Role of Cr Content in Microstructure, Creep, and Oxidation Resistance of Alumina-Forming Austenitic Alloys at 850–900◦C

Yukinori Yamamoto; Qing Qiang Ren; Michael P. Brady

doi:10.3390/met12050717

Role of Cr Content in Microstructure, Creep, and Oxidation Resistance of Alumina-Forming Austenitic Alloys at 850–900^◦C

Yukinori Yamamoto, Qing Qiang Ren, Michael P. Brady

Alloy Behavior & Design

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

Creep-rupture properties and oxidation behavior of a series of alumina-forming austenitic (AFA) alloys with variations of Cr contents, based on Fe-(13.5-18)Cr-25Ni-4Al-1.5Nb-0.1C in weight percent, have been evaluated at 850–900^◦C. The study investigates material responses in the properties and microstructure through compositional modifications in AFA alloys, targeting performance optimization of alloys under high-temperature, corrosive industrial environments. The creep-rupture life of the alloys at 850^◦C and 30MPa monotonically decreased with increasing Cr content, which was correlated with changes in secondary phase volume fractions, such as the reduction in B2-NiAl + Laves-Fe₂Nb and increase in Sigma-FeCr with Cr content. The oxidation test at 900^◦C in a water-vapor containing environment revealed a range of Cr content from 13.9 to 15.7 wt.%, enabling the formation of stable, protective external alumina scale as well as preventing internal oxidation/nitridation for up to total 7000 h exposure. On the other hand, the alloys with >16.7 wt.% Cr formed Sigma precipitates, which caused a reduction in not only Cr but also Al in the austenite matrix, resulting in less oxidation resistance than other alloys. The findings will guide the further optimization of material performance in the AFA alloy series.

Original language	English
Article number	717
Journal	Metals
Volume	12
Issue number	5
DOIs	https://doi.org/10.3390/met12050717
State	Published - May 2022

Funding

Acknowledgments: The authors would like to thank Xingbo Liu of West Virginia University for leading the entire project; Kevin Hanson, Greg Cox, Dustin Heidel, and Daniel Moore of ORNL for material preparation; George Garner, Michael Stephens, Tracie Lowe, and Victoria Cox of ORNL for experimental works; and Rishi Pillai and Jon Poplawsky of ORNL for their thoughtful review and guidance for the manuscript preparation. Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan (accessed on 22 April 2022)). This work was performed in support of the US DOE Office of Fossil Energy and Carbon Management (FECM) through the Solid Oxide Fuel Cell Core Technology and Innovative Concepts program (DE-FE0027947). SEM characterization was performed at ORNL?s CNMS, which is a US DOE office of science user facility. A part of the study was also supported by US-DOE, Office of FECM, the Advanced Research Materials Program and the Crosscutting Technology High Performance Materials Research Program.The authors would like to thank Xingbo Liu of West Virginia University for leading the entire project; Kevin Hanson, Greg Cox, Dustin Heidel, and Daniel Moore of ORNL for material preparation; George Garner, Michael Stephens, Tracie Lowe, and Victoria Cox of ORNL for experimental works; and Rishi Pillai and Jon Poplawsky of ORNL for their thoughtful review and guidance for the manuscript preparation. Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan (accessed on 22 April 2022)). Funding: This work was performed in support of the US DOE Office of Fossil Energy and Carbon Management (FECM) through the Solid Oxide Fuel Cell Core Technology and Innovative Concepts program (DE-FE0027947). SEM characterization was performed at ORNL’s CNMS, which is a US DOE office of science user facility. A part of the study was also supported by US-DOE, Office of FECM, the Advanced Research Materials Program and the Crosscutting Technology High Performance Materials Research Program.

Funders	Funder number
Crosscutting Technology High Performance Materials Research Program
DOE Public Access Plan
Daniel Moore of ORNL
FECM	DE-FE0027947
Office of FECM
US DOE Office of Fossil Energy and Carbon Management
US-DOE
U.S. Department of Energy
Oak Ridge National Laboratory	DE-AC05-00OR22725
West Virginia University

Keywords

AFA alloys
B2-NiAL
Laves-FeNb
Sigma-FeCr
creep
oxidation

Access to Document

10.3390/met12050717

Cite this

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title = "Role of Cr Content in Microstructure, Creep, and Oxidation Resistance of Alumina-Forming Austenitic Alloys at 850–900◦C",

abstract = "Creep-rupture properties and oxidation behavior of a series of alumina-forming austenitic (AFA) alloys with variations of Cr contents, based on Fe-(13.5-18)Cr-25Ni-4Al-1.5Nb-0.1C in weight percent, have been evaluated at 850–900◦C. The study investigates material responses in the properties and microstructure through compositional modifications in AFA alloys, targeting performance optimization of alloys under high-temperature, corrosive industrial environments. The creep-rupture life of the alloys at 850◦C and 30MPa monotonically decreased with increasing Cr content, which was correlated with changes in secondary phase volume fractions, such as the reduction in B2-NiAl + Laves-Fe2Nb and increase in Sigma-FeCr with Cr content. The oxidation test at 900◦C in a water-vapor containing environment revealed a range of Cr content from 13.9 to 15.7 wt.%, enabling the formation of stable, protective external alumina scale as well as preventing internal oxidation/nitridation for up to total 7000 h exposure. On the other hand, the alloys with >16.7 wt.% Cr formed Sigma precipitates, which caused a reduction in not only Cr but also Al in the austenite matrix, resulting in less oxidation resistance than other alloys. The findings will guide the further optimization of material performance in the AFA alloy series.",

keywords = "AFA alloys, B2-NiAL, Laves-FeNb, Sigma-FeCr, creep, oxidation",

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