Quantitative Morphological Characterization of Carbide Inclusions in Uranium Metal

Athon, Matthew T.; Reilly, Dallas D.; Schwerdt, Ian J.; Corbey, Jordan F.; Olszta, Matthew J.; Sweet, Lucas E.

doi:10.1016/j.jnucmat.2021.153370

Quantitative Morphological Characterization of Carbide Inclusions in Uranium Metal

Journal Article · 03 January 2022 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2021.153370· OSTI ID:1829271

Athon, Matthew T. ^[1]; Reilly, Dallas D. ^[1]; Schwerdt, Ian J. ^[1]; ^[1]; ^[1]; ^[1]

BATTELLE (PACIFIC NW LAB)

Uranium carbides (UCs) are prevalent inclusions in U metal that form during melting operations from interactions with crucible walls and the casting chamber atmosphere. Although UCs have been studied extensively since the beginning of U metal foundry operations, there are still unknowns regarding the effects of thermomechanical processing on their sizes and morphology. Here, we present the results of a series of controlled cooling experiments with molten uranium to elucidate the effect of cooling rate on inclusion morphology in a-U. Samples were melted using a vacuum induction melter and manually cooled at rates of 2.5, 1.7, 1.1, 0.8, 0.3 (± 1%) K/s from ~1600 K to <700 K in under 1 hour. Subsequent scanning electron microscopy (SEM) was performed on cross-sections of the samples, revealing a complex mixture of UC morphologies that are indicative of diffusion and growth influenced by the thermal processing of the U matrix. Image analysis using the Morphological Analysis of Materials (MAMA) software showed that UC sizes generally grew larger with slower cooling rates, and the two slowest cooling rates noticeably impacted the inclusion circularity and ellipse aspect ratio. These results indicate that UC morphology is sensitive to short cooling rates (<1 hour) and could therefore be controlled in the production of metallic nuclear fuels. Additionally, inclusion speciation and morphologies could potentially provide forensic clues about processing history of unknown metal samples. Understanding the driving forces involved in UC morphology evolution is beneficial for evaluating metal fuels for next generation nuclear reactors and for identifying signatures for nuclear forensics.

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-76RL01830

OSTI ID:: 1829271

Report Number(s):: PNNL-SA-164724

Journal Information:: Journal of Nuclear Materials, Journal Name: Journal of Nuclear Materials Vol. 558

Country of Publication:: United States

Language:: English

References (20)

Quantifying Morphological Features of α-U ₃ O ₈ with Image Analysis for Nuclear Forensics Olsen, Adam M.; Richards, Bryony; Schwerdt, Ian Analytical Chemistry, Vol. 89, Issue 5 https://doi.org/10.1021/acs.analchem.6b05020	journal	February 2017
Nuclear proliferomics: A new field of study to identify signatures of nuclear materials as demonstrated on alpha-UO3 Schwerdt, Ian J.; Brenkmann, Alexandria; Martinson, Sean Talanta, Vol. 186 https://doi.org/10.1016/j.talanta.2018.04.092	journal	August 2018
Uranium Oxide Synthetic Pathway Discernment through Unsupervised Morphological Analysis Girard, M.; Hagen, A.; Schwerdt, I. Journal of Nuclear Materials, Vol. 552 https://doi.org/10.1016/j.jnucmat.2021.152983	journal	August 2021
Effect of second phase particles and stringers on microstructures after rolling and recrystallization Cheng, Guang; Hu, Xiaohua; Frazier, William E. Materials Science and Engineering: A, Vol. 736 https://doi.org/10.1016/j.msea.2018.08.040	journal	October 2018
Nuclear forensics investigation of morphological signatures in the thermal decomposition of uranyl peroxide Schwerdt, Ian J.; Olsen, Adam; Lusk, Robert Talanta, Vol. 176 https://doi.org/10.1016/j.talanta.2017.08.020	journal	January 2018
Effect of Cold Rolling on Morphology of Carbides and Properties of 7Cr17MoV Stainless Steel Yao, Di; Li, Jing; Li, Jihui Materials and Manufacturing Processes, Vol. 30, Issue 1 https://doi.org/10.1080/10426914.2014.952030	journal	November 2014
Determining uranium ore concentrates and their calcination products via image classification of multiple magnifications Ly, Cuong; Vachet, Clement; Schwerdt, Ian Journal of Nuclear Materials, Vol. 533 https://doi.org/10.1016/j.jnucmat.2020.152082	journal	May 2020
The effect of thermomechanical processing on second phase particle redistribution in U-10 wt%Mo Hu, Xiaohua; Wang, Xiaowo; Joshi, Vineet V. Journal of Nuclear Materials, Vol. 500 https://doi.org/10.1016/j.jnucmat.2017.12.042	journal	March 2018
Thermomechanical process optimization of U-10wt% Mo – Part 2: The effect of homogenization on the mechanical properties and microstructure Joshi, Vineet V.; Nyberg, Eric A.; Lavender, Curt A. Journal of Nuclear Materials, Vol. 465 https://doi.org/10.1016/j.jnucmat.2015.07.005	journal	October 2015
The Crystalline Structure of Uranium Jacob, C. W.; Warren, B. E. Journal of the American Chemical Society, Vol. 59, Issue 12 https://doi.org/10.1021/ja01291a035	journal	December 1937
Thermal Conductivity of Uranium Nitride and Carbide Szpunar, B.; Szpunar, J. A. International Journal of Nuclear Energy, Vol. 2014 https://doi.org/10.1155/2014/178360	journal	September 2014
Effect of carbon content on carbide morphology and mechanical properties of A.R. white cast iron with 10–12% tungsten Heydari, D.; Skandani, A. Alipour; Al Haik, M. Materials Science and Engineering: A, Vol. 542 https://doi.org/10.1016/j.msea.2012.02.040	journal	April 2012
Pattern recognition with machine learning on optical microscopy images of typical metallurgical microstructures Bulgarevich, Dmitry S.; Tsukamoto, Susumu; Kasuya, Tadashi Scientific Reports, Vol. 8, Issue 1 https://doi.org/10.1038/s41598-018-20438-6	journal	February 2018
The carbides of uranium Frost, B. R. T. Journal of Nuclear Materials, Vol. 10, Issue 4 https://doi.org/10.1016/0022-3115(63)90181-8	journal	December 1963
A US perspective on fast reactor fuel fabrication technology and experience part I: metal fuels and assembly design Burkes, Douglas E.; Fielding, Randall S.; Porter, Douglas L. Journal of Nuclear Materials, Vol. 389, Issue 3 https://doi.org/10.1016/j.jnucmat.2009.02.035	journal	June 2009
The effect of strain rate on the tensile flow and fracture of α-uranium Huddart, J.; Harding, J.; Bleasdale, P. A. Journal of Nuclear Materials, Vol. 89, Issue 2-3 https://doi.org/10.1016/0022-3115(80)90063-X	journal	April 1980
The effect of inclusions on the fracture of uranium Davies, D. M.; Martin, J. W. Journal of Nuclear Materials, Vol. 3, Issue 2 https://doi.org/10.1016/0022-3115(61)90003-4	journal	February 1961
Use of Tribocor 532N for a carbon-free induction furnace for vacuum-induction melting and casting of uranium and its alloys Holcombe, C. E.; Reiner, R. H.; Dykes, N. L. Journal of Materials Science Letters, Vol. 6, Issue 11 https://doi.org/10.1007/BF01794617	journal	November 1987
First-principles study of uranium carbide: Accommodation of point defects and of helium, xenon, and oxygen impurities Freyss, Michel Physical Review B, Vol. 81, Issue 1 https://doi.org/10.1103/PhysRevB.81.014101	journal	January 2010
Growth of Alloy Carbide Particles in Austenite Wey, Myeong Yong; Sakuma, Taketo; Nishizawa, Taiji Transactions of the Japan Institute of Metals, Vol. 22, Issue 10 https://doi.org/10.2320/matertrans1960.22.733	journal	January 1981

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