摘要
为了提高纸浆阀门的使用寿命,利用高功率半导体激光器在304不锈钢板上熔覆钴基耐磨涂层。研究了激光工艺对熔覆层性能的影响,对不同温度下熔覆层的耐磨性进行了分析,并与传统手工堆焊涂层进行比较。结果表明,稀释率越高,熔覆层硬度越低,当激光功率为2000 W,扫描速度为20 mm/s时,得到的熔覆层成形好、稀释率小。磨损试验结果表明,100℃、200℃时的涂层磨损机理主要为磨粒磨损;300℃、400℃时,发生粘着磨损。由于手工堆焊涂层稀释率高,晶粒粗大,硬度较激光熔覆层低,熔覆层耐磨性优于手工堆焊涂层。
To improve the service life of valves used in pulp industry,Co-based coatings were produced on 304 stainless steel substrate by diode laser cladding. Effect of laser parameters on properties of coating was investigated,and wear resistance of the coating compared with that of the traditional manual surfacing at different temperatures was analyzed. The results show that higher dilution ratio lead to lower hardness and the coating produced with laser power 2000 W and scanning speed 20 mm/s has good morphology and low dilution ratio. Wear tests show that the wear mechanism is abrasiveness at 100 ℃ and 200 ℃,and adhesive wear happen at 300 ℃ and 400 ℃. Besides,the wear resistance of the laser cladded coating is better than that of the manual surfacing coating at all temperatures because of dilution,coarse grain and lower hardness.
出处
《金属热处理》
CAS
CSCD
北大核心
2016年第3期125-130,共6页
Heat Treatment of Metals
基金
国家十二五支撑计划资助项目(2012BAF08B02)
温州市科技局激光与光电产业集群科技专项(J20140005)
关键词
激光熔覆
钴基合金
稀释率
显微硬度
耐磨性能
laser cladding
Co-based alloy
dilution
microhardness
wear resistance
