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

Trotter, Geneva; Hu, Bin; Sun, Annie Y.; Harder, Reed; Miller, Michael K.; Baker, Ian; Yao, Lan

doi:10.1016/j.msea.2016.04.081

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

Journal Article · Thu Apr 28 00:00:00 EDT 2016 · Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing

DOI:https://doi.org/10.1016/j.msea.2016.04.081· OSTI ID:1252150

Trotter, Geneva ^[1]; Hu, Bin ^[1]; Sun, Annie Y. ^[1]; Harder, Reed ^[1]; Miller, Michael K. ^[2]; Baker, Ian ^[1]; Yao, Lan ^[2]

Dartmouth College, Hanover, NH (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

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.

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

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725; DEFG2612FE0008857

OSTI ID:: 1252150

Alternate ID(s):: OSTI ID: 1360851

Journal Information:: Materials Science and Engineering. A, Structural Materials: Properties, Microstructure and Processing, Vol. 667; ISSN 0921-5093

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 26 works

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Precipitates and Particles Coarsening of 9Cr–1.7W–0.4Mo–Co Ferritic Heat-Resistant Steel after Isothermal Aging Gao, Qiuzhi; Zhang, Yanan; Zhang, Hailian Scientific Reports, Vol. 7, Issue 1 https://doi.org/10.1038/s41598-017-06191-2	journal	July 2017

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36 MATERIALS SCIENCE
austenite
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aging
coarsening
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