Correlation of residual stresses with magnetic properties of Armco iron

This paper studies the applicability of magnetic parameters for testing residual stresses in ferromagnetic structural steels. A unique correlation of the coercive force, initial magnetic permeability, reversible magnetic permeability in the remanent state, and the ratio of initial to reversible permeability with the level of microstresses for Armco iron is established. Thus, the prospects of using these parameters for the evaluation of residual stresses in ferromagnetic structural materials are demonstrated. It is shown that the ratio of reversible magnetic permeability in the remanent state to initial magnetic permeability is the most sensitive to the variation of microstresses.