On the origin of tellurium corrosion resistance of hot-rolled GH3535 alloy.

• Hot-rolled specimens possess the more Cr 3 Te 4 and MnTe in the scales. • Te tends to be trapped by the primary M 6 C carbides to form flake-like Cr 3 Te 4. • Hot-rolled specimens possess the shallower and fewer Te penetration and cracks. The tellurium (Te) corrosion behaviors of the hot-rolled GH3535 alloy have been investigated systematically in this study as compared with the standard solid-solution treated one. In the hot-rolled alloy, the higher proportion of Cr 3 Te 4 and MnTe can be observed in the corrosion scales. Beneath the scales, Te was found to enrich in the primary M 6 C carbides rather than at the grain boundaries. The blocking effect by the protective Cr 3 Te 4 and MnTe and the trapping effect by the primary M 6 C carbides jointly contribute to the better Te corrosion and cracking resistance of the hot-rolled alloy. [ABSTRACT FROM AUTHOR]