Interpretation of cryogenic-temperature Charpy fracture initiation and propagation energies by microstructural evolution occurring during dynamic compressive test of austenitic Fe-(0.4,1.0)C-18Mn steels

Hyunmin Kim; Jaeyoung Park; Joong Eun Jung; Seok Su Sohn; Sunghak Lee

doi:10.1016/j.msea.2015.05.095

Interpretation of cryogenic-temperature Charpy fracture initiation and propagation energies by microstructural evolution occurring during dynamic compressive test of austenitic Fe-(0.4,1.0)C-18Mn steels

Hyunmin Kim, Jaeyoung Park, Joong Eun Jung, Seok Su Sohn, Sunghak Lee

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

51 Citations (Scopus)

Abstract

In the present study, Charpy impact energy (E_T) composed of fracture initiation energy (E_I) and propagation energy (E_P) of austenitic Fe-(0.4,1.0)C-18Mn steels was evaluated in the temperature range from room to cryogenic temperatures by an instrumented Charpy impact tester, and was interpreted by microstructural evolution of dynamically compressed specimens. In the 1.0C-18Mn steel, the E_I and E_P decreased slightly with decreasing temperature, but the E_P/E_T ratio was kept to be about 0.5. In the 0.4C-18Mn steel, the E_I remained almost constant or slightly decreased with decreasing temperature, while the E_P/E_T ratio steadily decreased, thereby leading to the lower (about 30%) cryogenic-temperature E_T than that of the 1.0C-18Mn steel. Under the dynamic compressive loading, a considerable number of ε-martensites were formed in the 0.4C-18Mn steel, whereas they were not found in the 1.0C-18Mn steel, and their volume fractions increased steadily with decreasing temperature. This γ→ε-martensite transformation was attributed to the decrease in stacking fault energy, and resulted in the very low E_P and resultant E_T.

Original language	English
Pages (from-to)	340-347
Number of pages	8
Journal	Materials Science and Engineering: A
Volume	641
DOIs	https://doi.org/10.1016/j.msea.2015.05.095
Publication status	Published - 2015 Jul 4
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2015 Elsevier B.V.

Keywords

Cryogenic temperature
Dynamic compressive test
High-Mn steel
Instrumented Charpy impact toughness
Martensitic transformation
Twin

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering

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10.1016/j.msea.2015.05.095

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Interpretation of cryogenic-temperature Charpy fracture initiation and propagation energies by microstructural evolution occurring during dynamic compressive test of austenitic Fe-(0.4,1.0)C-18Mn steels. / Kim, Hyunmin; Park, Jaeyoung; Jung, Joong Eun et al.
In: Materials Science and Engineering: A, Vol. 641, 04.07.2015, p. 340-347.

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

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title = "Interpretation of cryogenic-temperature Charpy fracture initiation and propagation energies by microstructural evolution occurring during dynamic compressive test of austenitic Fe-(0.4,1.0)C-18Mn steels",

abstract = "In the present study, Charpy impact energy (ET) composed of fracture initiation energy (EI) and propagation energy (EP) of austenitic Fe-(0.4,1.0)C-18Mn steels was evaluated in the temperature range from room to cryogenic temperatures by an instrumented Charpy impact tester, and was interpreted by microstructural evolution of dynamically compressed specimens. In the 1.0C-18Mn steel, the EI and EP decreased slightly with decreasing temperature, but the EP/ET ratio was kept to be about 0.5. In the 0.4C-18Mn steel, the EI remained almost constant or slightly decreased with decreasing temperature, while the EP/ET ratio steadily decreased, thereby leading to the lower (about 30%) cryogenic-temperature ET than that of the 1.0C-18Mn steel. Under the dynamic compressive loading, a considerable number of ε-martensites were formed in the 0.4C-18Mn steel, whereas they were not found in the 1.0C-18Mn steel, and their volume fractions increased steadily with decreasing temperature. This γ→ε-martensite transformation was attributed to the decrease in stacking fault energy, and resulted in the very low EP and resultant ET.",

keywords = "Cryogenic temperature, Dynamic compressive test, High-Mn steel, Instrumented Charpy impact toughness, Martensitic transformation, Twin",

author = "Hyunmin Kim and Jaeyoung Park and Jung, {Joong Eun} and Sohn, {Seok Su} and Sunghak Lee",

note = "Publisher Copyright: {\textcopyright} 2015 Elsevier B.V.",

year = "2015",

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doi = "10.1016/j.msea.2015.05.095",

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AU - Kim, Hyunmin

AU - Park, Jaeyoung

AU - Jung, Joong Eun

AU - Sohn, Seok Su

AU - Lee, Sunghak

PY - 2015/7/4

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N2 - In the present study, Charpy impact energy (ET) composed of fracture initiation energy (EI) and propagation energy (EP) of austenitic Fe-(0.4,1.0)C-18Mn steels was evaluated in the temperature range from room to cryogenic temperatures by an instrumented Charpy impact tester, and was interpreted by microstructural evolution of dynamically compressed specimens. In the 1.0C-18Mn steel, the EI and EP decreased slightly with decreasing temperature, but the EP/ET ratio was kept to be about 0.5. In the 0.4C-18Mn steel, the EI remained almost constant or slightly decreased with decreasing temperature, while the EP/ET ratio steadily decreased, thereby leading to the lower (about 30%) cryogenic-temperature ET than that of the 1.0C-18Mn steel. Under the dynamic compressive loading, a considerable number of ε-martensites were formed in the 0.4C-18Mn steel, whereas they were not found in the 1.0C-18Mn steel, and their volume fractions increased steadily with decreasing temperature. This γ→ε-martensite transformation was attributed to the decrease in stacking fault energy, and resulted in the very low EP and resultant ET.

AB - In the present study, Charpy impact energy (ET) composed of fracture initiation energy (EI) and propagation energy (EP) of austenitic Fe-(0.4,1.0)C-18Mn steels was evaluated in the temperature range from room to cryogenic temperatures by an instrumented Charpy impact tester, and was interpreted by microstructural evolution of dynamically compressed specimens. In the 1.0C-18Mn steel, the EI and EP decreased slightly with decreasing temperature, but the EP/ET ratio was kept to be about 0.5. In the 0.4C-18Mn steel, the EI remained almost constant or slightly decreased with decreasing temperature, while the EP/ET ratio steadily decreased, thereby leading to the lower (about 30%) cryogenic-temperature ET than that of the 1.0C-18Mn steel. Under the dynamic compressive loading, a considerable number of ε-martensites were formed in the 0.4C-18Mn steel, whereas they were not found in the 1.0C-18Mn steel, and their volume fractions increased steadily with decreasing temperature. This γ→ε-martensite transformation was attributed to the decrease in stacking fault energy, and resulted in the very low EP and resultant ET.

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KW - Dynamic compressive test

KW - High-Mn steel

KW - Instrumented Charpy impact toughness

KW - Martensitic transformation

KW - Twin

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Interpretation of cryogenic-temperature Charpy fracture initiation and propagation energies by microstructural evolution occurring during dynamic compressive test of austenitic Fe-(0.4,1.0)C-18Mn steels

Abstract

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