Abstract
In order to evaluate the mechanical properties of ODS superalloy joints bonded by pulsed electric-current sintering (PECS) technique, the tensile test at elevated temperature and creep rupture test were conducted for MA956 (Fe-based ODS alloy) and MA754 (Ni-based ODS alloy) joints. The ODS superalloys were bonded at 1323-1373 K for 0.9-64.8 ks in vacuum. The tensile properties at elevated temperature of completely densificated joints were almost comparable to those of base metal. However, the creep rupture lives of joints could be improved by the further holding at bonding temperature after the fully densification. The creep rupture lives of joint bonded for 64.8 ks reached about 70% of longitudinal directional life of base metal. TEM observations revealed that Cr2O3 inclusions existed on the prior particle boundary (PPB), and percentages of Cr2O3 inclusions on PPB were decreased with increasing the bonding time. The strengthen particles of oxide(Y2O3) were uniformly dispersed in the whole area of bonded interlayer without coagulating and coarsening. These results suggested that the improvement in creep rupture strength with bonding time was mainly attributed to the amelioration of the bonding strength of PPB.
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