Journal
CORROSION SCIENCE
Volume 185, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109419
Keywords
Ni-based single-crystal superalloy; Laser shock peening; Hot corrosion; Microstructures; Residual stress
Funding
- National Natural Science Foundation of China [51775419, 51361026, 52071172]
- PhD research startup foundation of Nanchang Hangkong University [2010009401102]
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The study showed that laser shock peening improved the hot corrosion resistance of the Ni-based single-crystal superalloy by promoting the formation of protective oxide films due to the significantly different dislocation structures induced by LSP. Additionally, the hot corrosion mechanism of the LSP-treated superalloy was discussed.
The hot corrosion behavior of a Ni-based single-crystal (SC) superalloy treated by laser shock peening (LSP) against 75 wt.% Na2SO4+25 wt.% NaCl molten salts at 750 degrees C was studied. The results showed that LSP improved the hot corrosion resistance of the SC superalloy. This was attributed to significantly different LSP-induced dislocation structures in gamma/gamma' phases, which promoted the formation of protective layered oxide films that inhibited the inward diffusion of corrosive media. In addition, the hot corrosion mechanism of LSP-treated SC superalloy was discussed.
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