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Hydrogen diffusion and trapping process around MnS precipitates in αFe examined by tritium autoradiography

Authors
Journal
Journal of Alloys and Compounds
0925-8388
Publisher
Elsevier
Publication Date
Identifiers
DOI: 10.1016/j.jallcom.2007.02.005
Keywords
  • Manganese Sulfide
  • Ferritic Steel
  • Hydrogen
  • Diffusion
  • Tritium Autoradiography

Abstract

Abstract Tritium (hydrogen) accumulation and release processes at MnS precipitates and surrounding αFe matrix area at room temperature (RT) were studied by means of tritium autoradiography (TARG) using a pseudo-binary alloy of Fe–MnS. Hydrogen accumulation at the MnS precipitates at RT was clearly observed but only at a limited occasion. The process involves diffusion, solution and trapping in a complex way including a temperature effect. TARG is proved to be a very good technique to obtain hydrogen area profiles in a near surface region, whereas it is only a snap shot at a particular time and temperature. It could lead us to a totally different interpretation of the accumulation process without detailed dependencies of hydrogen diffusivity and solubility in inclusion species and αFe on temperatures.

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