Plasma and Fusion Research
Volume 6, 2405091 (2011)
Regular Articles
- 1)
- National Institute for Fusion Science, 322-6 Oroshi-cho, Toki 509-5292, Japan
- 2)
- Institute of Plasma Physics, Chinese Academy Sciences, Hefei 230031, China
Abstract
In this work, effects of low levels of stress during aging at 823 and 973 K for 100 h on mechanical properties and microstructures were investigated for JLF-1 and CLAM steels. The results showed that hardness decreased and tensile strength increased after aging at 823 K for 100 h with stresses from 9 to 100 MPa for the both steels. The improvement of tensile properties was due to increase in number density of precipitates, especially with small size. On the contrary, hardness, tensile and creep strength decreased after aging at 973 K for 100 h, suggesting softening. The degradation of these properties was accelerated by applying stresses of 30 and 50 MPa during the aging. Decrease in number density of precipitates, partial recovery of martensitic structures and coarsening of lath width, were responsible for the degradation of mechanical properties at 973 K for 100 h and under applied stress.
Keywords
fusion blanket, reduced activation ferritic/martensitic steel, thermal aging, low levels of stress, mechanical property, microstructural evolution
Full Text
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This paper may be cited as follows:
Yanfen LI, Takuya NAGASAKA and Takeo MUROGA, Plasma Fusion Res. 6, 2405091 (2011).