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Influence of the ferrite rate on the tenacity of a welded joint in austenitic stainless steel: Experimental study and numeric modelling

type de publication      article dans une revue internationale avec comité de lecture
date de publication 2009
auteur(s) Bouchouicha B.; Zemri M.; Benguediab Mohamed; Imad Abdellatif
journal (abréviation) Computational Materials Science (Comput Mater Sci)
volume (numéro) 45 (2)
pages 336 – 341
résumé This work is about the experimental and numerical study of the global mechanical behavior of a welded joint using TIG welding process (tungsten inert gas) of austenitic stainless steels 316L. Generally, the mechanical properties characteristics of this type of welded joint depend mainly on two parameters: the quality of weld metal and the quality of gaseous protection.
Three qualities of molten metal: (UP-CNM 18 16), (SG-X2/CNM 19 12) and (SG-X12/CNM 19 10) were used. On each of the configurations, mechanical tests of characterization were carried out: tensile test, impact strength, rupture and of folding. In order to simulate the holding of corrosion of the weld, the specimens were emerged in a device corrosion test during one week.
The observation made and the results obtained from different mechanical tests had been correlated in order to propose for welding of austenitic stainless steels 316L containing a high concentration of chrome (Cr) and lower concentration of nickel (Ni) in order that a fraction of ferrite can be stabilized during solidification. There is, also, the use of welded metal combination containing 30% of ferrite associated to helium as protection gas. The weld joint obtained is austenito-ferritie, giving a structure with content in adequate ferrite of 15%, this leads to the expected mechanical characteristics which is the closest to the band of scatter of the base metal.
mots clés Welding; Ferrite; Toughness; Austenite; Austenitic stainless steel 316L
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