Abstract
The influence of grain boundary serrations (GBS) on high-temperature hot corrosion in Alloy 617 was critically investigated by immersing both the as-received and GBS specimens in the salt mixture comprising of 75% Na2SO4 + 20% NaCl + 5% V2O5 at 1273 K for 24 h. The GBS microstrucure, realized through scheduled thermal treatment, exhibited enhanced resistance to corrosion damage against the as-received condition. On account of GBS, the diffusion of percolating elements through grain boundaries and subsequent enrichment/depletion of alloying elements is significantly restricted. More impressively, the serrated microstructure exhibited markedly reduced damage even after prolonged hot corrosion test (48 h).
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