Carbide precipitation in a low alloyed steel during aging studied by atom probe tomography and thermodynamic modeling
Artikel i vetenskaplig tidskrift, 2021

Carbide precipitation in martensitic low alloyed steels contributes to the mechanical properties through precipitation hardening. A high number density of carbides is desired to maximize the hardening effect, which is achieved through the precipitation of carbides on the dislocations in the martensitic structure. In this study, the nucleation, growth, and coarsening of vanadium and molybdenum carbides during aging at 600◦C for periods up to four weeks were investigated. The work covers characterization with atom probe tomography, which showed that the nucleation of V and Mo rich MC/M2C carbides takes place on dislocations. The growth of these carbides proceeds by the diffusion of elements to the dislocations, which has been modeled using Dictra software, confirming the rate of the reaction as well as the depletion of carbide formers in the matrix. For longer aging times, particle coarsening will decrease the number density of particles with a transition from dislocation-based carbides to separate rounded carbides.

Carbides

Thermodynamic modeling

Low-alloyed steel

Precipitation

Aging

Atom probe tomography

Författare

Mattias Thuvander

Chalmers, Fysik, Mikrostrukturfysik

Hans Magnusson

Swerim AB

Ulrika Borggren

SSAB AB

Metals

2075-4701 (eISSN)

Vol. 11 12 2009

Framtidens materialdesign

VINNOVA (2015-06474), 2016-04-01 -- 2019-08-31.

Ämneskategorier

Fysikalisk kemi

Materialkemi

Metallurgi och metalliska material

Infrastruktur

Chalmers materialanalyslaboratorium

Styrkeområden

Materialvetenskap

DOI

10.3390/met11122009

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Senast uppdaterat

2022-03-28