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Remarkable Improvement of Creep Strength by Vanadium Addition in 2.25Cr Heat-Resistant Steel

Title
Remarkable Improvement of Creep Strength by Vanadium Addition in 2.25Cr Heat-Resistant Steel
Authors
Sung, Hyun JeKim, Sung-Joon
Date Issued
Nov-2018
Publisher
Nippon Tekko Kyokai/Iron and Steel Institute of Japan
Abstract
This paper reports the effect of vanadium (V) addition on elimination of easily coarsening M23C6 carbide and on remarkable creep strength improvement in T/P23 heat-resistant steel (2.25Cr-1.5W-VNbTi). Increase in V content eliminates coarse M23C6 and allows only precipitation of MX carbo-nitrides in T/P23 heat-resistant steel. Fine MX effectively stabilizes sub-boundaries of bainite microstructure, so coalescence of neighboring sub-boundaries and subsequent creep strength loss are suppressed. This steel even surpasses the creep life of conventional 9 wt.% Cr steels due to powerful sub-boundary hardening.
URI
http://oasis.postech.ac.kr/handle/2014.oak/94936
ISSN
0915-1559
Article Type
Article
Citation
ISIJ International, vol. 58, no. 11, page. 2142 - 2146, 2018-11
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김성준KIM, SUNG JOON
Ferrous & Energy materials Technology
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