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

Journal of Alloys and Compounds
Publication Date
DOI: 10.1016/j.jallcom.2007.02.005
  • Manganese Sulfide
  • Ferritic Steel
  • Hydrogen
  • Diffusion
  • Tritium Autoradiography


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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