Magnetic field induced precipitation behaviour of (Fe,Mo) 6 C alloy carbides in molybdenum alloyed steel

Abstract

Three kinds of alloy carbides Fe_6-xMo_xC were precipitated during the transformation of austenite-to-bainite in molybdenum alloyed steel under the conditions of 12-T magnetic field and conventional treatment. The magnetic field induced Fe atom concentration in Fe_6-xMo_xC carbides was increased. The higher Fe atom content among three carbides (Fe₂Mo₄C, Fe₃Mo₃C and Fe₄Mo₂C) makes magnetic Gibbs free energy decreased remarkably. The measured aspect ratio of (Fe,Mo)₆C carbides was ranged from 1∶1·16 to 1∶1·25, which was consistent with the calculated result according to the minimum energy principle. It was suggested that the high magnetic field had no visible influence on the morphology of (Fe,Mo)₆C carbides.