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

Journal Article · · Acta Materialia
 [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)

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.

Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC52-07NA27344; AC02-05CH11231
OSTI ID:
1879274
Alternate ID(s):
OSTI ID: 1549532
Report Number(s):
LLNL-JRNL-837727; 1057625; TRN: US2307628
Journal Information:
Acta Materialia, Vol. 144; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 32 works
Citation information provided by
Web of Science

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Cited By (3)

Scale effect investigation of copper microwire's mechanical properties after in situ scanning electron microscope twisting
  • Xue, Fengmei; Lu, Haojian; Shen, Yajing
  • Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, Vol. 233, Issue 10 https://doi.org/10.1177/0954406218818595
journal December 2018
Temperature-dependent nanoindentation response of materials journal February 2018
Indentation Size Effect in Pressure-Sensitive Polymer Based on A Criterion for Description of Yield Differential Effects and Shear Transformation-Mediated Plasticity journal March 2019