Effect of Nb addition on Z-phase formation and creep strength in high-Cr martensitic heat-resistant steels

Title
Effect of Nb addition on Z-phase formation and creep strength in high-Cr martensitic heat-resistant steels
Authors
이규호홍성민심재혁서진유허주열정우상
Keywords
Heat-resistant steels; Creep strength; Precipitation; Z-phase; XRD
Issue Date
2015-04
Publisher
Materials characterization
Citation
VOL 102, 79-84
Abstract
The effect of Nb addition on the creep strength of high-Cr martensitic heat-resistant steel was investigated at temperatures ranging from 839 to 894 K. The short-term creep properties were improved by Nb addition due to the enhanced MX precipitation. However, Nb addition deteriorated the steel's long-term stability resulting in an even shorter creep-rupture life than the original alloy. Onset of the accelerated degradation in Nbcontaining steel was attributed to the gradual formation of Z-phase at the expense of M2N precipitates during creep exposure.
URI
http://pubs.kist.re.kr/handle/201004/49920
ISSN
10445803
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KIST Publication > Article
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