Influence of processing on the microstructure and mechanical properties of 14YWT

Hoelzer, David T.; Unocic, Kinga A.; Sokolov, Mikhail A.; Byun, Thak Sang

doi:10.1016/j.jnucmat.2015.12.011

Title: Influence of processing on the microstructure and mechanical properties of 14YWT

Journal Article · Tue Dec 15 00:00:00 EST 2015 · Journal of Nuclear Materials

DOI:https://doi.org/10.1016/j.jnucmat.2015.12.011· OSTI ID:1241464

Hoelzer, David T. ^[1]; Unocic, Kinga A. ^[1]; Sokolov, Mikhail A. ^[1]; Byun, Thak Sang ^[2]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

In this study, the investigation of the mechanical alloying (MA) conditions for producing the advanced oxide dispersion strengthened (ODS) 14YWT ferritic alloy led to significant improvements in balancing the strength, ductility and fracture toughness properties while still maintaining the salient microstructural features consisting of ultra-fine grains and high concentration of Y-, Ti- and O-enriched nanoclusters. The implemented changes to the processing conditions included reducing the contamination of the powder during ball milling, applying a pre-extrusion annealing treatment on the ball milled powder and exploring different extrusion temperatures at 850 °C (SM170 heat), 1000 °C (SM185) and 1150 °C (SM200). The microstructural studies of the three 14YWT heats showed similarities in the dispersion of nanoclusters and sub-micron size grains, indicating the microstructure was insensitive to the different extrusion conditions. Compared to past 14YWT heats, the three new heats showed lower strength, but higher ductility levels between 25 and 800 °C and significantly higher fracture toughness values between 25 °C and 700 °C. The lower contamination levels of O, C and N achieved with improved ball milling conditions plus the slightly larger grain size were identified as important factors for improving the balance in mechanical properties of the three heats of 14YWT.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1241464

Alternate ID(s):: OSTI ID: 1252041

Journal Information:: Journal of Nuclear Materials, Vol. 471, Issue C; ISSN 0022-3115

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

Citation Metrics:

Cited by: 48 works

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Formation mechanisms of Y–Al–O complex oxides in 9Cr-ODS steels with Al addition Zhou, Xiaosheng; Ma, Zongqing; Yu, Liming Journal of Materials Science, Vol. 54, Issue 10 https://doi.org/10.1007/s10853-018-03293-8	journal	February 2019
Characterisation of atomic-scale defects in ODS ferritic alloys by positron annihilation Druzhkov, A. P.; Perminov, D. A. Philosophical Magazine, Vol. 99, Issue 7 https://doi.org/10.1080/14786435.2018.1563309	journal	January 2019
Microstructure Evolution in ODS Alloys with a High-Volume Fraction of Nano Oxides Svoboda, Jiří; Horník, Vít; Stratil, Luděk Metals, Vol. 8, Issue 12 https://doi.org/10.3390/met8121079	journal	December 2018
Hot Deformation Behavior and Microstructure Evolution of 14Cr ODS Steel Zhao, Qian; Yu, Liming; Ma, Zongqing Materials, Vol. 11, Issue 6 https://doi.org/10.3390/ma11061044	journal	June 2018

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