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    王天成, 王祎雪, 李九霄, 张宇航, 王颉闻, 唐丽娜. 38CrMoAl钢表面渗氮与激光淬火复合改性层的组织和性能及厚度预测[J]. 机械工程材料, 2024, 48(9): 96-103. DOI: 10.11973/jxgccl210710
    引用本文: 王天成, 王祎雪, 李九霄, 张宇航, 王颉闻, 唐丽娜. 38CrMoAl钢表面渗氮与激光淬火复合改性层的组织和性能及厚度预测[J]. 机械工程材料, 2024, 48(9): 96-103. DOI: 10.11973/jxgccl210710
    WANG Tiancheng, WANG Yixue, LI Jiuxiao, ZHANG Yuhang, WANG Jiewen, TANG Lina. Microstructure and Properties of Nitriding and Laser Quenching Composite Modified Layer on 38CrMoAl Steel Surface and Its Thickness Prediction[J]. Materials and Mechanical Engineering, 2024, 48(9): 96-103. DOI: 10.11973/jxgccl210710
    Citation: WANG Tiancheng, WANG Yixue, LI Jiuxiao, ZHANG Yuhang, WANG Jiewen, TANG Lina. Microstructure and Properties of Nitriding and Laser Quenching Composite Modified Layer on 38CrMoAl Steel Surface and Its Thickness Prediction[J]. Materials and Mechanical Engineering, 2024, 48(9): 96-103. DOI: 10.11973/jxgccl210710

    38CrMoAl钢表面渗氮与激光淬火复合改性层的组织和性能及厚度预测

    Microstructure and Properties of Nitriding and Laser Quenching Composite Modified Layer on 38CrMoAl Steel Surface and Its Thickness Prediction

    • 摘要: 对38CrMoAl钢进行460 ℃渗氮8,16 h与激光淬火处理,研究了复合改性层的组织和性能;利用Matlab软件与Abaqus有限元软件对复合改性层的氮浓度分布场和激光淬火温度场进行数值模拟,预测不同工艺下复合改性层的厚度,并进行试验验证。结果表明:复合改性层表面组织为含过饱和氮的马氏体,次表面为淬火马氏体,同时复合改性层中还存在铁的氧化物(Fe3O4,FeO,Fe2O3)和铁的氮化物(ε-Fe2-3N、γ'-Fe4N)组成,且16 h渗氮+激光淬火得到氮化物的含量更多。不同工艺处理后复合改性层截面硬度分布曲线中存在平台区,16 h渗氮+激光淬火后复合改性层平台区的硬度为720 HV,比8 h渗氮+激光淬火的复合改性层高约100 HV;8,16 h渗氮+激光淬火后复合改性层的厚度分别为530, 590 μm。与8 h渗氮+激光淬火相比,16 h渗氮+激光淬火后复合改性层的稳定摩擦因数和磨损体积均较低,分别为0.293,1.012 mm3,耐磨性能较优。预测得到8,16 h渗氮+激光淬火后复合改性层的厚度分别为531,583 μm,相对误差小于3%,验证了预测方法的有效性。

       

      Abstract: 38CrMoAl steel was nitrided at 460 ℃ for 8 or 16 h and then laser quenched. The microstructure and properties of composite modified layer were studied. The nitrogen concentration distribution field and laser quenching temperature field of the composite modified layer were simulated by Matlab software and Abaqus finite element software, respectively. The thickness of the composite modified layer under different processes was predicted, and was verified by tests. The results show that the surface structure of the composite modified layer was composed of martensite containing susaturated nitrogen, and the subsurface consisted of quenched martensite. At the same time, there were iron oxides (Fe3O4, FeO, Fe2O3) and iron nitrides (ε-Fe2-3N, γ´-Fe4N) in the composite modified layer, and the content of nitrides under 16 h nitriding and laser quenching was more. There were platform zones in the section hardness distribution curves of composite modified layers under different processes. The hardness of the platform zone of the composite modified layer after 16 h nitriding and laser quenching was 720 HV, which was about 100 HV higher than that of the composite modified layer after 8 h nitriding and laser quenching. The thicknesses of the composite modified layer after 8, 16 h nitriding and laser quenching were 530, 590 μm, respectively. Compared with those after 8 h nitriding and laser quenching, the stable friction coefficient and wear volume of the composite modified layer after 16 h nitriding and laser quenching were lower, which were 0.293 and 1.012 mm3, respectively, and the wear resistance was better. The predicted thicknesses of the composite modified layer after 8,16 h nitriding and laser quenching were 531, 583 μm, respectively, and the relative error was less than 3%, which verified the effectiveness of the prediction method.

       

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