Effect of yttrium on intergranular embrittlement behavior of GH3535 alloy induced by tellurium

The influence of yttrium (Y) addition on the tellurium (Te) induced intergranular embrittlement of Ni-16Mo-7Cr alloy was investigated. The results show that the addition of Y remarkedly reduces the diffusion depth of Te into the alloy, and thus improves the intergranular cracking resistance of the alloy. The YTe phases on the surface reaction layer and near-surface grain boundaries, plays an important role in fixing Te and slowing down the Te diffusion. Adding more than 0.05 wt% Y into the alloy does not continuously improve the intergranular embrittlement resistance, and even damages the mechanical properties.

Automated summary

The influence of yttrium (Y) addition on the tellurium (Te) induced intergranular embrittlement of Ni-16Mo-7Cr alloy was investigated. The addition of Y remarkably reduces the diffusion depth of Te into the alloy, improving its intergranular cracking resistance. The presence of YTe phases on the surface reaction layer and near-surface grain boundaries plays a crucial role in fixing Te and slowing down its diffusion. However, excessive Y addition (>0.05 wt%) does not continuously improve the intergranular embrittlement resistance, and can even damage the mechanical properties.