Presentation Numerical Simulation of Hydrogen Distribution during Multi-pass Welding for Reduced Activation Ferritic/martensitic Steel F82H

Mori, Hiroaki  ,  Hatoya, Kohei  ,  Kawauchi, Kento  ,  加藤, 太一朗  ,  廣瀬, 貴規  ,  谷川, 博康

Reduced activation ferritic/martensitic steel F82H has been developed for one of the construction material of blanket modules set on the inner wall of nuclear fusion reactors. When the steel is welded, cold cracking in heat affected zone (HAZ) has to be considered, because martensite is prone to form in HAZ as well as 9Cr-1Mo steel. Especially, in the case of multi-pass welding, its susceptibility should be remarkably higher than that in single-pass welding. Therefore, hydrogen concentrations in welds, which is well known as a cause of cold cracking, was evaluated by numerical analysis with combination of thermal elastic-plastic analysis and the developed simulation code to calculate hydrogen distribution. As dynamic calculation, tensile stress, which is closely equivalent to its yield stress, mainly occurred around fusion line. From calculation of hydrogen distribution, considering stresses and strains generated in multi-pass welds, hydrogen was concentrated at along fusion line.
Materials Science & Technology 2017

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