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A method for preparing high-solubility ultra-fine grain high-speed steel by using electric pulse

A technology of ultra-fine grain and high-speed steel, which is applied in the direction of manufacturing tools, heat treatment equipment, heat treatment process control, etc., to achieve short process flow, improve hardness and toughness, and realize the effect of ultra-fine grain

Active Publication Date: 2020-06-02
HUBEI UNIV OF AUTOMOTIVE TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no related technology that can achieve the double effect of promoting the ultra-fine grain size of high-speed steel and increasing the amount of carbide dissolution.

Method used

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  • A method for preparing high-solubility ultra-fine grain high-speed steel by using electric pulse
  • A method for preparing high-solubility ultra-fine grain high-speed steel by using electric pulse
  • A method for preparing high-solubility ultra-fine grain high-speed steel by using electric pulse

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Experimental program
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Embodiment example

[0036] The material is M2 high-speed steel widely used in the market. A workpiece with a size of φ10x60mm is taken and heated to 1180°C in a vacuum tube furnace. After holding for 10 minutes, it is quenched and cooled to room temperature in quenching oil. figure 2 shown). Temper the pre-quenched high-speed steel workpiece at 550°C for 1 hour and then air-cool it to obtain the pre-heat treatment microstructure (such as image 3 shown). The average grain size of the preliminary heat treatment is 20 μm, and the matrix is ​​distributed with eutectic carbides and fine secondary carbides precipitated by tempering.

[0037] Turn on the power supply 3 of the electric pulse device, and connect to the grid. Turn on the charging power supply 3, the transformer 4 and the energy storage 5 through the control system 1 to complete the energy storage charging process.

[0038] The high-speed steel workpiece 10 after preliminary heat treatment is polished smooth, and the two ends are clamp...

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Abstract

The invention discloses a method for preparing high-solid-solubility ultrafine grain high-speed steel through electric pulses. The method includes the steps that high-speed steel is subjected to conventional austenitizing and then quenched and tempered; then the two ends of the steel are clamped between electrodes of electric pulse equipment, the high-speed steel is discharged in the air environment, the temperature of the material rises to the austenitizing temperature region through pulse currents, austenite grains are ultrafine, and dissolution of carbide is promoted; after electric pulse discharge is completed, quenching is completed through an automatic quenching device; and finally the high-solid-solubility ultrafine grain high-speed steel in a quenched state through electric pulse treatment is tempered three times, and the high-speed steel with excellent comprehensive mechanical performance is obtained. By means of the method, the technical bottleneck that in the traditional heat treatment process, high-speed steel grain refinement and carbide dissolution promotion cannot be taken into account is solved, and the double effects that the high-speed steel austenite grains are ultrafine, and the dissolution quantity of the carbide is increased are achieved. The method is short in technological process, energy saving and high efficiency are achieved, and the hardness and thetoughness of the high-speed steel can be simultaneously improved.

Description

technical field [0001] The invention relates to a processing technology for high-speed steel, in particular to a method for preparing high-solid-solubility ultra-fine-grain high-speed steel by using electric pulses. Background technique [0002] Grain ultra-refinement is an important technology to obtain excellent comprehensive mechanical properties of steel. The ultra-refinement technology of ferrite grains in steel has been widely used in industry, but for structural steels with martensite or tempered martensite and bainite structure, the ultra-refinement of grains requires The tenite grains are refined to less than 5 μm, and the related processes include cyclic heat treatment, reverse phase transformation of cold deformed martensite, and large plastic deformation. The cycle heat treatment process is cumbersome and consumes a lot of energy. The method of achieving ultra-fine austenite grains through plastic deformation requires a large amount of deformation, which requir...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C21D6/00C21D1/18C21D1/40C21D11/00
Inventor 张家陶
Owner HUBEI UNIV OF AUTOMOTIVE TECH
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