High-hot-strength spray-formed hot work die steel and preparation method thereof

A hot work die steel and spray forming technology, which is applied in the fields of high thermal strength spray forming hot work die steel new material, subsequent hot working and heat treatment, and spray forming preparation fields, can solve the problems of insufficient use of spray forming and coarse structure, etc. Achieve good thermal stability and tempering resistance, high impact toughness, and improve the effect of hot work die life

Active Publication Date: 2015-01-14
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there are still two problems in the preparation of hot work die steel by spray forming technology: (1) The mold is directly formed by spray forming technology, since subsequent deformation treatment cannot be adopted to make it densified, so there must be enough in the process of spray deposition The liquid phase is...

Method used

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  • High-hot-strength spray-formed hot work die steel and preparation method thereof
  • High-hot-strength spray-formed hot work die steel and preparation method thereof
  • High-hot-strength spray-formed hot work die steel and preparation method thereof

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Embodiment 1

[0025] The high thermal strength hot work die steel of the present invention realizes high performance by optimizing the compatibility of alloy components and adjusting the spray forming process. The preparation method is as follows: (1) Preparing hot-working die steel deposition blanks by spray forming technology: smelting in induction furnaces under vacuum or non-vacuum until the chemical composition range meets the requirements, keeping the temperature for 10-20min, and superheating the molten steel at 100-200°C , and then poured into a tundish with a temperature above 1000°C. The molten steel is atomized by N2. The atomization system adopts non-restricted primary and secondary two-stage annular hole atomization nozzles. The deposition distance is 400-500mm, and the deposition substrate is stainless steel. As the spray deposition process proceeds, the substrate is pulled down at a constant speed, and finally a columnar deposition blank with a diameter of 120 mm and a height...

Embodiment 2

[0043] The preparation method, thermal processing and heat treatment process of the inventive steel described in this example are the same as in Example 1, and the commercial H13 steel in Example 1 is still used as the comparison steel.

[0044] The chemical compositions of steel of the present invention and contrast steel are shown in Table 5

[0045] Under the condition that the hardness at room temperature is similar to that of the comparison steel, the high-temperature tensile performance of the steel of the invention is obviously better than that of the comparison steel, and the impact toughness is also higher than that of the comparison steel. The specific performance data comparison is shown in Table 6.

[0046] The temper resistance and thermal stability of the inventive steel are significantly better than those of the comparative steel. For specific performance data comparison, see Table 7 and Table 8.

[0047] Table 5: Chemical composition of steel of the present i...

Embodiment 3

[0056] The preparation method, thermal processing and heat treatment process of the inventive steel described in this example are the same as in Example 1, and the commercial H13 steel in Example 1 is still used as the comparison steel.

[0057] The chemical compositions of steel of the present invention and contrast steel are shown in Table 9

[0058] Under the condition that the hardness at room temperature is similar to that of the comparison steel, the high-temperature tensile performance of the steel of the invention is obviously better than that of the comparison steel, and the impact toughness is also higher than that of the comparison steel. The specific performance data comparison is shown in Table 10.

[0059] The temper resistance and thermal stability of the inventive steel are significantly better than those of the comparative steel. For specific performance data comparison, see Table 11 and Table 12.

[0060] Table 9: Chemical composition of steel of the presen...

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Abstract

The invention discloses high-hot-strength spray-formed hot work die steel and a preparation method thereof, belonging to the technical field of hot work die steel. The die steel comprises the following components of 0.3-0.5 of C, 3.0-5.0 of Cr, 1.5-3.5 of Mo, 0.4-1.0 of W, 0.3-0.8 of Si, 0.3-0.5 of Mn, 0.8-1.5 of V, 0.03-0.10 of Nb, less than or equal to 0.03 of S, less than or equal to 0.03 of P and the balance of Fe. The preparation method comprises the process routes of spray forming, hot forging and heat treatment; different comprehensive mechanical properties are obtained by adjusting the quenching and tempering temperatures in a way of controlling process parameters and hot forging temperature in the spray forming process, so that the requirements of different working conditions are met. The compatibility of alloy elements is reasonably optimized according to the characteristic of a spray forming process and the special requirement of the hot work die steel for high-temperature performance, so that the high-hot-strength spray-formed hot work die steel has favorable high-temperature performance, good heat stability and tempering resistance, relatively high impact toughness and excellent comprehensive performance, and the service life of the hot work die steel is greatly prolonged.

Description

technical field [0001] The invention belongs to the technical field of hot work die steel, and specifically aims at inventing a new high-heat-strength spray-formed hot-work die steel material according to the characteristics of the spray forming process, as well as the technology and method of spray forming preparation, subsequent thermal processing and heat treatment. Background technique [0002] Hot working dies are mainly used for thermoforming various mechanical parts in industry. The most popular hot forming methods include forging, extrusion and casting of non-ferrous alloys. During the hot forming process, the mold is subjected to different mechanical loads and drastic changes in temperature. The combination of mechanical stress, thermal stress and chemical factors shows that the mold The performance of materials has extremely stringent requirements. Hot work die steel is the most commonly used material for making hot work dies. Among them, H13 steel is a kind of ho...

Claims

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Application Information

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IPC IPC(8): C22C38/26C21D8/00B22D11/06
CPCB22D11/06C21D8/00C22C38/02C22C38/04C22C38/12C22C38/18
Inventor 黄进峰张金祥张济山王和斌卢林崔华
Owner UNIV OF SCI & TECH BEIJING
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