Atomic resolution imaging of precipitate transformation from cubic TaN to tetragonal CrTaN

Hilmar Kjartansson Danielsen; John Hald; Marcel A. J. Somers

doi:10.1016/j.scriptamat.2011.11.005

Atomic resolution imaging of precipitate transformation from cubic TaN to tetragonal CrTaN

Hilmar Kjartansson Danielsen, John Hald, Marcel A. J. Somers

Research output: Contribution to journal › Journal article › Research › peer-review

Abstract

In 9–12% Cr creep-resistant steels Cr(V,Nb,Ta)N Z-phase is known to replace metastable (V,Nb,Ta)N MN precipitates at high temperatures. The precipitation process of Z-phase does not follow the classical nucleation theory, where dissolving MN particles provide constituents for Z-phase nucleation in the matrix. Using atomic resolution transmission electron microscopy, the current work demonstrates that metastable cubic TaN precipitates in a complex steel gradually transform compositionally and crystallographically into stable tetragonal CrTaN precipitates under the influence of Cr indiffusion from the steel matrix.

Original language	English
Journal	Scripta Materialia
Volume	66
Issue number	5
Pages (from-to)	261-264
ISSN	1359-6462
DOIs	https://doi.org/10.1016/j.scriptamat.2011.11.005
Publication status	Published - 2012

Keywords

Heat-resistant steels
Nitrides
High-resolution electron microscopy (HREM)
Crystal structure
Phase transformations

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10.1016/j.scriptamat.2011.11.005

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title = "Atomic resolution imaging of precipitate transformation from cubic TaN to tetragonal CrTaN",

abstract = "In 9–12% Cr creep-resistant steels Cr(V,Nb,Ta)N Z-phase is known to replace metastable (V,Nb,Ta)N MN precipitates at high temperatures. The precipitation process of Z-phase does not follow the classical nucleation theory, where dissolving MN particles provide constituents for Z-phase nucleation in the matrix. Using atomic resolution transmission electron microscopy, the current work demonstrates that metastable cubic TaN precipitates in a complex steel gradually transform compositionally and crystallographically into stable tetragonal CrTaN precipitates under the influence of Cr indiffusion from the steel matrix.",

keywords = "Heat-resistant steels, Nitrides, High-resolution electron microscopy (HREM), Crystal structure, Phase transformations",

author = "Danielsen, {Hilmar Kjartansson} and John Hald and Somers, {Marcel A. J.}",

year = "2012",

doi = "10.1016/j.scriptamat.2011.11.005",

language = "English",

volume = "66",

pages = "261--264",

journal = "Scripta Materialia",

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T1 - Atomic resolution imaging of precipitate transformation from cubic TaN to tetragonal CrTaN

AU - Danielsen, Hilmar Kjartansson

AU - Hald, John

AU - Somers, Marcel A. J.

PY - 2012

Y1 - 2012

N2 - In 9–12% Cr creep-resistant steels Cr(V,Nb,Ta)N Z-phase is known to replace metastable (V,Nb,Ta)N MN precipitates at high temperatures. The precipitation process of Z-phase does not follow the classical nucleation theory, where dissolving MN particles provide constituents for Z-phase nucleation in the matrix. Using atomic resolution transmission electron microscopy, the current work demonstrates that metastable cubic TaN precipitates in a complex steel gradually transform compositionally and crystallographically into stable tetragonal CrTaN precipitates under the influence of Cr indiffusion from the steel matrix.

AB - In 9–12% Cr creep-resistant steels Cr(V,Nb,Ta)N Z-phase is known to replace metastable (V,Nb,Ta)N MN precipitates at high temperatures. The precipitation process of Z-phase does not follow the classical nucleation theory, where dissolving MN particles provide constituents for Z-phase nucleation in the matrix. Using atomic resolution transmission electron microscopy, the current work demonstrates that metastable cubic TaN precipitates in a complex steel gradually transform compositionally and crystallographically into stable tetragonal CrTaN precipitates under the influence of Cr indiffusion from the steel matrix.

KW - Heat-resistant steels

KW - Nitrides

KW - High-resolution electron microscopy (HREM)

KW - Crystal structure

KW - Phase transformations

U2 - 10.1016/j.scriptamat.2011.11.005

DO - 10.1016/j.scriptamat.2011.11.005

M3 - Journal article

VL - 66

SP - 261

EP - 264

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

IS - 5

ER -

Atomic resolution imaging of precipitate transformation from cubic TaN to tetragonal CrTaN

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Keywords

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