高張力鋼 (HT) 溶接継手における疲れき裂の発生, 伝ぱと破面のフラクトグラフィ

概要

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Study of fatigue strength and the crack initiation and propagation on notched specimens and welded joints of high strength steel were carried out. On this experiments, difference of the high strength steel and the mild steel was checked. The main results are summarized as follows : (1) In the notched specimens, the HT specimens have larger notch sensitivity than mild steel specimens. However the fatigue strength of HT specimens has higher than that of mild steel specimens in the case of tip radius of notch is greater than 0.1mm. (2) In the welded joint specimens, the HT specimens have somewhat higher fatigue strength than mild steel specimens on the following four sections of joints; base metal, heat affected zone, bond and weld metal. The crack propagation rates on the four sections of joints of HT specimens are shown as follows; Bond>Weld metal>HAZ>Base metal. In contrast, the crack propagation rates of mild steel specimens are almost the same on the four sections of joints.
社団法人溶接学会の論文
1980-08-05