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Title: Precipitation kinetics during aging of an alumina-forming austenitic stainless steel

The microstructural evolution of DAFA26, an alumina-forming austenitic (AFA) stainless steel, was investigated during aging. The effect of aging at 750 °C and 800 °C on the growth of spherical γ’-Ni 3(Al, Ti) particles present in the as-processed state was studied extensively using X-ray diffraction, microhardness testing, scanning electron microscopy, transmission electron microscopy, and atom probe tomography. The γ’ particles had a cube-on-cube orientation relationship with the matrix (i.e. ((010)(010) m//(010)(010) p, [100][100] m//[100][100] p)). The coarsening kinetics of γ’-Ni 3Al particles were in agreement with the Lifshitz, Slyozof-Wagner theory. Coarse Laves phase particles were also present in the as-processed state, and during the aging process both smaller Laves phase precipitates and B2-NiAl precipitates formed on both the grain boundaries and in the matrix. As a result, the γ’ precipitates were determined to have the most impact on the room temperature hardness.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [1] ;  [2]
  1. Dartmouth College, Hanover, NH (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; DEFG2612FE0008857
Type:
Accepted Manuscript
Journal Name:
Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing
Additional Journal Information:
Journal Volume: 667; Journal ID: ISSN 0921-5093
Publisher:
Elsevier
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; austenite; intermetallics; aging; coarsening; grain boundaries; precipitation
OSTI Identifier:
1252150
Alternate Identifier(s):
OSTI ID: 1360851

Trotter, Geneva, Hu, Bin, Sun, Annie Y., Harder, Reed, Miller, Michael K., Baker, Ian, and Yao, Lan. Precipitation kinetics during aging of an alumina-forming austenitic stainless steel. United States: N. p., Web. doi:10.1016/j.msea.2016.04.081.
Trotter, Geneva, Hu, Bin, Sun, Annie Y., Harder, Reed, Miller, Michael K., Baker, Ian, & Yao, Lan. Precipitation kinetics during aging of an alumina-forming austenitic stainless steel. United States. doi:10.1016/j.msea.2016.04.081.
Trotter, Geneva, Hu, Bin, Sun, Annie Y., Harder, Reed, Miller, Michael K., Baker, Ian, and Yao, Lan. 2016. "Precipitation kinetics during aging of an alumina-forming austenitic stainless steel". United States. doi:10.1016/j.msea.2016.04.081. https://www.osti.gov/servlets/purl/1252150.
@article{osti_1252150,
title = {Precipitation kinetics during aging of an alumina-forming austenitic stainless steel},
author = {Trotter, Geneva and Hu, Bin and Sun, Annie Y. and Harder, Reed and Miller, Michael K. and Baker, Ian and Yao, Lan},
abstractNote = {The microstructural evolution of DAFA26, an alumina-forming austenitic (AFA) stainless steel, was investigated during aging. The effect of aging at 750 °C and 800 °C on the growth of spherical γ’-Ni3(Al, Ti) particles present in the as-processed state was studied extensively using X-ray diffraction, microhardness testing, scanning electron microscopy, transmission electron microscopy, and atom probe tomography. The γ’ particles had a cube-on-cube orientation relationship with the matrix (i.e. ((010)(010)m//(010)(010)p, [100][100]m//[100][100]p)). The coarsening kinetics of γ’-Ni3Al particles were in agreement with the Lifshitz, Slyozof-Wagner theory. Coarse Laves phase particles were also present in the as-processed state, and during the aging process both smaller Laves phase precipitates and B2-NiAl precipitates formed on both the grain boundaries and in the matrix. As a result, the γ’ precipitates were determined to have the most impact on the room temperature hardness.},
doi = {10.1016/j.msea.2016.04.081},
journal = {Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing},
number = ,
volume = 667,
place = {United States},
year = {2016},
month = {4}
}