Yoshinori Murata

Rapidly solidified MC carbide morphologies of a laser-glazed single-crystal nickel-base superalloy

Rapidly solidified MC (TiC type) carbide morphology and its evolution with solidification cooling rate were studied comprehensively for a laser-glazed hot-corrosion resistant single-crystal nickel-base superalloy. The rapidly solidified interdendritic MC carbide was found in flower-like or radially branching morphologies which are closely related to the solidification cooling rate. At a relatively low cooling rate (9 X 10(3) K s-1), the carbide takes up the flower-like morphology, in which a few thick plates grow radially from the central nucleus. As the cooling rate increases, the growth morphology changes from flower like to radially dendritic and finally to well-developed radially branching colonies. The growth mechanism of the rapidly solidified MC carbide was confirmed to be lateral growth from the ledges or steps existing on the growing interface. The branching of the well-developed highly branching carbide occurs from the twins or twin intersections on the advancing fronts.

Design and development of hot

AbstractAs the first step to design and develop the new hot corrosion-resistant nickel-base single-crystal superalloys by thed-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-(0~3)Ta-(0~3)W-(0~3)Mo (in atomic percent)) was conducted with the alloy design theory. The critical conditions for suppressing the precipitation of the brittle σ phase can be described by the electronic parametersn

An electronic approach to alloy design and its application to Ni-based single-crystal superalloys

overline {Mdt} leqslant 0.991

Effect of transition elements on the properties of MC carbides in IN-100 nickel-based superalloy

n andn

Electron irradiation induced disordering of short range ordered (Ti, Mo)Cx carbide

overline {Mdgamma } leqslant 0.93

Evaluation of the phase stability of modified IN738LC alloys with New Phacomp

n 0.93 which can be applied to thed-electrons alloy design of hot corrosion resistant nickel-base superalloys with high Cr contents.