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Title: ALLOY DESIGN AND DEVELOPMENT OF HIGH CR CONTAINING FECRAL FERRITIC ALLOYS FOR EXTREME ENVIRONMENTS

Abstract

A new alloy design concept for creep- and corrosion-resistant, fully ferritic alloys was proposed for high-temperature structural applications in current/future fossil-fired power plants. The alloys based on Fe-30Cr-3Al (in weight percent) with minor alloying additions of Nb, W, Si, Zr and/or Y were evaluated with a design strategy for corrosion resistance though high Cr content, steam oxidation resistance through alumina-scale formation, and high-temperature creep performance through fine particle dispersion of Fe2(Nb,W)-type Laves phase in the BCC-Fe matrix, which target to be used in harsh environments such as combustion and/or steam containing atmospheres, at or above 700°C. The alloys consisted of Fe-30Cr-3Al-1Nb-6W with minor alloying additions exhibited a successful combination of oxidation/corrosion/creep-resistant performances comparable or superior to those of commercially available heat resistant austenitic stainless steels. An optimized thermo-mechanical treatment combined with selected minor alloying addition resulted in a refined grain structure with high thermal stability even at 1200°C, which improved room-temperature ductility without sacrificing the creep performance. The mechanism of grain refinement in the alloy system has been discussed.

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [2];  [2];  [3]
  1. ORNL
  2. University of Tennessee, Knoxville (UTK)
  3. University of Tennessee (UT)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Fossil Energy (FE)
OSTI Identifier:
1607120
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Conference
Resource Relation:
Conference: Joint EPRI – 123HiMAT International Conference on Advances in High Temperature Materials - Nagasak, , Japan - 10/20/2019 8:00:00 AM-10/24/2019 8:00:00 AM
Country of Publication:
United States
Language:
English

Citation Formats

Yamamoto, Yukinori, Pint, Bruce A., Brady, Michael, Babu, Suresh S., Kuo, Chih-Hsiang, and Shassere, Benjamin. ALLOY DESIGN AND DEVELOPMENT OF HIGH CR CONTAINING FECRAL FERRITIC ALLOYS FOR EXTREME ENVIRONMENTS. United States: N. p., 2019. Web.
Yamamoto, Yukinori, Pint, Bruce A., Brady, Michael, Babu, Suresh S., Kuo, Chih-Hsiang, & Shassere, Benjamin. ALLOY DESIGN AND DEVELOPMENT OF HIGH CR CONTAINING FECRAL FERRITIC ALLOYS FOR EXTREME ENVIRONMENTS. United States.
Yamamoto, Yukinori, Pint, Bruce A., Brady, Michael, Babu, Suresh S., Kuo, Chih-Hsiang, and Shassere, Benjamin. 2019. "ALLOY DESIGN AND DEVELOPMENT OF HIGH CR CONTAINING FECRAL FERRITIC ALLOYS FOR EXTREME ENVIRONMENTS". United States. https://www.osti.gov/servlets/purl/1607120.
@article{osti_1607120,
title = {ALLOY DESIGN AND DEVELOPMENT OF HIGH CR CONTAINING FECRAL FERRITIC ALLOYS FOR EXTREME ENVIRONMENTS},
author = {Yamamoto, Yukinori and Pint, Bruce A. and Brady, Michael and Babu, Suresh S. and Kuo, Chih-Hsiang and Shassere, Benjamin},
abstractNote = {A new alloy design concept for creep- and corrosion-resistant, fully ferritic alloys was proposed for high-temperature structural applications in current/future fossil-fired power plants. The alloys based on Fe-30Cr-3Al (in weight percent) with minor alloying additions of Nb, W, Si, Zr and/or Y were evaluated with a design strategy for corrosion resistance though high Cr content, steam oxidation resistance through alumina-scale formation, and high-temperature creep performance through fine particle dispersion of Fe2(Nb,W)-type Laves phase in the BCC-Fe matrix, which target to be used in harsh environments such as combustion and/or steam containing atmospheres, at or above 700°C. The alloys consisted of Fe-30Cr-3Al-1Nb-6W with minor alloying additions exhibited a successful combination of oxidation/corrosion/creep-resistant performances comparable or superior to those of commercially available heat resistant austenitic stainless steels. An optimized thermo-mechanical treatment combined with selected minor alloying addition resulted in a refined grain structure with high thermal stability even at 1200°C, which improved room-temperature ductility without sacrificing the creep performance. The mechanism of grain refinement in the alloy system has been discussed.},
doi = {},
url = {https://www.osti.gov/biblio/1607120}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2019},
month = {10}
}

Conference:
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