Journal of Korea Foundry Society (한국주조공학회지)

Korea Foundry Society (한국주조공학회)
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The Austempering Transformation Behavior of Fe-0.7wt.%C-2.3wt.%Si-0.3wt.%Mn Steel

Fe-0.7wt.%C-2.3wt.%Si-0.3wt.%Mn 강의 오스템퍼링 변태 거동

  • 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)
  • Received : 2013.11.22
  • Accepted : 2014.01.28
  • Published : 2014.02.28
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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.

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References

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  1. Mechanical Properties of Austempered Fe-2.0wt.%Si-0.3wt.%Mn Steel with various Carbon Contents vol.35, pp.1, 2015, https://doi.org/10.7777/jkfs.2015.35.1.001