インプラント法による高張力鋼の再熱割れ感受性の評価 : Cr-Mo 鋼の再熱割れに関する研究第 1 報

概要

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The modified implant test was newly proposed in this paper as the suitable method for evaluating the sensitivity of the reheat cracking which has occasionally occurred in the welded zone of high strength steels. It was confirmed from the experimental results of the commercial high strength steels that the reheat cracking sensitivity could be compared by the critical value of the initial restraint stress obtained from the modified implant test. And the T-1 type high strength steel which contained both chromium and molybdenum was more sensitive to the reheat cracking than the chromium free high strength steel. The critical value of the initial restraint stress was determined by two factors; the critical value of the restraint stress after the post weld heat treatment and the stress relaxation characterestics. The reheat cracking sensitivity of the synthetic Ni-Cr-Mo steels were examined. As the results, the addition of nickel increased the reheat cracking sensitivity of the Cr-Mo steels only when its content exceeded 1.5%.
1981-12-05