材料期刊网

As the first step to design and develop the new hot corrosion-resistant nickel-base single-crystal superalloys by the d-electrons alloy design theory (or the New PHACOMP), an evaluation of the phase stability of the modified hot corrosion-resistant IN738LC nickel-base superalloys (Ni-16Cr-9.5Al-4.0Ti-8.0-Co-0.55Nb-0.06Zr-0.05B-0.47C-(0 approximately 3)Ta-(0 approximately 3)W-(0 approximately 3)Mo (in atomic percent)) was conducted with the alloy design theory. The critical conditions for suppressing the precipitation of the brittle sigma phase can be described by the electronic parameters MdtBAR less-than-or-equal-to 0.991 and MdgammaBAR less-than-or-equal-to 0.93 which can be applied to the d-electrons alloy design of hot corrosion resistant nickel-base superalloys with high Cr contents.