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http://dx.doi.org/10.7777/jkfs.2015.35.1.001

Mechanical Properties of Austempered Fe-2.0wt.%Si-0.3wt.%Mn Steel with various Carbon Contents  

Ha, Jong-Gyu (Depatment of Metallurgical Engineering Graduate School of Kyungpook National University)
Shin, Sang-Yun (Depatment of Metallurgical Engineering Graduate School of Kyungpook National University)
Lee, Do-Hoon (Depatment of Metallurgical Engineering Graduate School of Kyungpook National University)
Ye, Byung-Joon (Depatment of Metallurgical Engineering Graduate School of Kyungpook National University)
Publication Information
Journal of Korea Foundry Society / v.35, no.1, 2015 , pp. 1-7 More about this Journal
Abstract
In this study, we investigated the effect of carbon on mechanical properties with different austempering conditions of high carbon(0.7~1.3wt.%C)-2.0wt.%Si steels. The specimens were austenitized at 850, 925 and $1020^{\circ}C$, and austempered at 260, 320 and $380^{\circ}C$ for the various period of time from 3 min to 300 min. After heat treatment, the evolution of stage I and stage II was identified with optical microscope, XRD and hardness test. When the austempering temperature was $260^{\circ}C$, the microstructure consisted of the lower ausferrite while the upper ausferrite micro-structure was formed at $380^{\circ}C$. As the austempering temperature increases from 260 to $380^{\circ}C$, the tensile strength decreases and elongation increases. In addition, when carbon content increases, tensile strength and elongation decrease.
Keywords
Casting; Retained austenite; Carbon contents; Austempering; Austempered ductile cast iron; Heat treatment; Ausferrite;
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Times Cited By KSCI : 2  (Citation Analysis)
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