耐热钢中Laves相抗蠕变机制的分子动力学模拟  

Molecular Dynamics Simulation of Creep Resistance Mechanism of Laves Phases in Heat Resistant Steels

作　　者：王传军 孙旭 刘文月 刘鑫 WANG Chuanjun;SUN Xu;LIU Wenyue;LIU Xin(Ansteel Beijing Research Institute Co.,Ltd.,Beijing 102200,China;Material Digital R and D Center,China Iron and Steel Research Institute Group,Beijing 100081,China)

机构地区：[1]鞍钢集团北京研究院有限公司,北京102209 [2]中国钢研科技集团数字化研发中心,北京100081

出　　处：《鞍钢技术》2024年第6期17-22,共6页Angang Technology

摘　　要：利用弥散分布的Laves相强化的耐热钢通过结合固溶强化相和弥散分布的Laves相的析出强化可提供在高温服役环境下优秀的抗蠕变性能。而弥散分布的Laves相颗粒与基体相、位错、孪晶运动关系等机制尚不完全明确。通过建立含不同直径及直径分布的Laves相的耐热钢模型,对其实施单轴加载,系统研究了不同尺寸分布的Laves相对耐热钢力学性能的影响,得出结论为Laves相直径越小,其力学性能越好,该结论为实际制备高抗蠕变性能的耐热钢提供了理论指导。Heat resistant steels strengthened by dispersed Laves phases can provide excellent creep resistance under high temperature service by combining solid solution strengthening phases with precipitation strengthening of diffusely distributed Laves phases.However,these mechanisms of the relationship among particles of diffusely distributed Laves phases and matrix phases,dislocations and twin movement are not completely clear.By establishing the model for heat resistant steels containing Laves phases with different diameters and different distributions of diameters,and then applying uniaxial loading to this model,the effect of Laves phases with different size distributions on the mechanical properties of heat resistant steels was systematically studied.After study,it was concluded that the smaller the diameters of Laves phases were,the better the mechanical properties were,which provided theoretical guidance for the actual preparation of heat resistant steels with high creep resistance.

关 键 词：耐热钢 LAVES相 孪晶 位错 分子动力学 

分 类 号：TG335[金属学及工艺—金属压力加工] TP3[自动化与计算机技术—计算机科学与技术]