摘要
在本实验条件下,发现随着润滑油中十八胺含量的增加,润滑油的抗接触疲劳能力提高。对试件表面化学元素进行了微成分分析,认为试件表面的N元素是FeN形式。十八胺能提高接触疲劳寿命的原因,是它能减少摩擦面间的摩擦系数,其胺基呈碱性。可中和润滑油中的部分酸性或减弱极性物质对金属的腐蚀作用。在扫描电镜上对试件表面疲劳裂纹的扩展进行了观察,认为疲劳点蚀的裂纹源来自试件表面,裂纹沿最大剪应力方向扩展,扩展中“油封”起重要作用。
It is found that under the certain conditions the resistance to contact fatigueincreases with the octadecylamine content in lubricant oil.The microanalysis ofchemical composition made on the specimen surface indicates that the elementN takes a form of FeN. The reason why octadecylamine can prolong the life-time of contact fatigue is that it will reduce the friction coefficient and itsamino basicity can neutralize partly the acidity in lubricant oil or inhibitmetal's corrosion due to extreme substances. The propagation of fatigue cra-cks on specimen surface was observed by SEM, and the crack origin of pitingcorrosion due to fatigue is thus regarded as arising from the specimen surface.Such cracks propagate in the direction of maximum sheaving stress, and the'Fluid Entrapment' plays an important role during crack propagation.
关键词
十八胺
润滑油
接触疲劳
octadecylamine
lubricant oil
contact fatigue
