碳钢表面碳—氮共渗层在高速干摩擦条件下的摩擦学性能研究

对 2 0 # 钢试样进行碳 -氮共渗热处理 ,考察了共渗层在高速干摩擦条件下的摩擦学性能 ,并用扫描电子显微镜和X射线光电子能谱仪对其磨损表面形貌和元素化学状态进行了分析 .结果表明 :随着滑动速度的增加 ,2 0 # 钢表面碳 -氮共渗层的磨损率逐渐降低 ,当滑动速度达到 35m/s左右时 ,磨损率显著增大 .扫描电子显微镜和X射线光电子能谱分析结果表明 ,高速轻载干摩擦条件下 2 0 # 钢表面碳 -氮共渗层的摩擦学性能同磨损表面氧化物的形成和剥落密切相关 ,而磨损率的显著增加是由于磨损表面氧化物类型发生从Fe2 O3 到FeO的转变所致 .

Friction and Wear Behavior of Carbon/nitrogen Co-permeated Layer on Mild Steel in Dry Sliding against a Bearing Steel at an Extremely High Speed

AISI 1020 steel was co-permeated with carbon and nitrogen. The friction and wear behavior of the co-permeated surface-modified layer in dry sliding against AISI-C-52100 steel at extremely high speed from 25m/s to 35m/s and under relatively low loads from 2N to 6N was examined on a pin-on-disc test rig. The morphologies of the worn surface and the wear mechanism of the surface-modified layer were observed and analyzed by means of scanning electron microscopy and X-ray photoelectron spectroscopy. The results show that the wear rate of the surface-modified layer decreases greatly with the increase of the sliding speed when the sliding speed is below 35m/s, then the wear rate assumes a considerable increase with increasing sliding speed. The variation of the wear rate with the sliding speed is closely related to the generation and spalling of the oxide film on the worn surface. Namely, the oxide film is composed of Fe 2O 3 at a relatively smaller sliding speed but of FeO at a larger sliding speed.