摘要
为了提升平滑靴的使用寿命,采用长边单向、短边单向、长边双向和短边双向4种扫描方式在平滑靴基体上制备40CrNi2Si2MoVA涂层,研究其宏观形貌、微观组织、硬度、耐磨性,并通过现场上机实验对不同涂层的平滑靴综合使用寿命进行评估。结果表明:4种扫描方法制备的熔覆层与基体均有良好的冶金结合,表面无比较明显的气孔以及裂纹;熔覆层微观组织主要由胞状晶、树枝晶、柱状晶、等轴晶组成;采用长边单向扫描时,熔覆层的晶粒更加致密,质量最好,采用单向扫描时熔覆层的显微硬度高于双向扫描时的显微硬度,采用短边单向扫描时熔覆层耐磨性有着很明显的优势。上机实验表明,40CrNi2Si2MoVA涂层对平滑靴的使用寿命有着很大的提升。
In order to improve the service life of the smoothing boots, 40 CrNi2 Si2 MoVA coatings were prepared on the substrate of the smoothing boots by four scanning methods, long side unidirectional, short side unidirectional, long side bi-directional, and short side bi-directional.The macroscopic morphology, microstructure, hardness and wear resistance of the coatings were studied, and the comprehensive service life of the smoothing boots with different coatings was evaluated by on-machine experiments.The results show that the clad layers by four scanning methods have good metallurgical bonding with the substrate, and there are no obvious pores and cracks on the surface.The microstructure of the clad layer mainly consists of cellular crystals, dendrites, columnar crystals and equiaxed crystals.When using the long-sided unidirectional scanning mode, the clad layer has a finer and denser grain size and the best quality organization.The microhardness of the clad layer by unidirectional scanning method is higher than that by bidirectional scanning method.The wear resistance of the clad layer by short-sided unidirectional scanning method has obvious advantages.The experiments on the machine show that the 40 CrNi2 Si2 MoVA coating has a great improvement on the service life of the smoothing boots.
作者
杨树
郝敬宾
王瑞明
杨海峰
刘昊
刘新华
YANG Shu;HAO Jingbin;WANG Ruiming;YANG Haifeng;LIU Hao;LIU Xinhua(School of Mechanical and Electrical Engineering,China University of Mining and Technology,Xuzhou Jiangsu 221116,China;TZ Coal Machinery Co.,Ltd.,Taiyuan Shanxi 030032,China)
出处
《润滑与密封》
CAS
CSCD
北大核心
2022年第11期135-141,共7页
Lubrication Engineering
基金
国家自然科学基金项目(51905534,52275224)
中国矿业大学重大项目培育专项(2020ZDPYMS22)
江苏高校优势学科建设工程项目(PAPD)。
关键词
激光熔覆
扫描路径
硬度
微观组织
摩擦磨损性能
laser cladding
scanning path
hardness
microstructure
friction and wear properties
