METHOD FOR MANUFACTURING Ni-BASE SUPERALLOY 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 superalloy ingot composed of little component segregation and uniformly fine crystal grains, which is used as a blank for manufacturing forged parts used for gas turbine such as a jet engine for aircraft, e.g. a turbine disk, a turbine shaft, etc.;SOLUTION: In this manufacturing method, a shallow pool 5 of the molten Ni-base superalloy ingot 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 using an electron beam 3. Then, after adding metal powder 4 while holding a molten metal state having a prescribed temperature by irradiating the shallow pool 5 of the molten Ni-based superalloy with an electron beam 31, the Ni-base superalloy ingot composed of little component segregation and uniformly fine crystal grains is immediately manufactured.;COPYRIGHT: (C)2003,JPO