Microstructure and Corrosion Resistance of Dissimilar Weld-Joints between Duplex Stainless Steel 2205 and Austenitic Stainless Steel 316L

doi:10.1016/j.jmst.2015.11.021

J. Mater. Sci. Technol. ›› 2016, Vol. 32 ›› Issue (3): 282-290.DOI: 10.1016/j.jmst.2015.11.021

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Microstructure and Corrosion Resistance of Dissimilar Weld-Joints between Duplex Stainless Steel 2205 and Austenitic Stainless Steel 316L

Aboulfazl Moteshakker, Iman Danaee

Abadan Faculty of Petroleum Engineering, Petroleum University of Technology, Abadan, Iran

收稿日期:2015-04-03 修回日期:2015-05-04 出版日期:2016-03-10

Microstructure and Corrosion Resistance of Dissimilar Weld-Joints between Duplex Stainless Steel 2205 and Austenitic Stainless Steel 316L

Aboulfazl Moteshakker, Iman Danaee

Abadan Faculty of Petroleum Engineering, Petroleum University of Technology, Abadan, Iran

Received:2015-04-03 Revised:2015-05-04 Online:2016-03-10
Contact: Ph.D.; Tel.: +98 631 4429937; Fax: +98 631 4426201.E-mail address: danaee@put.ac.ir (I. Danaee).

摘要/Abstract

摘要： The microstructure and corrosion resistance of dissimilar weld-joints between stainless steel SAF 2205 and stainless steel AISI 316L were investigated. Welding was accomplished by different types of welding wires AWS ER 347, AWS ER 316L and AWS ER 309L. To verify soundness of welded samples, nondestructive tests were performed. Metallographic samples were prepared from cross-section areas of weld-joints to investigate microstructure of different regions of weld-joints by optical microscopy and scanning electron microscopy. Corrosion resistance of weld-joints was evaluated in NaCl solution by potentiodynamic polarization and electrochemical impedance techniques. In the weld metal AWS ER 347, the brittle sigma phase was created, resulting in the decrease of weld-joint corrosion resistance. According to the results of metallurgical investigations and corrosion tests, welding wire AWS ER 309L was suitable for welding duplex stainless steel (SAF 2205) to austenitic stainless steel (AISI 316L) by gas tungsten arc welding (GTAW) process.

关键词: Duplex stainless steel, Joint welding, Microstructure, Polarization, Impedance

Abstract: The microstructure and corrosion resistance of dissimilar weld-joints between stainless steel SAF 2205 and stainless steel AISI 316L were investigated. Welding was accomplished by different types of welding wires AWS ER 347, AWS ER 316L and AWS ER 309L. To verify soundness of welded samples, nondestructive tests were performed. Metallographic samples were prepared from cross-section areas of weld-joints to investigate microstructure of different regions of weld-joints by optical microscopy and scanning electron microscopy. Corrosion resistance of weld-joints was evaluated in NaCl solution by potentiodynamic polarization and electrochemical impedance techniques. In the weld metal AWS ER 347, the brittle sigma phase was created, resulting in the decrease of weld-joint corrosion resistance. According to the results of metallurgical investigations and corrosion tests, welding wire AWS ER 309L was suitable for welding duplex stainless steel (SAF 2205) to austenitic stainless steel (AISI 316L) by gas tungsten arc welding (GTAW) process.

Key words: Duplex stainless steel, Joint welding, Microstructure, Polarization, Impedance

Aboulfazl Moteshakker, Iman Danaee. Microstructure and Corrosion Resistance of Dissimilar Weld-Joints between Duplex Stainless Steel 2205 and Austenitic Stainless Steel 316L[J]. J. Mater. Sci. Technol., 2016, 32(3): 282-290.

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Microstructure and Corrosion Resistance of Dissimilar Weld-Joints between Duplex Stainless Steel 2205 and Austenitic Stainless Steel 316L

Microstructure and Corrosion Resistance of Dissimilar Weld-Joints between Duplex Stainless Steel 2205 and Austenitic Stainless Steel 316L

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