Journal Article

FZJ-2021-02139

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Precipitation behavior in G-phase strengthened ferritic stainless steels

Yang, M. (First author) ; King, D. J. M. ; Povstugar, I.FZJ* ; Wen, Y. ; Luan, J. ; Kuhn, B.FZJ* ; Jiao, Z. ; Wang, C. (Corresponding author) ; Wenman, M. R. ; Liu, X. (Corresponding author)

2021
Elsevier Science Amsterdam [u.a.]

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Please use a persistent id in citations: http://hdl.handle.net/2128/27914  doi:10.1016/j.actamat.2020.116542

Abstract: A series of G-phase strengthened ferritic stainless steels Fe-20Cr-3Ni-3Si-X (X = 2Mn, 1Mn-2Ti, 1Mn-2Nb and 1Mn-2Ta) are characterized after aging using experimental (microhardness, TEM and APT) and theoretical (DFT) techniques. The results indicate that the Ni16Mn6Si7 G-phase shows sluggish precipitation during aging treatment. This was attributed to the small difference in the enthalpy of formation between the Ni16Mn6Si7 G- and BCC phase and the requirement of high Ni:Fe ratio. A superfine Ni16Ti6Si7 G-phase was found to precipitate as a core accompanied with an “envelope” of Fe2TiSi-L21 Heusler phase during early aging (≤24 h) in the Ti containing alloy. This morphology is predicted to occur due to early Ni clustering in ferrite and a negative Ni concentration gradient away from the cluster that favors Fe2TiSi formation. The G-phases show only particle coarsening without obvious chemical composition evolution for further aging up to 96 h. A prominent hardness increase of 100-275 HV was also observed during aging. These findings provide valuable insight into methods for precipitating low lattice mismatch silicide phases for the development of future high strength steels.

Keyword(s): Materials Science (2nd)

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Contributing Institute(s):

1. Analytik (ZEA-3)
2. Werkstoffstruktur und -eigenschaften (IEK-2)

Research Program(s):

1. 899 - ohne Topic (POF4-899) (POF4-899)

Appears in the scientific report 2021

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; Essential Science Indicators ; IF >= 5 ; JCR ; SCOPUS ; Science Citation Index Expanded ; Web of Science Core Collection

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