Improvement of High Temperature Mechanical Property by Precipitation Hardening of Reduced Activation Ferritic/Martensitic Steels

Journal Article · Tue Jul 15 04:00:00 UTC 2003 · Fusion Science and Technology

OSTI ID:20849512

Sakasegawa, H ^[1]; Kohyama, A ^[2]; Katoh, Y ^[2]; Tamura, M ^[3]; Khono, Y ^[4]; Kimura, A ^[2]

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1. Graduate school of Energy Science, Kyoto University (Japan)
2. Institute of Advanced Energy, Kyoto University (Japan)
3. National Defense Academy (Japan)
4. Muroran Institute of Technology (Japan)

Reduced Activation Ferritic/Martensitic steels (RAFs) are leading candidates for blanket and first wall structures of the D-T fusion reactors. Recently, in order to achieve better efficiency of energy conversion by using RAFs in advanced blanket systems, improvement of high temperature mechanical property of RAFs is desired. In this work, experimental alloys, FETA-series (Fe-Ta-C or N) steels, were prepared to observe precipitation hardening mechanism by MX-type particles at elevated temperatures in detail. According to the results, innovative improvement of creep property can be achieved by applying of precipitation hardening by very fine TaX (X=C, N) particles. With increasing tantalum content, finer dispersion of MX-type particles, dislocation structures and sub-grain structures were observed by TEM (Transmission Electron Microscopy). These fine structures contributed to the improvement of creep property.

• OSTI ID: 20849512
• Journal Information: Fusion Science and Technology, Journal Name: Fusion Science and Technology Journal Issue: 1 Vol. 44; ISSN 1536-1055
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CREEP
DISLOCATIONS
EFFICIENCY
ENERGY CONVERSION
FERRITIC STEELS
FINE STRUCTURE
FIRST WALL
MARTENSITIC STEELS
PARTICLES
PRECIPITATION HARDENING
TANTALUM
THERMONUCLEAR REACTOR MATERIALS
THERMONUCLEAR REACTORS
TRANSMISSION ELECTRON MICROSCOPY