Preparation method of high-strength and high-toughness stainless steel powder for selective laser melting additive manufacturing

A technology of selective laser melting and additive manufacturing, applied in additive manufacturing, processing manufacturing, additive processing, etc., can solve the problems of poor atomization effect, short service life, residue, etc., and achieve environmental protection in the preparation process, improved fluidity, Good atomization effect

Pending Publication Date: 2022-02-08
SHANXI CHEM RES INST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] (1) It is prepared by machining, but because the structure of the internal gas circuit is limited by the processing technology, it can only be split forged, and then assembled together by electric welding. The dimensional accuracy is poor, the material consumption is large, and the service life is short. The atomization effect is poor, and the yield of powder that meets the requirements is relatively low; (2) Investment casting process, the polystyrene core is prepared by

Method used

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  • Preparation method of high-strength and high-toughness stainless steel powder for selective laser melting additive manufacturing
  • Preparation method of high-strength and high-toughness stainless steel powder for selective laser melting additive manufacturing

Examples

Experimental program
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Effect test

Example Embodiment

[0034] Example 1

[0035] Selective Laser Melting one kind of additive manufacturing method for preparing high strength and toughness of the stainless steel powder, comprises the following steps:

[0036] S1: Select line with the metal element component material proportioning design, less than 500Pa vacuum furnace, induction heating vacuum melting of raw materials, the melting temperature of 1300-1800 deg.] C, continue to refine the molten steel after 10-60min of completely clear until the stops take the bath bubble, the charge level to complete clearing of calm, holding 2-10min, molten metal poured into the tundish insulation of the crucible, the crucible bottom of heat flow pipe into the supersonic nozzle aerosolized;

[0037] S2: high pressure into an inert argon gas, through the cavity structure Laval acceleration, supersonic flow is formed, the gas pressure of 3Mpa-8Mpa, the molten metal will fall into the atomization zone of impact crushing, atomized into fine droplets of me...

Example Embodiment

[0045] Example 2

[0046] A method for producing high-strength high tough stainless steel powder, a selection laser melting, manufacturing, is as follows:

[0047] S1: Select the metal element material that meets the component for ingredients, the furnace is smoother, the raw material vacuum induction heates, melting the temperature of 1300-1800 ° C, the steel fluid is completely clear, continue to refine 10-60 min until the molten pool stops Bubble, the furnace is completely cleared to the liquid level, maintaining 2-10 min, the metal fluid is poured into the middle package to protect the crucible, and the insulation crucible bottom guide pipe flows into the supersonic speed angular nozzle;

[0048] S2: Accepted high pressure inert argon, accelerated by the Lavar structure, forming a supersonic gas stream, gas pressure 3 MPa-8 MPa, will impact the metal liquid falling into the atomizing zone, so that it is atomized into a fine metal droplets;

[0049] S3: The droplets are changed...

Example Embodiment

[0056] Example 3

[0057] A method for producing high-strength high tough stainless steel powder, a selection laser melting, manufacturing, is as follows:

[0058] S1: Select the metal element material that meets the component for ingredients, the furnace is smoother, the raw material vacuum induction heates, melting the temperature of 1300-1800 ° C, the steel fluid is completely clear, continue to refine 10-60 min until the molten pool stops Bubble, the furnace is completely cleared to the liquid level, maintaining 2-10 min, the metal fluid is poured into the middle package to protect the crucible, and the insulation crucible bottom guide pipe flows into the supersonic speed angular nozzle;

[0059] S2: Accepted high pressure inert argon, accelerated by the Lavar structure, forming a supersonic gas stream, gas pressure 3 MPa-8 MPa, will impact the metal liquid falling into the atomizing zone, so that it is atomized into a fine metal droplets;

[0060] S3: The droplets are changed...

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Abstract

The invention relates to a preparation method of high-strength and high-toughness stainless steel powder for selective laser melting additive manufacturing. The method comprises the following steps: S1, selecting composite components for burdening, carrying out vacuum induction heating melting, continuously refining till that a molten pool stops bubbling and furnace burden is completely cleared after molten steel is completely cleared, pouring the molten metal into a tundish heat preservation crucible, and flowing into a supersonic gas atomizing nozzle (self-made) through a flow guide pipe; S2, introducing high-pressure inert argon, forming a supersonic airflow, and atomizing the supersonic airflow into fine metal liquid drops; S3, enabling the liquid drops to become particles under surface tension in the air and to be rapidly cooled and solidified into a metal powder, and collecting the metal powder; and S4, screening according to requirements. According to the method, a reasonable component proportion is adopted, a gas atomizing nozzle is prepared from an environment-friendly polystyrene powder, the problem of black smoke is eliminated, complete dewaxing is achieved through a segmented dewaxing method, the service life is long, and the yield of powder meeting the requirement in the prepared metal powder is high; and the powder fluidity is good, and the performance of a test piece prepared through selective laser melting is obviously improved.

Description

technical field [0001] The invention belongs to the field of metal materials, and in particular relates to a preparation method of high-strength and high-toughness stainless steel powder for selective laser melting additive manufacturing. Background technique [0002] At present, metal material parts formed by metal additive manufacturing technology are gradually being used in aerospace, medical equipment, automobile manufacturing and other fields. Typical metal additive manufacturing technologies include laser selective melting, electron beam selective melting, and laser three-dimensional forming. , electron beam fuse deposition, etc. Selective laser melting (SLM) is a laser scanning a layer of metal powder pre-laid by the powder spreader in a chamber filled with inert gas according to a specific path, and the metal melts and forms a metallurgical bond with the previous layer. , so layer upon layer to form the desired entity; the metal powder used in this technology is fine...

Claims

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Application Information

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IPC IPC(8): B22F9/08B22F1/065B22F1/14B22F10/28C22C38/04C22C38/42C22C38/44C22C38/48C22C38/50C22C38/52B29C64/153B33Y10/00B33Y70/00B33Y80/00
CPCB22F9/082C22C38/004C22C38/44C22C38/52C22C38/42C22C38/50C22C38/04C22C38/48C22C38/005B22F10/28B33Y70/00B29C64/153B33Y10/00B33Y80/00B22F2009/0824B22F2009/0848B22F2009/088Y02P10/25
Inventor 郝亚暾孙跃翔李训刚白绍敏姜晓晨光翟一丁张捷马小龙任志刚曹冲李向阳宫涛
Owner SHANXI CHEM RES INST
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