AlN-assisted internal oxidation behavior in Al-containing high Mn steels

Lee, Dongwon; Heo, Yoon-Uk; Lee, Jae Sang; Cho, Won-Tae; Kang, Myeong-Hun; Yim, Chang Hee

doi:10.1016/j.matchar.2022.111967

Cited by 10 publications

(3 citation statements)

References 36 publications

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“…EPMA determines the chemical composition accurately due to its high energy resolution (~ 10 eV) (Williams and Carter 2009 ). The elemental map confirms the relative intensity difference of individual elements in the various phases, including precipitate, inclusion, and matrix phases (Lee et al 2022 ; Han et al 2021 ). Although there was an effort to quantify the X-ray intensity without a standard specimen (Trincavelli et al 2014 ), the obtained intensity is generally quantified by comparing it with the intensities of standard specimens where their chemical compositions have already been determined.…”

Section: Introductionmentioning

confidence: 57%

EPMA quantification on the chemical composition of retained austenite in a Fe-Mn-Si-C-based multi-phase steel

et al. 2022

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An electron probe X-ray microanalyzer (EPMA) is an essential tool for studying chemical composition distribution in the microstructure. Quantifying chemical composition using standard specimens is commonly used to determine the composition of individual phases. However, the local difference in chemical composition in the standard specimens brings the deviation of the quantified composition from the actual one. This study introduces how to overcome the error of quantification in EPMA in the practical aspect. The obtained results are applied to evaluate the chemical composition of retained austenite in multi-phase steel. Film-type austenite shows higher carbon content than blocky-type one. The measured carbon contents of the retained austenite show good coherency with the calculated value from the X-ray diffraction.

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Section: Introductionmentioning

confidence: 57%

EPMA quantification on the chemical composition of retained austenite in a Fe-Mn-Si-C-based multi-phase steel

et al. 2022

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“…EPMA determines the chemical composition accurately due to its high energy resolution (~ 10 eV) [Williams & Carter, 2009]. The elemental map con rms the relative intensity difference of individual elements in the various phases, including precipitate, inclusion, and matrix phases [Lee et al, 2022;Han et al, 2021]. Although there was an effort to quantify the X-ray intensity without a standard specimen [Trincavlli et al, 2014], the obtained intensity is generally quanti ed by comparing it with the intensities of standard specimens where their chemical compositions have already been determined.…”

Section: Introductionmentioning

confidence: 99%

EPMA quantification on the chemical composition of retained austenite in a Fe-Mn-Si-C-based multi-phase steel

Heo

Jeong

Kim

et al. 2022

Preprint

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“…Mnoxides form in layers, sharing Mn ions through "tunnel" structures. It has been stated in [81] that nucleation of MnO occurs at NiAl via MnAl2O4, with the eventual transition to MnO in conventional high Mn-content steels.…”

Section: Mnomentioning

confidence: 99%

Investigation of Oxidation Performance of Co-Cr-Fe-Ni based High Entropy Alloys in Supercritical-CO2 Environment

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This work presents the first oxidation studies of Co-Cr-Fe-Ni-based high entropy alloys (HEAs) in supercritical-CO2 (sCO2) environment. These materials are being evaluated as an alternative to commercial Ni-based superalloys for construction of select components of sCO2 power cycles. The alloys investigated in this research include CoCrFeMnNi, Al0.5CoCrFeMnNi1.5, Al0.5CoCrFeNi1.5, (CoCrFeMnNi)Si0.01, and CoCrFe0.5MnNi1.5 specifically designed to study the impact of Mn, Al, Si and Fe on the oxidation behaviour. The HEAs were characterized through scanning electron microscopy (SEM), energy-dispersive Xray spectroscopy (EDS), X-ray diffraction before and after exposure to sCO2. The samples were tested inside a high pressure sCO2 corrosion test rig located at Natural Resources Canada's, capable of mimicking the operating conditions of indirectly-fired sCO2 power cycles. The oxidation behaviour was evaluated by comparing experimentally obtained mass gain data and the characterized oxide formations. The pre-exposure results show that Al0.5CoCrFeMnNi1.5 and Al0.5CoCrFeNi1.5 compositions form γ/γ' microstructure, desirable for high strength applications, while the exposure to sCO2 at elevated temperatures (500-700°C) and pressure (20 MPa) causes formation of ordered B2 NiAl phases dispersed within the matrix. Al0.5CoCrFeNi1.5 is the only composition that forms detectable protective Cr2O3 after 300 hours at 500°C/20MPa, as well as after 600 hours at 700°C/MPa. The other four compositions were shown to form a porous unprotective MnO oxide layer. Additionally, the results indicate that similar to conventional alloy systems, the oxidation of HEAs increases with temperature, however, Al0.5CoCrFeNi1.5 exhibited nearly the same mass gain at both temperatures after 300 and 600 hours. Lastly, the results suggest that Al0.5CoCrFeNi1.5 composition has the potential to outperform commercial superalloys in sCO2 applications.

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AlN-assisted internal oxidation behavior in Al-containing high Mn steels

Cited by 10 publications

References 36 publications

EPMA quantification on the chemical composition of retained austenite in a Fe-Mn-Si-C-based multi-phase steel

EPMA quantification on the chemical composition of retained austenite in a Fe-Mn-Si-C-based multi-phase steel

EPMA quantification on the chemical composition of retained austenite in a Fe-Mn-Si-C-based multi-phase steel

Investigation of Oxidation Performance of Co-Cr-Fe-Ni based High Entropy Alloys in Supercritical-CO2 Environment

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