Effect of Heat Treatment on the Strain Gauge Factor of the Fe-Cr-Co System

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  • Fe-Cr-Co系合金の抵抗歪率におよぼす熱処理の影響について
  • Fe Cr Coケイ ゴウキン ノ テイコウ ヒズミリツ ニ オヨボス ネツ

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Abstract

Fe-Cr-Co alloys containing less than 30% chromium and less than 70% cobalt were heated in vacuum over the temperature range of 500∼1000°C for 1 h and then furnace-cooled after cold-drawing by about 98% reduction in area. Measurements of the strain gauge factor and electrical properties at room temperature were carried out for the alloys.<BR>Generally, with increasing annealing temperature, the strain gauge factors of the Fe-Cr-Co alloys decreased gradualy to a minimum at about 500°C and increased sharply to a maximum at 800°C. In this system, an Fe-15%Cr-30%Co alloy showed a maximum strain gauge factor of 7.3, and an electrical resistivity of 0.78 μΩm at room temperature and its temperature coefficient of 100×10−5/°C. The thermo-electromotive force relative to copper was −1.2 μV/°C for this alloy.

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