多重溶接熱サイクルを受けた鋼熱影響部の低温割れ感受性の検討

概要

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It is well known that the under-bead crackings are occured at multipass welds in high-strength steels. In this study, relative susceptibility to hydrogen-assisted cracking in the HT80 steel welds is evaluated by using 2 pass implant method, the simulation technique of weld HAZ (heat affected zone) and the method of hydrogen chargong into the synthetic HAZ. Results indicate that, the shortest incubation time to fracture is observed at the first pass bond region subjected to heat cycle of 500-600℃ at second pass, due to the stress and hydrogen concentration at the part. The morphology of crack growth is predominantly intergranular. Those tendency are observed for both the implant and the simulation tests. Moreover the hydrogen diffusibility is measured at the synthetic HAZ specimen using the trial apparatus.
独立行政法人海上技術安全研究所の論文
1987-05-30