Implication of grain boundary engineering on high temperature hot corrosion of alloy 617

Title
Implication of grain boundary engineering on high temperature hot corrosion of alloy 617
Authors
K. DeepakSumantra MandalC.N. Athreya김동익B. de BoerV. Subramanya Sarma
Keywords
Superalloys; SEM; High temperature corrosion; Segregation
Issue Date
2016-05
Publisher
Corrosion science
Citation
VOL 106, 293-297
Abstract
The role of grain boundary engineering (GBE) on high-temperature hot corrosion behavior of alloy 617 was evaluated by exposing both the as-received (AR) and GBE specimens in a salt-mixture of (75% Na2SO4 + 20% NaCl + 5% V2O5) at 1273 K for 24 h. The AR specimen having continuous network of random high angle grain boundaries (HAGBs) has undergone hot corrosion and substantial depletion/segregation of alloying elements through the entire cross section. The GBE specimen exhibited significantly reduced hot corrosion and depletion/segregation of alloying elements. This is attributed to the high fraction of 3-CSL triple junctions which break the percolation in the random HAGBs network.
URI
http://pubs.kist.re.kr/handle/201004/58702
ISSN
0010938X
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KIST Publication > Article
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