Title:
【発明の名称】ニッケル鉄系合金インゴットの結晶粒のデルタ相による改善
Document Type and Number:
Japanese Patent JP2002539333
Kind Code:
A
Abstract:
An article is formed from an ingot of a nickel-iron base alloy having a composition including from about 4.5 weight percent niobium to about 5.5 weight percent niobium and capable of forming delta-phase precipitates, and having fewer than about 1 grain per square inch at 100x magnification. An array of intragranular delta-phase precipitates is precipitated within the ingot to provide grain nucleation sites. The ingot having the array of delta-phase precipitates therein is deformed at a temperature below a delta-phase solvus temperature, thereby producing a fine-grained billet.
Inventors:
Morra, Martin, M
Application Number:
JP2000605812A
Publication Date:
November 19, 2002
Filing Date:
March 15, 2000
Export Citation:
Assignee:
Wyman-Gordon Company
International Classes:
B22D29/00; C22C19/03; C22C19/05; C22F1/00; C22F1/10; (IPC1-7): C22F1/10; B22D29/00
Attorney, Agent or Firm:
Koichiro Kato