SCC of austenitic alloys in PWR water simulated with molecular dynamics

• Autorzy: Arnoux P.
• Języki publikacji: EN

Abstrakty

EN

The aim of this work is to propose a model to explain the microscopic mechanism of Stress Corrosion Cracking (SCC) in PWR water of stainless steels or nickel base alloys. Molecular Dynamics (DM) simulations on bicrystal or Ni have been carried out with hydrogen at the grain boundary (GB) (Eta 5). Two temperatures have been tested : IK and 562K. Literature reports that Transmission Electronic Microscopy analysis at the crack tip (CT) reveals the presence of an oxide. As this oxide bas a 15% lattice parameter higher than the alloy, it induces a pressure on the crack lips (CL). The role of this pressure and hydrogen will be particularly addressed. Simulations without hydrogen nor pressure on the CL shows ductile fracture with blunting of the CT. On the contrary, when a compressive strength is applied on the CL and hydrogen is present at the GB, the rupture is brittle with a GB cleavage. A SCC model bas been inferred from these results.

Słowa kluczowe

EN

nickel-base alloy; austenitic stainless steel; stress corrosion cracking; hydrogen

• Wydawca: Politechnika Gdańska
• Czasopismo: Advances in Materials Science
• Rocznik: 2007
• Tom: Vol. 7, nr 1(11)
• Strony: 6--12
• Opis fizyczny: Bibliogr. 4 poz., rys., tab.

Twórcy

autor

Arnoux P.

• CEA Saclay : SCCME/LECA Gif sur Yvette, France

Bibliografia

• [1] L. E. Thomas and S.M. Bruemmer. Analytical Transmission Electron Microscopy Characterization of Stress Corrosion Cracks an Irradiated Type 316 Stainless Steel Core Component. Proc. of the International Symposium Fontevraud V 23-27 September 2002.
• [2] Ni-Al-H EAM potential from Baskes et al. Atomistic Calculations of Hydrogen Interactions with Ni3AI Grain Boundaries and Ni/Ni3AI Interfaces. Sandia Report SAND94-8741, January 1995. Created by Xianwei Sha, 08/19/97.
• [3] XMD was written by Jon Rifkin [e-mail] at the University of Connecticut. Many useful ideas were contributed by Philip C. Clapp, Charlotte Becquart, Elena Sevilla, Zeng Pei, Rongde Ge, Sha Xianwei, Wang Xianowei and others. http://xmd.sourceforge.net/doc.html
• [4] Sih G. C. and Liebowitz H.: Fracture: An Advanced Treatise. H. Liebowitz [Ed.], Academic Press, New York and London, 1968. Vol. 2, p. 125.