Influence of grain size on tellurium corrosion behaviors of GH3535 alloy. (March 2019)

• Record Type: Journal Article
• Authors: Jiang, Li; Fu, Cai-Tao; Leng, Bin; Jia, Yan-yan; Ye, Xiang-Xi; Zhang, Wen-Zhu; Bai, Qin; Xia, Shuang; Li, Zhi-Jun; Liu, Fang; Zhou, Xing-Tai
• Is Part Of: Corrosion science. Volume 148(2019)
• Page Start: 110
• Page End: 122
• Publication Date: 2019-03
• Subjects: Grain size -- Tellurium -- Diffusion -- Grain boundaries -- GH3535 alloy; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2018.12.007
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Triple-layer scales occur in both the fine-grained and coarse-grained specimens. Fine-grained specimens possess the thicker outer layer and the discrete inner layer. Fine-grained specimens possess the shallower Te permeation along grain boundaries. Fine-grained specimens possess the shallower Cr3 Te4 existence along grain boundaries. Fine-grained specimens provide more paths for the outward diffusion of Cr. 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 Ni3 Te2, Cr3 Te4, MnTe, M6 C 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 Cr3 Te4 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.