TY - GEN
T1 - ALLOY DESIGN AND DEVELOPMENT OF HIGH CR CONTAINING FECRAL FERRITIC ALLOYS FOR EXTREME ENVIRONMENTS
AU - Yamamoto, Yukinori
AU - Pint, Bruce A.
AU - Brady, Michael P.
AU - Babu, Sudarsanam
AU - Kuo, Chih Hsiang
AU - Shassere, Benjamin
N1 - Publisher Copyright:
© 2019 ASM International® All rights reserved.
PY - 2019
Y1 - 2019
N2 - 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 the Fe-30Cr-3Al (in weight percent) system with minor alloying additions of Nb, W, Si, Zr and/or Y, were designed 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. Theses alloys are targeted for use in harsh environments such as combustion and/or steam containing atmospheres at 700°C or greater. The alloys, consisting of Fe-30Cr-3Al-1Nb-6W with minor alloying additions, exhibited a successful combination of oxidation, corrosion, and creep resistances comparable or superior to those of commercially available heat resistant austenitic stainless steels. An optimized thermo-mechanical treatment combined with selected minor alloying additions 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 is discussed.
AB - 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 the Fe-30Cr-3Al (in weight percent) system with minor alloying additions of Nb, W, Si, Zr and/or Y, were designed 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. Theses alloys are targeted for use in harsh environments such as combustion and/or steam containing atmospheres at 700°C or greater. The alloys, consisting of Fe-30Cr-3Al-1Nb-6W with minor alloying additions, exhibited a successful combination of oxidation, corrosion, and creep resistances comparable or superior to those of commercially available heat resistant austenitic stainless steels. An optimized thermo-mechanical treatment combined with selected minor alloying additions 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 is discussed.
UR - http://www.scopus.com/inward/record.url?scp=85097948886&partnerID=8YFLogxK
U2 - 10.31339/asm.cp.am-epri-2019p0628
DO - 10.31339/asm.cp.am-epri-2019p0628
M3 - Conference contribution
AN - SCOPUS:85097948886
T3 - Joint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials
SP - 628
EP - 639
BT - Joint EPRI-123HiMAT International Conference on Advances in High-Temperature Materials - Proceedings from EPRI's 9th International Conference on Advances in Materials Technology for Fossil Power Plants and the 2nd International 123HiMAT Conference on High-Temperature Materials
A2 - Shingledecker, John
A2 - Takeyama, Masao
PB - ASM International
T2 - Joint 9th International Conference on Advances in Materials Technology for Fossil Power Plants, EPRI 2019 and the 2nd International 123HiMAT Conference on High-Temperature Materials
Y2 - 21 October 2019 through 24 October 2019
ER -