니켈기 합금 Alloy 617의 950℃ 대기/헬륨 분위기에서 산화거동 고찰
Investigation of Oxidation Behavior of Alloy 617 under Air/Helium Environments at 950℃
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Alloy 617 is a candidate Ni-based superalloy for intermediate heat exchanger (IHX) of a high-temperaturegas reactor (VHTR), because of its good creep strength and corrosion resistance at high temperature. Smallamount of impurities such as H2O, H2, CO and CH4 are introduced inevitably in helium, as a coolant duringoperation of a VHTR. Reactions of material and impurities are accelerated with increase of temperatureto 950℃ of operating temperature of a VHTR, leading to material corrosion aggravation. In this circumstance,high-temperature corrosion tests were performed at 950℃ in air and impure helium environments, up to 250 hours in this study. Oxidation rate of 950 ℃ in an air environment was higher than that of impurehelium, explained by difference in outer oxide morphology and microstructure as a function of oxygenpartial pressure. An equiaxed Cr-rich surface oxide layer was formed in an air environment, and a columnarCr-rich oxide was formed in an impure helium environment.
Abstract
Alloy 617 is a candidate Ni-based superalloy for intermediate heat exchanger (IHX) of a high-temperaturegas reactor (VHTR), because of its good creep strength and corrosion resistance at high temperature. Smallamount of impurities such as H2O, H2, CO and CH4 are introduced inevitably in helium, as a coolant duringoperation of a VHTR. Reactions of material and impurities are accelerated with increase of temperatureto 950℃ of operating temperature of a VHTR, leading to material corrosion aggravation. In this circumstance,high-temperature corrosion tests were performed at 950℃ in air and impure helium environments, up to 250 hours in this study. Oxidation rate of 950 ℃ in an air environment was higher than that of impurehelium, explained by difference in outer oxide morphology and microstructure as a function of oxygenpartial pressure. An equiaxed Cr-rich surface oxide layer was formed in an air environment, and a columnarCr-rich oxide was formed in an impure helium environment.
참고문헌 (23)
- G .R. Wallwork, , Oxidation of Metals, 3, pp.171~ (1971)[DOI]
- T. Takasugi, , Acta Met., 33, pp.1247~ (1985)[DOI]
- J. C. Jung, , J. of the Korean lnst. of met. & Mater., 7, pp.841~ (1997)
- Special Metals Publication, "Number SMC-029, Alloy 617", ~ (2005)
- W. Ren, , J. Pressure Vessel Technol., 131, pp.024002~ (2009)[DOI]
- Y. Hosoi, , Metall. Trans., 6A, pp.1171~ (1975)
- M. R. Quadakkers, , Werkst. Korro., 36, pp.335~ (1984)
- H. -J. Christ, , Mater. Sci. Eng., 87, pp.161~ (1987)[DOI]
- F. Rouillard, , J. Nucl. Mater., 362, pp.248~ (2007)[DOI]
- P. S. Shankar, , J. Nucl. Mater., 366, pp.28~ (2007)[DOI]
- W. Kim, , Int. J. of PVP., 87, pp.289~ (2010)
- D. Kim, , Oxidation of Metals, 75, pp.103~ (2011)[DOI]
- T. C. Totemeier, , Mater. Sci. Eng. A, 468, pp.81~ (2007)
- 이경근, "950℃ 순수헬륨 분위기에서 크리프 파단된 Alloy 617의 미세구조적 고찰", 한국재료학회지, 21(11), pp.596~603 (2011), 한국재료학회
- 김동진, "INVESTIGATION ON MATERIAL DEGRADATION OF ALLOY 617 IN HIGH TEMPERATURE IMPURE HELIUM COOLANT", Nuclear Engineering and Technology, 43(5), pp.429~436 (2011), 한국원자력학회
- N. Birks, "Introduction to the High-Temperature Oxidation of Metals 2nd", pp.49~50 (2006), Cambridge University Press
- D. Young, "High Temperature Oxidation and Corrosion of Metals", pp.81~ (2008), Elsevier
- Denny A. Jones, "Principles and Prevention of Corrosion 2nd", pp.425~ (2011), Pearson
- C. Cabet, , Proc. of HTR 2010, pp.54~ (2010)
- W. G. Kim, , Int. J. Press.Vess. Pip., 87, pp.289~ (2010)[DOI]
- G.-G. Lee, , J. Mater. Sci. Technol., 29, pp.1177~ (2013)[DOI]
- B. K. Lee, , Acta Materialia., 48, pp.1575~ (2000)[DOI]
- J. Chang, , Key Engineering Materials, 352, pp.25~ (2007)[DOI]