Evaluation of the Susceptibility to Intergranular Corrosion for a Novel Cr-Mn-N Austenitic Stainless Steel Using DL-EPR

Abstract:

The sensitization and intergranular corrosion (IGC) behavior of a novel Cr-Mn-N austenitic stainless steel (named as MPMD133) sensitized in the temperature range from 600 oC to 1000oC for 3 hours was investigated by the double loop electrochemical potentiokinetic reactivation (DL-EPR) test. The effects of the sensitization temperature on the susceptibility to IGC of MPMD133 were examined in the 0.5M H₂SO₄ +0.01M KSCN electrolyte solution. The results show that the degree of IGC increases as the sensitization temperature increasing till 900oC. Meanwhile it decreases rapidly when the sensitization temperature is elevated up to 1000oC, which is confirmed by the subsequent optical micrographs observation. The XRD analysis reveals that the precipitation of Cr₂₃C₆ leads to chromium depletion along the grain boundaries, consequently results in the susceptibility to IGC.

• Periodical: Advanced Materials Research (Volumes 631-632)
• Pages: 192-197
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.631-632.192
• Online since: January 2013
• Authors: Lei Gang Zheng, Xiao Qiang Hu, Xiu Hong Kang, Dian Zhong Li
• Keywords: Cr-Mn-N Austenitic Stainless Steel, DL-EPR, Intergranular Corrosion (IGC)

References

[1] R.P. Reed, Nitrogen in austenitic stainless steels, JOM, 41 (1989) 16-21.

DOI: 10.1007/bf03220991

[2] J.W. Simmons, Overview: high-nitrogen alloying of stainless steels, Mater. Sci. Eng. A, 207 (1996) 159-169.

[3] R. Jones, V. Randle, Sensitization behavior of grain boundary engineered austenitic stainless steel, Mater. Sci. Eng. A, 527 (2010) 4275-4280.

DOI: 10.1016/j.msea.2010.03.058

[4] N. Parvathavarthini, U.K. Mudali, L. Nenova, C. Andreev, B. Raj, Sensitization and intergranular corrosion behavior of high nitrogen type 304LN stainless steels for reprocessing and waste management applications, Metall. Mater. Trans. A, 43A (2012).

DOI: 10.1007/s11661-011-1053-9

[5] G.H. Aydogdu, M.K. Aydinol, Determination of susceptibility to intergranular corrosion and electrochemical reactivation behavior of AISI 316L type stainless steel, Corros. Sci., 48 (2006) 3565-3583.

DOI: 10.1016/j.corsci.2006.01.003

[6] N. Lopez, M. Cid, M. Puiggali, I. Azkarate, A. Pelayo, Application of double loop electrochemical potentiodynamic reactivation test to austenitic and duplex stainless steels, Mater. Sci. Eng. A, 229 (1997) 123-128.

DOI: 10.1016/s0921-5093(97)00008-7

[7] V. Cihal, R. Stefec, On the development of the electrochemical potentiokinetic method, Electrochim. Acta, 46 (2001) 3867-3877.

[8] N. Parvathavarthini, S. Mulki, R.K. Dayal, I. Samajdar, K.V. Mani, B. Raj, Sensitization control in AISI 316L(N) austenitic stainless steel: Defining the role of the nature of grain boundary, Corros. Sci., 51 (2009) 2144-2150.

DOI: 10.1016/j.corsci.2009.05.045

[9] A.P. Majidi, M.A. Streicher, The double loop reactivation method for detecting sensitization in AISI-304 stainless-steels, Corros., 40 (1984) 584-593.

DOI: 10.5006/1.3581921

[10] R.F.A. Jargelius, S. Hertzman, E. Symniotis, H. Hänninen, P. Aaltonen, Evaluation of the EPR technique for measuring sensitization in type 304 stainless steel, Corros., 47 (1991) 429-435.

DOI: 10.5006/1.3585274

[11] R. Katsura, M. Kodama, S. Nishimura, DL-EPR study of neutron-irradiation in type-304 stainless-steel, Corros., 48 (1992) 384-390.

DOI: 10.5006/1.3315949

[12] H. Sidhom, T. Amadou, H. Sahlaoui, C. Braham, Quantitative evaluation of aged AISI 316L stainless steel sensitization to intergranular corrosion: Comparison between microstructural electrochemical and analytical methods, Metall. Mater. Trans. A, 38A (2007).

DOI: 10.1007/s11661-007-9114-9

[13] P. De Tiedra, Ó. Martín, M. López, M. San-Juan, Use of EPR test to study the degree of sensitization in resistance spot welding joints of AISI 304 austenitic stainless steel, Corros. Sci., 53 (2011) 1563-1570.

DOI: 10.1016/j.corsci.2011.01.036

[14] F. Shi, Y. Qi, C.M. Liu, Effects of Mn on the precipitation behaviors in high-nitrogen austenitic stainless steels, Adv. Eng. Mater., 194-196 (2011) 32-37.

DOI: 10.4028/www.scientific.net/amr.194-196.32

[15] H.B. Li, Z.H. Jiang, Z.R. Zhang, Y. Cao, Y. Yang, Intergranular corrosion behavior of high nitrogen austenitic stainless steel, Int. J. Miner. Mtall. Mater., 16 (2009) 654-660.