熔接熱サイクル再現装置による鋼の熱影響部の冶金的研究(第 5 報) : 熱影響部組織の切欠靱性

概要

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V-Charpy impact properties of the synthetic microstructures in weld heat affected zone produced by various thermal cycles with 1300℃ peak temperature, have been studied for five steels, included one semi-killed and four manganese-silicon high strength. From the results of this study, it was shown that the notch toughness of the test steels, were generally inferior to that of the each original plate, but were significantly improved with an increase of cooling rates during welding. The martensitic structures produced in the coarse grained heat affected zones for the test steels containing lower amounts of carbon, were found to be satisfactory in notch toughness, even for a semi-killed steel. But, in the case of a manganese-silicon steel 5W with higher hardenability, an existence of martensitic structure showed a remarkable loss in notch toughness, probably because of its higher carbon content.
社団法人溶接学会の論文
1959-10-25