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

作　　者：王天成 王祎雪 李九霄 张宇航 王颉闻 唐丽娜 WANG Tiancheng;WANG Yixue;LI Jiuxiao;ZHANG Yuhang;WANG Jiewen;TANG Lina(School of Materials Science and Engineering,Shanghai University of Engineering Science,Shanghai 201620,China;Shanghai Aerospace Equipments Manufacturer Co.,Ltd.,Shanghai 201100,China)

机构地区：[1]上海工程技术大学材料科学与工程学院,上海201620 [2]上海航天设备制造总厂有限公司,上海201100

出　　处：《机械工程材料》2024年第9期96-103,共8页Materials For Mechanical Engineering

摘　　要：对38CrMoAl钢进行460℃渗氮8,16h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(Fe_(3)O_(4),FeO,Fe_(2)O_(3))和铁的氮化物(ε-Fe_(2-3)N、γ'-Fe_(4)N)组成,且16h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,16h渗氮+激光淬火后复合改性层平台区的硬度为720HV,比8h渗氮+激光淬火的复合改性层高约100HV;8,16h渗氮+激光淬火后复合改性层的厚度分别为530,590μm。与8h渗氮+激光淬火相比,16h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0.293,1.012mm^(3),耐磨性能较优。预测得到8,16h渗氮+激光淬火后复合改性层的厚度分别为531,583μm,相对误差小于3%,验证了预测方法的有效性。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(Fe_(3)O_(4),FeO,Fe_(2)O_(3))and iron nitrides(ε-Fe_(2-3)N,γ'-Fe_(4)N)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 530,590μm,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 mm^(3),respectively,and the wear resistance was better.The predicted thicknesses of the composite modified layer after 8,16 h nitriding and laser quenching were 531,583μm,respectively,and the relative error was less than 3%,which verified the effectiveness of the prediction method.

关 键 词：38CRMOAL钢 离子渗氮 激光淬火 硬度 耐磨性能 改性层厚度 

分 类 号：TG161[金属学及工艺—热处理]