Abstract
In this paper, the effect of thermal-induced phase transformation in Inconel 625 alloy on corrosion behavior in high-temperature molten NaCl-KCl-MgCl2 salt was investigated. The results showed that the corrosion behavior was effectively influenced by the redistribution of Cr induced by the thermal-induced phase transformation. The Cr-rich chain carbides at the grain boundary and the Cr-rich regions between the needle-like δ phases formed the continuous Cr-rich channels from the grain boundary to the grain interior, which aggravated the inhomogeneous distribution of Cr and promoted the corrosion process. On this basis, the corrosion process occurred with the selective dissolution of the Cr element and invasion of Mg and O, which led to surface corrosion products composed of MgO/MgCr2O4 and subsurface corrosion holes. The research results of this paper are useful for understanding the role of phase transformation in superalloys during high-temperature molten salt corrosion.
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