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Microstructural Alteration of Structural Alloys by Low Temperature Irradiation with High Energy Protons and Spallation Neutrons

WF. SommerGM. BondFA. GarnerMr. JamesSA. MaloyBH. Sencer

出版	ASTM International, 2001
URL	http://books.google.com.hk/books?id=yRF6zgEACAAJ&hl=&source=gbs_api

註釋

Several candidate alloys (nickel-based Alloy 718, iron-based 316 L and 304 L stainless steels) have been exposed to mixed proton-neutron particle fluxes and spectra at the Los Alamos Neutron Science Center (LANSCE), with the radiation conditions similar to those expected in the proposed Accelerator Production of Tritium (APT) facility. All alloys developed a high density of small black-spot damage and larger Frank loops, even at the lowest dose examined, producing rapid hardening and concurrent loss of ductility. The radiation-induced evolution of both microstructure and mechanical properties in the 300-series stainless steels is relatively simple, whereas that in Alloy 718 is rather more complex,. Superlattice spots corresponding to the age-hardening precipitate phases ? ′ and ? ′′ are lost from the diffraction patterns for Alloy 718 by only 0.6 dpa, the lowest proton/neutron-induced dose level achieved in this experiment. Examination of neutron-irradiated samples to doses of only ~0.1 dpa showed that precipitates are faintly visible in diffraction patterns but are rapidly becoming invisible. It is proposed that the ? ′ and ? ′′ first become disordered (by