Micro-pitting Damage of Bearing Steel Surfaces under Mixed Lubrication Conditions: Effects of Roughness, Hardness and ZDDP Additive
| Autor: | Aleks Vrček, Yannick Baubet, Pär Marklund, Roland Larsson, Tobias Hultqvist |
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| Rok vydání: | 2019 |
| Předmět: |
Bearing (mechanical)
Materials science Mechanical Engineering 02 engineering and technology Surfaces and Interfaces Surface finish 021001 nanoscience & nanotechnology Mechanical components Surfaces Coatings and Films law.invention Micro pitting 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Sliding contact law Lubrication Lubricant Composite material 0210 nano-technology Beneficial effects |
| Zdroj: | Tribology International. 138:239-249 |
| ISSN: | 0301-679X |
| DOI: | 10.1016/j.triboint.2019.05.038 |
| Popis: | Micro-pitting presents a failure of the rolling/sliding contact metal asperities operating under boundary/mixed lubrication conditions. The studies have shown that micro-pitting failure competes with mild wear and that lubricant additives can have either detrimental or beneficial effects on micro-pitting evolution. This article describes a methodology to investigate micro-pitting damage on bearing steels using a twin-disc machine to better represent mechanical components, i.e. bearings, crankshafts, etc. In addition, effects of roughness, hardness and the ZDDP additive are presented and discussed. A sufficient hardness difference can completely eliminate micro-pitting damage mode. Furthermore, the presence of ZDDP anti-wear additive in fully formulated engine oil was shown to protect rougher surfaces and promote wear on smoother surfaces, thus completely eliminating the micro-pitting damage mode. |
| Databáze: | OpenAIRE |
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