Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Effect of Microstructure on the High Deformation Stability of Incoloy 825 Alloy

Incoloy 825 합금의 고온 변형 안정성에 미치는 미세조직의 영향

  • Kang, Chang-Yong (Department of Metallurgical Engineering, Pukyong National University) ;
  • Kim, Seong-Hwi (Department of Metallurgical Engineering, Pukyong National University) ;
  • Park, Young-Tae (Research & Engineering Team, Seohan ENP.)
  • Received : 2016.11.12
  • Accepted : 2017.03.31
  • Published : 2017.04.30
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Abstract

This study was carried out to investigate the effect of precipitate on the high temperature deformation stability of incoloy 825 alloy. $Cr_{23}C_6$ carbide was precipitated under $950^{\circ}C$, but was not detected over $1,000^{\circ}C$. Most of the precipitation consist of $Cr_{23}C_6$ carbide. Strain-rate sensitivity was the highest in 0.01/s and the lowest in 10/s. Strain-rate sensitivity was decreased sharply below $950^{\circ}C$. In the temperature between $850^{\circ}C{\sim}1,150^{\circ}C$, plastic instable area did not exist. It showed the lowest Ziegler Parameter value of 0.06 Ziegler Parameter was the lowest as 0.06 at $850^{\circ}C$ with 10s-1 of strain. The highest Ziegler Parameter value(0.43) was found in plastic deformation at $1,050^{\circ}C$ with 0.01s-1 of strain. It tends to have an higher resistance to the high temperature deformation under $950^{\circ}C$, due to the precipitation.

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References

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