Influence of P and C intergranular segregation during manufacturing and ageing on the fracture toughness of nuclear pressure vessel steels

Antoine Andrieu (1, 2) , André Pineau (1) , Pierre Joly (2) , François Roch (2) , David Ryckelynck (1)

1 MAT - Centre des Matériaux
2 AREVA

Mechanical tests on Charpy and CT specimens of a low alloy MnNiMo steel under two conditions, as received and thermally aged, revealed a shift of the ductile to brittle transition temperature. In this paper, an approach based on the combination of local fracture mechanics and segregation kinetics is proposed in order to describe this shift.

Mots clés: Low alloy steels; thermal ageing; fracture; DBTT shift; intergranular; Phosphorus

Domaines: Sciences de l'ingénieur [physics]; Matériaux

Antoine Andrieu, André Pineau, Pierre Joly, François Roch, David Ryckelynck. Influence of P and C intergranular segregation during manufacturing and ageing on the fracture toughness of nuclear pressure vessel steels. 20th European conference on fracture (ECF 20), Jun 2014, Trondheim, Norway. pp.655-660, ⟨10.1016/j.mspro.2014.06.108⟩. ⟨hal-01053644⟩