ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Mechanical Properties
Remarkable Improvement of Creep Strength by Vanadium Addition in 2.25Cr Heat-Resistant Steel
Hyun Je SungSung–Joon Kim
Author information
JOURNALS OPEN ACCESS FULL-TEXT HTML

2018 Volume 58 Issue 11 Pages 2142-2146

Details
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.

Information related to the author
© 2018 by The Iron and Steel Institute of Japan
Previous article Next article
feedback
Top