슈퍼 2상 스테인리스강의 공식에 미치는 R상의 영향

이병찬; 오은지; 강창룡; Byung-Chan Lee; Eun-Ji Oh; Chang-Yong Kang

Korean Journal of Materials Research, Vol.24, No.11, 610-616, November, 2014

DOI10.3740/MRSK.2014.24.11.610 Export Citation

슈퍼 2상 스테인리스강의 공식에 미치는 R상의 영향

Effect of and R Phase on the Pitting Corrosion in Super Duplex Stainless Steel

이병찬, 오은지¹, 강창룡^{1, †}

한국폴리텍 VII 대학 울산캠퍼스 신소재응용과
¹부경대학교 금속공학과

Byung-Chan Lee, Eun-Ji Oh¹, and Chang-Yong Kang^{1, †}

Dep. of Advanced Material Application, Ulsan Campus of KOREA POLYTECHNIC, Ulsan, Korea
¹Dept. of Metallurgical Engineering, Pukyong National University, Busan, Korea

E-mail:

In this study, we investigated the precipitation behavior of the R-phase precipitated at the initial stage of aging and its effect on the pitting corrosion of 25%Cr-7%Ni-4%Mo super duplex stainless steel. The R-phase in super duplex stainless steel was mainly precipitated at the interface of ferrite/austenite phases and inside of the ferrite phase during the initial stage of aging, and it was transformed into the σ-phase with an increase in aging time. The ferrite phase was decomposed into a new austenite phase and σ-phase. The R phase was an intermetallic compound, which represented a lower Ni and higher Mo than the matrix, and also had a higher Mo and Cr concentration than the σ phase. With an increasing aging time, the pitting potential Ep was increased slowly by the precipitation of the R-phase, and it was then steeply decreased by the precipitation of the σ-phase. The R-phase was decreased the pitting potential, but its effect was smaller than effect of σ-phase.

Keywords:super duplex stainless steel;pitting corrosion;R- phase;σ-phase;aging treatment

[References]

Pickering FB, Int. Met. Rev., December, 227 (1976).
Baxter CFG, Warburton GR, Proc. Int. Conf. Duplex '94, p.18, Glasgow, Scotland, 13-16, November (1994).
Charles J, Proc. Int. Conf. Duplex '94. Paper KI, Glasgow. Scotland (1994).
Kim SC, Zang Z, Furuya Y, Kang CY, Sung JH, Ni QQ, Watanabe Y, Kim IS, Mater. Trans., 46(7), 1056 (2005)
Nicholls JM, Int. Conf. Duplex '94, Paper. KIII, Glasgow, Scotland, 13-16 November (1994).
Huhala T, Nilson JU, Wilson A, Jonson P, Int. Conf. Duplex '94, p.43, Glasgow, Scotland, 13-16 November (1994).
Hwang TH, Kim JH, Kim KH, Moon WJ, Kang CY, Met. Mater. Int., 20(1), 13 (2014)
Lee BC, Kang CY, Korean J. Mater. Res., 24(8), 401 (2014)
Namgung W, Kang CY, J. Ocean Eng. Technol., 27(2), 2287 (2013)
Cui J, Park IS, Kang CY, Miyahara K, ISIJ International, 41(2), 192 (2001)
Nilson JO, Mater. Sci. Technol., 7, 853 (1991)
Tehovnic F, et al., Mater. Technol., 45(4), 339 (2011)
Erahimi N, et al., Corrosion Sci., 453, 1278 (2011)
Karlsson L, et al., Welding in the world, 43(5), 20 (1999)
Park CJ, et al., Corrosion, 61(1), 76 (2005)

[Referenced By]

[1] Pickering FB, Int. Met. Rev., December, 227 (1976).

[2] Baxter CFG, Warburton GR, Proc. Int. Conf. Duplex '94, p.18, Glasgow, Scotland, 13-16, November (1994).

[3] Charles J, Proc. Int. Conf. Duplex '94. Paper KI, Glasgow. Scotland (1994).

[4] Kim SC, Zang Z, Furuya Y, Kang CY, Sung JH, Ni QQ, Watanabe Y, Kim IS, Mater. Trans., 46(7), 1056 (2005)

[5] Nicholls JM, Int. Conf. Duplex '94, Paper. KIII, Glasgow, Scotland, 13-16 November (1994).

[6] Huhala T, Nilson JU, Wilson A, Jonson P, Int. Conf. Duplex '94, p.43, Glasgow, Scotland, 13-16 November (1994).

[7] Hwang TH, Kim JH, Kim KH, Moon WJ, Kang CY, Met. Mater. Int., 20(1), 13 (2014)

[8] Lee BC, Kang CY, Korean J. Mater. Res., 24(8), 401 (2014)

[9] Namgung W, Kang CY, J. Ocean Eng. Technol., 27(2), 2287 (2013)

[10] Cui J, Park IS, Kang CY, Miyahara K, ISIJ International, 41(2), 192 (2001)

[11] Nilson JO, Mater. Sci. Technol., 7, 853 (1991)

[12] Tehovnic F, et al., Mater. Technol., 45(4), 339 (2011)

[13] Erahimi N, et al., Corrosion Sci., 453, 1278 (2011)

[14] Karlsson L, et al., Welding in the world, 43(5), 20 (1999)

[15] Park CJ, et al., Corrosion, 61(1), 76 (2005)