Abstract Scope |
The effects of grain boundary engineering (GBE) treatment, grain size and deformation state on the tellurium (Te) corrosion behaviors of GH3535 alloy have been investigated systematically in this study. It was found that GBE-treated alloy and the fine-grained one can effectively decrease the density and depth of Te diffusion along the grain boundaries respectively, which is related to the grain boundary character distribution. Moreover, the hot-rolled GH3535 can completely suppress the Te corrosion and Te-induce cracking both in depth and density. In the hot-rolled alloy, the higher proportion of Cr3Te4 and MnTe in the corrosion product scales help to impede the inward diffusion of Te atoms, and the high-density interfaces of the primary M6C carbides trap and exclude Te atoms from the grain boundaries, which jointly contribute to the better Te corrosion and cracking resistance of the hot-rolled alloy. |