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

Department of Materials Engineering

Ben-Gurion University of the Negev

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

Keywords

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

All Science Journal Classification (ASJC) codes

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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

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.",

keywords = "Embrittlement, Nucleation and growth, ODS steels, α-α′ phase separation",

author = "Yael Templeman and Malki Pinkas and Eli Brosh and Einat Strumza and Shmuel Hayun and Louisa Meshi",

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T1 - Kinetics of the α-α′ phase separation in a 14%Cr oxide dispersion steel at intermediate temperatures

AU - Templeman, Yael

AU - Pinkas, Malki

AU - Brosh, Eli

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

KW - ODS steels

KW - α-α′ phase separation

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JO - Materials Letters

JF - Materials Letters

M1 - 129088

ER -

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

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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