Effect of Rolling Direction on Hydrogen Induced Crack Propagation Behavior in HT-80 Welds

概要

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It is an important trial to observe hydrogen induced crack (HIC) initiation and propagation during or after welding. This wark was done to establish a direct observation method of the HIC propagation under tensile loading simulating real structures and to clarify the effect of rolling direction on the HIC propagation behavior. Specimen of HT-80 was deposited with a low hydrogen type electrode. Welded specimen was loaded by a hydraulic jack to a certain load under the optical microcrope observation. The HIC initiated at the center of weld bead and propagaetd into the heat affected zone. The HIC propagated intermittently through HAZ with severe plastic deformation and branching of the crack path. The SEM observation on the fractured surface revealed typical HIC appaerance with hydrogen quasi-cleavage fracture.
社団法人溶接学会の論文
1989-10-01