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http://dx.doi.org/10.9726/kspse.2017.21.2.020

Effect of Microstructure on the High Deformation Stability of Incoloy 825 Alloy  

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.)
Publication Information
Journal of Power System Engineering / v.21, no.2, 2017 , pp. 20-26 More about this Journal
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.
Keywords
Incoloy 825 alloy; Hot deformation; Strain rate sensitivity; Processing map; High temperature compression test;
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Times Cited By KSCI : 1  (Citation Analysis)
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