Daigeng Wu , Xingyu Liang , Xue Wen , Zhongwei Meng , Zehui Yu , Yongdi He , Peng Dai , Yonglin Yu , Nan Li
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Abstract
Studying the wear of cylinder liner and piston ring caused by deposits helps improve engine reliability. Deposits generated from a coastal diesel engine are collected, including impurity deposits from intake duct (#1) and carbon deposits from piston (#2), piston ring (#3), and cylinder liner top (#4). Using reciprocating friction tester, the influence of #1 and #2 on surface wear is studied under varying oil film thicknesses. Then combining Inductively Coupled Plasma Mass Spectrometer (ICP-MS), Thermogravimetric Analysis (TGA), and Scanning Electron Microscope (SEM) to explore potential wear mechanism. Results show that insufficient lubrication and the presence of intake duct deposits are the two main causes of wear. Under low oil film thickness (Oil-L), a transition from good to poor lubrication occurs, leading to increased wear. Adding deposits significantly increases the coefficient of friction (COF). However, insufficient lubrication poses higher wear risks than the absence of lubrication. Among them, ‘#1 + Oil-L’ exhibits the most severe wear, with the COF rising from 0.530 (#1 only) to 0.619 and producing the deepest scratch of 32 μm. This severe wear after adding #1 correlates with a higher proportion of sand and metal shown in physicochemical analysis, as well as the needle-like Fe2O3 corrosion products observed after TGA oxidation. Additionally, this study also discusses the possible reasons for insufficient lubrication and the potential effect of detected lubricant contamination in this engine. Enhancing engine lubrication and controlling intake impurities are critical strategies to mitigate abnormal honing texture wear.
期刊介绍：
Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies.
Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials.
Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged.
Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.
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