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http://dx.doi.org/10.9726/kspse.2013.17.4.109

Heat Resistance Properties of Thin Section HiSiMo Ductile Iron for Exhaust Manifold  

Lee, Do-Kyung (Department of Materials System Engineering, Graduate School, Pukyong National University)
Kim, Sung-Gyu (Department of Materials System Engineering, Pukyong National University)
Lee, Byung-Woo (Department of Materials System Engineering, Pukyong National University)
Publication Information
Journal of Power System Engineering / v.17, no.4, 2013 , pp. 109-114 More about this Journal
Abstract
In this study, the microstructure, mechanical properties and high temperature oxidation characteristics of HiSiMo and HiSiMoM ductile iron for exhaust manifold were investigated. The HiSiMoM ductile iron was developed by optimization of alloying element addition and casting design. The exhaust manifold prototype was fabricated using the HiSiMoM iron and this resulted in the weight saving of 0.73kg. The microstructures of the HiSiMo and HiSiMoM irons were similar each other and graphite nodularity was 89% and 93% respectively. Tensile strengths of them were 663.5 and 674.4 MPa and Brinell hardness were 235.3 and 243.9 respectively. Both irons showed parabolic weight gain behavior in high temperature oxidation atmosphere. Oxidation layer was divided into external and internal layers. The weight gain of the HiSiMoM iron was lower than that of the HiSiMo iron after isothermal oxidation test at $900^{\circ}C$. This should be rationalized by higher Si enrichment at the interface of the matrix and internal layer of the HiSiMoM iron.
Keywords
Exhaust Manifold; HiSiMo Ductile Iron; Graphite Nodularity; Tensile Strength; Brinell Hardness; High Temperature Oxidation;
Citations & Related Records
Times Cited By KSCI : 3  (Citation Analysis)
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