Abstract Scope |
Irradiation induced microstructure and irradiation-assisted stress corrosion cracking (IASCC) of additively manufactured (AM) 316L stainless steel were evaluated for application as a core structural material. Both stress-relieving (SR) and hot-isotropic pressing (HIP) were performed on AM 316L SS for comparison with the wrought condition. The HIP AM 316L showed better radiation tolerance than SR AM 316L after a 2.5 dpa proton irradiation at 360℃, with fewer dislocation loops and cavities. Irradiation to 30 dpa with 5 MeV Fe2+ ions at 500 - 600 ℃ revealed less void swelling in HIP AM 316L than in SR AM 316L. SR AM 316L had a higher cracking susceptibility when loaded perpendicular to the build direction, though large interlayer cracks were observed in the parallel direction loading, and fewest cracks were found in the HIP AM 316L SS. The post-printed HIP condition eliminated anisotropic behavior, enhanced radiation tolerance, and exhibited greatest IASCC resistance. |