MSE Seminar: Sarum Boonmee, Ductile and Compacted Graphite Iron Casting Skin – Evaluation, Effect on Fatigue Strength and Elimination

PhD Candidate advised by Dr. Doru Stefanescu, Department of Materials Science and Engineering, The Ohio State University

All dates for this event occur in the past.

264 MacQuigg Labs
105 W. Woodruff Ave.
Columbus, OH 43210
United States

Abstract

Compacted graphite (CG) iron features a good combination of tensile strength, impact resistance, thermal conductivity and damping capacity. This makes CG iron a material of choice for various applications, especially for the automobile industry. The mechanical properties of CG iron listed in the standards (i.e. ASTM) are for machined specimens. However, since most iron castings retain the original casting surface (a.k.a. casting skin), the actual performance of the part could be significantly different from that of the machined specimens.

In this research, the effect of the casting skin on mechanical properties in CG and ductile irons (DI) is explored. The differences in tensile and fatigue properties between as-cast and machined samples were quantified and correlated to the casting skin features. Several formation mechanisms of the casting skin were proposed based on important findings. A 2D-thermal diffusion model was used to support the hypotheses. Mold coatings were experiment in attempt to minimize the casting skin formation. Finally, shot blasting was found to be a viable method for the elimination of the casting skin effect.

Bio

Sarum is a doctoral candidate in the Materials Science and Engineering Department at The Ohio State University. He received B.Eng. in Metallurgical Engineering from Suranaree University of Technology in 1998 and M.Eng. in Metallurgical Engineering from Chulalongkorn University in 2004. After graduation, he has joined the School of Metallurgical Engineering, Suranaree University of Technology as a lecturer since 2004. Sarum has been awarded the Thai Royal Scholarship to pursue a doctoral degree in MSE at OSU since 2008. His research interests are solidification science and metallurgy of cast irons. During his time at OSU, he has won the Best Paper Award (Cast Iron Division) at the 115th Metalcasting Congress in 2011 and has published 12 articles in journals, proceedings and magazines. Beside his research, Sarum is very active in student organizations. He served as the President of Thai Student Association at OSU in 2011-2012 and the President of the American Foundry Society Student Chapter at OSU in 2012-2013.