Mechanical behaviour of SSRT specimens optimized for IGSCC concerns

Julien Deleume (1) , Dominique Poquillon (1) , Véronique Garat , Jean-Marc Cloué , Eric Andrieu (1)

1 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

Simulating testing conditions leading to evaluate the intergranular stress corrosion cracking sensitivity of structural alloys is crucial to estimate the lifetime of in-service components. Former studies have pointed out that a simple modification of the design of slow strain rate tensile specimens was particularly convenient for evaluating the susceptibility to intergranular stress corrosion cracking of nickelbase alloys. The aim of the present work is to characterize and model the mechanical behaviour of such specimens. Validation of proposed modelling relies mainly on tensile tests carried on specimens equipped with strain gages. One of the striking results is that, for a given displacement rate of the heads of the specimen, a much slower strain rate can be obtained locally in comparison with the strain rate of an equivalent smooth specimen.

Mots clés: A. Nickel; A. Superalloys; B. Modelling studies; C. Effects of strain; C. Stress corrosion

Domaines: Matériaux

Julien Deleume, Dominique Poquillon, Véronique Garat, Jean-Marc Cloué, Eric Andrieu. Mechanical behaviour of SSRT specimens optimized for IGSCC concerns. Corrosion Science, 2008, 50 (3), pp.737-743. ⟨10.1016/j.corsci.2007.10.007⟩. ⟨hal-03590983⟩