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2014-10-14 - Colloque/Présentation - communication orale - Anglais - 1 page(s)

Delaunois Fabienne , Tshimombo Alexis, Stanciu Victor Ioan , Vitry Véronique , "Contribution of acoustic emission to the monitoring of stress corrosion cracking of stainless steel: identification of the phases of the corrosion process and use of an accelerated test." in Materials Science & Technology 2014, Pittsburgh, USA, 2014

  • Codes CREF : Métallurgie (DI2310), Electrochimie hautes et basses températures (DI1326), Corrosion des matériaux (DI2114)
  • Unités de recherche UMONS : Métallurgie (F601)
  • Instituts UMONS : Institut de Recherche en Science et Ingénierie des Matériaux (Matériaux)
  • Centres UMONS : Ingénierie des matériaux (CRIM)

Abstract(s) :

(Anglais) Stress corrosion cracking of stainless steel has been extensively studied and the involved mechanisms are well known. However, detection and control of this phenomenon in industrial applications, and its prediction, are still a major problem. Acoustic emission methods were used to characterize and monitor SCC of austenitic stainless steel. The signals emitted during the three stages of SCC (germination of pitting and the initiation of its propagation (I), propagation of pitting and cracks initiation (II) and cracks propagation (III)) were identified. Separation of the acoustic emission signals due to corrosion from those due the applied stress was carried out by an accelerated SCC test that was carried out a 3% NaCl aqueous solution at 60°C. During the accelerated test, the evolution of electric potential and tensile strength was followed. The effect of cyclic loading of the specimen, considering the speed of recovery of the passive layer, was also considered.