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目前制约激光表面熔覆层技术广泛应用的主要技术因素是激光熔覆层的开裂。选用5kW横流CWCO2激光器,以熔覆CoNiCrWC复合涂层为研究对象,考虑熔覆层厚度、基材预热温度对熔覆层开裂行为的影响,并通过自制的微锻造机构,在激光熔覆的同时进行高频微锻造作用熔覆层,使激光熔覆表面合金层产生塑性变形,激光熔覆层特有的明显而规则枝状结晶组织被锻碎,激光熔覆层的开裂行为明显好转。从熔覆层厚度、基材预热温度和高频微锻造作用熔覆层这3个方面阐述调控激光熔覆层裂纹的最佳实验方法。
At present, the main technical factor that restricts the widely used laser surface cladding technology is the cracking of the laser cladding layer. The cross-flow CWCO2 laser with 5kW is chosen to study the effect of cladding thickness and substrate preheating temperature on the cracking behavior of CoLiCrWC coating. The self-made micro- At the same time, high frequency micro-forging is used to make the cladding layer to plastic deformation the laser cladding surface alloy layer. The obvious and regular dendritic crystalline structure peculiar to the laser cladding layer is crushed, and the cracking behavior of the laser cladding layer is obviously improved. The best experimental method for controlling the crack in laser cladding layer is described from the aspects of cladding thickness, substrate preheating temperature and high frequency micro-forging.