THE STUDY ON THE EFFECT OF CARBON CONTENT ON THE MECHANICAL PROPERTIES AND MICROSTRUCTURE OF SPHERICAL GRAPHITE CAST IRON

Authors

  • Chatree Nutnang Chiangrai College
  • Montri Sukchum Chiangrai College
  • Kitisak Chitprayoon Chiangrai College
  • Aekkawit Poonsawat Chiangrai College

Keywords:

Spheroidal graphite cast iron, Ductile cast iron, Carbon percentage, Ferrite, Pearlite

Abstract

The study of this research was the effects of varying carbon content on ductile cast iron, specifically with carbon contents of 3.0%, 3.5%, and 4.0%. The samples were melted using an induction furnace at temperatures ranging from 1450–1550 °C, with magnesium added at levels between 0.02–0.1% and phosphorus at 0.05%. Comparative testing of mechanical and metallurgical properties was carried out. The experimental results from the comparative analysis of mechanical properties revealed that ductile cast iron with a carbon content of 4.0% exhibited the highest tensile strength at 630.85 MPa, the highest yield strength at 433.96 MPa, and the greatest hardness at 180.5 HB. In contrast, ductile cast iron with a carbon content of 3.0% showed the highest elongation percentage at 22.45%. Regarding the metallographic analysis of the samples with the three different carbon contents, the microstructures were found to be similar. The graphite appeared in a nodular (spherical) form, with the microstructure comprising approximately 80% ferrite and 20% pearlite—consistent with the standard metallurgical characteristics of ductile cast iron.

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Published

2025-06-21

How to Cite

Nutnang, C., Sukchum, M. ., Chitprayoon, K. ., & Poonsawat, A. . (2025). THE STUDY ON THE EFFECT OF CARBON CONTENT ON THE MECHANICAL PROPERTIES AND MICROSTRUCTURE OF SPHERICAL GRAPHITE CAST IRON. Journal of Science and Technology Thonburi University, 9(1), 13–25. retrieved from https://ph03.tci-thaijo.org/index.php/trusci/article/view/3788