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KMID : 1102020220520010014
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Applied Microscopy
2022 Volume.52 No. 1 p.14 ~ p.14
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EPMA quantification on the chemical composition of retained austenite in a Fe-Mn-Si-C-based multi-phase steel
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Heo Yoon-Uk
Jeong Chang-Gon
Kim Soo-Hyun
Yoon Gun-Young
Trang T. T. T.
Woo Young-Yun
Yoon Eun-Yoo
Lee Young-Seon
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Abstract
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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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KEYWORD
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EPMA quantification, Retained austenite, Multi-phase steel, XRD, Carbon content
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