• Title/Summary/Keyword: Tungsten insert gas welding

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Strength Characteristics of Reduced Activation Ferritic Steel for Fusion Blanket by TIG Welding (핵융합로 블랭킷용 저방사화 철강재료 TIG 용접부의 강도특성)

  • ;;;A. Kohyama
    • Journal of Welding and Joining
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    • v.21 no.1
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    • pp.87-92
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    • 2003
  • JLF-1 steel (Fe-9Cr-2W-V-Ta), reduced activation ferritic steel, is one of the promising candidate materials for fusion reactor applications. Tensile properties of JLF-1 base metal and its TIG weldments has been investigated at the room temperature, $400^{\circ}C$ and $600^{\circ}C$. The tensile strength of base metal (JLF-1) showed the level between those of weld metal and the Heat Affected Zone (HAZ). When the test temperature was increased from room temperature to high temperature ($400^{\circ}C$ and $600^{\circ}C$), both strength and ductility decreased or base metal, weld metal and the HAZ. The longitudinal specimens of base metal represented similar strength and ductility at room temperature and high temperature, compared to those of transverse specimens. Little anisotropy for the rolling direction was observed in the base metal of JLF-1 steel.

Strength and fracture toughness of reduced - activation ferritic steel (JLF-1) for fusion reactor application (핵융합로용 저방사화 철강재료(JLF-1)의 강도와 파괴인성)

  • Yun, Han-Gi;Kim, Dong-Hyeon;Lee, Sang-Pil;Park, Lee-Hyeon;Gong, Yu-Sik;Katoh, Y.;Kohyama, A.
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.13-18
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    • 2003
  • Reduced activation ferritic steel, JLF-1 steel (Fe-9Cr-2W-V-Ta), is one of the promising candidate materials for fusion reactor applications. Fracture toughness ($J_IC$) and tensile tests were carried out at room temperature and elevated temperature ($400^{\circ}C$). Two types of CT specimen were prepared to examine the effect of rolling direction on the fracture toughness of JLF-1 steel. Four types of tensile specimen were also prepared to investigate the property by the rolling direction and welding. The Micro Vickers hardness was measured at various distances of a cross section of the TIG joints of JLF-1 steel according to the heating history of each position. Finally, the fracture surface was observed by scanning electron microscopy (SEM).

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Effect of specimen size on fracture toughness of reduced activation ferritic steel (JLF-l) (저방사화 철강재 (JLF-1)의 파괴인성에 미치는 시험편 크기의 영향)

  • Kim, Dong-Hyun;Yoon, Han-Ki;Park, Won-Jo;Katoh, Y.;Kohyama, A.
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2003.05a
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    • pp.300-305
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    • 2003
  • Reduced activation ferritic (JLF-1) steel is leading candidates for blanket/first-wall structures of the D-T fusion reactor. In fusion application, structural materials will suffer effects of repeated changes of temperature. Therefore, the data base of tensile strength and fracture toughness at operated temperature $400^{\circ}C$ are very important. Fracture toughness ($J_{IC}$) and tensile tests were carried out at room temperature and elevated temperature ($400^{\circ}C$). Fracture toughness tests were performed with two type size to investigate the relationship between the constraint effect of a size and the fracture toughness resistance curve. As the results, the tensile strength and the fracture toughness values of the JLF-1 steel are slightly decreased with increasing temperature. The fracture resistance curve increased with increasing plane size and decreased with increasing thickness. The fracture toughness values of JLF-1 steel at room temperature and at $400^{\circ}C$ shows an excellent fracture toughness ($J_{IC}$) of about $530kJ/m^2\;and\;340kJ/m^2$, respectively.

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