Microsegregation of Alloying Elements at Deformation-Induced Stacking Faults in a Powder Metallurgy Nickel-Base Superalloy

Specimens cut from a powder-metallurgy manufactured disk of the Russian nickel-base superalloy VZh178P have been tested for tensile strength at room temperature and creep strength at 750 degrees C. Transmission electron microscopy has shown that stacking faults and microtwins form in both cases during plastic deformation of the alloy. Creep testing at 750 degrees C causes segregation of alloying elements Cr, Co, Mo, and W at stacking faults, resulting first in a Suzuki atmosphere and then in the nucleation and growth of TCP particles with (Co, Cr)3(Mo, W) stoichiometry.

Automated summary

Specimens from a Russian nickel-base superalloy VZh178P, manufactured through powder metallurgy, were tested for their tensile and creep strength. It was found that stacking faults and microtwins were formed during plastic deformation of the alloy in both cases. Creep testing at 750 degrees C caused segregation of alloying elements, resulting in the formation of TCP particles.