Effect of Cooling Time on Microstructure and Properties of 2507 Super Duplex Stainless Steel Welding Heat-Affect Zone

Abstract:

The welding thermal simulation of 2507 Super Duplex Stainless Steel (SDSS) was investigated using Gleeble-3800 thermo-mechanical simulator. The morphology evolution of austenite and ferrite under different t_8/5 and t_12/8 were observed and compared. The impact tests and pitting corrosion tests under different t_8/5 and t_12/8 were conducted. The results showed that the austenite content increased and the austenitic morphology changed from allotriomorphic structure to strip or coarse-blocky structures with the increase of t_8/5 and t_12/8. The effect of t_12/8 on the microstructure of welding Heat Affect Zone (HAZ) was more distinct than that of t_8/5. The impact toughness of HAZ with the increase of t_12/8 was improved due to higher austenite content, while that with the increase of t_8/5 was slightly decreased due to the formation of intermediate phase, such as σ phase. The corrosion tests showed that the pitting resistance of HAZ was improved with the increase of t_8/5 and t_12/8, while the effect of t_12/8 was especially evident.

• Periodical: Materials Science Forum (Volume 940)
• Pages: 53-58
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.940.53
• Online since: December 2018
• Authors: Yu Qing Zhou*, De Ning Zou, Ke Xin Li, Wei Zhang, Rong Liu, Ying Han
• Keywords: HAZ, Impact Toughness, Pitting Corrosion, Super Duplex Stainless Steel, Welding Thermal Simulation

References

[1] J.M. Shockley, D.J. Horton, K.J. Wahl, Effect of Aging of 2507 Super Duplex Stainless Steel on Sliding Tribocorrosion in Chloride Solution, Wear 380-381 (2017) 251-259.

DOI: 10.1016/j.wear.2017.03.019

[2] J.O. Nilsson, Overview super duplex stainless steels, Mater. Sci. Technol. 8 (1992) 685-700.

[3] D. N. Zou, Y. Han, W. Zhang, G.W. Fan, Phase Transformation and Its Effects on Mechanical Properties and Pitting Corrosion Resistance of 2205 Duplex Stainless Steel, J. Iron Steel Res. 17 (2010) 67-72.

DOI: 10.1016/s1006-706x(10)60172-0

[4] Z.G. Song, H. Feng, S.M. Hu, Development of Chinese duplex stainless steel in recent years, J. Iron Steel Res. 24 (2017) 121-130.

DOI: 10.1016/s1006-706x(17)30018-3

[5] S. Hertzman, B. Brolund, P.J. Ferreira, An experimental and theoretical study of heat-affected zone austenite reformation in three duplex stainless steels, Metall. Mater. Trans. A 28 (1997) 277-285.

DOI: 10.1007/s11661-997-0130-6

[6] V.A. Hosseini, M.A.V. Bermejo, J. Gårdstam, K. Hurtig, L. Karlsson, Influence of multiple thermal cycles on microstructure of heat-affected zone in TIG-welded super duplex stainless steel, Weld World 60 (2016) 233-245.

DOI: 10.1007/s40194-016-0300-5

[7] H. Tan, Y. Jiang, B. Deng, T. Sun, J. Xu, J. Li, Effect of annealing temperature on the pitting corrosion resistance of super duplex stainless steel UNS S32750, Mater. Charact. 60 (2009) 1049-1054.

DOI: 10.1016/j.matchar.2009.04.009

[8] V.A. Hosseinil, M.A.V. Bermejo, J. Gardstam, K.Hurtig, L. Karlsson, Influence of multiple thermal cycles on microstructure of heat-affected zone in TIG-welded super duplex stainless steel, Weld World 60 (2016) 233-245.

DOI: 10.1007/s40194-016-0300-5

[9] H. Sieurin, R. Sandström, Austenite reformation in the heat-affected zone of duplex stainless steel 2205, Mater. Sci. Eng. A 48 (2006) 250-256.

DOI: 10.1016/j.msea.2005.11.025

[10] E. Taban, E. Kaluc, Welding behaviour of Duplex and Superduplex Stainless Steels using Laser and Plasma ARC Welding processes, Weld World 55 (2011) 48-57.

DOI: 10.1007/bf03321307

[11] A.J. Ramirez, J.C. Lippold, S.D. Brandi, The relationship between chromium nitride and secondary austenite precipitation in duplex stainless steels, Metall. Mater. Trans. A 34 (2003) 1575-1597.

DOI: 10.1007/s11661-003-0304-9

[12] H.S. Wang, Effect of Welding Variables on Cooling Rate and Pitting Corrosion Resistance in Super Duplex Stainless Weldments, Mater. Trans. 46 (2005) 593-601.

DOI: 10.2320/matertrans.46.593

[13] J.Y. Maetz, T. Douillard, S. Cazottes, C. Verdu, X. Kléber, M23C6 carbides and Cr2N nitrides in aged duplex stainless steel: A SEM, TEM and FIB tomography investigation, Micron. 84 (2016) 43-53.

DOI: 10.1016/j.micron.2016.01.007

[14] P. Paulraj, R. Garg, Effect of intermetallic phases on corrosion behavior and mechanical properties of duplex stainless steel and super duplex stainless steel, Adv. Sci. Tech. 9 (2015) 87-105.

DOI: 10.12913/22998624/59090