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ANS Student Conference 2025
April 3–5, 2025
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Fusion Science and Technology
Latest News
Norway’s Halden reactor takes first step toward decommissioning
The government of Norway has granted the transfer of the Halden research reactor from the Institute for Energy Technology (IFE) to the state agency Norwegian Nuclear Decommissioning (NND). The 25-MWt Halden boiling water reactor operated from 1958 to 2018 and was used in the research of nuclear fuel, reactor internals, plant procedures and monitoring, and human factors.
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.