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Title: Effect of tube processing methods on microstructure, mechanical properties and irradiation response of 14YWT nanostructured ferritic alloys

Journal Article · · Acta Materialia
 [1];  [1];  [2];  [3];  [4];  [4];  [4];  [5]; ORCiD logo [6]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of New Mexico, Albuquerque, NM (United States)
  3. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  4. Texas A & M Univ., College Station, TX (United States)
  5. Ames Lab., Ames, IA (United States)
  6. Case Western Reserve Univ., Cleveland, OH (United States)

In this research, innovative thermal spray deposition (Process I) and conventional hot extrusion processing (Process II) methods have been used to produce thin walled tubing (~0.5 mm wall thickness) out of 14YWT, a nanostructured ferritic alloy. The effects of processing methods on the microstructure, mechanical properties and irradiation response have been investigated by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), micro- and nano-hardness techniques. It has been found that these two processes have a significant effect on the microstructure and mechanical properties of the as fabricated 14YWT tubes. Even though both processing methods yield the formation of various size Y-Ti-O particles, the conventional hot extrusion method results in a microstructure with homogenously distributed smaller nano-oxides (NOs, Y-Ti-O particles < 5 nm) with higher density. Therefore, Process II tubes exhibit twice the hardness of Process I tubes. It has also been found that these two tremendously different initial microstructures strongly affect irradiation response in these tubes under extremely high dose ion irradiations up to 1100 peak dpa at 450 °C. The finer, denser and homogenously distributed NOs in the Process II tube result in a reduction in swelling by two orders of magnitude. On the other hand, inhomogeneity of the initial microstructure in the Process I tube leads to large variations in swelling and irradiation induced hardening. Moreover, hardening mechanisms before and after irradiation were measured and compared with detailed calculations. This study clearly indicates the crucial effect of initial microstructure on radiation response of 14YWT alloys.

Research Organization:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Ames Lab., Ames, IA (United States); Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Organization:
USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5); USDOE Office of Nuclear Energy (NE)
Grant/Contract Number:
AC52-06NA25396; NE0008297; AC02-07CH11358; AC07-05ID14517
OSTI ID:
1407908
Alternate ID(s):
OSTI ID: 1379172; OSTI ID: 1469386; OSTI ID: 1550280
Report Number(s):
LA-UR-17-29321; IS-J-9434; INL/JOU-17-42191-Rev000
Journal Information:
Acta Materialia, Vol. 134, Issue C; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 42 works
Citation information provided by
Web of Science

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Cited By (5)

Effect of High-Density Nanoparticles on Recrystallization and Texture Evolution in Ferritic Alloys journal March 2019
Study of the use of ionizing radiation to improve the efficiency of performance of nickel nanostructures as anodes of lithium-ion batteries journal February 2019
Shear Punch Testing of Neutron-Irradiated HT-9 and 14YWT journal January 2020
α′ formation kinetics and radiation induced segregation in neutron irradiated 14YWT nanostructured ferritic alloys journal June 2019
Study of the effect of irradiation with Ca 5+ ions on the increase in Ni nanotubes lifetime, applicable as the basis for lithium-ion batteries journal May 2019