Reciprocating wear of mild steel carburized using Na2co3-Nacl under lubrication

Willey Y.H. Liew and R. Protasius and Jester L.J. Ling and Nancy Julius Siambun and Chua, Bih Lii and Melvin Gan Jet Hong (2024) Reciprocating wear of mild steel carburized using Na2co3-Nacl under lubrication. ADVANCES IN MATERIALS AND PROCESSING TECHNOLOGIES. pp. 1-22. ISSN 2374-068X

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Abstract

The tribological behavior of non- and carburized mild steel under oil lubrication was investigated. 2 types of carburized steel specimens were used in this study. The surface of the first type of the carburized steel was rich in retained austenite. Towards the core, the amount of austenite reduced, and the amount of martensite increased. In contrast, the surface and subsurface of the second type carburized steel was rich in martensite. In the sliding tests carried out under hydrodynamic lubrication, the COF was found to reduce with increased load before boundary lubrication occurred at loads above 150 N. Under boundary lubrication at 1000 N, the martensite in the carburized layer reacted with the hydrocarbon and oil additive to form a lubricant film consisting of C-C, C=O, C-P, and C-O. This resulted in reduced COF and wear rate, if catastrophic fracture did not take place. The average COF and wear rate obtained at this load was 0.085–0.096 and 1.69–0.94 × 10−11 mm3 / Nm, respectively, lower than those that obtained at 600 N which were 0.108–0.109 and 2.89–4.86 × 10−11 mm3 /Nm, respectively. The lubricant film formed on the retained austenite, which involved only limited reaction with the hydrocarbon to form C-C, C=O, did not produce any such beneficial effect. These results showed that the presence of the retained austenite made the worn surface less favorable to form an effective anti-wear lubricant film.

Item Type:	Article
Keyword:	Carburisation, friction, lubricant, microstructure
Subjects:	T Technology > TA Engineering (General). Civil engineering (General) > TA1-2040 Engineering (General). Civil engineering (General) > TA401-492 Materials of engineering and construction. Mechanics of materials T Technology > TP Chemical technology > TP1-1185 Chemical technology > TP670-699 Oils, fats, and waxes > TP690-692.5 Petroleum refining. Petroleum products
Department:	FACULTY > Faculty of Engineering
Depositing User:	JUNAINE JASNI -
Date Deposited:	13 Aug 2025 11:25
Last Modified:	13 Aug 2025 11:25
URI:	https://eprints.ums.edu.my/id/eprint/44780

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