Cold/Hot Deformation Induced Recrystallization of Nickel-Based Superalloys for Molten Salt Reactors

Metals

Jan Cerny¹  Jaromir Dlouhy¹  Peter Slama¹  Martina Koukolikova¹  Martin Marecek² 

[1] COMTES FHT a.s., Prumyslova 995, 334 41 Dobrany, Czech Republic;Centrum vyzkumu Rez s.r.o., Hlavní 130, 250 68 Husinec-Řež, Czech Republic;

关键词: nickel-based alloys;    MoNiCr;    HN80MTY;    recrystallization;    corrosion;    MSR structural materials;   

DOI  :  10.3390/met8070477

来源: DOAJ

【 摘 要 】

A new special structural nickel-based alloy for use in molten fluoride salt environments in molten salt reactors (MSR) began to be developed by the COMTES FHT Company in the Czech Republic as early as 2001. The outcome of this development was the MoNiCr alloy, an alternative to Hastelloy-N. The present study was carried out on two experimentally-manufactured nickel alloys: MoNiCr and HN80MTY. Its purpose was to activate recrystallization processes in the as-cast microstructure of these alloys. In addition, experiments were performed to find a temperature which produces complete recrystallization. Static and dynamic recrystallization was studied in both alloys as well. An important aspect was to determine the lowest amount of deformation which still ensures complete recrystallization and provides as uniform recrystallized grains as possible. Such microstructure is well-suited for subsequent forming operations. Specimen microstructures were characterized using light microscopy (LM), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and electron backscatter diffraction (EBSD). Furthermore, corrosion tests of the MoNiCr alloy were conducted.

【 授权许可】

Unknown