Method of processing maraging steel

Inactive Publication Date: 2010-02-18
UNITED TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0004]The disclosed methods of processing a workpiece of maraging steel are intended to provide economic processing and improved mechanical properties.

Problems solved by technology

Although the above thermal processing is effective for obtaining the martensitic microstructure, a particular end use of the maraging steel may require other processing steps which alter the final microstructure and mechanical properties of the maraging steel.

Method used

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  • Method of processing maraging steel
  • Method of processing maraging steel

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Embodiment Construction

[0012]FIG. 1 illustrates an example method 20 of processing a workpiece of maraging steel 22 (see FIG. 2). The disclosed workpiece of maraging steel 22 may have any form, such as a sheet, ingot, or casting. As will be described, the method 20 may be used to economically process the workpiece of maraging steel 22 to provide improved properties.

[0013]The workpiece of maraging steel 22 is formed of a maraging steel alloy composition. For example, the maraging steel alloy composition includes 17 wt %-19 wt % of nickel, 8 wt %-12 wt % of cobalt, 3 wt %-5 wt % of molybdenum, 0.2 wt %-1.7 wt % of titanium, 0.05 wt %-0.15 wt % of aluminum, and a balance of iron. As can be appreciated, the composition may vary from the given example composition. In some examples, the given composition consists essentially of the given elements and impurities that do not affect the properties of the alloy or elements that are unmeasured or undetectable in the alloy. For example, the alloy generally does not i...

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Abstract

A method of processing a workpiece of maraging steel includes receiving a workpiece of maraging steel that has been subjected to thermomechanical processing at an austenite solutionizing temperature and then directly aging the workpiece of maraging steel at an aging temperature to form precipitates within a microstructure of the workpiece of maraging steel, without any intervening heat treatments between the thermomechanical processing and the direct aging.

Description

BACKGROUND OF THE INVENTION[0001]This disclosure relates to maraging steel and, more particularly, to an economic method of processing maraging steel to achieve improved mechanical properties.[0002]Maraging steel grades are generally regarded as high strength steels that do not include carbon. The high strength is obtained through thermal processing to form a predominantly martensitic microstructure. For instance, maraging steels are typically solution annealed at a temperature sufficient to form an austenite phase and then cooled to room temperature to transform the austenite phase into the martensitic phase. Several solution annealing steps are typically used to provide a homogenous microstructure. The maraging steel may subsequently be aged at a lower temperature to precipitation harden the maraging steel.[0003]Although the above thermal processing is effective for obtaining the martensitic microstructure, a particular end use of the maraging steel may require other processing st...

Claims

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Application Information

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IPC IPC(8): C21D8/00C21D6/02C22C38/08
CPCC21D6/001C22C38/105C21D6/02C21D6/007
Inventor DAS, GOPAL
Owner UNITED TECH CORP
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