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Title: Tensile deformation and fracture properties of a 14YWT nanostructured ferritic alloy

Abstract

Here, a new larger heat of a 14YWT nanostructured ferritic alloy (NFA), FCRD NFA-1, was synthesized by ball milling FeO and argon atomized Fe-14Cr-3W-0.4Ti-0.2Y (wt%) powders, followed by hot extrusion, annealing and cross rolling to produce an ≈10 mm-thick plate. NFA-1 contains a bimodal size distribution of pancake-shaped, mostly very fine scale, grains. The as-processed plate also contains a large population of microcracks running parallel to its broad surfaces. The small grains and large concentration of Y–Ti–O nano-oxides (NOs) result in high strength up to 800 °C. The uniform and total elongations range from ≈1–8%, and ≈10–24%, respectively. The strength decreases more rapidly above ≈400 °C and deformation transitions to largely viscoplastic creep by ≈600 °C. While the local fracture mechanism is generally ductile-dimple microvoid nucleation, growth and coalescence, perhaps the most notable feature of tensile deformation behavior of NFA-1 is the occurrence of periodic delamination, manifested as fissures on the fracture surfaces.

Authors:
 [1];  [1];  [1];  [2];  [3];  [1]
  1. Univ. of California, Santa Barbara, CA (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1330546
Alternate Identifier(s):
OSTI ID: 1399033
Grant/Contract Number:  
AC05-00OR22725; FG03-94ER54275
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 675; Journal Issue: C; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; nanostructured ferritic alloy; nano oxide; delamination; tensile properties; fractography

Citation Formats

Alam, M. Ershadul, Pal, Soupitak, Fields, Kirk, Maloy, S. A., Hoelzer, David T., and Odette, George R.. Tensile deformation and fracture properties of a 14YWT nanostructured ferritic alloy. United States: N. p., 2016. Web. doi:10.1016/j.msea.2016.08.051.
Alam, M. Ershadul, Pal, Soupitak, Fields, Kirk, Maloy, S. A., Hoelzer, David T., & Odette, George R.. Tensile deformation and fracture properties of a 14YWT nanostructured ferritic alloy. United States. doi:10.1016/j.msea.2016.08.051.
Alam, M. Ershadul, Pal, Soupitak, Fields, Kirk, Maloy, S. A., Hoelzer, David T., and Odette, George R.. Sat . "Tensile deformation and fracture properties of a 14YWT nanostructured ferritic alloy". United States. doi:10.1016/j.msea.2016.08.051. https://www.osti.gov/servlets/purl/1330546.
@article{osti_1330546,
title = {Tensile deformation and fracture properties of a 14YWT nanostructured ferritic alloy},
author = {Alam, M. Ershadul and Pal, Soupitak and Fields, Kirk and Maloy, S. A. and Hoelzer, David T. and Odette, George R.},
abstractNote = {Here, a new larger heat of a 14YWT nanostructured ferritic alloy (NFA), FCRD NFA-1, was synthesized by ball milling FeO and argon atomized Fe-14Cr-3W-0.4Ti-0.2Y (wt%) powders, followed by hot extrusion, annealing and cross rolling to produce an ≈10 mm-thick plate. NFA-1 contains a bimodal size distribution of pancake-shaped, mostly very fine scale, grains. The as-processed plate also contains a large population of microcracks running parallel to its broad surfaces. The small grains and large concentration of Y–Ti–O nano-oxides (NOs) result in high strength up to 800 °C. The uniform and total elongations range from ≈1–8%, and ≈10–24%, respectively. The strength decreases more rapidly above ≈400 °C and deformation transitions to largely viscoplastic creep by ≈600 °C. While the local fracture mechanism is generally ductile-dimple microvoid nucleation, growth and coalescence, perhaps the most notable feature of tensile deformation behavior of NFA-1 is the occurrence of periodic delamination, manifested as fissures on the fracture surfaces.},
doi = {10.1016/j.msea.2016.08.051},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = C,
volume = 675,
place = {United States},
year = {Sat Aug 13 00:00:00 EDT 2016},
month = {Sat Aug 13 00:00:00 EDT 2016}
}

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