摘要
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 key technical factors that limit wider application of the surface laser cladding layer technology is the cracking of laser cladding layer. CoNiCrWC composite coatings produced by 5 kW cross-flow CW CO2 laser was researched. The influence of both thickness of cladding layer and the preheat temperature of substrate on the cladding layer cracking behavior were considered. Using self-made micro-forging mechanism, high-frequency micro-forging was carried out on the laser cladding as laser cladding process went on simultaneously, which made plastic deformation emerge on the surface alloy laser cladding layer, and laser cladding’s specific clear and regular dendritic crystal structure forge into pieces, and finally the cracking behavior of laser cladding layer is significantly improved. This paper stated the best experimental methods of regulating the cracks on laser cladding layer from such three aspects as the cladding layer thickness, the substrate preheat temperature and high-frequency micro-forging process.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2011年第S2期283-285,共3页
Rare Metal Materials and Engineering
基金
国家自然科学基金资助项目(50775106
50974075)
关键词
激光熔覆
裂纹
微锻造
laser cladding
crack
micro-forging
