Effects of Heat Treatment on the Magnetic Properties and Dimension Accuracy of Fe-12%Al Soft-Magnetism Alloy

Abstract

Theoretical analysis and experiment all show that heat stress has effect on the accuracy of Fe-12%Al soft-magnetism alloy’s dimension after heat treatment and also heat treatment process has effect on magnetic property and also the stress caused by machining has effect on magnetic property. A kind of new method is proposed to improve the magnetic property and accuracy of dimension of soft-magnetism alloy after heat treatment, in which the first step is to perform half-finish machining on soft-magnetism alloy material and leave a one-side margin 0.05mm, and the second step is to perform heat treatment and then finish machining during which some degree of tolerance margin is required to be set if the requirement of magnetic property is satisfied and last step is to the renewing magnetism treatment. This method can guarantee the high accuracy of soft magnetism alloy’s dimension as well as can renew the lost of magnetic property by 75%-91% which will improve the passing rate by almost double.