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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。
In order to improve the service life of the pulp valve, a cobalt-based wear-resistant coating was deposited on a 304 stainless steel plate using a high power semiconductor laser. The effect of laser process on the properties of the cladding layer was studied. The wear resistance of the cladding layer at different temperatures was analyzed and compared with that of the traditional hand-over cladding layer. The results show that the higher the dilution rate, the lower the hardness of the cladding layer. When the laser power is 2000 W and the scanning speed is 20 mm / s, the obtained cladding layer is formed well and the dilution rate is small. The results of wear test show that the main wear mechanism of the coatings at 100 ℃ and 200 ℃ is abrasive wear, and adhesive wear occurs at 300 ℃ and 400 ℃. Due to the high dilution rate of hand-built surfacing coating, coarse grains and lower hardness than the laser cladding layer, the wear resistance of the cladding layer is better than that of the hand-built surfacing coating.