碳钢表面渗硼层在油润滑条件下的摩擦磨损性能研究

Friction and Wear Behavior of Boron Permeated Layer on Mild Carbon Steel under Oil-lubricated Condition

采用化学热处理工艺对 45 # 钢进行渗硼表面改性 .在 SRV摩擦磨损试验机上对比考察了渗硼层在液体石蜡及含硼添加剂 -液体石蜡润滑下的摩擦磨损性能 .采用 X射线光电子能谱仪和 X射线衍射仪对比分析了 45 #钢表面硼改性层和含硼添加剂润滑下钢球磨斑表面典型元素组成和化学状态 .结果表明 ,化学渗硼可以大幅度降低碳钢的摩擦系数和磨损体积损失 ,渗硼层主要由 Fe2 B和 B2 O3 组成 ;渗硼改性层在含硼添加剂 /液体石蜡润滑下的摩擦磨损性能进一步改善 。

AISI-1045 steel was modified by means of chemical boron permeation. The friction and wear behavior of the boron permeated carbon steel under the lubrication of liquid paraffin containing additive was investigated with an SRV test rig. The microstructure and chemical composition of the boron permeated layer and of the worn steel surface were analyzed by means of X-ray diffraction and X-ray photoelectron spectrometry. As the results, boron-permeation contributed to improve the friction and wear behavior of the steel greatly, and the friction and wear behavior was further improved under the lubrication of liquid paraffin containing boron-doped oleo-glyceride. This was attributed to the combined function of both the boron permeation modification and the tribochemical action of the B-containing organic additive. The surface-modified layer was mainly composed of B2O3 and Fe2B which were beneficial to improving the friction and wear behavior. A boundary lubricating film composed of B2O3 helped to further improve the antiwear and load-carrying properties of the surface-modified steel.