On the Relation between Graphitization and Cooling Conditions of Partially Arc Melted Cast Iron

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概要

• 論文の詳細を見る

• Effect of cooling conditions on the graphitization of partially arc melted cast irons were investigated. As test specimens, the cast iron containing ab. 3.3 per cent carbon and 1.5 per cent silicon were used. For the cast iron specimen melted in the central position in TIG arc, various heat-treatments were carried out and annealed at 750℃〜850℃. The following results were obtained. (1) When the arc melting time was increased, tempered graphites became larger, because of the slow cooling rate of the treated specimens. (2) When the specimens were quenched into oil or water after the arc melting, the tempered graphite sizes were almost the same regardless of the time of arc melting. (3) When the cooling rate from molten metal to room temperature increased, a fine tempered graphite was obtained, especially by a rapid cooling from ab. 850℃. A heat-treatment to stabilize the structure before the graphitizing treatment made it difficult to obtain a fine tempered graphite. The results of the present study indicate that in the practical welding of cast iron, pre- and post-heat treatments make the graphitization difficult with the rise of the temperature, because of the decrease of the cooling rate on the weld part.

• 東北大学の論文

著者

• Yamaya Katsunobu

  The Research Institute For Iron Steel And Other Metals

関連論文

• Effect of Preheat and Annealing on the Arc Welding of Cast Iron
• Behaviours of the Precipitates of 17-4 PH Stainless Steel by the Arc Welding Heat
• Welding by Single Bead Test, and Rapid Heating and Cooling Structures of 13% Chromium Stainless Steel
• On the Relation between Graphitization and Cooling Conditions of Partially Arc Melted Cast Iron
• Welding of Cast Iron and Nodular Graphite Cast Steel. II : Arc-Welding of Nodular Graphite Cast Steel
• Welding of Cast Iron and Nodular Graphite Cast Steel. I : Properties of the Heat Affected Zone of Cast Iron

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