Fundamental Researches on the Welded joint of High Carbon steel (Report 3) -On the Impact Properties in Weld Heat-affected Zone of Rail-

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  • 高炭素鋼の溶接継手に関する基礎的研究(第３報) -レール溶接熱影響部の衝撃特性について-
  • コウ タンソ コウ ノ ヨウセツ ツギテ ニ カンスル キソテキ ケンキュウ

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The authors previously reported the impact properties and the fatigue properties of simulated welded-heat affected zone of the welded joint of high carbon steel in Report 1 and Report 2. The correlations among the heat treatment temperature, the sorbitic and pearlitic micro-structure, the grain size, the testing temperature and the notch toughness were reported by using high carbon rail steel. In the present report, the impact properties of the heat affected zone of as-rolled rail which was welded by means of enclosed arc welding in the same way as in field welding were investigated. It was clarified that the impact properties become better as the structure becomes finer and that the fractured surface of charpy impact test specimen shows the brittle fracture at the testing temperatures below the normal temperature.

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