摘要
为改善304不锈钢的表面性能,采用激光合金化技术在304不锈钢表面制备不同工艺参数Ta基合金化层,利用X射线衍射仪和扫描电镜分析并观察合金化层成分和形貌,利用显微硬度仪测试合金化层的硬度和摩擦磨损试验机测试合金化层的耐磨损性能,利用电化学工作站研究试样在3.5%的NaCl溶液中的耐腐蚀性。研究表明,在激光功率900 W,激光扫描速率1.5 mm/s时,制备的合金化层更为均匀、致密,合金化层的主要成分是TaC;3#试样的硬度平均值达到1113.52 HV,是基体0#试样的3.27倍;2#摩擦因数为0.45,比不锈钢减小了25%;3#试样的耐腐蚀性更好,基体试样0#的腐蚀电位Ecorr=-0.98 V,腐蚀电流密度Jcorr=4.57×10^(-5) A·cm^(-2),与基体试样0#相比,3#试样的腐蚀电位(-0.36 V)明显增大,腐蚀电流密度(2.81×10^(-7) A·cm^(-2))明显减小。在304不锈钢表面制备合金化层能充分改善其硬度、耐磨性、耐腐蚀性等性能,拓宽了304不锈钢的应用领域。
In order to improve the surface properties of 304 stainless steel,laser alloying technology is used to prepare Ta-based alloyed layers with different process parameters on the surface of 304 stainless steel.X-ray diffractometer and scanning electron microscope are used to analyze and observe the composition and morphology of the alloyed layers.The hardness tester is used to test the hardness of the alloyed layer.The friction and wear tester is used to test the wear resistance of the alloyed layer.The electrochemical workstation is used to study the corrosion resistance of the sample in 3.5%NaCl solution.The results show that when the laser power is 900 W and the laser scanning rate is 1.5 mm/s,the prepared alloyed layer is more uniform and dense,and the main component of the alloyed layer is TaC.the average hardness of the 3#sample reaches 1113.52 HV,which is 3.27 times that of base 0#sample.2#sample has a friction factor of 0.45,which is 25%less than stainless steel;3#sample has better corrosion resistance,the corrosion potential of base sample 0#Ecorr=-0.98 V,and the corrosion current density Jcorr=4.57×10^(-5) A·cm^(-2).Compared with the matrix sample 0#,the corrosion potential(-0.36 V)of the 3#sample is significantly increased,and the corrosion current density(2.81×10^(-7) A·cm^(-2))is significantly reduced.The alloyed layer prepared on the surface of 304 stainless steel can fully improve its hardness,wear resistance,corrosion resistance,and other properties,which broadens the application field of 304 stainless steel.
作者
李育
贺利乐
Li Yu;He Lile(School of Railway Equipment Manufacturing,Shaanri Railway Institute,Weinan Shaanxi 714000,China;School of Mechanical and Electrical Engineering,Xi'an University of Architecture and Technology,Xi'an Shaanxi 710055,China)
出处
《应用激光》
CSCD
北大核心
2022年第9期89-96,共8页
Applied Laser
基金
陕西省自然科学基础研究计划项目(2019JQ-891)
陕西省教育厅项目(20JS133)
陕铁院校级自然科学基金资助项目(KY2022-26)。
关键词
304不锈钢
合金化层
硬度
耐磨性
耐腐蚀性
304 stainless steel
alloyed layer
hardness
wear resistance
corrosion resistance
