Study of Consumable-Electrode Arc-melted Timken 16-25-6

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  • 消耗電極式アーク溶解したTimken 16-25-6の諸性質
  • ショウモウ デンキョクシキ アーク ヨウカイ シタ Timken 16-25-6 ノ ショ セイシツ

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A sound ingot of Timken 16-25-6 was produced by consumable-electrode arc-remelting in the atmosphere of 100 mmHg argon. The content of oxygen and non-metallic inclusions markedly decreased but nitrogen and almost all the other elements were not affected. The forging specimens were water-quenched from various temperatures of 700° to 1200°C. They showed the maximum hardness after treatment at 800°C and complete softening at 1100°C. In this temperature range the arc-remelted specimen showed a high hardness. As to the precipitation behavior of air-melted and arc-remelted specimens, the former showed more uniform distribution than the other in the case of 15% hot-cold work at 850°C, but no difference exisisted between them in the case of aging for 24 hr at 700°C after solution treatment at 1150°C. The arc-remelted one had larger tensile strength and yield strength after both treatments mentioned above, and after hot-cold working it had a perceptibly larger elongation and reduction of area. The arc-remelted specimen had relatively large elongation and reduction of area in the tensile tests at 650°C. The rupture time of arc-remelted one after hot-cold working increased to 2 or 3 times of that of air-melted one in the creep rupture tests of the stress of 35 kg/mm2, 27 kg/mm2 and 23 kg/mm2 at 650°C. The two specimens after aging showed no difference in this connection.

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