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Maraging steel based on SLM (Selective Laser Melting) molded part and preparation method thereof

A technology of maraging steel and forming parts, applied in the field of steel materials, can solve the problems of poor performance of aging steel, small application range, unable to meet the needs of industrial design, etc., and achieve the effect of high strength and good rigidity

Inactive Publication Date: 2019-09-27
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies in the above-mentioned prior art, the present invention provides a maraging steel based on SLM formed parts and a preparation method thereof, so as to solve the poor performance of maraging steel based on SLM formed parts in the prior art, and the scope of application Minor technical problems that cannot meet the needs of industrial design

Method used

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  • Maraging steel based on SLM (Selective Laser Melting) molded part and preparation method thereof
  • Maraging steel based on SLM (Selective Laser Melting) molded part and preparation method thereof
  • Maraging steel based on SLM (Selective Laser Melting) molded part and preparation method thereof

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preparation example Construction

[0036] The invention provides a method for preparing maraging steel based on SLM formed parts, comprising the following steps:

[0037] Step 1, using maraging steel powder as a raw material, adopting SLM molding to obtain an SLM molded part;

[0038]Step 2, carrying out surface treatment to the SLM molding in step 1;

[0039] Step 3, performing solution treatment, aging treatment or direct aging treatment on the surface-treated SLM formed part in step 2 to obtain the maraging steel of the selected area laser melting formed part.

Embodiment 1

[0041] A method for preparing maraging steel based on SLM formed parts, comprising the following steps:

[0042] Step 1, using maraging steel powder as a raw material, adopting SLM molding to obtain an SLM molded part;

[0043] When using SLM molding technology to prepare SLM molded parts, add a sufficient amount of maraging steel powder into the powder tank before printing starts; because the commonly used 3D printers have the same size as the molding tank and the powder tank, adding martensite The amount of aging steel powder is not less than twice the height of the molded part; before printing, pass an inert protective gas into the printing chamber to ensure that the oxygen content in the printing chamber is lower than 0.05%, and then start printing; the entire printing process Among them, the flow rate of the inert protective gas is greater than 1.2Lpm; the specific printing parameters are: the laser scanning speed is 400-600mm / s, the laser power is 160-180W; the thickness...

Embodiment 2

[0055] The preparation principle of embodiment 2 is basically the same as that of embodiment 1, except that in step 3 of embodiment 2, the aging treatment is carried out to the surface-treated SLM formed part to obtain the maraging steel of the SLM formed part; the aging treatment is specifically : In a vacuum environment or a protective gas atmosphere, the surface-treated SLM molded parts are heated to 900-920°C within 1h-2h; and kept at 900-920°C for 2-2.5h; then 10-15 ℃ / min to cool down to 540-560 ℃, and keep warm for 4-6h, then air-cooled to room temperature.

[0056] The microhardness of the maraging steel of the SLM formed part obtained in embodiment 2 is 670-712HV, and the tensile strength is 1022-1200Mpa; The maraging steel of SLM formed part has higher microhardness and tensile strength. Tensile strength, with better engineering application potential.

[0057] as attached figure 2 As shown, in Example 2, for aging treatment + final air cooling, when the aging treat...

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Abstract

The invention discloses maraging steel based on an SLM (Selective Laser Melting) molded part and a preparation method thereof. The preparation method comprises the following steps of: firstly, carrying out SLM molding on the powder of maraging steel used as a raw material to obtain the SLM molded part; then, carrying out surface treatment on the SLM molded part to obtain the compact SLM molded part; and finally carrying out solid solution treatment, aging treatment or direct aging treatment on the compact SLM molded part to obtain the maraging steel based on the SLM molded part. The SLM molded part is subjected to heat treatment by adopting the solid solution treatment, aging treatment or direct aging treatment, so that the mechanical strength and toughness of the SLM molded part are effectively improved; the range of application of the SLM molded part is expanded; the industrial design and manufacturing requirements are satisfied better; and the maraging steel based on the SLM molded part has the microhardness of 400-430HV and the tensile strength of 900-1000Mpa.

Description

technical field [0001] The invention belongs to the technical field of steel materials, and in particular relates to a maraging steel based on an SLM formed part and a preparation method thereof. Background technique [0002] Maraging steel is a kind of ultra-high-strength, high-toughness steel, which has been widely used in many fields such as aerospace, precision gears and precision molds since its inception. The reason for the high strength of maraging steel is the nano-sized Ni 3 (Mo, Ti) and Fe 2 Mo intermetallic particles precipitated during heat treatment. The above-mentioned particles will significantly enhance the microhardness and strength by inhibiting the mobility of dislocations. Maraging steel has many advantages over other ultra-high-strength steels, such as easy manufacturing and processing, and excellent welding performance. Among all the materials developed today, it is the steel with the highest strength and toughness. [0003] Selective laser melting ...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F3/24B33Y10/00B33Y70/00C22C38/06C22C38/08C22C38/10C22C38/12C22C38/14
CPCB22F3/24B33Y70/00B33Y10/00C22C38/105C22C38/12C22C38/14C22C38/06B22F2003/247B22F2003/248B22F2998/10B22F10/00B22F10/36B22F10/32B22F10/66B22F10/366B22F10/28B22F10/64Y02P10/25
Inventor 杨立军郑航李俊
Owner SHAANXI UNIV OF SCI & TECH
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