Influence of grain size on tellurium corrosion behaviors of GH3535 alloy

• DOI: 10.1016/j.corsci.2018.12.007
• Publication Date: 2018-12-11T17:46:41Z
• Authors: Li Jiang; Cai-Tao Fu; Bin Leng; Yan-yan Jia; Xiang-Xi Ye; Wen-Zhu Zhang; Qin Bai; Shuang Xia; Zhi-Jun Li; Fang Liu; Xing-Tai Zhou
• Keywords: 0103 physical sciences; 01 natural sciences

Abstract The effects of grain size on the tellurium corrosion behaviors have been investigated systematically in GH3535 alloy. After the exposure to Te vapor, the triple-layer scales, which consist of Ni3Te2, Cr3Te4, MnTe, M6C carbides and Fe-riched γ phase, occur in both the fine-grained and coarse-grained specimens. The thicker outer layer, the more discrete inner layer, the shallower Te permeation and Cr3Te4 existence along grain boundaries can be observed in the fine-grained specimens. By comparing the Gibbs free energies and calculating the effective diffusion coefficients, the tellurization mechanism and the role of grain size were discussed.