Abstract
A theory and verifying experimental data are presented to explain strain aging of iron and steel under several aging strains, stresses and temperatures. The theory developes a relation between the number of solute atoms migrating to a dislocation and the aging time which eventually leads to saturation. A term to account for the bulk diffusion which is due to the carbon concentration gradient developed in the vicinity of the dislocation is also included. The experimental results show the relation between the increase of the yield point after aging and the aging time. Both the theory and the experimental results differ from Harper's, Bullough and Newman's and Ham's formulas.
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