A.G.Padalko (1), A.N.Veselov (1), S.P.Avdukhin (2) and V.Ja.Shevchenko (3)
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(1) RAS Institute for Physical Chemistry of Ceramics, Moscow, Russia
(2) ABB Alstom Power Uniturbo, Moscow, Russia
(3) RAS Institute for Silicates Chemistry, St.Petersburg, Russia
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Ni-based superalloys are widely used as turbine blades material. To heal the casting defects, such as pores of from hundred micrometers down to submicrometer sizes, the barothermal influence (BTI) of pressures close to 200 MPa and temperatures near 1500 K was carried out in Ar. With the data of TEM, SEM and electron beam microprobe, it was established the linear dependence of the pressure, which is necessary for the pores removing, on the pores dimensions down to tenth of micrometers. Moreover, the secondary structure of the alloys, the morphology and size of the ('-phase precipitates were strongly dependent on BTI parameters - exposition time at high temperature, pressure and cooling rate. The optimum uniform cubic shape of the (' inclusions was achieved in the entire volume of the blades despite of their various cross section areas along length. Also conditions of boride and carbide phases dissolution under BTI were established.

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