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

Kyu Ho Lee; Sung Min Hong; Jae Hyeok Shim; Jin Yoo Suh; Joo Youl Huh; Woo Sang Jung

doi:10.1016/j.matchar.2014.12.028

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

Kyu Ho Lee, Sung Min Hong, Jae Hyeok Shim, Jin Yoo Suh, Joo Youl Huh, Woo Sang Jung

Department of Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

23 Citations (Scopus)

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 Nb-containing steel was attributed to the gradual formation of Z-phase at the expense of M₂N precipitates during creep exposure.

Original language	English
Pages (from-to)	79-84
Number of pages	6
Journal	Materials Characterization
Volume	102
DOIs	https://doi.org/10.1016/j.matchar.2014.12.028
Publication status	Published - 2015 Apr 1

Keywords

Creep strength
Heat-resistant steels
Precipitation
XRD
Z-phase

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.matchar.2014.12.028

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

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 Nb-containing steel was attributed to the gradual formation of Z-phase at the expense of M2N precipitates during creep exposure.",

keywords = "Creep strength, Heat-resistant steels, Precipitation, XRD, Z-phase",

author = "Lee, {Kyu Ho} and Hong, {Sung Min} and Shim, {Jae Hyeok} and Suh, {Jin Yoo} and Huh, {Joo Youl} and Jung, {Woo Sang}",

note = "Funding Information: The authors gratefully acknowledge the financial support provided by the Korea Government Ministry of Knowledge Economy through the Korea Institute of Energy Technology Evaluation and Planning ( Grant No. 2012T100201597 ) and the Korea Institute of Science and Technology ( Grant No. 2E24692 ). The authors also thank Doosan Heavy Industries & Construction Co., Ltd. for providing the materials.",

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doi = "10.1016/j.matchar.2014.12.028",

language = "English",

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journal = "Materials Characterization",

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AU - Lee, Kyu Ho

AU - Hong, Sung Min

AU - Shim, Jae Hyeok

AU - Suh, Jin Yoo

AU - Huh, Joo Youl

AU - Jung, Woo Sang

N1 - Funding Information: The authors gratefully acknowledge the financial support provided by the Korea Government Ministry of Knowledge Economy through the Korea Institute of Energy Technology Evaluation and Planning ( Grant No. 2012T100201597 ) and the Korea Institute of Science and Technology ( Grant No. 2E24692 ). The authors also thank Doosan Heavy Industries & Construction Co., Ltd. for providing the materials.

PY - 2015/4/1

Y1 - 2015/4/1

N2 - 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 Nb-containing steel was attributed to the gradual formation of Z-phase at the expense of M2N precipitates during creep exposure.

AB - 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 Nb-containing steel was attributed to the gradual formation of Z-phase at the expense of M2N precipitates during creep exposure.

KW - Creep strength

KW - Heat-resistant steels

KW - Precipitation

KW - XRD

KW - Z-phase

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VL - 102

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JO - Materials Characterization

JF - Materials Characterization

ER -

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

Abstract

Keywords

ASJC Scopus subject areas

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