Damping Capacity, Magnetic and Mechanical Properties and Corrosion Resistance of Fe-Co-Mo-Cr Alloys

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  • Fe-Co-Mo-Cr系合金の減衰能，磁気的および機械的性質ならびに耐食性
  • Fe Co Mo Crケイ ゴウキン ノ ゲンスイノウ ジキテキ オヨビ キカ

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Abstract

The damping capacity, magnetic and mechanical properties and corrosion resistance have been investigated in Fe-Co-Mo-Cr alloys. The internal friction and magnetic hysteresis measurements, and the tensile test were carried out by using an inverted torsion pendulum, an automatic recording fluxmeter and an Instron-type machine, respectively. The anodic polarization characteristics in 3%NaCl and 5%H2SO4 solutions were measured by a potentiostat method.<BR>The maximum internal friction Qmax−1 depends largely on the change in magnetic properties with alloy composition and heat treatment. In the case of Fe-Co-Mo-Cr alloys containing 20%Cr, fairly high values of Qmax−1 greater than 50×10−3 are obtained upon furnace cooling in the composition range of 2-4%Co and less than 2.5%Mo, and in the composition range of less than 6.5%Co and less than 9.5%Mo upon water quenching.<BR>The Fe-Co-Mo-Cr alloys with high values of Qmax−1 show a microstructure of α single phase and have a moderately small Hc, whereas those with very low values of Qmax−1 show a two-phase microstructure and have very large Hc. Therefore, the larger the magnetic hysteresis loss at a small strain amplitude, the higher the Qmax−1 value becomes.<BR>The tensile strength and the yield strength of the alloys with 4%Co and 20%Cr increase with increasing Mo concentration, but the elongation decreases. The pitting and sulfuric acid corrosion resistances are improved with the increase in Mo concentration, because the pitting potential in NaCl solution increases sharply and the critical current density in H2SO4 solution decreases rapidly.

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