Effects of carbon content on microstructures and magnetic properties of annealed or solution treated Fe-Cr-Ni-C alloys |
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Authors: | S Yokoyama T Inui Y Minamino |
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Affiliation: | (1) Metallurgical Research Laboratory, Hitachi Metals, Ltd., 2107-2 Yasugi-cho Yasugi, Shimane, 692-8601, Japan;(2) Department of Adaptive Machine Systems, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka, 565-0871, Japan |
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Abstract: | The correlations between microstructures and magnetic properties were studied in four Fe-17.5 mass%Cr-2.0 mass%Ni-Xmass%C (X = 0.3–0.6) alloys. Each alloy consisted of ferromagnetic and M23C6 carbide phases by step-annealing at 1053 K and 848 K. The number of the M23C6 carbide particles increased with the carbon content, and this microstructural variation caused a deterioration of the soft magnetic properties. On the other hand, the alloy with 0.3 mass% carbon content consisted of ferromagnetic ![agr](/content/g15p0460324072k2/xxlarge945.gif) and paramagnetic retained structures after solution treatment at 1473 K. The amount of the stable structure increased with the carbon content, while the amount of the ![agr](/content/g15p0460324072k2/xxlarge945.gif) structure decreased. This microstructural variation caused a decrease in the relative permeability, r, and the stabilization of the paramagnetic property to low temperatures below room temperature. The temperature stability of the r values was closely related to the martensite start temperature, M
s. From an equation for the estimation of M
s from the chemical compositions of the phase, the M
s's of the alloys with 0.3, 0.4, 0.5 and 0.6 mass%C were estimated to be 326, 289, 241 and 216 K respectively. These values were consistent with the M
s's expected from the microstructures and temperature dependences of the r values. |
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