密度的细小板条马氏体结构、均匀分布的纳米级M_2C碳化物、超高的马氏体含量、无元素偏析、极薄的逆转变奥氏体层、纳米MC碳化物和众多的板条马氏体取向。另外，随着缺口半径R的减小，M54钢的抗拉强度逐渐升高，表现出典型的缺口强化效应；缺口半径R=2 mm时，抗拉强度可达2.57 GPa。分析表明，缺口强化效应主要由应力三轴度变化引起，应力三轴度越大，强化效果越显著。获得的实验结果和断裂失效参数有助于理解M54钢在不同应力状态下的断裂失效机制。
Abstract：The uniaxial tensile experiments were conducted to investigate the effect of stress triaxiality on the mechanical properties of M54 steel. The results show that the ultra-high strength and good toughness of M54 steel are ascribed to its fine lath martensite structure with high density dislocations, uniform distributed nano-scaled M_2C carbides, ultra-high martensite content, no element segregation, the extremely thin reverted austenite layer, nano MC carbides and many orientations of lath martensite. Additionally, with the decrease of the notch radius R, the tensile strength of M54 steel gradually increases, showing a typical notch strengthening effect. The tensile strength of M54 steel with notch radius R=2 mm can reach 2.57 GPa. It is concluded that the notch strengthening effect is ascribed to the change of stress triaxiality. The larger the stress triaxiality, the more significant the strengthening effect. The obtained experiment results and fracture failure parameters are useful for understanding the fracture failure mechanisms of M54 steel under different stress states.
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基本信息:
中图分类号:TG142.1
引用信息:
[1]李先雨,赵文桥,高涛莉,等.M54钢的力学性能及强韧化机理研究[J].塑性工程学报,2026,33(08):248-258.
基金信息:
国家自然科学基金资助项目(52061038); 陕西省自然科学基金资助项目(2024JC-YBMS-363); 重庆自然科学基金资助项目(cstc2021jcyj-msxmX0589); 延安大学博士科研启动项目(YDBK2023-24); 陕西省教育厅自然科学专项(21JK0985)
2026-08-21
2026-08-21
2026-08-21