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Erschienen in: Metallurgical and Materials Transactions A 2/2019

29.11.2018

Precipitation of η-Ni3(Ti, Al) Phase at Grain Boundaries in an Austenitic Precipitation-Strengthened Stainless Steel

verfasst von: Hui Li, Hui Song, Wenqing Liu

Erschienen in: Metallurgical and Materials Transactions A | Ausgabe 2/2019

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Abstract

The precipitation of the η-Ni3(Ti, Al) phase at grain boundaries in austenitic stainless steels significantly affects grain-boundary-related properties of the bulk material. In this study, the precipitation behavior of the η-Ni3(Ti, Al) phase in a thermally aged austenitic precipitation-strengthened stainless steel was evaluated during aging at 750 °C for 0.5 to 64 hours using scanning electron microscopy, transmission electron microscopy, and atom probe tomography. A higher number of plate-like η-Ni3(Ti, Al) phase particles precipitated at the grain boundaries with increasing aging time, and grew into the grain interior until the entire grain was occupied by this phase. The η phase had a {0001}η//{111}γ, \( \langle 11\bar{2}0\rangle_{{{\upeta }}} \)//〈110〉γ semi-coherent orientation relationship with the matrix, and contained many stacking faults. Ni- and Ti-rich layers alternated periodically between adjacent stacking faults in the η phase. Al segregated at stacking faults and the interface between the η phase and matrix. The partition coefficients of Ni, Al, and Si between the η precipitates and matrix decreased with increased aging time; however, the partition coefficient of Ti did not change significantly. The partition coefficients of the other elements increased with increasing aging time. The Ti:Al ratio of the η phase significantly increased with increasing aging time. Based on the experimental results, the precipitation and growth behaviors of η-Ni3(Ti, Al) phase precipitated at grain boundaries were discussed, which are expected to contribute to the design of austenitic stainless steel compositions with improved mechanical properties.

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Metadaten
Titel
Precipitation of η-Ni3(Ti, Al) Phase at Grain Boundaries in an Austenitic Precipitation-Strengthened Stainless Steel
verfasst von
Hui Li
Hui Song
Wenqing Liu
Publikationsdatum
29.11.2018
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions A / Ausgabe 2/2019
Print ISSN: 1073-5623
Elektronische ISSN: 1543-1940
DOI
https://doi.org/10.1007/s11661-018-5045-x

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