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Heat treatment method of SLM molding gun steel product

A heat treatment method and technology for gun steel, applied in heat treatment furnaces, heat treatment equipment, furnace types, etc., can solve the problems of inability to meet the requirements of artillery design and use, lack of external compressive stress, low plasticity of formed parts, etc., to improve the structure. The effect of uniformity, elimination of anisotropy, and improvement of strength and toughness

Inactive Publication Date: 2020-04-17
XIAN KUNLUN IND GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Gun steel is an important material in weapon materials. The usual criteria for evaluating artillery performance are muzzle energy, shooting accuracy and service life. However, with the continuous improvement of artillery performance in recent years, the above three indicators can no longer meet the requirements of artillery design and The requirements for use, especially for gun steel for small-caliber rapid-fire weapons, require material strength limits;
[0003] In the process of SLM manufacturing gun steel, due to the lack of external compressive stress between the forming layers, the bonding force between the layers is small, so that the plasticity of the formed part is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, a kind of heat treatment method of SLM forming gun steel product, comprises the following steps;

[0029] Step 1. Coat the surface of the gun steel product formed by SLM with a layer of high-temperature resistant and anti-oxidation coating, then put it into a vacuum atmosphere furnace to evacuate to 0.12MPa, and fill it with argon gas with a purity of more than 99%, so that the vacuum rises to 0.012MPa ;

[0030] Step 2. Preheating. The temperature is gradually increased from the initial 0 degrees to 120 degrees, and the temperature is increased by 10 degrees per minute to 120 degrees for 1.5 hours. The whole process is completed in a closed environment;

[0031] Step 2, quenching treatment;

[0032] The first stage: heating at a temperature of 540 degrees for 0.8 hours;

[0033] The second stage: heating at a rate of 2 degrees per minute to 640 degrees for 1.5 hours;

[0034] The third stage: heating at a rate of 3 degrees per minute to 670 degrees for...

Embodiment 2

[0039] Embodiment 2, a kind of heat treatment method of SLM formed gun steel product, comprises the following steps;

[0040] Step 1. Coat the surface of the gun steel product formed by SLM with a layer of high-temperature resistant and anti-oxidation coating, put it into a vacuum atmosphere furnace to evacuate to 0.15MPa, and fill it with argon gas with a purity of more than 99% to raise the vacuum to 0.015MPa ;

[0041] Step 2. Preheating. The temperature is gradually increased from the initial 0 degrees to 120 degrees, and the temperature is increased by 10 degrees per minute to 120 degrees for 1.5 hours. The whole process is completed in a closed environment;

[0042] Step 2, quenching treatment;

[0043] The first stage: heating at a temperature of 600 degrees for 0.7h;

[0044] The second stage: heating at a rate of 2 degrees per minute to 650 degrees for 1.3 hours;

[0045] The third stage: heating at a rate of 3 degrees per minute to 680 degrees for 1.6 hours;

[0...

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Abstract

The invention relates to the technical field of producing and machining of gun steel products, in particular to a heat treatment method of an SLM molding gun steel product. The heat treatment method includes the following steps of firstly, coating the surface of the SLM molding gun steel product with a layer of high-temperature-resistant anti-oxidizing paint, then putting the gun steel product into a vacuum atmosphere furnace, vacuumizing the furnace until the vacuum degree is 0.1-0.2 MPa, and injecting argon with the purity of 99% or above until the vacuum degree is increased to 0.01-0.02 MPa; secondly, performing preheating; thirdly, performing quenching treatment; fourthly, rapidly cooling SLM molding gun steel through an air conditioner; and fifthly, performing tempering treatment, wherein the SLM molding gun steel product is put into the vacuum atmosphere furnace again, the temperature is gradually raised to 540 DEG C from the original 0 DEG C, and the temperature is raised at therate of 30 DEG C per minute. The anisotropy of mechanical performance of the SLM molding gun steel product is eliminated, the toughness is improved, the internal stress is reduced, the comprehensivemechanical performance of the SLM molding gun steel product is strong, meanwhile conventional devices are adopted in the process, the technological process is simple, operation is simple, and batch production can be easily formed.

Description

technical field [0001] The invention relates to the technical field of production and processing of gun steel products, in particular to a heat treatment method for SLM formed gun steel products. Background technique [0002] Gun steel is an important material in weapon materials. The usual criteria for evaluating artillery performance are muzzle energy, shooting accuracy and service life. However, with the continuous improvement of artillery performance in recent years, the above three indicators can no longer meet the requirements of artillery design and The requirements on use, especially for gun steel for small-caliber rapid-fire weapons, are more obvious, and the gun steel for small-caliber rapid-fire weapons requires the limit of material strength; [0003] In the process of SLM manufacturing gun steel, due to the lack of external compressive stress between the formed layers, the interlayer bonding force is small, which makes the plasticity of the formed part low. The...

Claims

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Application Information

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IPC IPC(8): C21D1/18C21D1/70C21D1/773C21D9/00
CPCC21D1/18C21D1/70C21D1/773C21D9/0068
Inventor 王宁郝坤鹏王拓王晨飞
Owner XIAN KUNLUN IND GRP
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