旋耕刀表面激光强化工艺参数的研究  

Study on Processing Parameters of Laser Strengthening on Farm Tools Steel Surface

作　　者：陈卓君[1,2] 张祖立[2] 李柏姝[1] 卢秉福[2] 杨玉芬[2] 

机构地区：[1]沈阳理工大学汽车与交通学院,辽宁沈阳110168 [2]沈阳农业大学农业工程学院,辽宁沈阳110161

出　　处：《润滑与密封》2009年第1期63-66,共4页Lubrication Engineering

基　　金：沈阳市科技局资助项目(06356)

摘　　要：通过设计正交实验,考察了激光强化工艺参数对65Mn旋耕刀基体显微硬度的影响,通过极差分析,发现影响旋耕刀基体激光强化效果的最主要因素是扫描速度,其次是激光功率,而光斑直径影响最小,由此获得65Mn旋耕刀基体激光强化处理的最佳工艺参数为:激光功率1 400 W、扫描速度22 mm/s、光斑直径3 mm。结合基体显微组织分析,讨论了激光表面熔融强化机制。材料经激光表面熔融强化后,基体组织明显细化,并在强化区形成许多较细小高碳马氏体,导致显微硬度上升,从而提高材料的抗磨损性能。Effects of laser strengthening process parameters on mierohardness of 65 Mn rotary tools matrix were investigated by orthogonalized experiments. The results reveal the laser scanning velocity is the most dominating factor influencing the strengthening effect, then the power, and the last the facular diameter. The optimal parameters for laser strengthening are 1400 W laser power,22mm/s scanning velocity, and 3 mm facualr diameter. Based on the analysis of microstructures, the laser strengthening mechanism was discussed. After strengthened by laser, the matrix microstructure of materials is refined, many of the smaller high-carbon martensite is formed in solidified area,which increases the wear resistance.

关 键 词：激光强化 65MN钢 显微硬度 显微组织 

分 类 号：TH117.1[机械工程—机械设计及理论]