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Constant-temp. forging in the air for nickel-base super heat-resistant alloy

A superalloy, nickel-based technology, used in metal processing equipment and other directions, can solve problems such as increasing the complexity and cost of the forging process

Inactive Publication Date: 2004-04-14
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vacuum or inert atmosphere requirements add considerably to the complexity and cost of the forging process

Method used

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  • Constant-temp. forging in the air for nickel-base super heat-resistant alloy
  • Constant-temp. forging in the air for nickel-base super heat-resistant alloy
  • Constant-temp. forging in the air for nickel-base super heat-resistant alloy

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Embodiment Construction

[0019] Figure 1 depicts a preferred method of practicing the invention. Step 20 is to provide a forging blank. This forging blank is prepared from a forged nickel-based superalloy. As used herein, an alloy is a nickel-based alloy when nickel is present in excess of other elements; and when strengthened by the deposition of gamma prime or other related phases, it further forms a nickel-based superalloy. Rene TM 88DT and ME3 are two nickel-based superheat-resistant alloys with special properties, Rene TM The nominal composition of 88DT is by weight: 13% cobalt, 16% chromium, 4% molybdenum, 3.7% titanium, 2.1% aluminum, 4% tungsten, 0.75% niobium, 0.015% boron, 0.03% Zirconium, 0.03% carbon, up to about 0.5% iron, the balance is nickel and a small amount of impurity elements; the nominal composition of alloy ME3 is by weight: about 20.6% cobalt, about 13.0% chromium, about 3.4% Aluminum, about 3.70% titanium, about 2.4% tantalum, about 0.90% niobium, about 2.10% tungsten, a...

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Abstract

A superalloy made of a forging nickel-base superalloy such as Rene TM 88DT or ME3 is forged in a forging press (40) having forging dies (52, 54) made of a die nickel-base superalloy. The forging is accomplished by heating a superalloy workpiece to a forging temperature of from about 1700 DEG F to about 1850 DEG F, and forging at that forging temperature and at a nominal strain rate. The die nickel-base superalloy is selected to have a creep strength of not less than a flow stress of the forging nickel-base superalloy at the forging temperature and strain rate.

Description

technical field [0001] The present invention relates to the forging of nickel-based superalloys, especially such forging in air. Background technique [0002] Nickel-based superalloys are used in parts of aircraft gas turbine engines, which must have extremely high performance requirements and deal with extremely adverse environmental conditions. Cast nickel-based superalloys are used, for example, as turbine blades. Wrought nickel-based superalloys are used, for example, as rotor discs and shafts. This invention relates to wrought nickel-based superalloys. [0003] Initially, wrought nickel-base superalloys were supplied in the form of ingots, where the ingots were cast from the melt, or consolidated powder bodies, where powders were consolidated . Consolidated powder bodies are the preferred raw material for many applications due to their uniform, easily controllable primary microstructure and small particle size. In either case the blank is progressively reduced in s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C19/05B21J5/02C22F1/10
CPCC22F1/10C22C19/056
Inventor E·L·雷蒙S·K·斯里瓦特萨
Owner GENERAL ELECTRIC CO
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