ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Observation of Chemical State for Interstitial Solid Solution of Carbon in Low-carbon Steel by Soft X-ray Absorption Spectroscopy
Kakeru NinomiyaKazutaka KamitaniYusuke TamenoriKazuki TsurutaToshihiro OkajimaDaisuke YoshimuraHideaki SawadaKeisuke KinoshitaMaiko Nishibori
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JOURNALS OPEN ACCESS Advance online publication

Article ID: ISIJINT-2019-206

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Abstract

The near-edge X-ray absorption fine structure at the carbon K edge was measured for determining the chemical state of interstitial carbon in a low-carbon steel. In addition, the wavelength dependence of the photoelectron spectrum of the surface of the steel was evaluated, and a contamination and oxidation layer of 3 nm thickness was found. As a result, it was possible to observe a change in the chemical state of carbon existing in bulk iron located deeper than the oxidation and contamination layers, by evaluating the difference spectra between the sample and a reference. Furthermore, by evaluating the shape change of the difference spectra based on the heat treatment time, it was found that the chemical state of carbon in bulk iron changes with heat treatment.

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© 2019 by The Iron and Steel Institute of Japan
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