Abstract
The effect of Mn addition on the tellurium (Te) corrosion and Te embrittlement resistance have been systematically investigated by comparing the standard GH3535 alloy and high-Mn one. After corroded in Te vapor at 700 °C, the more MnTe and (Cr, Mn)3O4 particles are formed on the surface in the high-Mn alloy than that in standard one. The high-Mn alloy possesses more MnTe particles at the grain boundaries near the surface. In the standard alloy, the Te mainly exist in the form of segregation at grain boundaries, and the distribution depth is more than that of MnTe in high-Mn alloy. The tensile tests indicated that the high-Mn alloy exhibits the higher ultimate tensile strength and elongation than the standard one in the corroded state. The deeper intergranular cracks can be observed from the gauge of tensile speicmens of standard alloy. These facts proved that the high-Mn alloy is more resistant to Te embrittlement. By connecting the corrosion and embrittlement behaviors, it can be concluded that Te embrittlement can be significantly improved by transforming the Te segregation into the intergranular MnTe tellurides. Our study provides one new protection strategy for the tellurium embrittlement of alloys, which seems to be more applicable to the harsh service environment.
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