Quantitative Evaluation of Carbon-Enriched Stabilised Austenite in Cast Austempered Ductile Iron of Varying Section Thickness
1 Department of Materials Science and Engineering, Obafemi Awolowo University, Ile-Ife. Nigeria
* Corresponding author: olawalejohnoluyemi@njmse.msn.ng
* Corresponding author: olawalejohnoluyemi@njmse.msn.ng
Abstract
The quantity of carbon-enriched stabilised austenite (γHC) in austempered ductile iron (ADI) with various casting thicknesses was evaluated in this study. Ductile iron grade that conforms to ASTM A536 65-45-12 was cast, specimens of section thickness in the range of 5 to 25 mm were machined, isothermally treated to 820°C austenitising temperature, and austempered at austempering temperature (T ) of 300 and 375°C. The resulting phase distributions A of treated specimens were characterised using X-Ray Diffraction (XRD) method. The patterns of XRD were found to consist of ferrite (α) and austenite (γ) phases. The percentage volume of carbon-enriched stabilised austenite in the ADI decreased as section thickness increased. It was concluded that the carbon-enriched stabilised austenite in ADI depends on the casting section thickness and austempering temperature
Keywords
Ductile iron; Aaustempered ductile iron; Carbon stabilised austenite; Acicular ferrite; Casting thickness
How to Cite
Oluyemi, O. J., Ademola, I. S., & Michael., O. K. (2018). Quantitative Evaluation of Carbon-Enriched Stabilised Austenite in Cast Austempered Ductile Iron of Varying Section Thickness. Nigerian Journal of Material Science and Engineering, 8(1), 1-9.
O. J. Oluyemi, I. S. Ademola, and O. K. Michael., "Quantitative Evaluation of Carbon-Enriched Stabilised Austenite in Cast Austempered Ductile Iron of Varying Section Thickness," Nigerian Journal of Material Science and Engineering, vol. 8, no. 1, pp. 1-9, June 2018.
