[Table of Contents]

Plasma and Fusion Research

Volume 5, S1036 (2010)

Regular Articles

Long-Term Thermal Stability of Reduced Activation Ferritic/Martensitic Steels as Structural Materials of Fusion Blanket
Yanfen LI1,3), Takuya NAGASAKA2) and Takeo MUROGA2)
1)
The Graduate University for Advanced Studies, 322-6 Oroshi, Toki, Gifu 509-5292, JAPAN
2)
National Institute for Fusion Science, Oroshi, Toki, Gifu 509-5292, JAPAN
3)
Institute of Plasma Physics, Chinese Academy Sciences, Hefei, Anhui, China
(Received 7 January 2009 / Accepted 8 June 2009 / Published 26 March 2010)

Abstract

In this work, the effects of thermal ageing on mechanical properties of JLF-1 and CLAM steels have been studied at temperatures in a range of 823-973 K. The results showed that the hardness increased slightly and the creep properties improved after ageing at 823 K for 2000 h for the both steels. On the other hand, the hardness decreased after ageing above 823 K, especially at 973 K for 100 h, and the creep property degraded at 973 K for 100 h. The Larson-Miller parameter was used for predicting the long-term creep performance based on the short-term experiments at higher temperature with higher stress including the pre-ageing effects. By extrapolation to the typical blanket condition, 823 K for 100 000 h, the rupture stress was estimated to be about 140 MPa for the both steels. The present thermal ageing treatments influence the estimated rupture stress for about ±10 MPa for both steels.

Keywords

fusion blanket, reduced activation ferritic/martensitic steel, thermal stability, thermal ageing, creep property, Larson-Miller parameter

DOI: 10.1585/pfr.5.S1036

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This paper may be cited as follows:

Yanfen LI, Takuya NAGASAKA and Takeo MUROGA, Plasma Fusion Res. 5, S1036 (2010).