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Spray Formed High Toughness Tool Steel

A technology of spray forming and high toughness, which is applied in the field of tool steel, can solve the problem of low performance strength, toughness, wear resistance, and grindability of cast and forged tool steel, and it is difficult to meet the requirements of material performance and life stability. Restricting the widespread use of powder metallurgy tool steel and other issues to achieve the effects of wide application, excellent comprehensive mechanical properties, and improved nucleation rate

Active Publication Date: 2017-08-04
HEYE SPECIAL STEEL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the tool steel is mainly prepared by the traditional casting and forging process. The tool steel prepared by the casting and forging process is limited by the slow cooling and solidification of the molten steel in the process. The alloy composition is prone to segregation during the solidification process, forming a coarse carbide structure. Subsequent forging and rolling treatment, this bad structure will still have a negative impact on the properties of the alloy, resulting in a low level of cast and forged tool steel performance, including strength, toughness, wear resistance, and grindability, which is difficult to meet high-end processing and manufacturing. Requirements for material performance and life stability
The preparation of tool steel by powder metallurgy solves the problem of segregation of alloy elements, and the prepared alloy structure is fine and uniform. Compared with cast and forged alloys, the performance is greatly improved, but the problem is that the powder metallurgy process is complicated, the process is long, and the cost is high. Improvement, limiting the widespread use of powder metallurgy tool steel
The preparation of tool steel by spray forming process has been reported, but due to the unreasonable ratio of raw material components, the carbide structure of the produced tool steel is not ideal, and its performance is not excellent enough.

Method used

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  • Spray Formed High Toughness Tool Steel
  • Spray Formed High Toughness Tool Steel
  • Spray Formed High Toughness Tool Steel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This example involves a group of spray-formed high-toughness tool steels, the chemical composition of which is shown in Table 1.1:

[0037] Table 1.1 Chemical Composition of Spray Formed High Toughness Tool Steel in Example 1

[0038]

[0039] Adopt the following preparation steps:

[0040] a, the molten steel of tool steel of the present invention is packed in the spray-forming smelting ladle, and the loaded weight of molten steel is 3.5 tons;

[0041] b. Use graphite electrodes to heat the mold slag covered on the upper surface of the molten steel in the ladle, and argon gas is introduced into the vent holes at the bottom of the ladle to stir the molten steel in the ladle. When the superheat of the molten steel reaches 80°C-150°C, open the molten steel guide pipe ;

[0042] c. Flow the molten steel into the tundish preheated to 1000°C through the diversion tube at the bottom of the ladle, control the size of the inlet of the diversion tube so that the flow rate of ...

Embodiment 2

[0048] This example relates to the verification of the carbide content and particle size, heat treatment hardness, impact toughness, and wear resistance of the spray-formed high-toughness tool steel in Example 1, wherein the carbide content and particle size are analyzed based on tissue images obtained by scanning electron microscopy, and the heat treatment hardness , impact toughness and wear resistance are tested according to GB / T 230.1, GB / T 229 and GB / T 12444-2006 respectively.

[0049] The spray-formed high-toughness tool steels of Examples 1.1 and 1.2 were compared with purchased cast and forged tool steels (alloy A) and powder metallurgy tool steels (alloy B). The results are as follows:

[0050] Table 2.1 Comparison of the composition of Examples 1.1, 1.2 and Alloys A and B

[0051]

[0052] N.A in the above table means not analyzed.

[0053] Table 2.2 Carbide content and particle size comparison between Examples 1.1 and 1.2 and alloys A and B

[0054]

[0055]...

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Abstract

The invention relates to spray-forming high-ductility tool steel, which comprises the following chemical components in percentage by mass: 0.75%-1.18% of C, 0.1%-0.4% of W, not more than 3.0% of Mo, 4.2%-6.5% of Cr, 2.8%-4.8% of V, 0.3%-0.9% of Nb, 0.05%-0.5% of Co, not more than 1.2% of Si, 0.2%-1.0% of Mn, 0.05%-0.4% of N, and the balance of iron and impurities, wherein a carbide of the spray-forming high-ductility tool steel is an MC carbide; and the type of the MC carbide is (V, Nb) (C, N). The prepared spray-forming high-ductility tool steel has excellent overall performance, especially shows high toughness property and abrasive resistance, can meet the requirements of different application fields, and is wide in application.

Description

technical field [0001] The invention relates to a tool steel, in particular to a spray-formed high-toughness tool steel. Background technique [0002] Tool steel should have excellent performance in four aspects including wear resistance, impact toughness, bending strength and hardness. Under normal use conditions, the wear resistance determines the length of service life. The wear resistance of tool steel depends on the hardness of the matrix and the content, shape and particle size distribution of the hard second phase in the steel. Hard second phases in steel include M 6 C.M 2 C.M 23 C 6 , M 7 C 3 And MC, etc., the microhardness of MC carbide is higher than that of other carbides, which can better protect the matrix during operation, thereby reducing the occurrence of wear and improving the service life of tools and dies. The impact toughness of tool steel is an important indicator to reflect the toughness. The existence of coarse carbides in steel causes stress co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/30C22C38/60C22C32/00B22F3/115
Inventor 李小明米永旺邵青立况春江吴立志方玉诚
Owner HEYE SPECIAL STEEL
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