Characterization of Tubing from Advanced ODS alloy (FCRD-NFA1)

Technical Report · Tue Sep 20 00:00:00 EDT 2016

DOI:https://doi.org/10.2172/1325659· OSTI ID:1325659

Maloy, Stuart Andrew ^[1]; Aydogan, Eda ^[1]; Anderoglu, Osman ^[1]; Lavender, Curt ^[2]; Anderson, Iver ^[3]; Rieken, Joel ^[3]; Lewandowski, John ^[4]; Hoelzer, Dave ^[5]; Odette, George R. ^[6]

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1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
2. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
3. Ames Lab., Ames, IA (United States)
4. Case Western Reserve Univ., Cleveland, OH (United States)
5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
6. Univ. of California, Santa Barbara, CA (United States)

Fabrication methods are being developed and tested for producing fuel clad tubing of the advanced ODS 14YWT and FCRD-NFA1 ferritic alloys. Three fabrication methods were based on plastically deforming a machined thick-wall tube sample of the ODS alloys by pilgering, hydrostatic extrusion or drawing to decrease the outer diameter and wall thickness and increase the length of the final tube. The fourth fabrication method consisted of the additive manufacturing approach involving solid-state spray deposition (SSSD) of ball milled and annealed powder of 14YWT for producing thin-wall tubes. Of the four fabrication methods, two methods were successful at producing tubing for further characterization: production of tubing by high-velocity oxy-fuel spray forming and production of tubing using high-temperature hydrostatic extrusion. The characterization described shows through neutron diffraction the texture produced during extrusion while maintaining the beneficial oxide dispersion. In this research, the parameters for innovative thermal spray deposition and hot extrusion processing methods have been developed to produce the final nanostructured ferritic alloy (NFA) tubes having approximately 0.5 mm wall thickness. Effect of different processing routes on texture and grain boundary characteristics has been investigated. It was found that hydrostatic extrusion results in combination of plane strain and shear deformations which generate rolling textures of α- and γ-fibers on {001}<110> and {111}<110> together with a shear texture of ζ-fiber on {011}<211> and {011}<011>. On the other hand, multi-step plane strain deformation in cross directions leads to a strong rolling textures of θ- and ε-fiber on {001}<110> together with weak γ-fiber on {111}<112>. Even though the amount of the equivalent strain is similar, shear deformation leads to much lower texture indexes compared to the plane strain deformations. Moreover, while 50% of hot rolling brings about a large number of high-angle grain boundaries (HAB), 44% of shear deformation results in large amount of low-angle boundaries (LAB) showing the incomplete recrystallization.

• Research Organization: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States); Ames Laboratory (AMES), Ames, IA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5). Advanced Fuels Campaign
• Contributing Organization: Univ. of California, Santa Barbara, CA (United States); Case Western Reserve Univ., Cleveland, OH (United States)
• DOE Contract Number: AC52-06NA25396
• OSTI ID: 1325659
• Report Number(s): LA-UR-15-27372; TRN: US1700001
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
22 GENERAL STUDIES OF NUCLEAR REACTORS
FERRITIC STEELS
CHROMIUM STEELS
EXTRUSION
ROLLING
DRAWING
GRAIN BOUNDARIES
TUBES
OXIDES
TEXTURE
NEUTRON DIFFRACTION
FIBERS
SHEAR
DEFORMATION
STRAINS
TEMPERATURE RANGE 1000-4000 K
SPRAYS
COMPARATIVE EVALUATIONS
DEPOSITION
FUEL CANS
MANUFACTURING
NANOSTRUCTURES
RECRYSTALLIZATION