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Product Abstract

Program on Technology Innovation: Development of Small-Volume Mechanical Testing--Initial Application to Proton-Irradiated Stainless Steel

Product ID:3002005477
Date Published:31-Oct-2016
Pages:136
Implementation Category:
REFERENCE

Foundational building blocks for product research and development, often including scientific findings and field experience that feed into Category 1 or Category 2 recommendations.

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Sector Name:Nuclear
Document Type:Technical Results
Implementation Type:
EARLY R&D

Basic/early phase of R&D findings (3-5 yr outlook)

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Abstract

A comprehensive study was conducted to develop and deploy small-scale mechanical testing to evaluate localized failure in ion-irradiated (proton-irradiated) stainless steel. 304SS specimens in the as-irradiated (10 dpa full-cascade, 360oC), post-irradiation annealed, and unirradiated conditions are the focus of this work. All techniques applied (nanoindentation, microcompression, and microtensile testing) are in good agreement and, depending on the technique, one can quantify the change in hardness/yield strength, change in plasticity, and localized failure susceptibility. Nanoindentation can only access hardness and, indirectly, yield stress. In contrast, microcompression tests can provide partial stress strain curves and microtensile tests can be used to obtain entire stress-strain curves. The distinction arises because a tensile test has a well-defined point of failure whereas a compression tests does not; therefore, uniform and total elongation (to failure) can be obtained in a tensile test. Both of these techniques have clearly defined test volumes in comparison to nanoidentation. This advantage was demonstrated by locating the proton stopping-peak region (~100 dpa), which is ~1 mm wide, within a micropillar approximately 1.7 mm in diameter, to assess its mechanical behavior. The effective test volume of a “nanoindent” would be too large to isolate the mechanical behavior of such a narrow region. 

A key result of this study is that the as-irradiated condition, which is susceptible to localized failure, releases significantly more energy per slip event than the post-irradiation annealed and the unirradiated conditions, which are much less susceptible or not susceptible.  The average (energy/slip event) can be quantified and compared to the energy associated with the Peierls stress moving a dislocation across the sample width.  The average number of (dislocations/slip event) and the observed magnitude of slip steps for the different conditions are in good agreement 

Program
2016 Program 41.01.01   Primary Systems Corrosion Research (PSCR)
Keywords
  • Localized Deformation
  • Irradiation assisted stress corrosion cracking (IASCC)
  • Micromechanical testing
  • Micropillar compression
  • Microtensile testing
  • Small-scale mechanical testing
Report
000000003002005477
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