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The effects of neutron radiation exposure and nitrogen concentration on dynamic strain-aging characteristics were studied in mild steel. The influence of neutron irradiation was investigated at radiation doses ranging from
The effect of nitrogen concentration on the dynamic strain-aging characteristics was investigated following dry hydrogen treatment at 948 K with nitrogen concentrations varying from 0.0160 to 0.0014 a/o with three more intermediate values. The effect of decreasing nitrogen atom concentration similar to that of increased radiation exposure—reduced yield drops, an increased critical temperature for the onset of serrations, a decreased critical temperature for the disappearance of serrations, and a decreased range of temperatures of unstable plastic deformation.
The activation energy for the appearance of serrations was identified with that for the diffusion of carbon or nitrogen in steel and was not affected by either neutron irradiation or dry hydrogen treatment. Quantitative correlations of the yield stress, the critical temperature for the onset of serrations, and the density of mobile dislocations with the concentration of nitrogen atoms revealed that Cottrell locking is dominant over Snoek drag for the strain-rates used here.
interstitial, impurities, embrittlement, diffusion, energy, radiation, aging, ductility, dislocation, locking, defects, serrations
Murty, K. Linga
Professor, North Carolina State University, Raleigh, NC
Mahmood, Sheikh T.
Graduate student, North Carolina State University, Raleigh, NC