Study of the Lubrication Mechanism of Thin Film Lubricated Concentrated Steel Contacts. The Influence of Pre-Treatment of the Steel on the Load Carrying Capacity.
Final technical rept. Apr 82-Sep 83,
METAALINSTITUUT TNO APELDOORN (NETHERLANDS) DEPT OF SURFACE TREATMENT AND TRIBOLOGY
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The effect of the thermochemical surface treatments carburizing, ion-nitriding and liquid-nitriding on the load carrying capacity at high speed 4 ms of sliding crossed cylinders of steel, thin film lubricated with a marine diesel engine oil of 60 C, is described for three values of running-in distance, namely 0 m, 30 m and 300 m running-in being performed at a speed of 0.1 ms. It is shown that when using untreated surfaces of ball bearing steel 100 Cr 61, carburized surfaces or ion-nitrided surfaces, loading in excess of a critical load value FNc causes a transition from partial elastohydrodynamic lubrication to unlubricated contact scuffing regime. When using liquid-nitrided surfaces, loading in excess of FNc leads to a transition from partial EHD lubrication of boundary lubrication. This shows that liquid-nitriding considerably increases the upper limit of the temperature range in which boundary lubrication is possible.
- Lubricants and Hydraulic Fluids
- Machinery and Tools