日本金属学会誌

J. Japan Inst. Metals, Vol. 48, No. 2 (1984),
pp. 227-232

Damping Capacity and Pitting Corrosion Resistance of Fe-Co-Cr Alloys

Hakaru Masumoto1, Masakatsu Hinai1 and Showhachi Sawaya1

1The Research Institute of Electric and Magnetic Alloys, Yagiyama-Minami, Sendai, 982

Abstract:

The damping capacity, the magnetic property and the anodic polarization behavior were investigated on ternary Fe-Co-Cr alloys with Co less than 30% and Cr less than 40%. Measurements of the internal friction Q-1, the coercive force Hc and the pitting potential Ep were carried out using an inverted torsion pendulum, an automatic recording fluxmeter and a potentiostat, respectively.
In the furnace-cooled state, a fairly high Q-1 value was obtained in two composition ranges of Fe-3--5%Co-17--22%Cr and Fe-5--25%Co-0--5%Cr. Upon water-quenching, the Q-1 value of alloys containing a large amount of Cr increased remarkably, but that of the alloys containing a small amount of Cr decreased considerably.
The Q-1 of the alloys in the state of α solid solution was very high because of the small Hc. The alloys, in which the α -γ transformation strain remained and the σ , γ or ε phases precipitated in the α phase matrix, were lower in Q-1 because of the large Hc.
In all cases the Fe-Cr binary alloys became higher in Ep with increasing Cr content, and the Co addition resulted in a further increase. The Ep of the water-quenched alloys was generally higher than that of the furnace-cooled alloys.


(Received 1983/09/14)

Keywords:

damping capacity, internal friction, high damping material, pitting corrosion, anodic polarization, ion-cobalt-chromium alloy, coercive force, tensile strength


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