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http://dx.doi.org/10.7777/jkfs.2014.34.1.001

The Austempering Transformation Behavior of Fe-0.7wt.%C-2.3wt.%Si-0.3wt.%Mn Steel  

Shin, Sang-Yun (Department of Metallurgical Engineering Graduate School of Kyungpook National University)
Lee, Do-Hoon (Department of Metallurgical Engineering Graduate School of Kyungpook National University)
Kim, Seo-Eun (Department of Metallurgical Engineering Graduate School of Kyungpook National University)
Ye, Byung-Joon (Department of Metallurgical Engineering Graduate School of Kyungpook National University)
Publication Information
Journal of Korea Foundry Society / v.34, no.1, 2014 , pp. 1-5 More about this Journal
Abstract
The austempering transformation behavior in Fe-0.7wt.%C-2.3wt.%Si-0.3wt.%Mn steel is investigated. Each specimen was austenitized for 60 min at $900^{\circ}C$, and austempered at $380^{\circ}C$ for different time periods varying from 2 min to 256 min. After the austempering heat treatment, the Stage I and II evolutions are performed using optical metallography, X-ray diffraction and image analyses. Variations in the X-ray diffraction patterns and lattice parameters of the ferrite and austenite demonstrate that the residual austenite decomposes into ferrite and carbide during the Stage II evolution; moreover the amount of ferrite increases during the Stage I evolution. While the amount of austenite increases during Stage I, it dicreases during Stage II. Overall, the variations in the volume fractions of the microstructure and carbide formation in stages I and II meet high temperature austempering reaction of the ausferrite microstructure.
Keywords
Casting; Hot rolling; Processing Window; Austempering; Austempered Ductile Cast Iron; Heat Treatment; Ausferrite;
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Times Cited By KSCI : 1  (Citation Analysis)
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