Simulation of κ-carbide precipitation kinetics in aged low-density Fe–Mn–Al–C steels and its effects on strengthening

Jaeeun Lee; Siwook Park; Hwangsun Kim; Seong Jun Park; Keunho Lee; Mi Young Kim; Phaniraj P. Madakashira; Heung Nam Han

doi:10.1007/s12540-018-0089-4

Simulation of κ-carbide precipitation kinetics in aged low-density Fe–Mn–Al–C steels and its effects on strengthening

Jaeeun Lee, Siwook Park, Hwangsun Kim, Seong Jun Park, Keunho Lee, Mi Young Kim, Phaniraj P. Madakashira, Heung Nam Han

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

37 Scopus citations

Abstract

Fe–Al–Mn–C alloy systems are low-density austenite-based steels that show excellent mechanical properties. After aging such steels at adequate temperatures for adequate time, nano-scale precipitates such as κ-carbide form, which have profound effects on the mechanical properties. Therefore, it is important to predict the amount and size of the generated κ-carbide precipitates in order to control the mechanical properties of low-density steels. In this study, the microstructure and mechanical properties of aged low-density austenitic steel were characterized. Thermo-kinetic simulations of the aging process were used to predict the size and phase fraction of κ-carbide after different aging periods, and these results were validated by comparison with experimental data derived from dark-field transmission electron microscopy images. Based on these results, models for precipitation strengthening based on different mechanisms were assessed. The measured increase in the strength of aged specimens was compared with that calculated from the models to determine the exact precipitation strengthening mechanism.

Original language	English
Pages (from-to)	702-710
Number of pages	9
Journal	Metals and Materials International
Volume	24
Issue number	4
DOIs	https://doi.org/10.1007/s12540-018-0089-4
State	Published - Mar 12 2018
Externally published	Yes

Funding

This work was supported by the Materials and Components Technology Development Program (10048157) funded by the Ministry of Trade, Industry and Energy (MOTIE, Korea), and the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT & Future Planning (MSIP) (No. NRF- 2015R1A5A1037627). The Institute of Engineering Research at Seoul National University provided research facilities for this work. Acknowledgements This work was supported by the Materials and Components Technology Development Program (10048157) funded by the Ministry of Trade, Industry and Energy (MOTIE, Korea), and the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT & Future Planning (MSIP) (No. NRF-2015R1A5A1037627). The Institute of Engineering Research at Seoul National University provided research facilities for this work.

Funders	Funder number
Ministry of Trade, Industry and Energy
Ministry of Science, ICT and Future Planning	NRF-2015R1A5A1037627
National Research Foundation of Korea	2015R1A5A1037627

Keywords

Aging
Low-density steel
Numerical simulation
Precipitation
κ-Carbide

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10.1007/s12540-018-0089-4

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title = "Simulation of κ-carbide precipitation kinetics in aged low-density Fe–Mn–Al–C steels and its effects on strengthening",

abstract = "Fe–Al–Mn–C alloy systems are low-density austenite-based steels that show excellent mechanical properties. After aging such steels at adequate temperatures for adequate time, nano-scale precipitates such as κ-carbide form, which have profound effects on the mechanical properties. Therefore, it is important to predict the amount and size of the generated κ-carbide precipitates in order to control the mechanical properties of low-density steels. In this study, the microstructure and mechanical properties of aged low-density austenitic steel were characterized. Thermo-kinetic simulations of the aging process were used to predict the size and phase fraction of κ-carbide after different aging periods, and these results were validated by comparison with experimental data derived from dark-field transmission electron microscopy images. Based on these results, models for precipitation strengthening based on different mechanisms were assessed. The measured increase in the strength of aged specimens was compared with that calculated from the models to determine the exact precipitation strengthening mechanism.",

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author = "Jaeeun Lee and Siwook Park and Hwangsun Kim and Park, {Seong Jun} and Keunho Lee and Kim, {Mi Young} and Madakashira, {Phaniraj P.} and Han, {Heung Nam}",

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AU - Kim, Hwangsun

AU - Park, Seong Jun

AU - Lee, Keunho

AU - Kim, Mi Young

AU - Madakashira, Phaniraj P.

AU - Han, Heung Nam

N1 - Publisher Copyright: © The Korean Institute of Metals and Materials 2018.

PY - 2018/3/12

Y1 - 2018/3/12

N2 - Fe–Al–Mn–C alloy systems are low-density austenite-based steels that show excellent mechanical properties. After aging such steels at adequate temperatures for adequate time, nano-scale precipitates such as κ-carbide form, which have profound effects on the mechanical properties. Therefore, it is important to predict the amount and size of the generated κ-carbide precipitates in order to control the mechanical properties of low-density steels. In this study, the microstructure and mechanical properties of aged low-density austenitic steel were characterized. Thermo-kinetic simulations of the aging process were used to predict the size and phase fraction of κ-carbide after different aging periods, and these results were validated by comparison with experimental data derived from dark-field transmission electron microscopy images. Based on these results, models for precipitation strengthening based on different mechanisms were assessed. The measured increase in the strength of aged specimens was compared with that calculated from the models to determine the exact precipitation strengthening mechanism.

AB - Fe–Al–Mn–C alloy systems are low-density austenite-based steels that show excellent mechanical properties. After aging such steels at adequate temperatures for adequate time, nano-scale precipitates such as κ-carbide form, which have profound effects on the mechanical properties. Therefore, it is important to predict the amount and size of the generated κ-carbide precipitates in order to control the mechanical properties of low-density steels. In this study, the microstructure and mechanical properties of aged low-density austenitic steel were characterized. Thermo-kinetic simulations of the aging process were used to predict the size and phase fraction of κ-carbide after different aging periods, and these results were validated by comparison with experimental data derived from dark-field transmission electron microscopy images. Based on these results, models for precipitation strengthening based on different mechanisms were assessed. The measured increase in the strength of aged specimens was compared with that calculated from the models to determine the exact precipitation strengthening mechanism.

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KW - Low-density steel

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Simulation of κ-carbide precipitation kinetics in aged low-density Fe–Mn–Al–C steels and its effects on strengthening

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