高マンガン非磁性材料RM711の透磁率に及ぼす諸因子について (原子力材料<特集>)

概要

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Effect of heat treatment and deformation on permeability of non-magnetic high carbon and high manganese alloy RM711 are studied. The results obtained are as follows:(1) The structure of the RM711 alloy is a stable austenite and the magnetic permeability is low even when RM711 is deformed at high strain.(2) When RM711 is heated in the oxidizing atmosphere, low permeability is obtained between 700°C and 900°C, while the increase of permeability is observed below 700°C and above 900°C. The main cause of the increase of permeability is the formation of ferrimagnetic magnetite Fe3O4 below 700°C and the decarburized layer above 900°C.(3) The decomposition of austenite of RM711 by isothermal treatment occurs below 700°C and the nose temperature is near 600°C. The increase of permeability is considered due to the precipitation of non-equilibrium cementite (i.e. soluble content of Mn in cementite is low) and ferrite.(4) The reaction of decarburization can be explained by the diffusion of carbon in austenite. Permeability values change when the carbon content is less than 0.4% by decarburization.
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