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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。
Under this experimental condition, it was found that as the amount of octadecylamine in the lubricating oil increases, the contact fatigue resistance of the lubricating oil increases. Micro-component analysis of the chemical elements on the surface of the test piece shows that the N element on the surface of the test piece is FeN. Octadecyl amine can improve the contact fatigue life of the reason is that it can reduce the friction coefficient between the friction surface, the amine base is alkaline. Can neutralize part of the acidity of the lubricant or reduce the corrosive effect of polar substances on the metal. The extension of the fatigue crack on the surface of the specimen was observed by SEM. The source of fatigue pitting corrosion originated from the specimen surface. The crack propagated along the direction of the maximum shear stress.