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Microstructure and Mechanical Behavior inDissimilar SAF2205/API X52 Welded Pipes

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Acta Metallurgica Sinica (English letters)

Volume 29, Issue 7, 2016, Pages 674-682

Microstructure and Mechanical Behavior in Dissimilar SAF2205/API X52 Welded Pipes

Brahim BELKESSA, Djamel Miroud, Naima Ouali, Billel CHENITI

Abstract: The welding of a duplex stainless steel SAF 2205 DSS (UNS 31803) and high strength low alloy steel API X52by shielded metal arc welding process was conducted using two different filler metals, the duplex E2209 and austeniticE309 grade. The microstructures of the dissimilar metal joints have been investigated by optical microscopy, scanningelectron microscopy, energy-dispersive spectroscopy (EDS) and X-ray diffraction. EDS analysis at the interface X52 weldmetal showed an evident gradient variation of Cr and Ni between boundaries of fusion and type II, where the highesthardness value was recorded. Tensile strength and toughness values of the weld metal produced by E309 electrode areslightly higher than those of the weld metal produced by E2209 electrode. Potentiodynamic polarization tests of differentregions of the welded joints evaluated in 3.5% NaCl solution exhibit a high corrosion resistance of both weld metals.

Keywords : Dissimilar metals welding, 2205 Duplex stainless steel, API X52 HSLA steel, Heat affected zone, mechanical properties

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