Observation of Precipitation Evolution in Fe-Ni-Mn-Ti-Al Maraging Steel by Atom Probe Tomography

Authors

E V. Pereloma, University of WollongongFollow
R.A. Stohr, Monash University
M.K Miller, Oak Ridge Nat Lab, USA
S P. Ringer, University of Sydney

RIS ID

31440

Publication Details

Pereloma, E., Stohr, R., Miller, M. Ringer, S. (2009). Observation of Precipitation Evolution in Fe-Ni-Mn-Ti-Al Maraging Steel by Atom Probe Tomography. Metallurgical and Materials Transactions A - Physical Metallurgy and Materials Science, 40A (13), 3069-3075.

Abstract

We describe the full decomposition sequence in an Fe-Ni-Mn-Ti-Al maraging steel during isothermal annealing at 550 °C. Following significant pre-precipitation clustering reactions within the supersaturated martensitic solid solution, (Ni,Fe)₃Ti and (Ni,Fe)₃(Al,Mn) precipitates eventually form after isothermal aging for ~60 seconds. The morphology of the (Ni,Fe)₃Ti particles changes gradually during aging from predominantly plate-like to rod-like, and, importantly, Mn and Al were observed to segregate to these precipitate/matrix interfaces. The (Ni,Fe)₃(Al,Mn) precipitates occurred at two main locations: uniformly within the matrix and at the periphery of the (Ni,Fe)₃Ti particles. We relate this latter mode of precipitation to the Mn-Al segregation.