Journal
SURFACE & COATINGS TECHNOLOGY
Volume 334, Issue -, Pages 19-28Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2017.11.023
Keywords
Gas Tungsten Arc Welding (GTAW); Microstructure; Interface; Precipitates; delta-Ferrite; Hardness; Corrosion resistance
Funding
- National key research and development program of China [2016YFB0700404]
- National Natural Science Foundation of China [51501216, 51371188, 51671122, 51671154, 51601213]
- Chinese Academy of Sciences [XDA02004210]
- Talent development fund of shanghai [201650]
- Natural Science Foundation of Shanghai [17ZR1436700, 15ZR1448500]
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Ni-201(ERNi-1), a cladding layer which is resistant to the corrosion of molten salts, was deposited on 304SS substrate by Gas Tungsten Arc Welding (GTAW). Microstructure characterization showed that the cladding interface was obviously divided into three zones from microstructures along depth, weld metal (WM), unmixed zone (UZ) and heat affected zone (HAZ). Element distribution presented that elements Ti, N, Si were segregated into interdendritic region of WM and formed the TiN precipitates during the solidification. The element distribution of UZ was similar to that of HAZ. A large quantity of vermicular delta-ferrite phases were precipitated in laminar UZ. Grain coarsening in HAZ was evident compared with the grains in base metal, and no precipitates were found in HAZ. The hardness of cladding layers was decreased from interface to surface. The cladding layer exhibited excellent corrosion resistance to molten FLiNaK salts.
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