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Members are devoted to applying nuclear science and engineering technologies involving isotopes, radiation applications, and associated equipment in scientific research, development, and industrial processes. Their interests lie primarily in education, industrial uses, biology, medicine, and health physics. Division committees include Analytical Applications of Isotopes and Radiation, Biology and Medicine, Radiation Applications, Radiation Sources and Detection, and Thermal Power Sources.
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Fusion Science and Technology
Latest News
First astatine-labeled compound shipped in the U.S.
The Department of Energy’s National Isotope Development Center (NIDC) on March 31 announced the successful long-distance shipment in the United States of a biologically active compound labeled with the medical radioisotope astatine-211 (At-211). Because previous shipments have included only the “bare” isotope, the NIDC has described the development as “unleashing medical innovation.”
Vamsi Krishna K, Gopi Krishna C, Nagendra Polamarasetty, Mahesh Kumar Talari, Vijay N. Nadakuduru, Kishore Babu Nagumothu
Fusion Science and Technology | Volume 80 | Number 1 | January 2024 | Pages 82-97
Research Article | doi.org/10.1080/15361055.2023.2200523
Articles are hosted by Taylor and Francis Online.
In the present study, the microstructural and mechanical properties of Ti-15V-3Cr-3Al-3Sn (Ti-1533) and Ti-6Al-4V (Ti-64) electron beam welds have been studied. Optical microscopy investigations revealed the presence of three different zones, namely, the fusion zone (FZ), the heat-affected zone (HAZ), and the base metal (BM). In Ti-1533 weld, the BM comprises equiaxed β grains while the FZ consists of large columnar β grains. Further, the HAZ constitutes coarse equiaxed β grains near the FZ. However, in the case of Ti-64 weld, the BM comprises a slightly elongated α phase and transformed β phase while the FZ consists of an acicular martensitic phase. Welds prepared with Ti-1533 exhibit a lower ultimate tensile strength (UTS) of 726 ± 5 MPa, yield strength (YS) of 702 ± 5 MPa, and % elongation (%El) of 12 compared to its BM (YS: 738 ± 5 MPa; UTS: 778 ± 5 MPa; %El: 15). The lower strength in Ti-1533 weld is due to the presence of coarse columnar β grains in the FZ while Ti-64 weld exhibits superior tensile properties (UTS: 993 ± 5 MPa; YS: 959 ± 4 MPa; %El: 9) compared to its BM (UTS: 910 ± 5 MPa; YS: 856 ± 5 MPa; %El: 14). The higher strength for Ti-64 weld could be attributed to the formation of acicular martensitic α′ in the FZ. However, Ti-64 welds subjected to postweld heat treatment (PWHT) showed a decrease in strength (UTS: 922 ± 4 MPa; YS: 858 ± 4; %El: 12) compared to as-welded Ti-64 welds. This is attributed to the formation of the diffusional product α+β phase in the FZ. In contrast, Ti-1533 welds subjected to PWHT showed a rapid increase in tensile property (UTS: 1224 ± 6MPa; YS: 1205 ± 8; %El: 9) values and hardness (380 HV) values compared to as-welded Ti-1533 welds. This increase in strength after PWHT is due to uniform precipitation of alpha particles in the β matrix, which was evidenced by transmission electron microscope results.