Beneficial Effect of Impurity Sulfur on High-Temperature Steam Oxidation of High Chromium Ferritic Steels

Abstract:

The effect of S in steels on high-temperature steam oxidation resistance was investigated with respect to the content and the state in high Cr ferritic steels. The beneficial sulfur effect on high-temperature steam oxidation resistance was verified in high Cr ferritic steels. It was considered that Cr was enriched in the vicinity of the segregated S on the specimen surface because of a strong affinity between Cr and S atoms, resulting in the easy formation of the passive Cr2O3 oxide layer on the surface even after the steam oxidation test for a short time. It was found that the precipitated S operated more effectively to the improvement of the steam oxidation resistance compared to the solid-solution state of S in the steels. Furthermore, the sulfur effect on the high temperature steam oxidation resistance was related strongly to the amount of dissolution hydrogen in the high Cr ferritic steels.

• Periodical: Materials Science Forum (Volumes 522-523)
• Pages: 147-154
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.522-523.147
• Online since: August 2006
• Authors: Yoshinori Murata, Masaaki Nakai, K. Nagai, Masahiko Morinaga, Y. Sasaki, Ryokichi Hashizume
• Keywords: Cr₂O₃, Ferritic Steel, Hydrogen Desorption, Impurity, Steam Oxidation, Sulfide, Sulfur

References

[1] M. Morinaga, Y. Murata, R. Hashizume and Y. Sawaragi: ISIJ Int., 41(2001) 314-316.

[2] Y. Murata, M. Morinaga, R. Hashizume Y. Sawaragi and M. Nakai: Proc. 9th Int. Conf. on Creep and Fracture of Engineering Materials and Structures and 3rd EPRI Conf. on Advances in Materials Technology for Fossil Power Plants, ed. by R. Viswanathan et. al., (The Inst. Mater. London, 2001) pp.367-374.

[3] M. Nakai, Y. Murata, M. Morinaga, R. Hashizume and Y. Sawaragi: Mater. Sci. Forum, 426-432(2003) 1029-1034.

[4] M. Nakai, Y. Murata, M. Morinaga and R. Hashizume: Mater. Trans., 44(2003) 1830-1838.

[5] Y. Murata, M. Morinaga, N. Inagaki and M. Nakai: Mater. Trans., 43(2002) 1258-1259.

[6] F.H. Scott: Mater. Sci. Technol. 5(1989) 734-740.

[7] A. Paúl, S. Elmrabet, L.C. Alves, M.F. da Silva, J.C. Soares and J.A. Odriozola: Nucl. Instrum. Methods. Phys. Res. B, 181(2001) 394-398.

[8] I. Kvernes, M. Oliveira and P. Kofstad: Corros. Sci. 17 (1977) 237-252.

[9] K. Nakagawa, Y. Matsunaga and T. Yanagisawa: Mater. High Temp. 18 (2001) 51-56.

[10] K. Nakagawa, Y. Matsunaga and T. Yanagisawa: Mater. High Temp. 20 (2003) 67-73.

[11] K. Oikawa, H. Mitsui, H. Ohtani and K. Ishida: ISIJ Int., 40(2000) 182-190.

[12] M. Hansen: Constitution of binary alloys, 2. ed., prepared with the cooperation of Kurt Anderko, Metallurgy and Metallurgical Engineering Series, (McGraw-Hill, New York, 1958) pp.704-708.

[13] K. Ichitani, M. Kanno: Sci. Technol. Adv. Mater. 4 (2003), 545-551.