Effect of low energy helium irradiation on mechanical properties of 304 stainless steel

T. Kawakami, K. Tokunaga, N. Yoshida

Research output: Contribution to journalConference article

5 Citations (Scopus)

Abstract

Mechanical properties of low energy He irradiated 304SS have been investigated by means of tensile test and nano-identation hardness tests. Specimen size is 2.8 mm × 5.4 mm × 0.1 mm in gauge and 12.4 mm in total length. Specimens are irradiated with 8 keV helium ions at R.T., 573 K and 873 K up to the fluence of 3 × 1021 He/m2. Tensile tests are performed on unirradiated and irradiated specimens at a strain rate of 3.33 × 10-3 s-1. In every irradiation condition, one specimen is tested to failure and the other two specimens are strained plastically to 10% and 20%. Formation of blisters with a diameter of about 500 nm is observed on the surface of tensile-tested specimens after R.T. irradiation. Some exfoliation of the blisters is also observed. When the irradiation temperature increases, a large number of cracks with a size of about several micrometers are formed on the surface together with exfoliation during the tensile test. The yield stress of specimens irradiated at R.T. and 573 K increases about 10% in comparison with that of the unirradiated specimen. The result of nano-indentation tests indicate that hardness near the surface increases depending on the irradiation temperature.

Original languageEnglish
Pages (from-to)335-340
Number of pages6
JournalFusion Engineering and Design
Volume81 A
Issue number1-4
DOIs
Publication statusPublished - Feb 1 2006
EventProceedings of the Seventh International Symposium on Fusion Nuclear Technology ISFNT-7 Part A -
Duration: May 22 2005May 27 2005

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Helium
Stainless Steel
Stainless steel
Irradiation
Mechanical properties
Nanohardness
Nanoindentation
Gages
Yield stress
Strain rate
Hardness
Ions
Cracks
Temperature

All Science Journal Classification (ASJC) codes

  • Civil and Structural Engineering
  • Nuclear Energy and Engineering
  • Materials Science(all)
  • Mechanical Engineering

Cite this

Effect of low energy helium irradiation on mechanical properties of 304 stainless steel. / Kawakami, T.; Tokunaga, K.; Yoshida, N.

In: Fusion Engineering and Design, Vol. 81 A, No. 1-4, 01.02.2006, p. 335-340.

Research output: Contribution to journalConference article

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AB - Mechanical properties of low energy He irradiated 304SS have been investigated by means of tensile test and nano-identation hardness tests. Specimen size is 2.8 mm × 5.4 mm × 0.1 mm in gauge and 12.4 mm in total length. Specimens are irradiated with 8 keV helium ions at R.T., 573 K and 873 K up to the fluence of 3 × 1021 He/m2. Tensile tests are performed on unirradiated and irradiated specimens at a strain rate of 3.33 × 10-3 s-1. In every irradiation condition, one specimen is tested to failure and the other two specimens are strained plastically to 10% and 20%. Formation of blisters with a diameter of about 500 nm is observed on the surface of tensile-tested specimens after R.T. irradiation. Some exfoliation of the blisters is also observed. When the irradiation temperature increases, a large number of cracks with a size of about several micrometers are formed on the surface together with exfoliation during the tensile test. The yield stress of specimens irradiated at R.T. and 573 K increases about 10% in comparison with that of the unirradiated specimen. The result of nano-indentation tests indicate that hardness near the surface increases depending on the irradiation temperature.

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