DOE PAGES title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Phase transformation kinetics in rolled U-10 wt. % Mo foil: Effect of post-rolling heat treatment and prior γ-UMo grain size

Abstract

Here, the effect of sub-eutectoid heat treatment on the phase transformation behavior in rolled U-10 wt.% Mo (U10Mo) foils was systematically investigated. The as-cast 5 mm thick foils were initially homogenized at 900 °C for 48 h and were hot rolled to 2 mm and later cold rolled down to 0.2 mm. Three starting microstructures were evaluated: (i) hot + cold-rolled to 0.2 mm (as-rolled condition), (ii) hot + cold-rolled to 0.2 mm + annealed at 700 °C for 1 h, and (iii) hot + cold-rolled to 0.2 mm + annealed at 1000 °C for 60 h. Annealing of as-rolled materials at 700 °C resulted in small grain size (15 ± 9 μm average grain size), while annealing at 1000 °C led to very large grains (156 ± 118 μm average grain size) in rolled U10Mo foils. Later the samples were subjected to sub-eutectoid heat-treatment temperatures of 550 °C, 500 °C, and 400 °C for different durations of time starting from 1 h up to 100 h. U10Mo rolled foils went through various degrees of decomposition when subjected to the sub-eutectoid heat-treatment step and formed a lamellar microstructure through a cellular reaction mostly along the previous γ-UMo grain boundaries. Themore » least amount of cellular reaction was observed in the large-grain microstructure at all temperatures. Conversely, a substantial amount of cellular reaction was observed in both the as-rolled and the small-grain microstructure. After 100 h of heat treatment at 500 °C, the volume fraction of the lamellar phase was found to be 4%, 22%, and 82% in large-grain, as-rolled, and small-grain samples, respectively.« less

Authors:
 [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [1]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Biological and Environmental Research (BER)
OSTI Identifier:
1395354
Alternate Identifier(s):
OSTI ID: 1549206
Report Number(s):
PNNL-SA-127108
Journal ID: ISSN 0022-3115; PII: S0022311517309170
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Nuclear Materials
Additional Journal Information:
Journal Volume: 496; Journal Issue: C; Journal ID: ISSN 0022-3115
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS

Citation Formats

Jana, Saumyadeep, Overman, Nicole, Varga, Tamas, Lavender, Curt, and Joshi, Vineet V. Phase transformation kinetics in rolled U-10 wt. % Mo foil: Effect of post-rolling heat treatment and prior γ-UMo grain size. United States: N. p., 2017. Web. doi:10.1016/J.JNUCMAT.2017.09.030.
Jana, Saumyadeep, Overman, Nicole, Varga, Tamas, Lavender, Curt, & Joshi, Vineet V. Phase transformation kinetics in rolled U-10 wt. % Mo foil: Effect of post-rolling heat treatment and prior γ-UMo grain size. United States. https://doi.org/10.1016/J.JNUCMAT.2017.09.030
Jana, Saumyadeep, Overman, Nicole, Varga, Tamas, Lavender, Curt, and Joshi, Vineet V. Mon . "Phase transformation kinetics in rolled U-10 wt. % Mo foil: Effect of post-rolling heat treatment and prior γ-UMo grain size". United States. https://doi.org/10.1016/J.JNUCMAT.2017.09.030. https://www.osti.gov/servlets/purl/1395354.
@article{osti_1395354,
title = {Phase transformation kinetics in rolled U-10 wt. % Mo foil: Effect of post-rolling heat treatment and prior γ-UMo grain size},
author = {Jana, Saumyadeep and Overman, Nicole and Varga, Tamas and Lavender, Curt and Joshi, Vineet V.},
abstractNote = {Here, the effect of sub-eutectoid heat treatment on the phase transformation behavior in rolled U-10 wt.% Mo (U10Mo) foils was systematically investigated. The as-cast 5 mm thick foils were initially homogenized at 900 °C for 48 h and were hot rolled to 2 mm and later cold rolled down to 0.2 mm. Three starting microstructures were evaluated: (i) hot + cold-rolled to 0.2 mm (as-rolled condition), (ii) hot + cold-rolled to 0.2 mm + annealed at 700 °C for 1 h, and (iii) hot + cold-rolled to 0.2 mm + annealed at 1000 °C for 60 h. Annealing of as-rolled materials at 700 °C resulted in small grain size (15 ± 9 μm average grain size), while annealing at 1000 °C led to very large grains (156 ± 118 μm average grain size) in rolled U10Mo foils. Later the samples were subjected to sub-eutectoid heat-treatment temperatures of 550 °C, 500 °C, and 400 °C for different durations of time starting from 1 h up to 100 h. U10Mo rolled foils went through various degrees of decomposition when subjected to the sub-eutectoid heat-treatment step and formed a lamellar microstructure through a cellular reaction mostly along the previous γ-UMo grain boundaries. The least amount of cellular reaction was observed in the large-grain microstructure at all temperatures. Conversely, a substantial amount of cellular reaction was observed in both the as-rolled and the small-grain microstructure. After 100 h of heat treatment at 500 °C, the volume fraction of the lamellar phase was found to be 4%, 22%, and 82% in large-grain, as-rolled, and small-grain samples, respectively.},
doi = {10.1016/J.JNUCMAT.2017.09.030},
journal = {Journal of Nuclear Materials},
number = C,
volume = 496,
place = {United States},
year = {2017},
month = {9}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record

Citation Metrics:
Cited by: 3 works
Citation information provided by
Web of Science

Save / Share:

Works referenced in this record:

Development of very-high-density low-enriched-uranium fuels
journal, December 1997


Properties of DU–10wt% Mo alloys subjected to various post-rolling heat treatments
journal, June 2010


Phase transformation of metastable cubic γ-phase in U–Mo alloys
journal, September 2010


IRRADIATION PERFORMANCE OF U-Mo MONOLITHIC FUEL
journal, April 2014

  • Meyer, M. K.; Gan, J.; Jue, J. F.
  • Nuclear Engineering and Technology, Vol. 46, Issue 2
  • DOI: 10.5516/NET.07.2014.706

Thermomechanical process optimization of U-10wt% Mo – Part 2: The effect of homogenization on the mechanical properties and microstructure
journal, October 2015


Thermomechanical process optimization of U-10 wt% Mo – Part 1: high-temperature compressive properties and microstructure
journal, October 2015


Fabrication of Monolithic RERTR Fuels by Hot Isostatic Pressing
journal, November 2010

  • Jue, Jan-Fong; Park, Blair H.; Clark, Curtis R.
  • Nuclear Technology, Vol. 172, Issue 2
  • DOI: 10.13182/NT10-A10905

Microstructural characteristics of HIP-bonded monolithic nuclear fuels with a diffusion barrier
journal, May 2014

  • Jue, Jan-Fong; Keiser, Dennis D.; Breckenridge, Cynthia R.
  • Journal of Nuclear Materials, Vol. 448, Issue 1-3
  • DOI: 10.1016/j.jnucmat.2014.02.004

The uranium-molybdenum equilibrium diagram below 900° C
journal, March 1960


Thermodynamic assessment of the U–Mo–Al system
journal, July 2010


Calphad thermodynamic description of some binary systems involving U
journal, April 2011


Phase decomposition of γ-U (bcc) in U-10 wt% Mo fuel alloy during hot isostatic pressing of monolithic fuel plate
journal, November 2016


Ageing characteristics of the metastable gamma phase in U–9 wt.% Mo alloy: experimental observations and thermodynamic validation
journal, September 2015


Neutron and hard X-ray diffraction studies of the isothermal transformation kinetics in the research reactor fuel candidate U–8 wt%Mo
journal, May 2016

  • Säubert, Steffen; Jungwirth, Rainer; Zweifel, Tobias
  • Journal of Applied Crystallography, Vol. 49, Issue 3
  • DOI: 10.1107/S1600576716005744

α-Phase transformation kinetics of U – 8 wt% Mo established by in situ neutron diffraction
journal, August 2016


Microstructural study of gamma phase stability in U–9wt.% Mo alloy
journal, March 2012


Study of decomposition and reactions with aluminum matrix of dispersed atomized U-10 wt% Mo alloy
journal, December 2002


Phase transitions during artificial ageing of segregated as-cast U–Mo alloys
journal, February 2015

  • Pedrosa, Tércio Assunção; dos Santos, Ana Maria Matildes; Lameiras, Fernando Soares
  • Journal of Nuclear Materials, Vol. 457
  • DOI: 10.1016/j.jnucmat.2014.11.004

In situ TEM and synchrotron characterization of U–10Mo thin specimen annealed at the fast reactor temperature regime
journal, December 2015


Kinetics of cellular transformation and competing precipitation mechanisms during sub-eutectoid annealing of U10Mo alloys
journal, November 2017


Kinetics of discontinuous coarsening of cellular precipitate in a Cu-15 wt% in alloy
journal, July 1986


Study of decomposition and stabilization of splat-cooled cubic γ-phase U–Mo alloys
journal, December 2013


Nomenclature proposee pour les phases des alliages d'uranium
journal, September 1960


Characterization of cubic γ-phase uranium molybdenum alloys synthesized by ultrafast cooling
journal, September 2012


Microstructural characteristics of DU–xMo alloys with x=7–12wt%
journal, June 2009

  • Burkes, Douglas E.; Hartmann, Thomas; Prabhakaran, Ramprashad
  • Journal of Alloys and Compounds, Vol. 479, Issue 1-2
  • DOI: 10.1016/j.jallcom.2008.12.063

Neutron diffraction study of U–10 wt% Mo alloy
journal, February 2000


Works referencing / citing this record:

Preparation of γ-Uranium-Molybdenum Alloys by Electrochemical Reduction of Solid Oxides in LiCl Molten Salt
journal, January 2019

  • Zhong, Yu-Ke; Liu, Kui; Liu, Ya-Lan
  • Journal of The Electrochemical Society, Vol. 166, Issue 8
  • DOI: 10.1149/2.0201908jes

Texture Evolution in U-10Mo Nuclear Fuel Foils during Plasma Spray Coating with Zr
journal, May 2018

  • Takajo, Shigehiro; Hollis, Kendall; Cummins, Dustin
  • Quantum Beam Science, Vol. 2, Issue 2
  • DOI: 10.3390/qubs2020012