Microstructural evolution and creep-rupture life estimation of high-Cr martensitic heat-resistant steels

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

doi:10.1016/j.matchar.2015.06.005

Microstructural evolution and creep-rupture life estimation of high-Cr martensitic heat-resistant steels

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

Department of Materials Science and Engineering

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

29 Citations (Scopus)

Abstract

The creep behavior of high-Cr martensitic heat-resistant steels was investigated to discuss the dominant factors determining the creep-rupture life in the temperature range from 839 to 894 K. Variation in the content of Nb, a carbide former, induced a difference in creep-degradation at the long-term creep condition, which was attributed to the formation of a Z-phase at the expense of M₂N precipitates. Due to the continuous evolution of the microstructure during creep service, a simple form of the Monkman-Grant equation could not properly describe the creep-rupture life of the alloys; however, the modified Monkman-Grant equation, which incorporates the creep rate at the tertiary creep region, resulted in a reasonable estimation of creep-rupture life.

Original language	English
Pages (from-to)	266-272
Number of pages	7
Journal	Materials Characterization
Volume	106
DOIs	https://doi.org/10.1016/j.matchar.2015.06.005
Publication status	Published - 2015 Jun 22

Keywords

Creep-rupture life
Heat-resistant steels
Monkman-Grant equation
Precipitation
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.2015.06.005

Cite this

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title = "Microstructural evolution and creep-rupture life estimation of high-Cr martensitic heat-resistant steels",

abstract = "The creep behavior of high-Cr martensitic heat-resistant steels was investigated to discuss the dominant factors determining the creep-rupture life in the temperature range from 839 to 894 K. Variation in the content of Nb, a carbide former, induced a difference in creep-degradation at the long-term creep condition, which was attributed to the formation of a Z-phase at the expense of M2N precipitates. Due to the continuous evolution of the microstructure during creep service, a simple form of the Monkman-Grant equation could not properly describe the creep-rupture life of the alloys; however, the modified Monkman-Grant equation, which incorporates the creep rate at the tertiary creep region, resulted in a reasonable estimation of creep-rupture life.",

keywords = "Creep-rupture life, Heat-resistant steels, Monkman-Grant equation, Precipitation, Z-phase",

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

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AU - Lee, Kyu Ho

AU - Suh, Jin Yoo

AU - Hong, Sung Min

AU - Huh, Joo Youl

AU - Jung, Woo Sang

PY - 2015/6/22

Y1 - 2015/6/22

N2 - The creep behavior of high-Cr martensitic heat-resistant steels was investigated to discuss the dominant factors determining the creep-rupture life in the temperature range from 839 to 894 K. Variation in the content of Nb, a carbide former, induced a difference in creep-degradation at the long-term creep condition, which was attributed to the formation of a Z-phase at the expense of M2N precipitates. Due to the continuous evolution of the microstructure during creep service, a simple form of the Monkman-Grant equation could not properly describe the creep-rupture life of the alloys; however, the modified Monkman-Grant equation, which incorporates the creep rate at the tertiary creep region, resulted in a reasonable estimation of creep-rupture life.

AB - The creep behavior of high-Cr martensitic heat-resistant steels was investigated to discuss the dominant factors determining the creep-rupture life in the temperature range from 839 to 894 K. Variation in the content of Nb, a carbide former, induced a difference in creep-degradation at the long-term creep condition, which was attributed to the formation of a Z-phase at the expense of M2N precipitates. Due to the continuous evolution of the microstructure during creep service, a simple form of the Monkman-Grant equation could not properly describe the creep-rupture life of the alloys; however, the modified Monkman-Grant equation, which incorporates the creep rate at the tertiary creep region, resulted in a reasonable estimation of creep-rupture life.

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Microstructural evolution and creep-rupture life estimation of high-Cr martensitic heat-resistant steels

Abstract

Keywords

ASJC Scopus subject areas

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