# US 9,038,359 B2 · Rotary implement having hard metallic layer and method therefor > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,038,359 B2 - Document ID: US9038359B2 - Status: Granted - Kind: B2 - Application number: 13/674,485 - Filed: 2012-11-12 - Published: 2014-05-15 - Granted: 2015-05-26 - Earliest claimed: 2012-11-12 - Assignees: Deere & Company - Applicants: Brent A. Augustine; James W. Musser; Amber Resch - Inventors: Brent A. Augustine; James W. Musser; Amber Resch - Web page: https://patentgrep.com/patent/US9038359B2 ## CPC - A01D 34/73: Cutting apparatus - B22F 3/22: for producing castings from a slip - C23C 24/103: {Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides} - C23C 24/106: {Coating with metal alloys or metal elements only} - B22F 3/115: by spraying molten metal, i.e. spray sintering, spray casting - B22F 7/08: with one or more parts not made from powder {(B22F7/062 takes precedence)} - B22F 10/25: Direct deposition of metal particles, e.g. direct metal deposition [DMD] or laser engineered net shaping [LENS] - B22F 10/36: of energy beam parameters - B22F 12/42: Light-emitting diodes [LED] - B22F 2005/001: {Cutting tools, earth boring or grinding tool other than table ware} - B23K 10/02: Plasma welding - Y02P 10/25: Process efficiency - A01D: HARVESTING; MOWING - B22F: WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER (making alloys by powder metallurgy C22C); APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER - C23C: COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL (making metal-coated products by extrusion B21C23/22; covering with metal by connecting pre-existing layers to articles, see the relevant places, e.g. B21D39/00, B23K; metallising of glass C03C; metallising mortars, concrete, artificial stone, ceramics or natural stone C04B41/00; enamelling of, or applying a vitreous layer to, metals C23D; treating metal surfaces or coating of metals by electrolysis or electrophoresis C25D; single-crystal film growth C30B; by metallising textiles D06M11/83; decorating textiles by locally metallising D06Q1/04) - B23K: SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM - Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS ## Abstract A rotary implement includes a metallic body that is rotatable around an axis. The metallic body includes a tapered leading edge having an interface surface and an opposite, free surface. The metallic body has a first composition. A metallic layer has a first side surface that is attached to the interface surface and a free, second side surface opposite from the first side surface. The metallic layer has a second, different composition from the first composition. A rotary machine can include an actuator and the rotary implement operably coupled to the actuator. A method for making a rotary implement includes providing the metallic body that has the tapered leading edge having the interface surface and the opposite, free surface. The metallic layer is then attached to the interface surface of the metallic body. ## Claims ### Claim 1 A rotary implement comprising: a metallic body rotatable around an axis, the metallic body including a tapered leading edge having an interface surface and an opposite, free surface, the metallic body having a first composition; a metallic layer having a first side surface attached to the interface surface and a free, second side surface opposite from the first side surface, the metallic layer having a second, different composition from the first composition; wherein the first composition includes a boron-containing steel composition and a bainitic microstructure; and wherein the free surface includes a polymer-based layer thereon. ### Claim 2 (depends on 1) The rotary implement as recited in claim 1, wherein the tapered leading edge is a cutting edge. ### Claim 3 (depends on 1) The rotary implement as recited in claim 1, wherein the second composition is a nickel-based composition. ### Claim 4 (depends on 1) The rotary implement as recited in claim 1, wherein the second composition is a cobalt-based composition. ### Claim 5 (depends on 1) The rotary implement as recited in claim 1, wherein the second composition is an iron-based composition. ### Claim 6 (depends on 1) The rotary implement as recited in claim 1, wherein a second hardness H2 of the metallic layer is greater than 1000 HV and a first hardness of the metallic body is between 300-600 HV. ### Claim 7 (depends on 1) The rotary implement as recited in claim 1, wherein the metallic body has a first hardness H1 and the metallic layer has a second hardness H2 such that a ratio of H2/H1 is from 1.0 to 4.5. ### Claim 8 (depends on 7) The rotary implement as recited in claim 7, wherein the ratio is at least 1.67 and the metallic layer has an average thickness of less than one millimeter. ### Claim 9 (depends on 1) The rotary implement as recited in claim 1, wherein the metallic layer extends along only the tapered leading edge of the metallic body. ### Claim 10 (depends on 1) The rotary implement as recited in claim 1, wherein the first side surface of the metallic layer is directly metallically bonded to the interface surface of the tapered leading edge. ### Claim 11 (depends on 1) The rotary implement as recited in claim 1, wherein the second composition includes tungsten carbide dispersed through a matrix selected from the group consisting of nickel-based metal, cobalt-based, and iron-based metal. ### Claim 12 (depends on 11) The rotary implement as recited in claim 11, wherein the second composition has, by weight, 10-90% of the tungsten carbide and a remainder of the matrix. ### Claim 13 A rotary machine comprising: an actuator; a rotary implement operably coupled to the actuator, the rotary implement including a metallic body rotatable around an axis, the metallic body including a tapered leading edge having an interface surface and an opposite, free surface, the metallic body having a first composition, and a metallic layer having a first side surface attached to the interface surface and a free, second side surface opposite from the first side surface, the metallic layer having a second, different composition from the first composition; wherein the first composition includes a boron-containing steel composition and a bainitic microstructure; and wherein the free surface includes a polymer-based layer thereon. ### Claim 14 (depends on 13) The rotary machine as recited in claim 13, wherein the first composition is a steel composition and the second composition is selected from the group consisting of a nickel-based compositions, cobalt-based compositions and iron-based compositions. ### Claim 15 (depends on 13) The rotary machine as recited in claim 13, wherein the metallic body has a first hardness H1 and the metallic layer has a second hardness H2 such that a ratio of H2/H1 is from 1.0 to 4.5. ### Claim 16 (depends on 15) The rotary machine as recited in claim 15, wherein the ratio is at least 1.67 and the metallic layer has an average thickness of less than one millimeter. ### Claim 17 A method for making a rotary implement, the method comprising: providing a metallic body including a tapered leading edge having an interface surface and an opposite, free surface, the metallic body having a first composition; attaching a metallic layer to the metallic body, the metallic layer including a first side surface that is attached to the interface surface and a free, second side surface opposite from the first side surface, the metallic layer having a second, different composition from the first composition; wherein the first composition includes a boron-containing steel composition and a bainitic microstructure; and wherein the free surface includes a polymer-based layer thereon. ### Claim 18 (depends on 17) The method as recited in claim 17, wherein the attaching includes applying a powder having the second composition to the interface surface, and consolidating the powder using an energy beam. ### Claim 19 (depends on 17) The method as recited in claim 17, further comprising establishing the metallic body to have a first hardness H1 and the metallic layer to have a second hardness H2 such that a ratio of H2/H1 is from 1.0 to 4.5. ### Claim 20 (depends on 17) The method as recited in claim 17, wherein the attaching comprises applying a slurry including a powder of the second composition and a carrier fluid to the interface surface, removing the carrier fluid and consolidating the powder to form the metallic layer.