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 316L Stainless Steel
赵群 1赵晋芳 2朱爽 1王琳1
作者信息
- 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
- 折叠
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× 106 μm3/(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.
Abstract
In order to improve the surface hardness and wear resistance of 316L stainless steel,laser melting technology were used to strengthen the surface of 316L steel.The scanning speed of 1 100 mm/min,1 300 mm/min and 1 500 mm/min were se-lected to prepare the 316L laser melting layer.The effects of different laser scanning speeds on the microstructure,phase com-position,hardness,and wear resistance of the molten layer were studied.The results showed that the 316L laser 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 1 500 mm/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 1 500 mm/min had the best wear resistance,and the friction coefficient and wear rate were the lowest,which were 0.56 and 2.46× 106 μm3/(N·m),respectively.The wear mechanism was adhesion wear and abrasive wear.Laser melting treatment on the surface of 316L stainless 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Key words
laser melting/316L stainless steel/microhardness/wear引用本文复制引用
基金项目
国家自然科学基金(62001312)
辽宁省教育厅科学研究经费项目(LJKZ1093)
辽宁省教育厅科学研究经费项目(JYT2020122)
出版年
2024
NETL
NSTL
万方数据