High-strength stainless steel powder for SLM, preparation method and printing process of high-strength stainless steel powder

A stainless steel, high-strength technology, applied in the direction of additive processing, metal processing equipment, transportation and packaging, etc., can solve the problems that cannot meet the high strength, high plasticity and toughness of SLM printed stainless steel parts, high gas content and high oxygen content, and achieve improved mechanics and Effects of processability, strength improvement, and yield improvement

Active Publication Date: 2022-04-26
CENT IRON & STEEL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above analysis, the present invention aims to provide a high-strength stainless steel powder for SLM, a preparation method and a printing process thereof, so as to solve the problems in the existing vacuum atomized powder. The gas content, especially the oxygen content, is too high to meet the requirements of high strength, high plasticity and toughness of SLM printed stainless steel parts.

Method used

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  • High-strength stainless steel powder for SLM, preparation method and printing process of high-strength stainless steel powder
  • High-strength stainless steel powder for SLM, preparation method and printing process of high-strength stainless steel powder
  • High-strength stainless steel powder for SLM, preparation method and printing process of high-strength stainless steel powder

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preparation example Construction

[0043] The present invention also provides a method for preparing high-strength stainless steel powder for SLM, comprising the following steps:

[0044] Step 1, adopting the method of vacuum induction melting + vacuum consumable remelting to prepare master alloy;

[0045] Specifically, step 1 includes: using pure carbon, silicon, manganese, chromium, nickel, molybdenum, and aluminum to prepare a master alloy by vacuum induction melting and vacuum self-consumption remelting, the chemical composition of the master alloy is: C≤0.04% , Si≤0.05%, Mn≤0.05%, Cr: 12.5~13.5%, Ni: 7.5~8.5%, Mo: 2.0~2.5%, Al: 1.0~1.15%, P≤0.005%, S≤0.002%, O ≤0.001%, N≤0.002%, and the balance is Fe and unavoidable impurities. Then the master alloy is forged into a 30×40×500 mm alloy block, and the oxide skin and dirt on the surface of the alloy block are removed by a grinder, and then used for gas atomization powder production.

[0046] Step 2. Vacuum smelting gas atomization milling (VIGA);

[0047] ...

Embodiment 1

[0073] 1. Preparation of stainless steel powder:

[0074] Step 1, adopting the method of vacuum induction melting + vacuum consumable remelting to prepare master alloy;

[0075] The master alloy is prepared by vacuum induction melting and vacuum consumable remelting with pure carbon, silicon, manganese, chromium, nickel, molybdenum and aluminum. The master alloy is forged into a 30×40×500mm alloy block, and the oxide skin and dirt on the surface of the alloy block are removed by a grinder, and then used for gas atomization powder production.

[0076] Step 2, Vacuum Air Atomization Milling (VIGA);

[0077] Weigh 30kg master alloy bulk material and place it in the smelting furnace of the vacuum air atomization pulverization equipment, and evacuate the atomization chamber and the smelting chamber to vacuum. During smelting, the power of the induction furnace is 1400kW, until the base metal is completely melted into molten steel, and block rare earth Ce is added to the molten st...

Embodiment 2

[0086] 1. Preparation of stainless steel powder:

[0087] Step 1, adopting the method of vacuum induction melting + vacuum consumable remelting to prepare master alloy;

[0088] The master alloy is prepared by vacuum induction melting and vacuum consumable remelting with pure carbon, silicon, manganese, chromium, nickel, molybdenum and aluminum. The master alloy is forged into a 30×40×500mm alloy block, and the oxide skin and dirt on the surface of the alloy block are removed by a grinder, and then used for gas atomization powder production.

[0089] Step 2, Vacuum Air Atomization Milling (VIGA);

[0090] Weigh 30kg master alloy bulk material and place it in the smelting furnace of the vacuum air atomization pulverization equipment, and evacuate the atomization chamber and the smelting chamber to vacuum. During smelting, the power of the induction furnace is 1400kW, until the base metal is completely melted into molten steel, and block rare earth Ce is added to the molten st...

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Abstract

The invention discloses high-strength stainless steel powder for SLM, a preparation method and a printing process thereof, belongs to the field of metal materials for additive manufacturing, relates to the high-strength stainless steel powder for SLM, the preparation method and the printing process thereof, and solves the problems that the gas content, especially the oxygen content, in existing vacuum gas atomization powder is too high; and the requirements for high strength and high plasticity and toughness of the SLM printed stainless steel part cannot be met. The high-strength stainless steel powder for SLM comprises the following chemical components in percentage by mass: less than or equal to 0.04% of C, less than or equal to 0.05% of Si, less than or equal to 0.05% of Mn, 12.5-13.5% of Cr, 7.5-8.5% of Ni, 2.0-2.5% of Mo, 1.0-1.15% of Al, 0.02-0.08% of Ce, less than or equal to 0.005% of P, less than or equal to 0.002% of S, less than or equal to 0.030% of O, less than or equal to 0.003% of N and the balance of Fe and inevitable impurities. The particle size range is 15-53 [mu] m. The density of the final SLM printed part reaches 99.8% or above, the tensile strength is larger than or equal to 1400 MPa, the yield strength is larger than or equal to 1360 MPa, the ductility is larger than or equal to 13%, the percentage reduction of area is larger than or equal to 57%, the U-shaped impact energy is larger than or equal to 100 J, and the use requirements for high strength and high plasticity and toughness of the 3D printed stainless steel part are met.

Description

technical field [0001] The invention belongs to the field of metal materials for additive manufacturing, and relates to a high-strength stainless steel powder for SLM, a preparation method and a printing process thereof. Background technique [0002] High-strength stainless steel is widely used in aerospace, machinery manufacturing, offshore platforms and other fields due to its excellent strength, excellent impact resistance and corrosion resistance, good fracture toughness and machinability, etc. With the continuous expansion of its application fields, the complexity of the required parts continues to increase, and the traditional preparation process is difficult to meet the preparation needs. The selected laser melting technology (SLM) in 3D printing technology is the most important research and development direction of metal 3D printing technology at home and abroad because it can directly form complex and precise parts. [0003] At present, most of the metal powder con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/00B22F1/14B22F9/08B33Y70/00C22C38/00C22C38/02C22C38/04C22C38/06C22C38/44
CPCB22F9/082C22C38/02C22C38/04C22C38/44C22C38/06C22C38/005C22C38/001B33Y70/00Y02P10/25
Inventor 王长军梁剑雄刘振宝刘雨杨志勇孙永庆刘畅
Owner CENT IRON & STEEL RES INST
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