NDLI: Creep and Oxidation Behavior of Modified CF8C-Plus with W, Cu, Ni, and Cr

Content Provider	Springer Nature Link
Author	Ucic, Kinga A. Dryepondt, Sebastien Yamamoto, Yukiri Maziasz, Philip J.
Copyright Year	2016
Abstract	The microstructures of modified CF8C-Plus (Fe-19Cr-12Ni-0.4W-3.8Mn-0.2Mo-0.6Nb-0.5Si-0.9C) with W and Cu (CF8CPWCu) and CF8CPWCu enhanced with 21Cr + 15Ni or 22Cr + 17.5Ni were characterized in the as-cast condition and after creep testing. When imaged at lower magnifications, the as-cast microstructure was similar among all three alloys as they all contained a Nb-rich interdendritic phase and Mn-based inclusions. Transmission electron microscopy (TEM) analysis showed the presence of nanoscale Cu-rich nanoprecipitates distributed uniformly throughout the matrix of CF8CPWCu, whereas in CF8CPWCu22/17, Cu precipitates were found primarily at the grain boundaries. The presence of these nanoscale Cu-rich particles, in addition to W-rich Cr$_{23}$C$_{6}$, nanoscale Nb carbides, and Z-phase (Nb$_{2}$Cr$_{2}$N$_{2}$), improved the creep strength of the CF8CPWCu steel. Modification of CF8CPWCu with Cr and Ni contents slightly decreased the creep strength but significantly improved the oxidation behavior at 1073 K (800 °C). In particular, the addition of 22Cr and 17.5Ni strongly enhanced the oxidation resistance of the stainless steel resulting in a 100 degrees or greater temperature improvement, and this composition provided the best balance between improving both mechanical properties and oxidation resistance.
Starting Page	1641
Ending Page	1653
Page Count	13
File Format	PDF
ISSN	10735623
Journal	Metallurgical and Materials Transactions A
Volume Number	47
Issue Number	4
e-ISSN	15431940
Language	English
Publisher	Springer US
Publisher Date	2016-02-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Metallic Materials Characterization and Evaluation of Materials Structural Materials Surfaces and Interfaces, Thin Films Nanotechnology
Content Type	Text
Resource Type	Article
Subject	Mechanics of Materials Metals and Alloys Condensed Matter Physics

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