The e!ect of microstructural change during isothermal heat treatment on structure-sensitive magnetic properties hasbeen investigated for 1Cr}1Mo}0.25V steel. Magnetic permeability increased, but coercive force and Vickers hardnessdecreased as ageing time increased. During the isothermal heat treatment, Mn23C6and (Cr2.5Fe4.3Mo0.1)C3carbideswere found at grain...
