Destruction of the Inside Part of a Coat of a Hard Chrome Cylinder Used for Combustion Engines
Abstract
This paper had as a starting point the broken down through explosion suffered by the coat of a cylinder made of cast iron. The cylinder coat material must provide the necessary resistance to dynamic and static stresses and, especially, to wear, taking into account the operation in particularly unfavorable friction conditions. Analyzes have been made on the quality of the material in terms of chemical composition and microstructural analysis.
For comparison, the same investigations were carried out on samples taken from a cylinder coat with a good functioning (blank samples). This paper presents the analysis and conclusions regarding the chemical composition of the material from which the landmark chrome cylindrical coat was used for combustion engine, in order to determine the causes of its breakage and the excessive wear of the segments.
References
[2]. Popa B., Băţagă N., Căzilă A., Motoare pentru autovehicule, Editura Dacia, Cluj-Napoca, 1982.
[3]. Levcovici M. S., Studiul materialelor I, Editura Fundaţiei Universitare “Dunărea de Jos”, Galaţi, 2002.
[4]. Potecasu F., Metalurgie fizică, vol. 1, ISBN-978 - 973-8151-48-1; ISBN-978 - 973-8151-49-9- Editura FRM, 2007.
[5]. ***, SR EN ISO 945-1:2009/AC:2010 ver.eng. Microstructura fontelor. Partea 1: Clasificarea grafitului prin analiză vizuală.
[6]. Ripoşan I., Sofroni L., Fonta cu grafit vermicular. Bucureşti. Editura Tehnică, 1984.
[7]. Sofroni L., Ripoşan I., Brabie, V. Chişamera M., Turnarea fontei, Bucureşti. Editura Didactică şi Pedagogică, 1985.
[8]. Potecasu F., Transformări structurale în materiale cristaline – e-book, platforma ugal, 2014.
[9]. Cojocaru- Filipiuc V., Ipoteze cu privire la obţinerea de materiale metalice pe baza tendinţei spre echilibrul chimic - aplicaţii la modificarea fontelor, Iaşi. Editura „Politehnium”, 2011.
[10]. Cojocaru-Filipiuc V., Remanent graphite and its implication in modification process of iron, Metalurgia Internaţional, Vol. XV No. 5. p. 57-62, 2010.
[11]. Jukov A. A., Fe-C. The stable and metastable equilibria. Giessereiforschung, p.106-112, 1992.
[12]. Dumitrescu T., Diagrama de echilibru stabil Fe-C, Ed Universitatea “Dunărea de Jos”, Galaţi, 1989.
