DOI QR코드

DOI QR Code

Effect of Oxygen Injection on Microstructure and Mechanical Properties of Ni-based Superalloy Recycled by AOD Process

AOD공정으로 재활용된 니켈합금의 산소주입량에 따른 조직과 기계적 성질 변화

Lee, Duk-Hee;Woo, Kee-Do;Kang, Whang-Jin;Yoon, Jin-Ho
이덕희;우기도;강황진;윤진호

  • Received : 2016.01.22
  • Accepted : 2016.03.09
  • Published : 2016.04.30

Abstract

In this study, the Ni base superalloy was recycled by Argon oxygen decarburization(AOD) process using an inconel 713C scrap. During AOD process, argon gas was continuously injected 1,000 sccm and oxygen gas was injected into 10, 20 and 30 minutes of 100, 250 and 500 sccm.. In early stage of oxygen injection, the oxygen dose increased with increasing Al, Cr, and Mo content and decreasing C content. And Al content was decreased by carburization with added elements in late stage Because of oxidation was occurred with Al, Cr etc. after the reaction of carbon has been finished. From the results, the ratio of ${\gamma}^{\prime}$ phase reduced due to decreasing of Al content for that reason Al is the main element to form the ${\gamma}^{\prime}$ phase. Also carbide reduced owing to decreasing of C content so the mechanical properties of the specimens excessively injected by excess $O_2$ gas were decreased.

Keywords

Ni base superalloy;scrap;recycle;AOD process;oxygen injection

References

  1. Park, H. K, Shin, H. D., 2009 : "Current Status on the Recycling of Domestic Nonferrous Metal Scraps", J. of Korean Inst. of Resources Recycling, Vol. 18, pp. 52-57.
  2. Binczyk, F., Sleziona, J., 2010 : "Effect of modification on the mechanical properties of IN-713C alloy", Archives of Foundry Eng., Vol. 10, pp. 195-198.
  3. Mousavizade, S. M. et al., 2009 : "Effect of severe plastic deformation on grain boundary liquation of a nickel-base superalloy", Script. Mater., Vol. 60, pp. 244-247. https://doi.org/10.1016/j.scriptamat.2008.10.021
  4. Takahashi, A., Kawanabe, M. and Ghoniem, N. M., 2010 : "${\gamma}$-precipitate strengthening in nickel-based superalloys", Phil. Mag., Vol. 90, pp. 3767-3786. https://doi.org/10.1080/14786435.2010.497470
  5. Lachowicz, M. B., Faryna, M., Podrez-Radziszewska, M., 2011 : "Grain size reduction in the 713C nickel super alloy as a result of heat treatment", Archives of Foundry Eng., Vol. 11, pp. 143-148.
  6. Yoo, K. K. et al., 2008 : "Separation of Ni and Fe from $H_2SO_4$ leaching solution of scrapped Fe-Ni alloy", J. of Korean Inst. of Resources Recycling, Vol. 17, pp. 80-87.
  7. Binczyk, F., Sleziona, J., 2009 : "Macro- and microhardness of IN-713C nickel superalloy constituents", Archives of Foundry Eng., Vol. 9, pp. 9-12.
  8. Maccagno, T. M. et al., 1990 : "Microstructure, creep properties, and rejuvenation of service-exposed alloy 713C turbine blades", Metall. Trans. A, Vol. 21, pp. 3115-3125. https://doi.org/10.1007/BF02647308
  9. Chaturvedi, M. C., Han, Y. F., 1983 : "Strengthening mechanisms in Inconel 718 superalloy", Mater. Sci. Technol., Vol. 17, pp. 145-149.
  10. de Barbadillo, J. J., 1983 : "Nickel-Base Superalloys; Physical Metallurgy of Recycling", Metall. Trans. A, Vol. 14, pp. 329-341. https://doi.org/10.1007/BF02644211