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Plastic processing method for powder metallurgy high-speed steel

A technology of powder metallurgy and plastic processing, which is applied in the field of powder metallurgy high-speed steel extrusion deformation, can solve the problems of coarse carbide structure and uneven carbide distribution, and achieve good wear resistance, low cost, and improved hardness and toughness. Effect

Inactive Publication Date: 2011-11-23
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is to solve the coarse carbide structure and uneven distribution of carbides in the existing powder metallurgy high-speed steel, to provide a simple process, low cost, high production efficiency, low energy consumption, and make the powder Plastic processing method of powder metallurgy high-speed steel with greatly improved hardness and toughness of metallurgical high-speed steel

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Example 1: Select water atomized M2 high speed steel powder, see Table 2 for the components. The pressure of 800 MPa is used to press the shape, and the blank size is Φ52×60mm, and then the cold pressed blank is placed in a vacuum sintering furnace for vacuum sintering, and the vacuum degree is 10 -3 Pa, sintering temperature 1100°C, keep warm for 2 hours, and then cool to room temperature with the furnace; heat the high-speed steel billet after sintering to 900°C, keep it warm for 30 minutes, preheat the extrusion die to 400°C, and use oil-based Lubricate with graphite or graphite milk, then put the sintered and heated high-speed steel billet into the extrusion die, and the inner surface of the extrusion die is lubricated with oil-based graphite. Put the blank into the mold for extrusion, the extrusion ratio is 8, and the movement speed of the extrusion punch is 20mm·S -1 , The extrusion force is 400MPa. Extrude to obtain a rod Φ18mm.

[0018] Table 2 Chemical compo...

Embodiment 2

[0021] Example 2: Select water atomized M3 high-speed steel powder, see Table 3 for the components. The pressure of 900 MPa is used to press the shape, and the blank size is Φ52×60mm, and then the cold pressed blank is placed in a vacuum sintering furnace for vacuum sintering, and the vacuum degree is 10 -3 Pa, sintering temperature 1200°C, heat preservation for 2 hours, and then cool to room temperature with the furnace; heat the sintered high-speed steel billet to 1000°C, heat preservation for 30 minutes, preheat the extrusion mold to 400°C, and then sinter the heated high-speed steel billet The material is put into the extrusion die, and the inner surface of the extrusion die is lubricated with oil-based graphite. Put the billet into the mold for extrusion, the extrusion ratio is 16, and the movement speed of the extrusion punch is 25mm·S -1 , The extrusion force is 500MPa. Extrude to obtain a rod with a diameter of Φ13mm.

[0022] Table 3 Chemical composition of M3 high...

Embodiment 3

[0025] Example 3: Select water atomized M4 high speed steel powder, see Table 4 for the components. The pressure of 1000 MPa is used to form the blank, the size of the billet is Φ52×60mm, and then the cold compact is placed in a vacuum sintering furnace for vacuum sintering, and the vacuum degree is 10 -3 Pa, the sintering temperature is 1260°C, keep it warm for 2 hours, and then cool to room temperature with the furnace; heat the sintered high-speed steel billet to 1100°C, keep it warm for 30 minutes, preheat the extrusion mold to 400°C, and then sinter the heated high-speed steel billet The material is put into the extrusion die, and the inner surface of the extrusion die is lubricated with oil-based graphite. Put the blank into the mold for extrusion, the extrusion ratio is 27, and the movement speed of the extrusion punch is 30mm·S -1 , The extrusion force is 600MPa. Extrude to obtain a rod Φ10mm.

[0026] Table 4 Chemical composition of M4 high-speed steel powder in Ex...

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Abstract

The invention relates to a plastic processing method for powder metallurgy high-speed steel. The plastic processing method comprises the following steps of: firstly compression-molding water-atomized high-speed steel powder by adopting a pressure of 800-1000MPa; putting a cold-pressed blank in a vacuum sintering furnace, and sintering the cold-pressed blank in vacuum, wherein the vacuum degree is10<-3> Pa, and the sintering temperature is 1100 DEG C to 1300 DEG C; insulating the heat for 2 hours; cooling the cold-pressed blank to room temperature together with the furnace; heating the sintered blank to 900-1100 DEG C; insulating the heat for 30 minutes; preheating an extruding die to 400 DEG C; putting the blank into the extruding die; and extruding the blank under the conditions that the extruding ratio is 8-27 and the speed of a punch of the extruding die is 20-30 mm.S<-1>. Products produced in the invention can obtain tiny and uniform microscopic structures, and carbide and nonmetallic impurities are distributed in a dispersive manner in the sintering process. Extruded materials have higher hardness and bending resistance, and the hardness of the extruded materials can reach more than 66.8HRC without any heat treatment.

Description

technical field [0001] The invention relates to a metal material plastic processing method, in particular to a powder metallurgy high-speed steel extrusion deformation method. Background technique [0002] High speed steel is the abbreviation of high speed tool steel. Since its inception, high-speed steel has excellent cutting performance due to its unique metallurgical composition and subsequent heat treatment process, so it has been widely used in machine tool and tool manufacturing industries, promoting the development of industry and social progress. Through heat treatment, high-speed steel can obtain extremely high hardness (HRC 63-70) and high wear resistance, and can still maintain high hardness (above HRC 60) at 550 ℃ ~ 600 ℃, so its main use is to manufacture various The cutting tools of machine tools are also partially used in high-load molds, aviation high-temperature bearings and special heat-resistant and wear-resistant parts. [0003] In recent years, with th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D7/02C22C33/02
Inventor 张文丛于洋
Owner HARBIN INST OF TECH AT WEIHAI
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