Study of Aging Behaviors in Hot-Rolled Low Carbon Steels

by J.K.Chen

Publisher - China Steel Corp.

Category - General Novel

Lüders strain and aging index were employed to characterize the aging properties of hot rolled low carbon steels during production. The Lüders strain was found to increase with aging time while the aging index decreased. It is interpreted that the aging index represents the susceptibility of steels to aging, while the Lüders strain measures the effects of carbon and nitrogen atmosphere pinning on dislocations. Empirical equations were derived to represent the change of the Lüders strain with time. By comparing accelerated aging with room temperature real time aging behaviors of low carbon steels for up to two years, the activation energy for solute carbon and nitrogen migration was estimated to be 86,578J/mole. The equation derived for accelerated aging of hot-rolled low carbon steels understudy was in reasonable agreement with that reported in the literature.

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