Evaluation of high-temperature tensile properties of reduced activation ferritic steels by small punch test

Toshiya Nakata, Shin Ichi Komazaki, Motoki Nakajima, Yutaka Kohno, Hiroyasu Tanigawa, Kiyoyuki Shiba, Akira Kohyama

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)


Reduced activation ferritic/martensitic steels (RAFs) are one of the leading candidates for structural materials of fusion reactors. Since there are severe limitations on specimen capacity at material irradiation testing facilities, it is required to use miniaturized specimens. In the previous study, it was revealed that the small punch (SP) creep test was useful technique for evaluating the creep rupture strength of RAFs. If this SP test technique was applicable to the measurement of not only the creep properties but also the high-temperature tensile properties, it would have an important meaning from the standpoints of designing and developing more superior fusion reactor materials. In this study, the SP test were carried out at 823-923 K to investigate the applicability using two representative RAFs, JLF-1 and F82H. The experimental results revealed that the load at initial localized plastic straining, F y, and the maximum load, F max, determined by the SP test were well correlated with the yield strength, σ y, and the ultimate tensile strength, σ B, respectively. The empirical linear correlation between the F y and the σ y was expressed by σ y = 1.5F y + 19. Similarly, there was an almost linear correlation between the F max and the σ B represented by σ B = 0.37F max + 86. Consequently, the high-temperature tensile properties of the RAFs can be also estimated by the SP test and the above empirical equations.

Original languageEnglish
Pages (from-to)642-645
Number of pages4
JournalNippon Kinzoku Gakkaishi/Journal of the Japan Institute of Metals
Issue number8
Publication statusPublished - Aug 2006


  • Fusion reactor structural materials
  • High-temperature tensile properties
  • Miniaturized specimen
  • Reduced activation ferritic/martensitic steels
  • Small punch test

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry


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