Microstructure and long-term creep properties of 9–12% Cr steels

John Hald

doi:10.1016/j.ijpvp.2007.06.010

Microstructure and long-term creep properties of 9–12% Cr steels

John Hald

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Abstract

Advanced microstructure characterisation and microstructure modelling has demonstrated that long-term microstructure stability in 9–12% Cr steels under technical loading conditions is equivalent to precipitate stability. Mo and W can have a positive influence on long-term creep strength of 9–12% Cr steels by Laves phase precipitation hardening. Unexpected breakdown of long-term creep stability of a number of alloys is caused by precipitation of the complex Z-phase nitride, which may completely dissolve fine V and Nb containing MX nitrides. High Cr contents of 10% and above in the steels accelerate Z-phase precipitation.

Original language	English
Journal	International Journal of Pressure Vessels and Piping
Volume	85
Issue number	1-2
Pages (from-to)	30-37
ISSN	0308-0161
DOIs	https://doi.org/10.1016/j.ijpvp.2007.06.010
Publication status	Published - 2008

Keywords

Z-phase
Precipitate stability modelling
Laves phase
Long-term creep stability
MX nitrides
Creep mechanisms
Precipitate characterisation
9–12% Cr steels

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title = "Microstructure and long-term creep properties of 9–12\% Cr steels",

abstract = "Advanced microstructure characterisation and microstructure modelling has demonstrated that long-term microstructure stability in 9–12\% Cr steels under technical loading conditions is equivalent to precipitate stability. Mo and W can have a positive influence on long-term creep strength of 9–12\% Cr steels by Laves phase precipitation hardening. Unexpected breakdown of long-term creep stability of a number of alloys is caused by precipitation of the complex Z-phase nitride, which may completely dissolve fine V and Nb containing MX nitrides. High Cr contents of 10\% and above in the steels accelerate Z-phase precipitation.",

keywords = "Z-phase, Precipitate stability modelling, Laves phase, Long-term creep stability, MX nitrides, Creep mechanisms, Precipitate characterisation, 9–12\% Cr steels",

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language = "English",

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journal = "International Journal of Pressure Vessels and Piping",

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T1 - Microstructure and long-term creep properties of 9–12% Cr steels

AU - Hald, John

PY - 2008

Y1 - 2008

N2 - Advanced microstructure characterisation and microstructure modelling has demonstrated that long-term microstructure stability in 9–12% Cr steels under technical loading conditions is equivalent to precipitate stability. Mo and W can have a positive influence on long-term creep strength of 9–12% Cr steels by Laves phase precipitation hardening. Unexpected breakdown of long-term creep stability of a number of alloys is caused by precipitation of the complex Z-phase nitride, which may completely dissolve fine V and Nb containing MX nitrides. High Cr contents of 10% and above in the steels accelerate Z-phase precipitation.

AB - Advanced microstructure characterisation and microstructure modelling has demonstrated that long-term microstructure stability in 9–12% Cr steels under technical loading conditions is equivalent to precipitate stability. Mo and W can have a positive influence on long-term creep strength of 9–12% Cr steels by Laves phase precipitation hardening. Unexpected breakdown of long-term creep stability of a number of alloys is caused by precipitation of the complex Z-phase nitride, which may completely dissolve fine V and Nb containing MX nitrides. High Cr contents of 10% and above in the steels accelerate Z-phase precipitation.

KW - Z-phase

KW - Precipitate stability modelling

KW - Laves phase

KW - Long-term creep stability

KW - MX nitrides

KW - Creep mechanisms

KW - Precipitate characterisation

KW - 9–12% Cr steels

U2 - 10.1016/j.ijpvp.2007.06.010

DO - 10.1016/j.ijpvp.2007.06.010

M3 - Journal article

SN - 0308-0161

VL - 85

SP - 30

EP - 37

JO - International Journal of Pressure Vessels and Piping

JF - International Journal of Pressure Vessels and Piping

IS - 1-2

ER -

Microstructure and long-term creep properties of 9–12% Cr steels

Abstract

Keywords

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