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3報) : 熱影響部組織の機械的性質

概要

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Mechanical properties of microstructures in weld heat affected zone have been studied in this third report by means of the synthetic specimens which were subjected to various weld thermal cycles in a reproducing apparatus as described in the previous report. Firstly, the effects of the maximum heating temperatures, 900, 1100 and 1300 ℃. and the keeping times, 3, 20 and 60 seconds at the peak temperature on the tensile properties of two high strength steels were investigated. The elongation and reduction of area were found to be decreased the more remarkably by the higher heating temperature over 1100℃., especially at 1300℃ and by the more prolonged keeping at 1300℃. The reduction of area was reduced by keeping at 1300℃. for 60 seconds to 1/3 to 1/4 of the reduction of area of the specimen kept for 3 seconds, same with the weld thermal cycle. Secondly, comparison between the elongation of the synthetic specimen and the bend angle at crack initiation in Kommerell type longitudinal bead bend specimen was made for eight high strength steels. A close relationship has been found to exist between the two, and the elongation or reduction of area of the synthetic round bar tensile specimen has been concluded to be a good measure of the bend angle of crack initiation in Kommerell test.
社団法人溶接学会の論文
1958-05-25