Abstract
An Fe–Ni–Co alloy containing acicular martensite has been partially reversed in the temperature region 525° to 725°C and the influence of the reversed microstructure on the coercive force-temperature (Hc-T) relationship has been determined up to 500°C. In all cases, an increase in Hc was observed at θγ, the Curie temperature of the austenite. For reverse annealing temperatures up to 590°C, Hc was increased at all temperatures; for higher reverse annealing temperatures, Hc decreased at all temperatures, but the increase in Hc at θγ was found to be more abrupt. These observations are correlated with the microstructure resulting from the shear-like martensite-to-austenite reverse transformation.
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