Abstract
Influences of neutron irradiation and dry hydrogen treatment on yield point phenomena in mild steel were examined. Static strain-aging studies were performed on vacuum-annealed, dry-hydrogen-treated and neutron-irradiated samples. Hardening due to neutron radiation damage exhibited a cube root dependence of the fluence. In addition to an increase in the lower yield stress, the Lüder strain increased with dose up to 10 18 neutrons cm −2, and at higher doses an apparently rounded yield was observed because of fracture during the Lüder straining. The increase in the Lüder strain followed a (Φt) 1 3 law, similar to that for radiation hardening. Static strain-aging studies revealed a complex time dependence of the strain-aging index f and seem to illustrate a two-stage process: initially, atmosphere locking and, for long aging times, locking due to precipitation. The effect of neutron irradiation was very similar to the effect of dry hydrogen treatment; the rate of aging decreased and, at high fluences (or longer exposures to dry hydrogen), essentially non-aging steel was obtained. However, the kinetics and/or mechanism of strain aging are not affected by neutron radiation (or dry hydrogen treatment).
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