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Division Spotlight
Fuel Cycle & Waste Management
Devoted to all aspects of the nuclear fuel cycle including waste management, worldwide. Division specific areas of interest and involvement include uranium conversion and enrichment; fuel fabrication, management (in-core and ex-core) and recycle; transportation; safeguards; high-level, low-level and mixed waste management and disposal; public policy and program management; decontamination and decommissioning environmental restoration; and excess weapons materials disposition.
Meeting Spotlight
Utility Working Conference and Vendor Technology Expo (UWC 2024)
August 4–7, 2024
Marco Island, FL|JW Marriott Marco Island
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Jul 2024
Jan 2024
Latest Journal Issues
Nuclear Science and Engineering
August 2024
Nuclear Technology
Fusion Science and Technology
Latest News
ARPA-E announces $40 million to develop transmutation technologies for UNF
The Department of Energy’s Advanced Research Projects Agency–Energy (ARPA-E) announced $40 million in funding to develop cutting-edge technologies to enable the transmutation of used nuclear fuel into less-radioactive substances. According to ARPA-E, the new initiative addresses one of the agency’s core goals as outlined by Congress: to provide transformative solutions to improve the management, cleanup, and disposal of radioactive waste and spent nuclear fuel.
K. Vamsi Krishna, Sriharitha Rowthu, Vijay N. Nadakuduru, Ganesh Pilla, N. Kishore Babu
Fusion Science and Technology | Volume 80 | Number 1 | January 2024 | Pages 68-81
Research Article | doi.org/10.1080/15361055.2023.2182119
Articles are hosted by Taylor and Francis Online.
Titanium alloys are extensively used in aerospace applications due to their high strength-to-weight ratio, corrosion resistance, and outstanding mechanical performance. However, welding these alloys is difficult as they are highly reactive to environmental gases (O, N, and H) above 500°C. Aerospace structures require joints of high integrity to meet the design requirements. To this concern, gas tungsten arc welding (GTAW) offers the potential to achieve welds of equal quality to electron beam welding or laser beam welding at much lower capital costs. The present study reports the influence of heat input on the evolution of microstructure and mechanical properties of Ti-15V-3Al-3Cr-3Sn (Ti-1533), a metastable beta titanium alloy welded by GTAW. The heat input can be controlled by different welding parameters like current, voltage, and welding speed. However, welding speed (15, 20, and 25 cm/min) is a crucial welding parameter that influences the cooling rate (product of thermal gradient and growth rate) and heat input. The microstructure of the fusion zone (FZ) consists of coarse columnar β grains, and coarse equiaxed β grains in the heat-affected zone, while the base metal comprises fine equiaxed β grains in all welding speeds. The average width of the FZ was found to decrease with an increase in welding speed due to lower heat input and higher cooling rate. The welds at 25 cm/min welding speed showed higher ultimate tensile strength (UTS) (654 ± 5 MPa) and hardness (240 HV) compared to 15 cm/min welding speed (UTS 593 ± 5 MPa; hardness 230 HV). The higher strength in the as-welded sample at 25 cm/min welding speed can be attributed to the lower columnar width of the β grains and the formation of equiaxed grains at the bottom portion of the weld zone. A similar trend was observed in samples subjected to the postweld heat treatment for all the weld speeds. Postweld aging of the welds prepared at 25 cm/min speed showed uniform α precipitates in the β matrix, as evidenced by transmission electron microscope results.