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Apr 19 – 22, 2022
Vienna, Austria
Europe/Vienna timezone
FR22 starts in Vienna 19 - 22 April 2022 Online Stream: https://event.do/iaea/a/#/events/5048

A novel method of manufacturing a heavy integrated support ring in fast reactor

Apr 20, 2022, 11:04 AM
12m
Vienna, Austria

Vienna, Austria

ORAL Track 4. Fast Reactor Materials (Coolants, Structures) and Components 4.2 Structural, Novel, and Large Components Materials

Speakers

Prof. Sun Mingyue (Institute of Metal Research, Chinese Academy of Sciences) Dr Xu Bin (Institute of Metal Research, Chinese Academy of Sciences) Dr Xie Bijun (Institute of Metal Research, Chinese Academy of Sciences) Prof. Li Dianzhong (Institute of Metal Research, Chinese Academy of Sciences)

Description

Support ring is a key heavy structural component of the sodium-cooled Fast Reactor (SFR), which supports the whole reactor vessel and the reactor internals, are subjected to high pressure and high temperature and other wind loads, seismic loads, dead loads etc. Therefore, the security and stability of the support ring is essential to nuclear reactor. As the support ring has a super large diameter up to 15.6 meters, it will theoretically consume more than 200 tons of stainless steel ingot. Unfortunately, it is basically impossible to make such heavy stainless steel ingot without segregation and shrinkage defects by using traditional manufacturing method. As an alternative, although the welding type of support ring could be manufactured successfully, the security and stability of the support ring will be significantly impaired due to several longitudinal welds. To tackle this grand challenge, we put forward a novel strategy to manufacture an integral weldless support ring (φ=15.6 m) by metal Additive Forging. In sharp contrast to the conventional wisdom that a heavy forging must be created by a larger roughcast, the core idea of this technique is to manufacture large high-quality component by building much smaller and cheaper metal slabs. The specific technological process is as follow. Before forging, the 316 stainless steel casting billets with cleaned surfaces are stacked in order and then vacuum-packaged by electron beam welder. Subsequently, the whole package is hot-compression bonded until the bonding interfaces were healed perfectly to form the initial billet. In order to obtain much larger billet, the initial billets are molded into the required billet shape and vacuum-packaged again by electron beam welder for secondary hot-compression bonding. After that, two initial billets are hot-compression bonded into a large billet required for ring rolling. Next, punching and broaching are performed on the cylindrical forging. Then, rolling process is carried out to acquire the required shape, size and microstructure. Finally, an integral support ring (φ=15.6 m) was manufactured successfully.

Speaker's email address mysun@imr.ac.cn
Affiliation/Organization Institute of Metal Research, Chinese Academy of Sciences
Country/Int. organization China
Speaker's title Mr

Primary authors

Prof. Sun Mingyue (Institute of Metal Research, Chinese Academy of Sciences) Dr Xu Bin (Institute of Metal Research, Chinese Academy of Sciences) Dr Xie Bijun (Institute of Metal Research, Chinese Academy of Sciences) Prof. Li Dianzhong (Institute of Metal Research, Chinese Academy of Sciences)

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