Transactions of the Japan Institute of Metals
Online ISSN : 2432-4701
Print ISSN : 0021-4434
ISSN-L : 0021-4434
Study of Consumable Electrode Arc-Melted Timken 16-25-6
Hidetake KusamichiYoshiro YagiShunji Yamamoto
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1963 Volume 4 Issue 1 Pages 38-41

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