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Microstructure and mechanical behavior indissimilar 13Cr/2205stainless steel welded pipes

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Materials and Design

Volume 85, Issue 85, 2015, Pages 221-229

Microstructure and mechanical behavior in dissimilar 13Cr/2205stainless steel welded pipes

K. Bettahar, M. BOUABDALLAH, R. Badji, M. Gaceb, C. KAHLOUN, B.

BACROIX

Abstract: Thiswork aims to investigate the microstructure and themechanical behavior of dissimilar 13Cr Supermartensitic/2205 Duplex stainless steelwelded pipes. A wide variety ofmicrostructures resulting fromboth solidification andsolid state transformation is induced by the fusion welding process across the weld joint. The tensile tests showthat the deformation process of the dissimilarweld joint ismainly controlled by the two basematerials: the duplexsteel at the beginning of the deformation and the supermartensitic one at its end. This is confirmed by the microtensiletests showing the overmatching effect of the weld metal. The fatigue tests conducted on dissimilar weldedspecimens led us to conclude that the weld metal is considered as a weak link of the weld joint in the high cyclefatigue regime. This is supported by its lower fatigue limit compared to the two basematerials that exhibit a similarfatigue behavior.

Keywords : Dissimilar welding, microstructure, Tensile testing, High cycle fatigue

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