The effect of grain orientation on nanoindentation behavior of model austenitic alloy Fe-20Cr-25Ni
Abstract
Instrumented nanoindentation was used in this paper to investigate the hardness, elastic modulus, and creep behavior of an austenitic Fe-20Cr-25Ni model alloy at room temperature, with the indented grain orientation being the variant. The samples indented close to the {111} surfaces exhibited the highest hardness and modulus. However, nanoindentation creep tests showed the greatest tendency for creep in the {111} indented samples, compared with the samples indented close to the {001} and {101} surfaces. Scanning electron microscopy and cross-sectional transmission electron microscopy revealed slip bands and dislocations in all samples. The slip band patterns on the indented surfaces were influenced by the grain orientations. Deformation twinning was observed only under the {001} indented surfaces. Finally, microstructural analysis and molecular dynamics modeling correlated the anisotropic nanoindentation-creep behavior with the different dislocation substructures formed during indentation, which resulted from the dislocation reactions of certain active slip systems that are determined by the indented grain orientations.
- Authors:
-
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- Univ. of Tennessee, Knoxville, TN (United States). Dept. of Materials Science and Engineering
- Publication Date:
- Research Org.:
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
- Sponsoring Org.:
- USDOE Office of Nuclear Energy (NE), Nuclear Reactor Technologies (NE-7). Nuclear Energy University Program (NEUP); USDOE
- OSTI Identifier:
- 1376458
- Alternate Identifier(s):
- OSTI ID: 1549626
- Grant/Contract Number:
- AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 138; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; Slip; Twinning; Creep; Anisotropy; 709
Citation Formats
Chen, Tianyi, Tan, Lizhen, Lu, Zizhe, and Xu, Haixuan. The effect of grain orientation on nanoindentation behavior of model austenitic alloy Fe-20Cr-25Ni. United States: N. p., 2017.
Web. doi:10.1016/j.actamat.2017.07.028.
Chen, Tianyi, Tan, Lizhen, Lu, Zizhe, & Xu, Haixuan. The effect of grain orientation on nanoindentation behavior of model austenitic alloy Fe-20Cr-25Ni. United States. https://doi.org/10.1016/j.actamat.2017.07.028
Chen, Tianyi, Tan, Lizhen, Lu, Zizhe, and Xu, Haixuan. Wed .
"The effect of grain orientation on nanoindentation behavior of model austenitic alloy Fe-20Cr-25Ni". United States. https://doi.org/10.1016/j.actamat.2017.07.028. https://www.osti.gov/servlets/purl/1376458.
@article{osti_1376458,
title = {The effect of grain orientation on nanoindentation behavior of model austenitic alloy Fe-20Cr-25Ni},
author = {Chen, Tianyi and Tan, Lizhen and Lu, Zizhe and Xu, Haixuan},
abstractNote = {Instrumented nanoindentation was used in this paper to investigate the hardness, elastic modulus, and creep behavior of an austenitic Fe-20Cr-25Ni model alloy at room temperature, with the indented grain orientation being the variant. The samples indented close to the {111} surfaces exhibited the highest hardness and modulus. However, nanoindentation creep tests showed the greatest tendency for creep in the {111} indented samples, compared with the samples indented close to the {001} and {101} surfaces. Scanning electron microscopy and cross-sectional transmission electron microscopy revealed slip bands and dislocations in all samples. The slip band patterns on the indented surfaces were influenced by the grain orientations. Deformation twinning was observed only under the {001} indented surfaces. Finally, microstructural analysis and molecular dynamics modeling correlated the anisotropic nanoindentation-creep behavior with the different dislocation substructures formed during indentation, which resulted from the dislocation reactions of certain active slip systems that are determined by the indented grain orientations.},
doi = {10.1016/j.actamat.2017.07.028},
journal = {Acta Materialia},
number = ,
volume = 138,
place = {United States},
year = {Wed Jul 26 00:00:00 EDT 2017},
month = {Wed Jul 26 00:00:00 EDT 2017}
}
Web of Science
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