Compacted Graphite Iron (CGI) has proven itself against the challenging engine conditions to meet the requirements for strict emission limits by having better mechanical properties rather than gray cast iron. The aim of this work is to enhance the mechanical properties of locally produced CGI material, thus increasing its fatigue life and resistance against the actual working conditions. This is achieved by changing the microstructure of CGI. Improved microstructural and mechanical properties are obtained by adding pearlite stabilizers and finding a chemical equilibrium between the alloying elements. The material specification for CGI was not fulfilled in the case of cylinder head production due to the low mechanical properties and insufficient magnesium treatment. An extensive comparative search was conducted between the main and prototype cylinder heads, aligned with the literature review. It is found that the amount of pearlite stabilizers were low in the CGI alloys. At first, the amount of pearlite stabilizers are increased individually; however, it is observed that this method did not give satisfactory results in terms of microstructure and physical properties. Then, it is decided to balance the amount of different pearlite stabilizers and find the optimal properties, as well as the minimum cost to produce the cylinder heads. It is found that adding 0.7 % Mn and balancing the CuE between 1.5-1.8 resulted in satisfactory mechanical properties and fully pearlitic microstructure.
CGI development for ecotorq cylinder head at Ford Otosan
2008
11 Seiten, 7 Bilder, 4 Tabellen, 7 Quellen
Aufsatz (Konferenz)
Englisch
Permanent mold does the job for new Ford cylinder head
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