Carbide-based hardfacing
AssigneeVermeer Manufacturing Company
InventorsWanti MUCHTAR, David LANDON, Bjorn JOHNSON
Life of this patent
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Abstract
One aspect of the disclosure provides an iron-based hardfacing layer which includes hard or wear resistant phases resulting at least in part from dissolution of silicon and/or boron carbide particles into a liquid iron-based metal during the fabrication process. In an embodiment, the hardfacing layer is formed by a fusion welding process in which carbide particles are added to the molten weld pool. In an example, the filler metal supplied to the welding process is a mild steel. In an embodiment, the hardness as measured at the surface of the hardfacing ranges from 40 to 65 HRC. In an example, the iron-based hardfacing layer also includes tungsten carbide particles.
Claims21
-59. (canceled)
A hardfacing layer joined to at least a portion of a metal surface by a metal fusion bond, the hardfacing layer comprising a first region comprising a first iron-based material, wherein the first iron-based material further comprises:
- (1) silicon and carbon, and wherein at least a portion of the first iron-based material comprises martensite and retained austenite, or
- (2) boron and carbon, and wherein at least a portion of the first iron-based material comprises a metal carbide and a metal boride.
An iron-based hardfacing layer disposed on the surface of a workpiece, the iron-based hardfacing layer being made by the process of:
- a. welding an iron-based filler metal to the metal surface of the workpiece by gas metal arc welding, thereby generating a weld pool, the filler metal being used as an electrode in a welding gun;
- b. feeding a plurality of carbide particles towards the weld pool with a particulate delivery system, wherein the carbide particles comprise at least one of silicon carbide and boron carbide;
- c. moving the workpiece with respect to the welding gun the workpiece being moved so as to trace an oscillatory path having a predetermined frequency and amplitude of oscillation.
Dependencies are inferred from the claim text.