METHOD FOR MANUFACTURING Ni-BASE SUPPERALLOY INGOT COMPOSED OF LITTLE COMPONENT-SEGREGATION AND UNIFORMLY FINE CRYSTAL GRAIN

摘要

PROBLEM TO BE SOLVED: To provide a method for manufacturing an Ni-base supperalloy ingot composed of little component-segregation and uniformly fine crystal grains as a blank for manufacturing forged parts used for a gas turbine, such as a jet engine for aircraft, e.g. a turbine disk, a turbine shaft, etc.;SOLUTION: A shallow pool 5 of a molten Ni-base supperalloy is formed by remelting a VIM ingot obtained by high frequency induction vacuum melting or an ESR ingot 2 obtained by electro-slag remelting after the high frequency induction vacuum melting with an electron beam 3. Then, after intermittently irradiating the obtained shallow pool 5 of the molten Ni-base supperalloy with the electron beam 4, the molten Ni-base supperalloy is immediately solidified.;COPYRIGHT: (C)2003,JPO