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http://dx.doi.org/10.7777/jkfs.2021.41.4.331

Effects of Heat-Treatment and the Addition of Copper on the Processing Window of 3.6wt%C-2.5wt%Si Austempered Ductile Cast Iron  

Kwon, Do-Young (Haewon Ind. Inc.)
Oh, Jeong-Hyeok (Institute of Tech., Doosan Infracore)
Kim, Gi-Yeob (Dept. of Advanced Material Application, Korea Polytechnics Colleges)
Kwon, Hae-Wook (Yeongyeong Foundry Technology Research Institute)
Publication Information
Journal of Korea Foundry Society / v.41, no.4, 2021 , pp. 331-341 More about this Journal
Abstract
The effects of austempering temperature, austenitizing temperature and time, added copper content and prior heat-treatment on the processing window of 3.6wt%C-2.5wt%Si ductile cast iron during austempering. The maximum processing window was obtained at 350℃ of austempering temperature. The processing window was increased with increased austenitizing temperature from 850 to 900℃; however, it decreased at 950℃. The processing window was increased with increased austenitizing time from 0.5 to 2 hours and rather decreased for 4 hours. The optimum condition of austenitizing was obained at 900℃ for 2 hours. The processing window was increased with copper content added in the range of 0.0~0.8wt%. The processing window was increased by prior normalizing heat-treatment and decreased by prior annealing in comparison with that for the as-cast state,
Keywords
Cast iron; Ductile cast iron; Austempered ductile cast iron; Processing window; Heat-treatment and Austempering;
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