Nitrogen segregation and blister formation of 316LN austenitic steel during electron beam welding tests for ITER gravity supports

Lee, P.Y.; Hou, Bing; Wu, Jihong; Yang, Dan; Zhang, G.R.; Zhang, C.P.

doi:10.1016/j.jnucmat.2008.12.242

Cited by 6 publications

(2 citation statements)

References 5 publications

(5 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. Terms & Conditions of access and use can be found at http:// www.tandfonline.com/page/terms-and-conditions INTRODUCTION Gravity magnet support is one of key components of international thermonuclear experimental reactor (ITER) to sustain the toroidal field (TF) coils, which should endure several large forces, such as dead weight of the whole coils (more than 100MN), electromagnetic force, thermal stress, and seismic loads (in accident) [1][2][3]. Thermal anchor, an extra cooling system, is designed for the TF gravity magnet support to balance the temperature between magnet support basement (flexible plates) and TF magnet [3], as shown in Fig.…”

Section: Please Scroll Down For Articlementioning

confidence: 99%

Effects of Brazing Filler and Method on ITER Thermal Anchor Joint Crack

Chen¹,

Wu²,

Pei³

et al. 2014

Materials and Manufacturing Processes

View full text Add to dashboard Cite

Thermal anchor, one of the key components to keep temperature balance of gravity magnet support, should be avoided welding defects in its welding joints, which endure large forces when the international thermonuclear experimental reactor (ITER) fusion device is operating. The influences of brazing fillers and brazing methods on the cracks in joints of thermal anchor were investigated by microstructure analysis. The results have shown that the copper penetrating cracks were observed in the heat-affected zone (HAZ) of tungsten inert gas (TIG) arc brazing joints welded by CuSi3, CuSi3Mn, and Ag45CuSnNi brazing fillers, which are chiefly responsible for the diffusion and penetration of copper, derived from molten brazing filler metal into the 316L/316LN austenitic grain boundaries leading to embrittlement. The intimate contact between liquid copper and austenitic steel surface and the surface stress concentration of the austenitic steel are the main formative factors for the copper penetrating cracks. Adopting brazing fillers without containing copper or employing vacuum brazing can effectively avoid the copper penetrating cracks in the joints of ITER thermal anchor.

show abstract

Section: Please Scroll Down For Articlementioning

confidence: 99%

Effects of Brazing Filler and Method on ITER Thermal Anchor Joint Crack

Chen¹,

Wu²,

Pei³

et al. 2014

Materials and Manufacturing Processes

View full text Add to dashboard Cite

show abstract

“…Each flexible plate with a thickness of 30mm is jointed to the top and bottom flanges by welding, leaving 19 mm gap in any two adjacent flexible plates, as shown in figure 2. This design has to be given up after we made a weld experiment on it because the material 316LN has defects and small voids due to nitrogen segregation and migration from base material after welding [3]. Therefore an alternative design is performed without changing the material property and the boundary size of the GS, as shown in the Fig.…”

Section: Alternative Design For Gsmentioning

confidence: 99%

Preliminary Research of Manufacturing Technology for ITER Magnet Supports

Hou

Yang

et al. 2012

AMM

View full text Add to dashboard Cite

The International Thermal Experiment Reactor (ITER) is designed to operate for 20 years with high safety requirements. The magnets with their total weight being about 10,000t sit at the core of the ITER machine. In order to guarantee the safety of the ITER machine, the research of the manufacturing technology for ITER magnet supports (MS) is an indispensable working procedure before the MS are produced. The MS consist of toroidal field (TF) gravity supports (GS), poloidal field (PF) supports and correction coils (CC) supports. This paper summarizes that the preliminary research results for the manufacturing of the GS with thermal anchor, the reliable method to manufacture the U-shaped clamp with tapered slots for PF coil supports and the special devices for test of full-size fasteners used in all the MS.

show abstract