System, method and apparatus for hardfacing composition for earth boring bits in highly abrasive wear conditions using metal matrix materials

a technology of metal matrix and composition, applied in the field of hardfacing, can solve the problems of premature cracking and flaking of hardfacing, inadequate hardfacing toughness, premature eroded hardness and wear resistance, etc., and achieve the effect of high hardness

Inactive Publication Date: 2008-06-26
BAKER HUGHES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0012]Embodiments of a system, method, and apparatus for a highly abrasive wear metal matrix composite hardfacing material for downhole tools are disclosed. The hardfacing material may comprise a matrix of relatively softer material with high hardness, such as amorphous nanocomposite steel alloys, and one or more hard component materials. Th...

Problems solved by technology

A hardfacing composition that is extremely hard and wear-resistant may lack fracture toughness, causing the hardfacing to crack and flake prematurely....

Method used

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  • System, method and apparatus for hardfacing composition for earth boring bits in highly abrasive wear conditions using metal matrix materials
  • System, method and apparatus for hardfacing composition for earth boring bits in highly abrasive wear conditions using metal matrix materials
  • System, method and apparatus for hardfacing composition for earth boring bits in highly abrasive wear conditions using metal matrix materials

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Embodiment Construction

[0018]Hardfacing materials formed from amorphous nanocomposite steel alloys, such as NANOSTEEL®, such as those now commercially available for plasma transferred arc (PTA) welding applications. Some recent materials are reported to have high hardness while retaining their toughness, which is desirable for impact loading.

[0019]One of the problems associated with conventional PTA nickel-based or iron-based hardfacing materials is that their retention of the hard component particles is compromised as the hardness of the softer material is increased. This may produce an embrittled deposit and compromise the hardfacing. However, as a result of improved application techniques, more exotic materials such as amorphous nanocomposite steel alloys may be utilized as a relatively softer material in conjunction with hard component materials on downhole tools.

[0020]For example, sintered tungsten carbide or cast tungsten carbide, e.g., spherical or crushed, monocrystalline or polycrystalline WC, or...

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Abstract

A highly abrasive wear metal matrix composite hardfacing material for downhole tools is disclosed. The hardfacing material may comprise a matrix of a softer material with high hardness, such as amorphous nanocomposite steel alloys, and one or more hard component materials. The hard component materials may comprise sintered tungsten carbide, monocrystalline WC, polycrystalline WC, and the additional component of spherical cast tungsten carbide. Alternatively, a matrix of softer material, hard component materials and crushed cast tungsten carbide may be used.

Description

[0001]This non-provisional patent application claims priority to and the benefit of U.S. Provisional Patent App. No. 60 / 871,270, which was filed on Dec. 21, 2006.BACKGROUND OF THE INVENTION[0002]1. Technical Field[0003]The present invention relates in general to hardfacing and, in particular, to an improved highly abrasive wear metal matrix composite hardfacing materials, such as for downhole tools.[0004]2. Description of the Related Art[0005]It is a long-standing practice in the design and manufacture of earth-boring bits to apply wear-resistant hardfacing materials to the surfaces of such bits that are subjected to abrasive wear during drilling operations. In earth-boring bits of the rolling cutter variety, these surfaces include the teeth of bits of the milled or steel tooth variety, the gage surfaces of the rolling cutters and the shirttails of the bit legs comprising the bit body.[0006]In the past, these hardfacing compositions generally comprise carbides of the elements of Gro...

Claims

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Application Information

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IPC IPC(8): E21B10/08C22C45/02B21K5/02
CPCB22F2005/001C22C29/08E21B10/50C23C30/005C22C45/02
Inventor OVERSTREET, JAMES LESLIE
Owner BAKER HUGHES INC
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