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Effects of Cast-Iron Surface Texturing on the Anti-Scuffing Performance under Starved Lubrication

1
Marine Engineering College, Dalian Maritime University, Dalian 116026, China
2
Key Laboratory of Ship-Machinery Maintenance & Manufacture, Dalian Maritime University, Dalian 116026, China
*
Authors to whom correspondence should be addressed.
Materials 2019, 12(10), 1586; https://doi.org/10.3390/ma12101586
Received: 28 March 2019 / Revised: 10 May 2019 / Accepted: 13 May 2019 / Published: 15 May 2019
(This article belongs to the Special Issue Tribology: Friction and Wear of Engineering Materials)
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Abstract

Advances in heavy-duty diesel engine designs place higher demands on the friction and wear performance of the piston ring and cylinder liner (PRCL) interface. The potential of using micro-textures machined on the whole stroke of a cast-iron cylinder liner was investigated in this work. A set of running-in and starved lubrication experiments was performed using a custom reciprocating test rig that imparts a combination of combustion-level pressures and the resulting impacts. Based on a comparison of micro-dimple parameters, the friction coefficient for the running-in period at the shocking dead center was the smallest at a designed combination of 1000-μm diameter, 22% area fraction, and arrangement with half-radius intersecting distance of two adjacent micro-dimple columns. The non-scuffing time under starvation was the longest at a designed combination of the following parameters: 800 μm diameter, 22% area fraction, and quarter-radius intersecting distance arrangement. From finite element analysis, it was found that stress concentrates at the micro-dimple periphery and at the connections between adjacent micro-dimples. However, surface topography examination showed that scuffing initiates in the non-dimpled regions between the micro-dimpled columns rather than at their edges. Finally, under reciprocating motion, micro-dimples can collect wear debris to inhibit further propagation of scuffing in the micro-dimpled region. View Full-Text
Keywords: cast iron; cylinder liner; micro-dimple; friction coefficient; anti-scuffing; starvation cast iron; cylinder liner; micro-dimple; friction coefficient; anti-scuffing; starvation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Li, W.; Yu, B.; Ye, B.; Shen, Y.; Huang, R.; Du, F. Effects of Cast-Iron Surface Texturing on the Anti-Scuffing Performance under Starved Lubrication. Materials 2019, 12, 1586.

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