Manufacturing process for tungsten-attached U-shaped flow channel-containing first wall part for fusion reactor cladding

Abstract

The invention discloses a manufacturing process method for a tungsten-attached U-shaped flow channel-containing first wall part suitable for a fusion reactor cladding. Functionalization is achieved by compounding tungsten and a U-shaped flow channel-containing steel by adopting a hot isotatic pressure diffusion welding technology. The main points of the process steps are as follows: (1) machining and preparing a U-shaped steel tube material according to a design; (2) machining and preparing a tungsten piece with a coating; (3) machining and preparing an outer sheath tool; (4) performing hot isotatic pressure diffusion welding; (5) removing the sheath, and machining a first wall part with a required size. According to the manufacturing process, hybrid welding of dissimilar materials, a complex structure and a plurality of interfaces is realized by preparing the U-shaped steel tube material and the tungsten piece with the coating and performing a one-time overall hot isotatic pressure process; moreover, the part which is machined by the process does not have a performance weakening area for melting a welding seam, is dense and reliable in overall structure, and is particularly suitable for the preparation of the tungsten-attached first wall part for the fusion reactor cladding.

Description

technical field [0001] The invention relates to a manufacturing process for a first wall part of a tungsten-attached U-shaped flow channel, which is suitable for the cladding of a fusion reactor, and belongs to the field of metal diffusion welding. Background technique [0002] The cladding of the fusion reactor is one of the core components in the fusion reactor. It not only needs to realize the conversion and output of fusion energy, but also realizes the multiplication of tritium fuel. At the same time, the environment of the cladding components is extremely harsh. All present great challenges. Among them, the first wall of the cladding directly faces the plasma, and the service conditions are the most severe: it can withstand high-energy (14MeV) high-flux fusion neutron irradiation, high-energy and high-density α, D and other particle bombardment, corrosion of the breeding agent and cooling medium, etc. This places high demands on the material and structural performance...

AI Technical Summary

Problems solved by technology

And according to the existing design (as attached figure 1 ) The first wall part mainly consists of two parts: a U-shaped steel workpiece containing multiple sets of cooling channels and a thin tungsten protective armor. During the development of this part, two problems are faced: 1) the connection between tungsten and steel; 2) Processing and preparation of multiple groups of cooling channels in U-shaped steel workpieces

[0004] On the other hand, the internal flow channel of the first wall part has the characteristics of large scale (length: 2-3m) and small size (internal 8×8mm), and the entire flow channel is U-shaped, which cannot be manufactured by conventional processing methods. Although the casting method can be used to manufacture workpieces of this shape, it is difficult to overcome segregation and shrinkage during the casting process. In addition, the internal crystal structure of the casting cannot meet the service performance requirements under such harsh conditions; if the conventional fusion welding method is used to prepare this workpiece There will be very long and huge number of welds, it is difficult to control the quality, and the properties of the welds are quite different from those of the base material, so it is difficult to meet the first wall operation requirements

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