To continue the oriented crystal structure in a material to be repaired to an additional extending part and to improve the strength in the interface of additioned extending part by using the end part of the material to be repaired as crystal seed for oriented solidifying growth of molten preform, at the time of forming and repairing an integral extending part to the end part of a gas turbine blade, turbine shroud, etc.
At the time of forming the additioned extending part, firstly, a mandrel suitable to the shape of the extending end surface in the material to be repaired is fitted to this end surface, and a ceramic mold 16 is formed to over the outer surface of the mandrel and the extending end part 4 in the material to be repaired. After removing the mandrel, the preform 82 is added into the formed mold cavity and melted with an induction heating means 13 to make molten material 26 suitable to a superalloy composition of the material to be repaired. To this molten material 26, sufficient time is held so that the end part of the material to be repaired acts the crystal seed for growing micro structure. Thereafter, the temp. gradient, by which growing speed as the integral extending part in the molten material 26 becomes the max. at the interface with the material to be repaired, is kept and the molten material is solidified.
BEWLAY BERNARD PATRICK
RITTER ANN MELINDA
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