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In Situ Neutron-Diffraction Studies on the Creep Behavior of a Ferritic Superalloy

  • Symposium: Neutron and X-Ray Studies of Advanced Materials IV
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Abstract

Precipitate strengthening effects toward the improved creep behavior have been investigated in a ferritic superalloy with B2-type (Ni,Fe)Al precipitates. In situ neutron diffraction has been employed to study the evolution of the average phase strains, (hkl) plane-specific lattice strains, interphase lattice misfit, and grain-orientation texture during creep deformation of the ferritic superalloy at 973 K (700 °C). The creep mechanisms and particle-dislocation interactions have been studied from the macroscopic creep behavior. At a low stress level of 107 MPa, the dislocation-climb-controlled power-law creep is dominant in the matrix phase, and the load partition between the matrix and the precipitate phases remains constant. However, intergranular stresses develop progressively during the primary creep regime with the load transferred to 200 and 310 oriented grains along the axial loading direction. At a high stress level of 150 MPa, deformation is governed by the thermally activated dislocation glide (power-law breakdown) accompanied by the accelerated texture evolution. Furthermore, an increase in stress level also leads to load transfer from the plastically deformed matrix to the elastically deformed precipitates in the axial direction, along with an increase in the lattice misfit between the matrix and the precipitate phases.

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Acknowledgments

This work was supported financially by the U.S. Department of Energy (DOE), Office of Fossil Energy, under Grants DE-FG26-06NT42732 and DE-09NT0008089. The work has benefitted from the use of the Lujan Neutron Scattering Center at LANSCE, which is funded by the Office of Basic Energy Sciences (DOE). Los Alamos National Laboratory is operated by the Los Alamos National Security LLC under the DOE Contract DE-AC52-06NA-25396. The authors would like to thank Prof. Morris Fine, Prof. Gautam Ghosh at Northwestern University, Prof. Mark Asta at University of California, Berkeley, and Prof. Chain T. Liu at the City University of Hong Kong for their collaborations in this program. Note that the TEM work was published in Ref. [4] and was conducted by Prof. Gautam Ghosh. Y.F. Gao acknowledges support from the Center for Defect Physics, an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, University of Tennessee, Knoxville, TN, 37996, USA

    Shenyan Huang (PhD Candidate), Zhenke Teng (PhD Student), Yanfei Gao (Associate Professor) & Peter K. Liaw (Professor, Ivan Racheff Chair of Excellence)

  2. Lujan Center, Los Alamos National Laboratory, Los Alamos, NM, 87545, USA

    Donald W. Brown (Scientist) & Bjørn Clausen (Scientist)

  3. Computer Science and Mathematics Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831, USA

    Yanfei Gao (Associate Professor)

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  1. Shenyan Huang
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  2. Donald W. Brown
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  3. Bjørn Clausen
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  4. Zhenke Teng
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  5. Yanfei Gao
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  6. Peter K. Liaw
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Correspondence to Peter K. Liaw.

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Manuscript submitted March 15, 2011.

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Huang, S., Brown, D.W., Clausen, B. et al. In Situ Neutron-Diffraction Studies on the Creep Behavior of a Ferritic Superalloy. Metall Mater Trans A 43, 1497–1508 (2012). https://doi.org/10.1007/s11661-011-0979-2

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