Abstract
Changes in microstructure, hardness and magnetic properties of the Fe-Cr-Co-Mo alloy were examined under the influence of isothermal tempering and with optimum heat-treatment. At a temperature of 1350 K the alloy shows considerable increase in hardness which is connected with the separation of the phase σ. The temperature of 1350 K should be recognized as the lower limit of hot-working. The alloy obtains optimum magnetic properties after multistage ageing between 870 and 810 K with previous thermomagnetic treatment at 910 K. The greatest changes in magnetic properties take place in the first two stages of ageing (870 K, 2 h; and 850 K, 2 h), whereas in further stages only (BH) max increases. During tempering, in the 870 to 810 K range, the microstructure does not change. A slight overstepping of temperature to 910 K during thermomagnetic treatment causes precipitation of the σ phase, growth occurring at multistage ageing.
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References
K. Kaneko, M. Homma and K. Nakamura, AI Conf. no. 5 (1972) 1088.
K. Kaneko, M. Homma, K. Nakamura and M. Miura, IEEE Trans. Mag. 8 (1972) 347.
K. Kaneko, M. Homma, T. Fukuda and M. Okada, ibid 11 (1975) 1440.
D. Chandra and L. H. Schwartz, Met. Trans. 2 (1971) 511.
R. Cremer and I. Pfeiffer, Physica 80B (1975) 164.
J. W. Chan, J. Appl. Phys. 34 (1963) 3581.
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Szymura, S., Sojka, L. Permanent magnetic properties of Fe-Cr-Co-Mo alloy. J Mater Sci 14, 1890–1892 (1979). https://doi.org/10.1007/BF00551028
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DOI: https://doi.org/10.1007/BF00551028