Analytical Study on Hydrogen Induced Cracking in HT-Steel Welds

概要

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Bead on plate welding was carried out on HT-80 high strength steel specimens, which were then placed under an optical microscope to observe the initiation and propagation of hydrogen induced delayed cracking (HIC). In addition, the finite element method (FEM) taking account of stress gradient was employed to analyze the accumulation of diffusible hydrogen around the crack tip under stress. The hydrogen induced crack initiated at the center of the weld bead and propagated through the weld metal into the heat affected zone. The HIC was observed to propagate through the HAZ intermittently in a brittle manner. It was also found that the experimental observations of crack behavior corresponded well with the FEM analysis results predicting the accumulation process of hydrogen around the crack tip.
社団法人溶接学会の論文
1990-10-01