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Journal of Materials Science
Erschienen in: Journal of Materials Science 16/2019

16.05.2019 | Metals & corrosion

Study of Nb non-equilibrium segregation at prior austenite grain boundary in welding using atom probe tomography and modeling

Erschienen in: Journal of Materials Science | Ausgabe 16/2019

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Abstract

The non-equilibrium segregation of Nb at prior austenite grain boundary (PAGB) induced by welding is experimentally investigated by means of atom probe tomography (APT). The Nb concentration at PAGB appeared to be 0.115 at.% for experimental steel containing 0.06 at.% Nb at the simulated welding thermal cycle for 10 s from 1320 to 950 °C. The critical time tc for achieving maximum segregation is calculated to be 565 s for the experimental steel. For the first time, the diffusion coefficient of Nb in desegregation process is calculated for the temperature of Ti = 950 °C using non-equilibrium segregation model and APT experimental result and is confirmed to be 9.23 × 10−11 m2/s. Based on it, the kinetics of Nb non-equilibrium segregation at the PAGBs in welding process is outlined, and the segregation process and desegregation process are discussed. The Nb segregation at PAGB is also predicted over the t8/5 range of 3–600 s. The critical t8/5, at which the highest Nb concentration of 0.144 at.% at PAGB is predicted to be achieved, is ~ 29 s.
Vorheriger Artikel Thermodynamic assessment of the Ni–Te system
Nächster Artikel Characterising and modelling the mechanical behaviour of polymeric foams under complex loading

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Metadaten
Titel
Study of Nb non-equilibrium segregation at prior austenite grain boundary in welding using atom probe tomography and modeling
Publikationsdatum
16.05.2019
Erschienen in
Journal of Materials Science / Ausgabe 16/2019
Print ISSN: 0022-2461
Elektronische ISSN: 1573-4803
DOI
https://doi.org/10.1007/s10853-019-03690-7

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