Internal Friction Measurements on Iron and Steels

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  • 鉄及び炭素鋼の内部摩擦測定
  • テツ オヨビ タンソ コウ ノ ナイブ マサツ ソクテイ

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Abstract

The internal friction in iron and steels was measured as a function of temperature, using a torsion pendulum at about 1.9 cps. Vacuum-melted electrolytic iron with low nitrogen content (0.004%) exhibits, in addition to a Snoek damping peak, a stress-relaxation peak at about 500°C and 550°C respectively. However,the vacuum-melted electrolytic iron treated with wet hydrogen exhibits a stress-relaxation peak at about 500°C. The first peak manifested at about 500°C is a grain-boundary stress-relaxation peak, and the second peak at 550°C is the solid-solution peak accompanying the presence of nitrogen in solid solution in α-iron. Armco iron recrystallized at 650°C after cold drawing exhibits a pronounced solid-solution peak at about 570°C. The activation energy of the solid-solution peak in Armco iron is 64,000 cal/mol. The peak is characterized by a distribution of relaxation times. The peak decreases markedly by the precipitation of cementite at the grain interfaces. The peak is considered to be a grain-boundary peak for the solid-solution of carbon in α-iron. In annealed states, the Snoek damping peak in medium and high carbon steels cannot be detected, and a material recrystallized at 650°C after cold-drawing exhibits a smaller Snoek damping peak than the same material annealed at above A3−1. The Snoek damping peak in iron is markedly affected by A3 transformatiom.

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