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

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 ℃ , but was not detected over 1,000 ℃ . 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 ℃ . In the temperature between 850 ℃ ~1,150 ℃ , 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 ℃ with 10s-1 of strain. The highest Ziegler Parameter value(0.43) was found in plastic deformation at 1,050 ℃ with 0.01s-1 of strain. It tends to have an higher resistance to the high temperature deformation under 950 ℃ , due to the precipitation.