Abstract
The high temperature oxidation and high temperature sulfuration behavior of Inconel 740H alloy were studied by field emission scanning electron microscope (FESEM) and other equipments. The results show that the surface film formed by high temperature sulfuration of 740H alloy was looser and easier to fall off compared to surface film formed by high temperature oxidation. The oxide film obtained by high temperature oxidation contained two layers. The outer one was mainly composed of Cr2O3 and Ti2O3 phase, while the inner one was mainly composed of Al2O3 phase. The surface film obtained by high temperature sulfuration contained three layers. The outer one was mainly composed of Cr2O3 and Ti2O3 phase, the inner one was mainly composed of S and Cr compounds, and the middle one was mainly composed of inner oxide Al2O3. The depth of internal sulfuration zone increases as sulfuration temperature rises.
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