This title appears in the Scientific Report :
2021
Please use the identifier:
http://dx.doi.org/10.1016/j.actamat.2020.116542 in citations.
Please use the identifier: http://hdl.handle.net/2128/27914 in citations.
Precipitation behavior in G-phase strengthened ferritic stainless steels
Precipitation behavior in G-phase strengthened ferritic stainless steels
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 precipi...
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Personal Name(s): | Yang, Mujin (First author) |
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King, Daniel. J. M. / Povstugar, Ivan / Wen, Yuren / Luan, Junhua / Kuhn, Bernd / Jiao, Zengbao / Wang, Cuiping (Corresponding author) / Wenman, M. R. / Liu, Xingjun (Corresponding author) | |
Contributing Institute: |
Werkstoffstruktur und -eigenschaften; IEK-2 Analytik; ZEA-3 |
Published in: | Acta materialia, 205 (2021) S. 116542 - |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2021
|
DOI: |
10.1016/j.actamat.2020.116542 |
Document Type: |
Journal Article |
Research Program: |
ohne Topic |
Subject (ZB): | |
Link: |
Restricted Published on 2020-12-08. Available in OpenAccess from 2021-12-08. |
Publikationsportal JuSER |
Please use the identifier: http://hdl.handle.net/2128/27914 in citations.
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. |