Kinetics of the α-α′ phase separation in a 14%Cr oxide dispersion steel at intermediate temperatures

Yael Templeman; Malki Pinkas; Eli Brosh; Einat Strumza; Shmuel Hayun; Louisa Meshi

doi:10.1016/j.matlet.2020.129088

Kinetics of the α-α′ phase separation in a 14%Cr oxide dispersion steel at intermediate temperatures

Yael Templeman, Malki Pinkas, Eli Brosh, Einat Strumza, Shmuel Hayun, Louisa Meshi

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

Abstract

Current paper presents a study of the α–α′ phase separation during prolonged heat treatments at 400 and 450 °C of 14%Cr oxide dispersion strengthened steel. Vickers hardness, thermo-electric power and differential scanning calorimetry measurements enabled to conclude that α′ precipitates already after 5,000 hr at 400 °C, while at 450 °C precipitation is detected only after 10,000 hr. Yet, the amount of α′ after 10,000 hr at 450 °C was larger. The results, combined with thermodynamic and diffusion length calculations, affirm that in 14%Cr ODS steel the separation occurs by the nucleation and growth mechanism rather than spinodal decomposition.

Original language	English
Article number	129088
Journal	Materials Letters
Volume	285
DOIs	https://doi.org/10.1016/j.matlet.2020.129088
State	Published - 15 Feb 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2020 Elsevier B.V.

Funding

We thank CEA for providing the ODS alloy. Prof. Gelbstein and Mr. George are acknowledged for their help with TEP.

Funders	Funder number
California Earthquake Authority

Keywords

Embrittlement
Nucleation and growth
ODS steels
α-α′ phase separation

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10.1016/j.matlet.2020.129088

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abstract = "Current paper presents a study of the α–α′ phase separation during prolonged heat treatments at 400 and 450 °C of 14\%Cr oxide dispersion strengthened steel. Vickers hardness, thermo-electric power and differential scanning calorimetry measurements enabled to conclude that α′ precipitates already after 5,000 hr at 400 °C, while at 450 °C precipitation is detected only after 10,000 hr. Yet, the amount of α′ after 10,000 hr at 450 °C was larger. The results, combined with thermodynamic and diffusion length calculations, affirm that in 14\%Cr ODS steel the separation occurs by the nucleation and growth mechanism rather than spinodal decomposition.",

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AU - Templeman, Yael

AU - Pinkas, Malki

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AU - Strumza, Einat

AU - Hayun, Shmuel

AU - Meshi, Louisa

PY - 2021/2/15

Y1 - 2021/2/15

N2 - Current paper presents a study of the α–α′ phase separation during prolonged heat treatments at 400 and 450 °C of 14%Cr oxide dispersion strengthened steel. Vickers hardness, thermo-electric power and differential scanning calorimetry measurements enabled to conclude that α′ precipitates already after 5,000 hr at 400 °C, while at 450 °C precipitation is detected only after 10,000 hr. Yet, the amount of α′ after 10,000 hr at 450 °C was larger. The results, combined with thermodynamic and diffusion length calculations, affirm that in 14%Cr ODS steel the separation occurs by the nucleation and growth mechanism rather than spinodal decomposition.

AB - Current paper presents a study of the α–α′ phase separation during prolonged heat treatments at 400 and 450 °C of 14%Cr oxide dispersion strengthened steel. Vickers hardness, thermo-electric power and differential scanning calorimetry measurements enabled to conclude that α′ precipitates already after 5,000 hr at 400 °C, while at 450 °C precipitation is detected only after 10,000 hr. Yet, the amount of α′ after 10,000 hr at 450 °C was larger. The results, combined with thermodynamic and diffusion length calculations, affirm that in 14%Cr ODS steel the separation occurs by the nucleation and growth mechanism rather than spinodal decomposition.

KW - Embrittlement

KW - Nucleation and growth

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KW - α-α′ phase separation

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Kinetics of the α-α′ phase separation in a 14%Cr oxide dispersion steel at intermediate temperatures

Abstract

Bibliographical note

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Keywords

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