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Braham, Chedly
Universite Pierre et Marie Curie - Paris 6 (France); Electricite de France, Laboratoire de Mecanique Corrosion, centre E.D.F. des Renardieres, departement 'Etudes des Materiaux' (France); Laboratoire de Metallurgie, Ecole Nationale Superieure d'Arts et Metiers de Paris - E.N.S.A.M., Paris (France)1984
Universite Pierre et Marie Curie - Paris 6 (France); Electricite de France, Laboratoire de Mecanique Corrosion, centre E.D.F. des Renardieres, departement 'Etudes des Materiaux' (France); Laboratoire de Metallurgie, Ecole Nationale Superieure d'Arts et Metiers de Paris - E.N.S.A.M., Paris (France)1984
AbstractAbstract
[en] This research thesis reports the analysis of the relationships between cold working, stresses and susceptibility to stress corrosion (under applied or residual stresses) of a steady austenitic stainless steel (Z2 CND 17-12 or 316L) in a boiling solution of MgCl2 at 44 pc. The mechanical condition of sample surface is precisely defined by X ray diffraction. Corrosion tests are performed under uniaxial applied tensile stress. They reveal a very low cracking critical threshold which is sensitive to the level of initial residual stresses, but not much sensitive to initial cold working by tension. However, in the case of corrosion tests under residual stresses obtained by elastoplastic bending on specimens previously deformed under tension, the threshold is notably higher, and cold working rate is then an extremely important factor. Depending on the reached level, the effect can be beneficial or detrimental
[fr]
Dans cette etude, nous analysons les relations entre l'ecrouissage, les contraintes et la susceptibilite a la corrosion sous contraintes (appliquees ou residuelles) d'un acier inoxydable austenitique stable Z2 CND 17-12 (316 L), dans une solution bouillante de MgCl2 a 44 pc. L'etat mecanique a la surface des echantillons est soigneusement defini par diffraction X. Les essais de corrosion effectues sous charge uniaxiale de traction appliquee, revelent un seuil critique de fissuration tres bas (80 MPa) mais sensible au niveau des contraintes residuelles initiales et peu a l'ecrouissage initial obtenu par traction prealable. En revanche, dans le cas des essais de corrosion sous contraintes residuelles obtenues par flexion elastoplastique sur des echantillons deformes prealablement par traction, on trouve un seuil nettement plus eleve, toujours superieur a 150 MPa. Dans ce cas le taux de l'ecrouissage est un facteur extremement important. Selon le niveau atteint l'effet peut etre benefique ou nefaste. (auteur)Original Title
Influence de l'etat mecanique de la surface d 'un acier inoxydable austenitique sur sa susceptibilite a la corrosion sous contraintes
Primary Subject
Source
26 Oct 1984; 152 p; 113 refs.; Available from the INIS Liaison Officer for France, see the 'INIS contacts' section of the INIS website for current contact and E-mail addresses: http://www.iaea.org/inis/contacts/; These Docteur Ingenieur
Record Type
Report
Literature Type
Thesis/Dissertation
Report Number
Country of publication
ALKALINE EARTH METAL COMPOUNDS, ALLOYS, AUSTENITIC STEELS, CARBON ADDITIONS, CHEMICAL REACTIONS, CHLORIDES, CHLORINE COMPOUNDS, CHROMIUM ALLOYS, CHROMIUM STEELS, CHROMIUM-MOLYBDENUM STEELS, CHROMIUM-NICKEL STEELS, CHROMIUM-NICKEL-MOLYBDENUM STEELS, COHERENT SCATTERING, CORROSION, CORROSION RESISTANT ALLOYS, DIFFRACTION, FABRICATION, HALIDES, HALOGEN COMPOUNDS, HARDENING, HEAT RESISTANT MATERIALS, HEAT RESISTING ALLOYS, HIGH ALLOY STEELS, IRON ALLOYS, IRON BASE ALLOYS, LOW CARBON-HIGH ALLOY STEELS, MAGNESIUM COMPOUNDS, MAGNESIUM HALIDES, MATERIALS, MATERIALS WORKING, MOLYBDENUM ALLOYS, NICKEL ALLOYS, SCATTERING, STAINLESS STEELS, STEEL-CR17NI12MO3-L, STEELS, STRESSES, SURFACE TREATMENTS, TESTING, TRANSITION ELEMENT ALLOYS
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