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.
Claims18
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:
- silicon carbide and boron carbide, and wherein at least a portion of the first iron-based material comprises martensite and retained austenite,
- wherein the hardness in the first region is from 55 to 65 Rockwell C (HRC) and wherein the martensite in the first region comprises high-carbon martensite;
- and
- the hardfacing layer further comprising a second region interior to the first region, the second region comprising a second iron-based material, the second iron-based material further comprises:
- silicon carbide and boron carbide, and wherein at least a portion of the second iron-based material comprises martensite and retained austenite,
- wherein the hardness in the second region is from 40 to 55 Rockwell C (HRC) and wherein the martensite in the second region comprises low-carbon, lath martensite;
- and
- such that high-carbon martensite and retained austenite is observed near a surface of the hardfacing layer, and lath martensite with retained austenite is observed at a junction of the hardfacing layer and the metal surface.
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:
- silicon carbide, and wherein at least a portion of the first iron-based material comprises martensite and retained austenite,
- wherein the hardness in the first region is from 55 to 65 Rockwell C (HRC) and wherein the martensite in the first region comprises high-carbon martensite;
- and
- the hardfacing layer further comprising a second region interior to the first region, the second region comprising a second iron-based material, the second iron-based material further comprises:
- silicon carbide, and wherein at least a portion of the second iron-based material comprises martensite and retained austenite,
- wherein the hardness in the second region is from 40 to 55 Rockwell C (HRC) and wherein the martensite in the second region comprises low-carbon, lath martensite;
- and
- such that high-carbon martensite and retained austenite is observed near a surface of the hardfacing layer, and lath martensite with retained austenite is observed at a junction of the hardfacing layer and the metal surface.
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:
- boron carbide, and wherein at least a portion of the first iron-based material comprises martensite and retained austenite,
- wherein the hardness in the first region is from 55 to 65 Rockwell C (HRC) and wherein the martensite in the first region comprises high-carbon martensite;
- and
- the hardfacing layer further comprising a second region interior to the first region, the second region comprising a second iron-based material, the second iron-based material further comprises:
- boron carbide, and wherein at least a portion of the second iron-based material comprises martensite and retained austenite,
- wherein the hardness in the second region is from 40 to 55 Rockwell C (HRC) and wherein the martensite in the second region comprises low-carbon, lath martensite;
- and
- such that high-carbon martensite and retained austenite is observed near a surface of the hardfacing layer, and lath martensite with retained austenite is observed at a junction of the hardfacing layer and the metal surface.
Dependencies are inferred from the claim text.