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Microstructure and Mechanical Behavior in Dissimilar SAF 2205/API X52 Welded Pipes

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Abstract

The welding of a duplex stainless steel SAF 2205 DSS (UNS 31803) and high strength low alloy steel API X52 by shielded metal arc welding process was conducted using two different filler metals, the duplex E2209 and austenitic E309 grade. The microstructures of the dissimilar metal joints have been investigated by optical microscopy, scanning electron microscopy, energy-dispersive spectroscopy (EDS) and X-ray diffraction. EDS analysis at the interface X52 weld metal showed an evident gradient variation of Cr and Ni between boundaries of fusion and type II, where the highest hardness value was recorded. Tensile strength and toughness values of the weld metal produced by E309 electrode are slightly higher than those of the weld metal produced by E2209 electrode. Potentiodynamic polarization tests of different regions of the welded joints evaluated in 3.5% NaCl solution exhibit a high corrosion resistance of both weld metals.

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Acknowledgments

The authors gratefully acknowledge the Research Center in Industrial Technologies (CRTI) and express their sincere thanks to the Laboratory of Science and Materials Engineering (LSGM), for technical support provided in performing SEM–EDS, DRX and electrochemical studies.

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Authors and Affiliations

  1. Research Center in Industrial Technologies, CRTI, P.O. Box 64, 16014, Cheraga, Algiers, Algeria

    Brahim Belkessa, Naima Ouali & Billel Cheniti

  2. Laboratory of Sciences and Materials Engineering, LSGM, FGMGP, University of Sciences and Technology Houari Boumediene, BP 32 El Alia, Bab Ezzouar, 16111, Algiers, Algeria

    Brahim Belkessa & Djamel Miroud

Authors
  1. Brahim Belkessa
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  2. Djamel Miroud
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  3. Naima Ouali
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Correspondence to Brahim Belkessa.

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Available online at http://link.springer.com/journal/40195

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Belkessa, B., Miroud, D., Ouali, N. et al. Microstructure and Mechanical Behavior in Dissimilar SAF 2205/API X52 Welded Pipes. Acta Metall. Sin. (Engl. Lett.) 29, 674–682 (2016). https://doi.org/10.1007/s40195-016-0428-8

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  • DOI: https://doi.org/10.1007/s40195-016-0428-8

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