扫描速度对风电机组用316L不锈钢熔凝层组织及性能的影响  

Effect of Scanning Speed on Microstructure and Wear Resistance of Laser Melting 316LStainless Steel

作　　者：赵群 赵晋芳 朱爽 王琳 Zhao Qun;Zhao Jinfang;Zhu Shuang;Wang Lin(School of Mechanical Engineering,Shenyang Institute of Engineering,Shenyang110136,Liaoning,China;School of Civil Aviation,Shenyang Aerospace University,Shenyang110136,Liaoning,China)

机构地区：[1]沈阳工程学院机械学院,辽宁沈阳110136 [2]沈阳航空航天大学民航学院,辽宁沈阳110136

出　　处：《应用激光》2024年第4期21-27,共7页Applied Laser

基　　金：国家自然科学基金(62001312);辽宁省教育厅科学研究经费项目(LJKZ1093,JYT2020122)。

摘　　要：为提高风电机组用316L不锈钢的表面硬度及耐磨性,采用激光熔凝技术对其表面进行强化处理。分别选用1 100 mm/min、1 300 mm/min、1 500 mm/min的扫描速度制备316L激光熔凝层,系统研究不同激光扫描速度对熔凝层组织、相组成、硬度及耐磨性能的影响。结果表明,316L激光熔凝层均匀致密,熔凝层无气孔、裂纹等缺陷。随着扫描速度的加快,熔凝层晶粒尺寸逐渐减小。1 500 mm/min制备的熔凝层显微硬度最高,约为(253±9.8) HV,显微硬度的提高可归因于固溶强化和细晶强化的协同作用;1 500 mm/min制备的激光熔凝层的耐磨性最好,摩擦系数和磨损率最低,分别为0.56和2.46×10^(6)μm^(3)/(N·m)。磨损机理为黏着磨损和磨粒磨损。激光熔凝可有效提升316L不锈钢的硬度和耐磨性。In order to improve the surface hardness and wear resistance of 316Lstainless steel,laser melting technology were used to strengthen the surface of 316Lsteel.The scanning speed of 1100mm/min,1300mm/min and 1500mm/min were selected to prepare the 316Llaser melting layer.The effects of different laser scanning speeds on the microstructure,phase composition,hardness,and wear resistance of the molten layer were studied.The results showed that the 316Llaser melting layer was uniform and dense,and the molten layer had no pores,cracks,and other defects.As the scanning speed increased,the grain size of the molten layer gradually decreased.The microhardness of the molten layer prepared at 1500mm/min was the highest,about(253±9.8)HV,and the increased in microhardness could be attributed to the synergistic effect of solution strengthening and fine grain strengthening.The laser molten layer prepared at 1500mm/min had the best wear resistance,and the friction coefficient and wear rate were the lowest,which were 0.56and 2.46×10^(6)μm^(3)/(N·m),respectively.The wear mechanism was adhesion wear and abrasive wear.Laser melting treatment on the surface of 316Lstainless steel can effectively improve its hardness and wear resistance.

关 键 词：激光熔凝 316L不锈钢 显微硬度 耐磨性 

分 类 号：O436[机械工程—光学工程]