Observation of Hydrogen Distribution in V₃₅Cr₄₀Ti₂₅ Alloy by Tritium Radioluminography

Abstract

Hydrogen distribution in a V₃₅Cr₄₀Ti₂₅ alloy with a BCC structure has been quantitatively examined to obtain a mapping image of hydrogen by tritium radioluminography. It has been found that the hydrogen concentration has been varied depending on the position on the surface of the specimen. The hydrogen distribution has been compared with the mapping images of constituent elements observed by the wavelength dispersive X-ray spectrometry. In the heat affected region which contacted with water-cooled copper hearth during the arc-melting, hydrogen concentration has correlated with the distribution of titanium, that is, hydrogen concentration is higher at the titanium enriched region. Whereas, at the slowly solidified and rapidly solidified regions, there is no relation between hydrogen distribution and the constituent elements. In this region, hydrogen distribution depends on the morphology of the interdendritic segregation of titanium.