Journal of Shanghai University(Natural Science Edition) ›› 2015, Vol. 21 ›› Issue (2): 152-159.doi: 10.3969/j.issn.1007-2861.2014.05.012

• Metallurgical Materials • Previous Articles     Next Articles

Feasibility and benefits of applying grain boundary engineering to fuel cladding materials of liquid metal cooled fast breeder reactor

XIA Shuang, ZHOU Bang-xin   

  1. (Institute of Materials, Shanghai University, Shanghai 200072, China)
  • Received:2015-03-01 Online:2015-04-29 Published:2015-04-29

Abstract: Feasibility and benefits of applying grain boundary engineering (GBE) to the fuel cladding material 316 or 15-15Ti austenitic stainless steels of sodium-cooled-fastreactor for reducing void swelling and creep is discussed. GBE can be used to greatly enhance the proportion of low  coincidence site lattice (CSL) grain boundaries that are mainly of annealing twins and its variants. The cladding tubes are normally subjected to 20% cold working after solution annealing before using, which by virtue of providing a dislocation strewn matrix microstructure, contributes to the annihilations of irradiationinduced point defects. If the proportion of low CSL grain boundaries are greatly enhanced prior to the cold working, transfer of slip across the special-structured grain boundaries or pile-up against them during deformation may alter the distribution of dislocations of the microstructure, which may accommodate more defects generated during being irradiated.

Key words: 15-15Ti stainlesssteel, 316Ti stainless steel, creep, fuel cladding, grain boundary engineering (GBE), void swelling

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