Weld repair of directionally solidified articles

A technology of directional crystallization and parts, applied in the direction of welding equipment, welding medium, welding equipment, etc., can solve problems such as insufficient repair, low toughness, uneven microstructure, etc.

Inactive Publication Date: 2005-12-07
GENERAL ELECTRIC CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when used on oriented crystallized parts, the result is an inadequate restoration, which may exhibit a less than defect-free parts for low toughness

Method used

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  • Weld repair of directionally solidified articles
  • Weld repair of directionally solidified articles
  • Weld repair of directionally solidified articles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] figure 1 It is a block flow diagram of the preferred method for implementing the present invention. Supplied with a directional crystal part, No. 20. figure 2 Such an orientated crystallization member 40 is shown, in this case a turbine blade of a gas turbine engine. The turbine blade 40 includes an airfoil 42 . When the turbine blade is operating in a gas turbine engine, the hot exhaust flow is impinging on the airfoil 42 . The turbine blade 40 is mounted to a turbine disk (not shown) with a dovetail 44 extending downwardly from the airfoil 42 and engaging a slot in the turbine disk. A lip 46 extends longitudinally outwardly from the region where the airfoil 42 and the dovetail 44 connect. There are internal passages which may run through the interior of the airfoil 42 , terminating in holes 48 in the face of the airfoil 42 . All or a portion of the part 40 may be covered with a protective coating. The invention is applicable to turbine blades, which is the pref...

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PUM

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Abstract

A directionally solidified nickel-based superalloy article (40) has a defect (58) therein extending parallel to the solidification direction (54). The article (40) is repaired by removing any foreign matter present in the defect (58), and then heating the article (40) to a repair temperature of from about 60 to about 98 percent of the solidus temperature of the base material in a chamber containing a protective gas that inhibits oxidation of the base material. The defect (58) is filled with a filler metal while maintaining the article (40) at the repair temperature. The filling is accomplished by providing a source of the filler metal of substantially the same composition as the base material of the directionally solidified article (40), and melting the filler metal into the defect (58) progressively while moving the source of the filler metal relative to the article (40) in a direction parallel to the solidification direction (54). Optionally, additional artificial heat extraction is accomplished in a heat-flow direction that is within about 45 degrees of the solidification direction (54), as the filler metal solidifies within the defect (58). The article (40) may thereafter be heat treated.

Description

technical field [0001] This invention relates to welding repair of parts having a directional grain structure produced by directional soilolification, and more particularly, it relates to welding repair of directionally crystallized nickel-based superalloys. background of the invention Background technique [0002] Metal parts can be made with directional crystalline grain structure to improve their high temperature mechanical properties. In directional crystallization, molten metal is cooled unidirectionally within a mold that defines the shape of the part from one end of the mold. Metal first solidifies at one end of the heat of precipitation and then solidifies along the length of the model as the temperature drops below the solidus temperature. The formed structure has grains elongated parallel to the length of the model and the direction of heat flow. The grain boundaries are also parallel to the heat flow direction. The grains typically exhibit a directional grain...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K31/00B23K31/02B23K35/30C22C19/05C22F1/00C22F1/10
CPCB23P6/007B23K31/02
Inventor R·W·斯马舍伊J·H·斯奈德B·L·博尼
Owner GENERAL ELECTRIC CO
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