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 MSA  Vol.9 No.2 , February 2018
Influence of MIG/MAG Welding Process on Mechanical and Pitting Corrosion Behaviors on the Super-Duplex Stainless Steel SAF 2507 Welded Joints
Abstract: The main objective of this research is to better understand the correlation between the constituent phases presented in the super-duplex steel SAF 2507 when it is under welding process by arc shielding gas MIG-MAG (Metal Inert Gas-Metal Active Gas). Conventional short circuit transfer and derivative STT (Surface Tension Transfer) using the 2594 welding wire as a filler metal and the effects on welding power in hardness, toughness and pitting corrosion are considered here. The results showed that the welding energy (Ew) changed the α/γ-phase’s balance and occasionally formed σ-phase in ferrite grain boundaries which led to changes in hardness, toughness and pitting corrosion resistance in molten zone (MZ), heat activated zone (HAZ) and metal base regions (MB). Furthermore, the increased amount of γ-phase improved the pitting corrosion resistance index (PRENγ) mainly in the MZ. This is due to decrease of α-phase fraction and formation of coarser grains, for higher welding energy. The toughness in the MZ decreased with less formation of γ-phase, coalescence of ferritic grains and localized formation of σ-phase, raising the hardness in the HAZ when the welding energy was lower.
Cite this paper: Lopes, B. , Rodrigues, S. , Silva, E. , Reis, G. , Martins, W. , Damascena, J. and Leal, V. (2018) Influence of MIG/MAG Welding Process on Mechanical and Pitting Corrosion Behaviors on the Super-Duplex Stainless Steel SAF 2507 Welded Joints. Materials Sciences and Applications, 9, 228-245. doi: 10.4236/msa.2018.92015.
References

[1]   Solomon, H.D. and Koch, E.F. (1979) High Temperature Precipitation of α' in a Multicomponent Duplex Stainless Steel. Scripta Metallurgica, 10, 971-974.
https://doi.org/10.1016/0036-9748(79)90331-4

[2]   Baeslack, W. and Lippold, J.C. (1988) Phase Transformation Behavior in Duplex Stainless Steels Weldments. Metal Construction, 20, 26-31.

[3]   Charles, J. (1991) Super Duplex Stainless Steels: Structure and Properties. Duplex Stainless Steels’91, Les Editions de Physique, Vol. 1, Les Ulis Cedex, France.

[4]   Chail, G. and Kangas, P. (2016) Super and Hyper Duplex Stainless Steels: Structures, Properties and Applications. Procedia Structural Integrity, 2, 1755-1762.
https://doi.org/10.1016/j.prostr.2016.06.221

[5]   Davison, R.M. and Redmond, J.D. (1991) A Guide to Using Duplex Stainless Steels. Materials & Design, 12, 187-192.
https://doi.org/10.1016/0261-3069(91)90162-W

[6]   Rauta, R.P., Rodrigues, S.F., Leal, V.S., Reis, G.S., Aranas Jr., C. and Ferraresi, V.A. (2016) Influence of Pushing and Pulling the Electrode Procedure and Addition of Second Layer of Welding on the Wear in Hardfacing of Fe-Cr-C. Materials Research, 19, 1193-1200.
https://doi.org/10.1590/1980-5373-MR-2016-0230

[7]   Brandi, S.D. (2003) Some Aspects of Weldability and Jointability of Duplex Stainless Steels. Materials Science Forum, 426-432, 4063-4068.
https://doi.org/10.4028/www.scientific.net/MSF.426-432.4063

[8]   Garfias-Mesias, L.F., Syke, J.M. and Tuck, C.D.S. (1996) The Effect of Phase Compositions on the Pitting Corrosion of 25 Cr Duplex Stainless Steel in Chloride Solutions. Corrosion Science, 38, 1319-1330.
https://doi.org/10.1016/0010-938X(96)00022-4

[9]   Syed, R., Jiang, W., Wang, C. and Iqbal Sabir, M. (2015) Fatigue Life of Stainless Steel 304 Enhancement by Addition of Multi-Walled Carbon Nanotubes (MWCNTs). Journal of Mechanical Science and Technology, 29, 291-296.
https://doi.org/10.1007/s12206-014-1235-7

[10]   Kobayashi, D.Y. and Wolynec, S. (1999) Evaluation of the Low Corrosion Resistant Phase Formed during the Sigma Phase Precipitation in Duplex Stainless Steels. Materials Research, 2, 239-247.
https://doi.org/10.1590/S1516-14391999000400002

[11]   Lee, K.M., Cho, H.S. and Choi, D.C. (1999) Effect of Isothermal Treatment of SAF 22005 Duplex Stainless Steel on Migration of δ/γ Interface Boundary and Growth of Austenite. Journal of Alloys and Compounds, 285, 156-161.
https://doi.org/10.1016/S0925-8388(99)00014-6

[12]   Ramirez, A.J., Lippod, J.C. and Brandi, S.D. (2003) The Relationship between Chromium Nitride and Secondary Austenite Precipitation in Duplex Stainless Steels. Metallurgical and Materials Transactions, 43A, 1575-1597.
https://doi.org/10.1007/s11661-003-0304-9

[13]   Gunn, R.N. (2003) Duplex Stainless Steels. Microstructure, Properties and Applications. Abington Publishing, Cambridge, 204.

[14]   Magnabosco, R. and Alonso-Falleiros, N. (2005) Pit Morphology and Its Relation to Microstructure of 850°C Aged Duplex Stainless Steel. Corrosion, 61, 130-136.
https://doi.org/10.5006/1.3278167

[15]   Jia, D.B., Dai, W.B., Tang, G.P., Xu, C.Z., Tian, X.Z. and Yu, K.J. (2017) Improvement of Pitting Corrosion Resistance of Stainless Steel by Electric Current Pulse. Materials Science and Technology, 33, 1417-1420.
https://doi.org/10.1080/02670836.2016.1277092

[16]   Sato, Y.S., Nelson, T.W., Sterling, C.J., Steel, R.J. and Pettersson, C.O. (2005) Microstructure and Mechanical Properties of Friction Stir Welded SAF 2507 Super Duplex Stainless Steel. Materials Science and Engineering A, 395, 376-384.
https://doi.org/10.1016/j.msea.2005.02.054

[17]   Gideon, B., Ward, L. and Biddle, G. (2008) Duplex Stainless Steel Welds and Their Susceptibility to Intergranular Corrosion. Journal of Minerals & Materials Characterization & Engineering, 7, 247-263.
https://doi.org/10.4236/jmmce.2008.73019

[18]   Wang, J., Lu, M., Zhang, L., Chang, W., Xu, L. and Hu, L. (2012) Effect of Welding Process on the Microstructure and Properties of Dissimilar Weld Joints between Low Alloy Steel and Duplex Stainless Steel. International Journal of Minerals, Metallurgy and Materials, 19, 518-524.
https://doi.org/10.1007/s12613-012-0589-z

[19]   Ghosh, S.K. and Mondal, S. (2008) High Temperature Ageing Behavior of a Duplex Stainless Steel. Materials Characterization, 59, 1776-1783.
https://doi.org/10.1016/j.matchar.2008.04.008

[20]   Pohl, M., Stoz, O. and Glogowski, T. (2007) Effect of Intermetallic Precipitations on the Properties of Duplex Stainless Steels. Materials Characterization, 58, 65-71.
https://doi.org/10.1016/j.matchar.2006.03.015

[21]   Badji, R., Bouabdallah, M., Bacroix, B., Kahloun, C., Belkessa, B. and Maza, H. (2008) Phase Transformation and Mechanical Behavior in Annealed 2205 Duplex Stainless Steel Welds. Materials Characterization, 59, 447-453.
https://doi.org/10.1016/j.matchar.2007.03.004

[22]   Brandi, S.D., Silveira, L.M.Y. and Vasconcellos, D.L.B. (2010) Aplicacao da norma ASTM A923-Pratica A para identificacao de fases intermetalicas em junta soldada de aco inoxidavel superduplex UNS 32750. Revista Escola de Minas, 61, 153-158.
https://doi.org/10.1590/S0370-44672010000100026

[23]   ASTM E-23-05 (2005) Standard Test Methods for Notched Bar Impact Testing of Metallic Materials. ASTM, West Conshohocken.

[24]   ASTM G 48-00 (2000) Standard Test Methods for Pitting and Crevice Corrosion Resistance of Stainless Steel and Related Alloys by Use of Ferric Chloride Solution. ASTM, West Conshohocken.

[25]   Nascimento, C.C.F., Rodrigues, S.F., Morais, V.M. and Vilarinho, L.O. (2016) Methodology for Corrosion Evaluation in HAZ of 11%-Cr Ferritic Stainless Steel. Journal of Mechanical Science and Technology, 30, 3805-3811.
https://doi.org/10.1007/s12206-016-0743-z

[26]   Mohammed Asif, A., Shrikrishna, K.A., Sathiya, S. and Goel, S. (2015) The Impact of Heat Input on the Strength, Toughness, Microhardness, Microstructure and Corrosion Aspects of Friction Welded Duplex Stainless Steel Joints. Journal of Manufacturing Processes, 18, 92-106.
https://doi.org/10.1016/j.jmapro.2015.01.004

[27]   Santos, T.F.A., Marinho, R.R., Paes, M.T.P. and Ramirez, A.J. (2013) Microstructure Evaluation of UNS S32205 Duplex Stainless Steel Friction Stir Welds. Revista Escola de Minas, 66, 187-191.
https://doi.org/10.1590/S0370-44672013000200008

[28]   Ha, H.Y., Jang, M.H., Lee, T.H. and Moon, J. (2014) Interpretation of the Relation between Ferrite Fraction and Pitting Corrosion Resistance of Commercial 2205 Duplex Stainless Steel. Corrosion Science, 89, 154-162.
https://doi.org/10.1016/j.corsci.2014.08.021

[29]   Ha, H.Y., Jang, M.H., Lee, T.H. and Moon, J. (2015) Understand the Relationship between Phase Fraction and Pitting Corrosion Resistance of UNS S32750 Stainless Steel. Materials Characterization, 106, 338-345.
https://doi.org/10.1016/j.matchar.2015.06.019

[30]   Hong, J., Han, D., Tan, H., Li, J. and Jiang, Y. (2013) Evaluation of Aged Duplex Stainless Steel UNS S32750 Susceptibility to Intergranular Corrosion by Optimized Double Loop Electro-Chemical Potentiokinetic Reactivation Method. Corrosion Science, 68, 249-255.
https://doi.org/10.1016/j.corsci.2012.11.024

[31]   Lippold, J.C. and Kotecki, D.J. (2005) Welding Metallurgy and Weldability of Stainless Steels. Wiley, Hoboken.

[32]   Maetz, J.Y., Douillard, T., Cazottes, S., Verdu, C. and Kleber, X. (2016) M23C6 Carbides and Cr2N Nitrides in Aged Duplex Stainless Steel: A SEM, TEM and FIB Tomography Investigation. Micron, 84, 43-53.
https://doi.org/10.1016/j.micron.2016.01.007

[33]   Ramkumar, K.D., Thiruvengatam, G., Sudharsan, S.P., Mishra, A. and Sridhar, R. (2015) Effect of Optimal Weld Parameters in the Microstructure and Mechanical Properties of Autogenous Gas Tungsten Arc Weldments of Super-Duplex Stainless Steel UNS S32750. Materials and Design, 66, 356-365.
https://doi.org/10.1016/j.matdes.2014.10.084

[34]   Chehuan, T., Dreilich, V., Kioshy, S.A. and Mattos, O.R. (2014) Influence of Multipass Welding on the Corrosion Resistance of a Superduplex Stainless Steel Subjected to Pulsed Gas Metal Arc Welding. Corrosion Science, 86, 268-274.
https://doi.org/10.1016/j.corsci.2014.06.004

[35]   Ma, M., Ding, H., Tang, Z., Zhao, J., Jiang, Z. and Fan, G. (2016) Effects of Temperature and Strain Rate on Flow Behavior and Microstructural Evolution of Super Duplex Stainless Steel under Hot Deformation. Journal of Iron and Steel Research International, 23, 244-252.
https://doi.org/10.1016/S1006-706X(16)30041-3

 
 
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