Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy

Yulia O. Kuzminova; Egor A. Kudryavtsev; Jae Kyung Han; Megumi Kawasaki; Stanislav A. Evlashin

doi:10.1016/j.jallcom.2021.161495

Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy

Yulia O. Kuzminova, Egor A. Kudryavtsev, Jae Kyung Han, Megumi Kawasaki, Stanislav A. Evlashin

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

20 Scopus citations

Abstract

Additive manufacturing (AM) of high-entropy alloys (HEAs) is a new challenge in the Material Science and Advanced Manufacturing fields. In the AM processing procedure, heat treatments after fabrication are often beneficial to stabilize microstructure and properties, while limited reports are available for AM HEAs. In the current study, the effect of a post-printing heat treatment at 400–1000 ℃ for 24 h and for 21 days on the changes in structures and phase compositions of an AM CrFeCoNi alloy prepared by the laser powder bed fusion AM technique is presented to better understand a heat treatment-microstructure-property relationship of the AM HEA. Heating up to 600 ℃ demonstrated the polygonization process in the alloy. Grain growth was observed in the alloy upon heating over 700 ℃, while a preferred texture is observed along the build direction after annealing at 900 ℃ for 24 h. The formation of the secondary phase was revealed, and it is associated with the impurities of the initial CrFeCoNi powder. The AM CrFeCoNi system demonstrates excellent phase stability inthe solid solution for all annealing temperatures.

Original language	English
Article number	161495
Journal	Journal of Alloys and Compounds
Volume	889
DOIs	https://doi.org/10.1016/j.jallcom.2021.161495
State	Published - Jan 5 2022
Externally published	Yes

Funding

This study was supported in part by the National Science Foundation of the United States under Grant No. DMR-1810343 (J.K.H. and M.K.). Additionally, the work was carried out in part using the equipment of the Joint Research Center of Belgorod State National Research University «Technology and Materials» with financial support from the Ministry of Education and Higher Education of the Russian Federation within the framework of agreement No. 075-15-2021-690 (E.A.K.). Access to the Scanning Electron Microscopy facilities was granted by Advanced Imaging Core Facility of Skoltech.

Funders	Funder number
Ministry of Education and Higher Education of the Russian Federation	075-15-2021-690
National Science Foundation	DMR-1810343

Keywords

A: high-entropy alloy
B: additive manufacturing, heat treatment
C: structural evolution, phase composition

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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10.1016/j.jallcom.2021.161495

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title = "Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy",

abstract = "Additive manufacturing (AM) of high-entropy alloys (HEAs) is a new challenge in the Material Science and Advanced Manufacturing fields. In the AM processing procedure, heat treatments after fabrication are often beneficial to stabilize microstructure and properties, while limited reports are available for AM HEAs. In the current study, the effect of a post-printing heat treatment at 400–1000 ℃ for 24 h and for 21 days on the changes in structures and phase compositions of an AM CrFeCoNi alloy prepared by the laser powder bed fusion AM technique is presented to better understand a heat treatment-microstructure-property relationship of the AM HEA. Heating up to 600 ℃ demonstrated the polygonization process in the alloy. Grain growth was observed in the alloy upon heating over 700 ℃, while a preferred texture is observed along the build direction after annealing at 900 ℃ for 24 h. The formation of the secondary phase was revealed, and it is associated with the impurities of the initial CrFeCoNi powder. The AM CrFeCoNi system demonstrates excellent phase stability inthe solid solution for all annealing temperatures.",

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author = "Kuzminova, {Yulia O.} and Kudryavtsev, {Egor A.} and Han, {Jae Kyung} and Megumi Kawasaki and Evlashin, {Stanislav A.}",

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AU - Kuzminova, Yulia O.

AU - Kudryavtsev, Egor A.

AU - Han, Jae Kyung

AU - Kawasaki, Megumi

AU - Evlashin, Stanislav A.

PY - 2022/1/5

Y1 - 2022/1/5

N2 - Additive manufacturing (AM) of high-entropy alloys (HEAs) is a new challenge in the Material Science and Advanced Manufacturing fields. In the AM processing procedure, heat treatments after fabrication are often beneficial to stabilize microstructure and properties, while limited reports are available for AM HEAs. In the current study, the effect of a post-printing heat treatment at 400–1000 ℃ for 24 h and for 21 days on the changes in structures and phase compositions of an AM CrFeCoNi alloy prepared by the laser powder bed fusion AM technique is presented to better understand a heat treatment-microstructure-property relationship of the AM HEA. Heating up to 600 ℃ demonstrated the polygonization process in the alloy. Grain growth was observed in the alloy upon heating over 700 ℃, while a preferred texture is observed along the build direction after annealing at 900 ℃ for 24 h. The formation of the secondary phase was revealed, and it is associated with the impurities of the initial CrFeCoNi powder. The AM CrFeCoNi system demonstrates excellent phase stability inthe solid solution for all annealing temperatures.

AB - Additive manufacturing (AM) of high-entropy alloys (HEAs) is a new challenge in the Material Science and Advanced Manufacturing fields. In the AM processing procedure, heat treatments after fabrication are often beneficial to stabilize microstructure and properties, while limited reports are available for AM HEAs. In the current study, the effect of a post-printing heat treatment at 400–1000 ℃ for 24 h and for 21 days on the changes in structures and phase compositions of an AM CrFeCoNi alloy prepared by the laser powder bed fusion AM technique is presented to better understand a heat treatment-microstructure-property relationship of the AM HEA. Heating up to 600 ℃ demonstrated the polygonization process in the alloy. Grain growth was observed in the alloy upon heating over 700 ℃, while a preferred texture is observed along the build direction after annealing at 900 ℃ for 24 h. The formation of the secondary phase was revealed, and it is associated with the impurities of the initial CrFeCoNi powder. The AM CrFeCoNi system demonstrates excellent phase stability inthe solid solution for all annealing temperatures.

KW - A: high-entropy alloy

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KW - C: structural evolution, phase composition

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VL - 889

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Phase and structural changes during heat treatment of additive manufactured CrFeCoNi high-entropy alloy

Abstract

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Keywords

UN SDGs

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