Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Solid-State Welding of the Nanostructured Ferritic Alloy 14YWT Using a Capacitive Discharge Resistance Welding Technique

Journal Article · · Metals
DOI:https://doi.org/10.3390/met12010023· OSTI ID:1853935

Joining nanostructured ferritic alloys (NFAs) has proved challenging, as the nano-oxides that provide superior strength, creep resistance, and radiation tolerance at high temperatures tend to agglomerate, redistribute, and coarsen during conventional fusion welding. In this study, capacitive discharge resistance welding (CDRW)—a solid-state variant of resistance welding—was used to join end caps and thin-walled cladding tubes of the NFA 14YWT. The resulting solid-state joints were found to be hermetically sealed and were characterized across the weld region using electron microscopy (macroscopic, microscopic, and nanometer scales) and nanoindentation. Microstructural evolution near the weld line was limited to narrow (~50–200 μm) thermo-mechanically affected zones (TMAZs) and to a reduction in pre-existing component textures. Dispersoid populations (i.e., nano-oxides and larger oxide particles) appeared unchanged by all but the highest energy and power CDRW condition, with this extreme producing only minor nano-oxide coarsening (~2 nm → ~5 nm Ø). Despite a minimal microstructural change, the TMAZs were found to be ~10% softer than the surrounding base material. These findings are considered in terms of past solid-state welding (SSW) efforts—cladding applications and NFA-like materials in particular—and in terms of strengthening mechanisms in NFAs and the potential impacts of localized temperature–strain conditions during SSW.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
89233218CNA000001
OSTI ID:
1853935
Report Number(s):
LA-UR-22-20457
Journal Information:
Metals, Journal Name: Metals Journal Issue: 1 Vol. 12; ISSN 2075-4701
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

References (62)

Laser welding of oxide dispersion-strengthened alloy MA754 journal January 1992
Microstructural features of friction welded MA 956 superalloy material journal December 1996
Preparation and properties of some ODS Fe-Cr-Al alloys journal February 1978
Joining ODS materials for high-temperature applications journal July 1994
Investigation of the Y2O3 distribution in the weld joints of dispersion-hardened steel cladding of fast-reactor fuel elements journal June 2007
Joining of Nanostructured Ferritic 14YWT Alloys by Spark Plasma Technique journal April 2021
Irradiation-tolerant nanostructured ferritic alloys: Transforming helium from a liability to an asset journal September 2010
Recent Progress in Developing and Qualifying Nanostructured Ferritic Alloys for Advanced Fission and Fusion Applications journal November 2014
Laser and Pressure Resistance Weld of Thin-Wall Cladding for LWR Accident-Tolerant Fuels journal December 2017
Shear Punch Testing of Neutron-Irradiated HT-9 and 14YWT journal January 2020
Texture development during the torsion testing of α-iron and two IF steels journal November 1996
The Effects of Helium in Irradiated Structural Alloys book January 2012
Oxide Dispersion Strengthened Steels book January 2012
Perspective of ODS alloys application in nuclear environments journal December 2002
Mechanically alloyed, ferritic oxide dispersion strengthened alloys: structure and properties journal February 1997
Creep response and deformation processes in nanocluster-strengthened ferritic steels journal April 2008
Materials challenges in nuclear energy journal February 2013
The crystal structure, orientation relationships and interfaces of the nanoscale oxides in nanostructured ferritic alloys journal June 2016
Temperature dependent dispersoid stability in ion-irradiated ferritic-martensitic dual-phase oxide-dispersion-strengthened alloy: Coherent interfaces vs. incoherent interfaces journal September 2016
Effect of tube processing methods on microstructure, mechanical properties and irradiation response of 14YWT nanostructured ferritic alloys journal August 2017
Characterization of polyhedral nano-oxides and helium bubbles in an annealed nanostructured ferritic alloy journal January 2020
Stability of ferritic MA/ODS alloys at high temperatures journal March 2005
Microstructural evolution in friction stir welding of nanostructured ODS alloys journal August 2010
Pressurized resistance welding technology development in 9Cr-ODS martensitic steels journal August 2004
Stability of nanometer-sized oxide clusters in mechanically-alloyed steel under ion-induced displacement cascade damage conditions journal February 2007
Influence of particle dispersions on the high-temperature strength of ferritic alloys journal August 2007
The microstructure and strength properties of MA957 nanostructured ferritic alloy joints produced by friction stir and electro-spark deposition welding journal August 2007
Thermal stability of nano-structured ferritic alloy journal June 2008
Helium effects on microstructural evolution in tempered martensitic steels: In situ helium implanter studies in HFIR journal April 2009
Some microstructural characterisations in a friction stir welded oxide dispersion strengthened ferritic steel alloy journal April 2009
Helium transport, fate and management in nanostructured ferritic alloys: In situ helium implanter studies journal October 2011
Assessment of a new fabrication route for Fe–9Cr–1W ODS cladding tubes journal September 2012
Study of the thermal stability of nanoparticle distributions in an oxide dispersion strengthened (ODS) ferritic alloys journal September 2012
Microstructure and mechanical properties of friction stir welded oxide dispersion strengthened alloy journal January 2013
Radiation stability of nanoclusters in nano-structured oxide dispersion strengthened (ODS) steels journal March 2013
Joining of 14YWT and F82H by friction stir welding journal November 2013
Nano-cluster stability following neutron irradiation in MA957 oxide dispersion strengthened material journal January 2014
Stability of nanoclusters in 14YWT oxide dispersion strengthened steel under heavy ion-irradiation by atom probe tomography journal December 2014
Response of 9Cr-ODS steel to proton irradiation at 400°C journal September 2014
Ion-induced swelling of ODS ferritic alloy MA957 tubing to 500 dpa journal October 2014
Microstructural changes and void swelling of a 12Cr ODS ferritic-martensitic alloy after high-dpa self-ion irradiation journal December 2015
Effect of friction stir welding and post-weld heat treatment on a nanostructured ferritic alloy journal February 2016
Influence of processing on the microstructure and mechanical properties of 14YWT journal April 2016
Stability of nanosized oxides in ferrite under extremely high dose self ion irradiations journal April 2017
Pressure resistance welding of MA-957 to HT-9 for advanced reactor applications journal September 2018
Dual ion irradiation of commercial and advanced alloys: Evaluating microstructural resistance for high dose core internals journal April 2019
Ferritic and martensitic ODS steel resistance upset welding of fuel claddings: Weldability assessment and metallurgical effects journal May 2019
Modern nanostructured ferritic alloys: A compelling and viable choice for sodium fast reactor fuel cladding applications journal February 2020
Microstructural and micro-mechanical analysis of 14YWT nanostructured Ferritic alloy after varying thermo-mechanical processing paths into tubing journal January 2021
Effect of friction pressure on the properties of friction welded MA956 iron-based superalloy journal January 2007
On the status and prospects for nanostructured ferritic alloys for nuclear fission and fusion application with emphasis on the underlying science journal January 2018
Structural materials for fission & fusion energy journal November 2009
TEM Characterization of Tensile-Tested 14YWT Nanostructured Ferritic Alloys journal August 2008
Mechanical Alloying journal May 1976
Recent Developments in Irradiation-Resistant Steels journal August 2008
Mechanical Alloying journal August 1983
Stability of Y–Ti–O precipitates in friction stir welded nanostructured ferritic alloys journal January 2015
Effects of friction stir welding and post-weld annealing on nanostructured ferritic alloy journal April 2011
Developments in The Production of Oxide Dispersion Strengthened Superalloys journal January 1984
ODS Steel Clad MOX Fuel-Pin Fabrication and Irradiation Performance in EBR-II journal June 2002
Measurement of hardness and elastic modulus by instrumented indentation: Advances in understanding and refinements to methodology journal January 2004
Resistance Upset Welding of ODS Steel Fuel Claddings—Evaluation of a Process Parameter Range Based on Metallurgical Observations journal August 2017

Similar Records

Joining of 14YWT and F82H by Friction Stir Welding
Conference · Mon Dec 31 23:00:00 EST 2012 · OSTI ID:1104787

Characterization of 14YWT & ODS Base Metals
Technical Report · Fri Apr 05 00:00:00 EDT 2019 · OSTI ID:1507315

Effect of friction stir welding and post-weld heat treatment on a nanostructured ferritic alloy
Journal Article · Mon Dec 07 23:00:00 EST 2015 · Journal of Nuclear Materials · OSTI ID:1286916