Atom probe tomography investigation of assisted precipitation of secondary hardening carbides in a medium carbon martensitic steels

Frédéric Danoix (1) , Raphaële Danoix (1) , J. Akre (1) , A. Grellier (2) , Denis Delagnes (3)

1 GPM - Groupe de physique des matériaux
2 Aubert & Duval
3 ICA - Institut Clément Ader

A medium carbon martensitic steel containing nanometer scale secondary hardening carbides and intermetallic particles is investigated by field ion microscopy and atom probe tomography. The interaction between the concomitant precipitations of both types of particles is investigated. It is shown that the presence of the intermetallic phase affects the nucleation mechanism and the spatial distribution of the secondary hardening carbides, which shifts from heterogeneous on dislocations to heterogeneous on the intermetallic particles.

Mots clés: three-dimensional atom probe (3DAP); Carbides; field ion microscopy (FIM); heterogeneous nucleation of phase transformations; martensitic steels

Domaines: Sciences de l'ingénieur [physics]

Frédéric Danoix, Raphaële Danoix, J. Akre, A. Grellier, Denis Delagnes. Atom probe tomography investigation of assisted precipitation of secondary hardening carbides in a medium carbon martensitic steels. Journal of Microscopy, 2011, 244 (3), pp.305-310. ⟨10.1111/j.1365-2818.2011.03537.x⟩. ⟨hal-01715078⟩