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A Mechanical Study of T91 Embrittlement by Liquid Lead-bismuth Eutectic

Published online by Cambridge University Press:  26 February 2011

Zehoua Hamouche ,
Thierry AUGER  and
Ivan GUILLOT
Zehoua Hamouche
Affiliation:
[email protected], C.E.C.M., Val de marne, 15, Rue Georges Urbain, VITRY SUR SEINE, 94407, France, +33 156703088, +33 146750433
Thierry AUGER
Affiliation:
[email protected], CECM-CNRS UPR2801, 15 Rue Georges Urbain, VITRY SUR SEINE, 94407, France
Ivan GUILLOT
Affiliation:
[email protected], CECM-CNRS UPR2801, 15 Rue Georges Urbain, VITRY SUR SEINE, 94407, France
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Abstract

The susceptibility of liquid metal embrittlement of the T91 martensitic steel is investigated from slow deformation rate (6.67x10-8 m.s-1) to high deformation rate (6.67x10-3 m.s-1), using a Center Cracked in Tension geometry. Brittle fracture, characterized by elongated river cracks on all the fracture surfaces, indicates that T91 is sensitive to the Embrittlement by LBE. This embrittlement effect is very marked at the low deformation rate (~10-5 mm.s-1). A ductile-brittle transition is observed in the high strain rate range investigated. In this transition regime, there is a competition between the growth of dimples and the cracking induced by the liquid metal. Ductility recovery is complete at the highest investigated displacement rate. This dependence of T91/LBE susceptibility to LME on the displacement rate and the brittle to ductile transition at high strain rate is confirmed by a fracture mechanics analysis.

Keywords

embrittlementfracturemetal
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 981: Symposium JJ – Structural and Refractory Materials for Fusion and Fission Technologies , 2006 , 0981-JJ07-02
Copyright
Copyright © Materials Research Society 2007

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References

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