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Title: Indentation size effect in unirradiated and ion-irradiated 800H steel at high temperatures

Abstract

Nanoindentation is a widespread and useful method for evaluating mechanical properties at the sub-micron length scale. However, the indentation size effect remains a major obstacle to obtain meaningful macroscopic mechanical properties from small volume testing. Here, this work systematically addresses the Indentation Size Effect (ISE) phenomenon as a function of temperature and defect density in an austenitic Fe-Cr-Ni alloy (800H) to establish the baseline for nanoindentation testing of ion-irradiated alloys in environmental conditions. The 800H steel sample was irradiated with 70 MeV Fe9+ at 450 °C to the total dose of 20.68 dpa. All samples were tested up to 300 °C in order to quantify the effect of temperature on the indentation size effect. It was found that in all cases, the ISE is less pronounced at high temperatures due to the increase of the plastic zone size. For the same grain orientation, the ISE is less pronounced in the irradiated 800H at all temperatures.

Authors:
 [1];  [2];  [3];  [4];  [1]
  1. Univ. of California, Berkeley, CA (United States)
  2. Bruker Nano Surfaces, Minneapolis, MN (United States)
  3. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  4. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1879274
Alternate Identifier(s):
OSTI ID: 1549532
Report Number(s):
LLNL-JRNL-837727
Journal ID: ISSN 1359-6454; 1057625; TRN: US2307628
Grant/Contract Number:  
AC52-07NA27344; AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 144; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; Nanoindentation; Indentation size effect; Ion-irradiation

Citation Formats

Prasitthipayong, A., Vachhani, S. J., Tumey, S. J., Minor, A. M., and Hosemann, P. Indentation size effect in unirradiated and ion-irradiated 800H steel at high temperatures. United States: N. p., 2017. Web. doi:10.1016/j.actamat.2017.11.001.
Prasitthipayong, A., Vachhani, S. J., Tumey, S. J., Minor, A. M., & Hosemann, P. Indentation size effect in unirradiated and ion-irradiated 800H steel at high temperatures. United States. https://doi.org/10.1016/j.actamat.2017.11.001
Prasitthipayong, A., Vachhani, S. J., Tumey, S. J., Minor, A. M., and Hosemann, P. Sat . "Indentation size effect in unirradiated and ion-irradiated 800H steel at high temperatures". United States. https://doi.org/10.1016/j.actamat.2017.11.001. https://www.osti.gov/servlets/purl/1879274.
@article{osti_1879274,
title = {Indentation size effect in unirradiated and ion-irradiated 800H steel at high temperatures},
author = {Prasitthipayong, A. and Vachhani, S. J. and Tumey, S. J. and Minor, A. M. and Hosemann, P.},
abstractNote = {Nanoindentation is a widespread and useful method for evaluating mechanical properties at the sub-micron length scale. However, the indentation size effect remains a major obstacle to obtain meaningful macroscopic mechanical properties from small volume testing. Here, this work systematically addresses the Indentation Size Effect (ISE) phenomenon as a function of temperature and defect density in an austenitic Fe-Cr-Ni alloy (800H) to establish the baseline for nanoindentation testing of ion-irradiated alloys in environmental conditions. The 800H steel sample was irradiated with 70 MeV Fe9+ at 450 °C to the total dose of 20.68 dpa. All samples were tested up to 300 °C in order to quantify the effect of temperature on the indentation size effect. It was found that in all cases, the ISE is less pronounced at high temperatures due to the increase of the plastic zone size. For the same grain orientation, the ISE is less pronounced in the irradiated 800H at all temperatures.},
doi = {10.1016/j.actamat.2017.11.001},
journal = {Acta Materialia},
number = ,
volume = 144,
place = {United States},
year = {Sat Nov 04 00:00:00 EDT 2017},
month = {Sat Nov 04 00:00:00 EDT 2017}
}

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Cited by: 32 works
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Scale effect investigation of copper microwire's mechanical properties after in situ scanning electron microscope twisting
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