Review of Z phase precipitation in 9–12 wt-%Cr steels

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Abstract

For high temperature applications, 9–12 wt-%Cr steels in fossil fired power plants rely upon precipitate strengthening from (V,Nb)N MX nitrides for long term creep strength. During prolonged exposure at service temperature, another nitride precipitates: Cr(V,Nb)NZ phase. The Z phases lowly replaceMX, eventually causing a breakdown in creep strength. The present paper reviews the Z phase and its behaviour in 9–12 wt-%Cr steels including thermodynamic modelling, crystal structure, nucleation process and precipitation rate as a function of chemical composition. The influence of Z phase precipitation upon long term creep strength is assessed from several different 9–12wt-%Cr steel grades and alloy design philosophies.
Original languageEnglish
JournalMaterials Science and Technology
Volume32
Issue number2
Pages (from-to)126-137
ISSN0267-0836
DOIs
Publication statusPublished - 2016

Keywords

  • Z phase
  • MIX
  • 9–12Cr steels

Cite this

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title = "Review of Z phase precipitation in 9–12 wt-{\%}Cr steels",
abstract = "For high temperature applications, 9–12 wt-{\%}Cr steels in fossil fired power plants rely upon precipitate strengthening from (V,Nb)N MX nitrides for long term creep strength. During prolonged exposure at service temperature, another nitride precipitates: Cr(V,Nb)NZ phase. The Z phases lowly replaceMX, eventually causing a breakdown in creep strength. The present paper reviews the Z phase and its behaviour in 9–12 wt-{\%}Cr steels including thermodynamic modelling, crystal structure, nucleation process and precipitation rate as a function of chemical composition. The influence of Z phase precipitation upon long term creep strength is assessed from several different 9–12wt-{\%}Cr steel grades and alloy design philosophies.",
keywords = "Z phase, MIX, 9–12Cr steels",
author = "Danielsen, {Hilmar Kjartansson}",
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language = "English",
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pages = "126--137",
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publisher = "CRC Press/Balkema",
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Review of Z phase precipitation in 9–12 wt-%Cr steels. / Danielsen, Hilmar Kjartansson.

In: Materials Science and Technology, Vol. 32, No. 2, 2016, p. 126-137.

Research output: Contribution to journalJournal articleResearchpeer-review

TY - JOUR

T1 - Review of Z phase precipitation in 9–12 wt-%Cr steels

AU - Danielsen, Hilmar Kjartansson

PY - 2016

Y1 - 2016

N2 - For high temperature applications, 9–12 wt-%Cr steels in fossil fired power plants rely upon precipitate strengthening from (V,Nb)N MX nitrides for long term creep strength. During prolonged exposure at service temperature, another nitride precipitates: Cr(V,Nb)NZ phase. The Z phases lowly replaceMX, eventually causing a breakdown in creep strength. The present paper reviews the Z phase and its behaviour in 9–12 wt-%Cr steels including thermodynamic modelling, crystal structure, nucleation process and precipitation rate as a function of chemical composition. The influence of Z phase precipitation upon long term creep strength is assessed from several different 9–12wt-%Cr steel grades and alloy design philosophies.

AB - For high temperature applications, 9–12 wt-%Cr steels in fossil fired power plants rely upon precipitate strengthening from (V,Nb)N MX nitrides for long term creep strength. During prolonged exposure at service temperature, another nitride precipitates: Cr(V,Nb)NZ phase. The Z phases lowly replaceMX, eventually causing a breakdown in creep strength. The present paper reviews the Z phase and its behaviour in 9–12 wt-%Cr steels including thermodynamic modelling, crystal structure, nucleation process and precipitation rate as a function of chemical composition. The influence of Z phase precipitation upon long term creep strength is assessed from several different 9–12wt-%Cr steel grades and alloy design philosophies.

KW - Z phase

KW - MIX

KW - 9–12Cr steels

U2 - 10.1179/1743284715Y.0000000066

DO - 10.1179/1743284715Y.0000000066

M3 - Journal article

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SP - 126

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JO - Materials Science and Technology

JF - Materials Science and Technology

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