抄録
The effects of welding and plastic processing in duplex stainless steel on the susceptibility to hydrogen embrittlement were studied by fractography. In this paper, the crystall graphic fracture planes were determined by the facet pit method and three dimensional images (topographs) were analyzed with Topo-SEM. As the results, the susceptibility of weld metals increased more than that of base metals because of its coherent crystal orientations. The susceptibility to hydrogen embrittlement of base metal subjected plastic deformation decreased and the dominant fracture plane changed from {100} to {110}, {112} with increasing the degree of plastic processing. It is considered that this result is caused by dropping of hydrogen activity due to hydrogen trapping by dislocations.
