Kinetics of Z-Phase Precipitation in 9 to 12 pct Cr Steels

Hilmar Kjartansson Danielsen; Paolo Emilio di Nunzio; John Hald

doi:10.1007/s11661-012-1583-9

Kinetics of Z-Phase Precipitation in 9 to 12 pct Cr Steels

Hilmar Kjartansson Danielsen
, Paolo Emilio di Nunzio
, John Hald

Centro Sviluppo Materiali S.p.A.
Ørsted A/S

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

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Abstract

The Z-phase nitride is seen as a detrimental phase in 9 to 12 pct Cr steels as it is in competition with the beneficial MX particles. Two model steels, with 9 pct Cr and 12 pct Cr content, respectively, were designed to study the effect of Cr on Z-phase precipitation kinetics. The steels were isothermally aged at 873 K, 923 K, and 973 K (600 °C, 650 °C, and 700 °C) for up to 30,000 hours in order for Z-phase to replace MX. X-ray diffraction (XRD) analysis of extracted precipitates was used to quantitatively follow the evolution of the nitrides population. It was found that the 12 pct Cr steel precipitated Z-phase 20 to 50 times faster than the 9 pct Cr steel. Transmission electron microscopy (TEM) was applied to follow the Z-phase precipitation, using energy-dispersive X-ray spectroscopy (EDS) line scans and atomic resolution imaging. © The Minerals, Metals & Materials Society and ASM International 2013

Original language	English
Journal	Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science
Volume	44
Issue number	5
Pages (from-to)	2445-2452
ISSN	1073-5623
DOIs	https://doi.org/10.1007/s11661-012-1583-9
Publication status	Published - 2013

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title = "Kinetics of Z-Phase Precipitation in 9 to 12 pct Cr Steels",

abstract = "The Z-phase nitride is seen as a detrimental phase in 9 to 12 pct Cr steels as it is in competition with the beneficial MX particles. Two model steels, with 9 pct Cr and 12 pct Cr content, respectively, were designed to study the effect of Cr on Z-phase precipitation kinetics. The steels were isothermally aged at 873 K, 923 K, and 973 K (600 °C, 650 °C, and 700 °C) for up to 30,000 hours in order for Z-phase to replace MX. X-ray diffraction (XRD) analysis of extracted precipitates was used to quantitatively follow the evolution of the nitrides population. It was found that the 12 pct Cr steel precipitated Z-phase 20 to 50 times faster than the 9 pct Cr steel. Transmission electron microscopy (TEM) was applied to follow the Z-phase precipitation, using energy-dispersive X-ray spectroscopy (EDS) line scans and atomic resolution imaging. {\textcopyright} The Minerals, Metals \& Materials Society and ASM International 2013",

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doi = "10.1007/s11661-012-1583-9",

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T1 - Kinetics of Z-Phase Precipitation in 9 to 12 pct Cr Steels

AU - Danielsen, Hilmar Kjartansson

AU - Nunzio, Paolo Emilio di

AU - Hald, John

PY - 2013

Y1 - 2013

N2 - The Z-phase nitride is seen as a detrimental phase in 9 to 12 pct Cr steels as it is in competition with the beneficial MX particles. Two model steels, with 9 pct Cr and 12 pct Cr content, respectively, were designed to study the effect of Cr on Z-phase precipitation kinetics. The steels were isothermally aged at 873 K, 923 K, and 973 K (600 °C, 650 °C, and 700 °C) for up to 30,000 hours in order for Z-phase to replace MX. X-ray diffraction (XRD) analysis of extracted precipitates was used to quantitatively follow the evolution of the nitrides population. It was found that the 12 pct Cr steel precipitated Z-phase 20 to 50 times faster than the 9 pct Cr steel. Transmission electron microscopy (TEM) was applied to follow the Z-phase precipitation, using energy-dispersive X-ray spectroscopy (EDS) line scans and atomic resolution imaging. © The Minerals, Metals & Materials Society and ASM International 2013

AB - The Z-phase nitride is seen as a detrimental phase in 9 to 12 pct Cr steels as it is in competition with the beneficial MX particles. Two model steels, with 9 pct Cr and 12 pct Cr content, respectively, were designed to study the effect of Cr on Z-phase precipitation kinetics. The steels were isothermally aged at 873 K, 923 K, and 973 K (600 °C, 650 °C, and 700 °C) for up to 30,000 hours in order for Z-phase to replace MX. X-ray diffraction (XRD) analysis of extracted precipitates was used to quantitatively follow the evolution of the nitrides population. It was found that the 12 pct Cr steel precipitated Z-phase 20 to 50 times faster than the 9 pct Cr steel. Transmission electron microscopy (TEM) was applied to follow the Z-phase precipitation, using energy-dispersive X-ray spectroscopy (EDS) line scans and atomic resolution imaging. © The Minerals, Metals & Materials Society and ASM International 2013

U2 - 10.1007/s11661-012-1583-9

DO - 10.1007/s11661-012-1583-9

M3 - Journal article

SN - 1073-5623

VL - 44

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EP - 2452

JO - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

JF - Metallurgical and Materials Transactions A: Physical Metallurgy and Materials Science

IS - 5

ER -

Kinetics of Z-Phase Precipitation in 9 to 12 pct Cr Steels

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