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A kind of preparation method of high-speed tool steel

A high-speed tool steel and steel billet technology, applied in metal processing equipment, etc., can solve the problems of material processing cracks and mechanical property degradation, and achieve the effects of reducing liquid carbides, refining grains, and uniform mechanical properties

Active Publication Date: 2020-04-28
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a semi-solid thermal processing process that eliminates or reduces coarse liquefied carbides and refined grains in high-speed tool steel, and solves the problems caused by large liquefied carbides, coarse grains or mixed crystals in high-speed tool steel. Problems of processing cracks and mechanical property degradation of materials

Method used

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  • A kind of preparation method of high-speed tool steel
  • A kind of preparation method of high-speed tool steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] The weight of the experimental material M2 tool steel billet is 1 ton, and the specification is φ500×700mm. After chemical analysis, its specific composition is shown in Table 1.

[0048] The chemical composition of high-speed tool steel M2 in table 1 * embodiment 1 (weight percent, %)

[0049] element C Si mn S P Ni Cr Mo Cu V W Fe Measured ingredients 0.85 0.035 0.25 ≤0.03 ≤0.04 ≤0.03 4.10 5.0 0.1 1.90 6.40 Remain

[0050] *Liquidus T of this component L at 1445°C, the solidus T S It is 1245°C.

[0051] Semi-solid processing of M2 steel billet, the specific steps are as follows:

[0052] 1) Place a φ500×700mm billet in a crucible, heat up to 1465°C at a heating rate of 60°C / h, keep it warm for 1.5 hours, and then pour it out of the furnace into an iron mold.

[0053] 2) Cool the billet temperature to 1265°C at a cooling rate of 50°C / h, take it out of the iron mold when the billet temperature has cooled to 1265°C, ...

experiment example 1

[0065] For Example 1 and Comparative Example 1, the metallographic microscope is used to analyze the sample structure state of the as-cast billet central region (250mm position below the surface), and the specific metallographic structure is shown in figure 1 (a), it can be seen that due to solidification segregation, there are a large number of dendrites and liquid carbides in the as-cast structure, and the specific morphology of carbides figure 1 (b), the main carbide types are MC, M6C and M2C.

[0066] Analyze the microstructure of the sample in the central area of ​​the billet after forging (150mm below the surface). For the specific metallographic structure, see figure 2 , it can be seen that after the conventional forging process is adopted, a large amount of liquid precipitated carbides still remain in the high-speed tool steel, and they are distributed in a network shape ( figure 2 (a)), while using the large deformation process in the solid-liquid two-phase region ...

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Abstract

The invention relates to the field of hot processing of steel, and to a method for preparing high-speed tool steel. A method for preparing high-speed tool steel, which method includes the following process steps: 1) heating the ledeburite high-speed tool steel billet material to be processed to the liquidus line T L above, to completely melt it; 2) Cool the material to T L ~T S Insulate the solid-liquid two-phase zone between them to obtain a semi-solid structure with a solid phase ratio of more than 70%; 3) Deform the material in the solid-liquid two-phase zone with a forging ratio of more than 1.5; 4) Cool the material to the solidus line T S At the following temperatures, continue to implement deformation with a forging ratio of 1.5 or more, and it will be obtained. By implementing deformation in the solid-liquid two-phase region, the present invention can effectively break dendrites formed during the solidification process of high-speed tool steel, reduce dendrite segregation, inhibit the precipitation of liquid carbides, achieve a homogenized structure, and improve comprehensive mechanical properties. , the purpose of extending service life.

Description

technical field [0001] The invention relates to the field of thermal processing of steel, and relates to a preparation method of high-speed tool steel, specifically a semi-solid thermal processing process for eliminating or reducing coarse liquefied carbides and refining grains of high-speed tool steel, which is used to solve the problem of In high-speed tool steels, large pieces of liquefied carbides, coarse grains or mixed grains lead to the degradation of mechanical properties of materials. Background technique [0002] With its good formability and excellent mechanical properties, iron and steel materials affect all aspects of human production and life, and are the most successful and popular metal materials in human history. Human beings have never stopped exploring the smelting and processing technology of iron and steel materials. In recent years, with the modernization and high-speed development of my country's transportation industry and weapons and equipment, high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D18/02B21J5/00
CPCB21J5/004B22D18/02
Inventor 贾鹏王恩刚
Owner NORTHEASTERN UNIV LIAONING
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