论文部分内容阅读
研究了经650、950℃扩散退火5 h后的热浸镀铝钢,在环境温度400℃、不同载荷作用下的磨损行为,并探讨了其磨损机理。结果表明,经650℃扩散退火处理的热浸镀铝钢的镀层主要由脆性相Fe_2Al_5组成;其磨损率随载荷的增大而增大,主要磨损机制为氧化磨损和剥落磨损。经950℃扩散退火处理后的镀层均由韧性相FeAl和Fe_3Al构成;当载荷低于200 N时,其磨损率几乎不随载荷变化,且保持在很低的水平;其优异的耐磨性源于磨面处形成了厚1~2μm、含大量Al2O3和Fe2O3及少量W、Mo的氧化物的摩擦氧化层,主要磨损机制为氧化轻微磨损。当载荷增加至250 N时,45钢基体发生热软化,摩擦层不稳定而剥落,基体发生塑性挤出。
The wear behaviors of hot-dip aluminized steel after being annealed at 650,950 ℃ for 5 h were studied under the condition of ambient temperature of 400 ℃ and different loads. The wear mechanism was also discussed. The results show that the coating of hot-dip aluminized steel with 650 ℃ diffusion annealing mainly consists of brittle phase Fe_2Al_5. The wear rate increases with the increase of load. The main wear mechanisms are oxidation wear and exfoliation wear. The coatings annealed at 950 ℃ consist of ductile FeAl and Fe 3 Al. When the load is less than 200 N, the wear rate hardly changes with the load and remains at a very low level. The excellent wear resistance results from A 1 ~ 2μm thick friction oxide layer with a large amount of Al2O3 and Fe2O3 and a small amount of W and Mo oxides was formed on the grinding surface. The main wear mechanism was slight oxidation wear. When the load increases to 250 N, 45 steel matrix heat softening, friction layer instability and spalling, the matrix plastic extrusion.