DISLOCATION-SUBSTRUCTURE INTERACTIONS IN IRRADIATED IRON AND STEEL.

v i i 14. Increase in Athermal Hardening (shear stress, r = 1/20) as Function of Fast Fluence Observed in McRickardls Experiments and in Smidtls Experiments.15.Tensile Test Results of Hinkle and Smith Showing Lack of Hardening in Iron After Irradiation at -130 OC and Increase in Hardening After 10 min Anneals Above 50 OC as Compared with Samples Irradiated at 90 OC.16.Relative Irradiation Hardening in Arbitrary Units for Several Steels Irradiated to Fission Fluence of 2.5 x 1017 n/cm2 at Irradiation Temperatures from 50 OC to 300 OC. 17. Recovery of DPH Hardness in Cold-Worked and Irradiated Iron Samples of Two Purities.18. Orowan Mechanism of Precipitation Hardening and Sample Calculation of Hardening for Typical Values of Defect Density and Size in Iron Irradiated to Fast Fluence of About 9 x 1019 n/cm2.19. A. Transmission Electron Micrograph of Dislocation Substructure in Unirradiated Iron Foil Deformed 5% with Typical Cell Wall Formation.B. Transmission Electron Micrograph of Dislocation Substructure in Iron Irradiated to Fast Fluence of 8 x 1019 n/cm2 (E > 1 MeV) and Deformed 5%.20.Influence of Neutron Irradiation on Ductile to Brittle Transition Temperature as Measured by Reduction in Area.How Increase in Athermal Hardening Shifts Ductile to Brittle Transition Temperature to Higher Temperatures.22.Effect of Irradiation Temperature on Yield Stress and Reduction in Area in Ferrovac E Iron.