不锈钢表面耦合仿生激光熔覆工艺及性能的研究  

Research on the Process and Pro perties of Stainless Steel Surface Coupled Bionic Laser Cladding

作　　者：姜鹤明 王坤[1] 李勇[1] Jiang Heming;Wang Kun;Li Yong(School of Optoelectronic Manufacturing,Zhejiang Industry and Trade Vocational College,Wenzhou 325037,Zhejiang,China)

机构地区：[1]浙江工贸职业技术学院光电制造学院,浙江温州325037

出　　处：《应用激光》2023年第8期1-9,共9页Applied Laser

基　　金：浙江省教育厅一般项目(Y202045206);温州市科技局重点项目(ZG2020035);杭钢集团科研项目(B23);浙江工贸职业技术学院校级教师创新科研项目(G2102302)。

摘　　要：为进一步改善球阀耐磨性能,利用激光熔覆设备在不锈钢表面构造出仿树叶纹路的生物结构强化层,并对试样的显微组织、表面硬度和耐磨损性能进行测试和分析。结果表明,激光熔覆过程中组织快速冷却、晶粒细化,熔覆层表面硬度得到了较大的提升,试样表面形成了类似树叶中“叶脉”与“叶肉”的耦合仿生强化层。“叶脉”与“叶肉”交错分布,其中硬度较高的为“叶脉”,硬度较低的为“叶肉”。“叶脉”起到骨架的支撑作用,“叶肉”填充骨架之中起到缓冲作用。不同的耦合仿生路径中,激光扫描路径与摩擦磨损方向呈现60°夹角的试样耐磨性最佳。其中斜向的仿生结构有利于释放摩擦副中的周期性应力,减少疲劳磨损的现象,主要磨损机理为少量磨粒磨损和黏着磨损。In order to improve the wear resistance of the ball valve,the laser cladding is used to construct the strengthening layer of the biological structure imitating the leaf pattern on the surface of the stainless steel,and the microstructure,hardness,and wear resistance of the sample are tested and analyzed.The results show that the microstructure is rapidly cooled,the grain is refined during the laser cladding process,and the surface hardness of the cladding layer is greatly improved,forming the"vein"structure in the bionics.However,due to multiple overlapping and secondary scanning,the grains continue to grow and the hardness decreases,forming the"mesophyll"structure in biomimetic.The"vein"and"mesophyll"are staggered,with the higher hardness being"vein"and the lower hardness being"mesophyll"."Leaf vein"plays a supporting role in the skeleton,and"mesophyll"plays a buffering role in filling the skeleton.Among the different coupling bionic paths,the specimen with an angle of 6o°between the laser scanning path and the friction and wear direction has the best wear resistance.The oblique bionic structure is beneficial to release the stress in the friction pair and reduce the fatigue wear phenomenon.The main wear mechanism is a small amount of abrasive wear and adhesive wear.

关 键 词：仿生耦合 激光熔覆 耐磨性 磨损机制 

分 类 号：TG174.4[金属学及工艺—金属表面处理] TG146.16[金属学及工艺—金属学]