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17-4PH raw material powder for laser additive manufacturing, preparation method of 17-4PH raw material powder and preparation method of stainless steel of 17-4PH raw material powder

A laser additive and powder preparation technology, applied in additive manufacturing, additive processing, metal processing equipment, etc., can solve the problems of unsatisfactory plasticity and toughness, deposition anisotropy, lower than the level of forgings, etc., to improve the hardenability , Improve the internal organization, enhance the effect of corrosion resistance

Pending Publication Date: 2022-07-22
BEIJING POWER MACHINERY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the technical limitations of laser selective melting itself, defects such as small-sized voids and cracks are often randomly distributed inside the product; the high cooling rate in the additive manufacturing process leads to the formation of a strong temperature gradient, resulting in a serious anisotropy in the deposited state. Anisotropy and high residual stress
In addition, although the 17-4PH stainless steel prepared by laser selective melting technology has better performance in terms of tensile strength, the performance in plasticity and toughness is not satisfactory, which is obviously lower than that of forgings.

Method used

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  • 17-4PH raw material powder for laser additive manufacturing, preparation method of 17-4PH raw material powder and preparation method of stainless steel of 17-4PH raw material powder
  • 17-4PH raw material powder for laser additive manufacturing, preparation method of 17-4PH raw material powder and preparation method of stainless steel of 17-4PH raw material powder
  • 17-4PH raw material powder for laser additive manufacturing, preparation method of 17-4PH raw material powder and preparation method of stainless steel of 17-4PH raw material powder

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Experimental program
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specific Embodiment approach 1

[0032] A method for preparing 17-4PH stainless steel from 17-4PH raw material powder for laser additive manufacturing, comprising the following steps:

[0033] Step 1. Pre-treatment of the printing substrate, ready for use;

[0034] Step 2. Use laser selective melting for printing: The printing process uses argon gas as the protective gas, controls the thickness of the powder to be 40-41μm, the scanning speed is 600-1200mm / s, the laser power range is 150-330W, and the scanning spacing is 0.8- 0.12mm;

[0035] Step 3, hot isostatic pressing;

[0036] Step 4, solution heat treatment;

[0037] Step 5, aging heat treatment.

[0038] In the method for preparing 17-4PH stainless steel from 17-4PH raw material powder for laser additive manufacturing described in this embodiment, the printing substrate in step 1 is 316L stainless steel. Before printing, the surface of the printing substrate is derusted, degreasing, and polished by machining.

[0039] In the method for preparing 17-...

specific Embodiment approach 2

[0064] A 17-4PH raw material powder for laser additive manufacturing, the composition of the 17-4PH raw material powder for laser additive manufacturing is composed of:

[0065] C is 0.05-0.08wt%, Cr is 16.5-18.5wt%, Cu is 3.5-5.5wt%, Nb is 0.25-0.5wt%, Ni is 4.5-6.5wt%, Mn is 0.05-0.75wt%, Ti is 0.02-0.15wt%, Al is 0.005-0.03wt%, Si is 0.62-0.78wt%, Mo is 0.75-3wt%, Co is 0.05-0.1wt%, O is 0.02-0.05wt%, B is 0.02-0.05 wt%, S is 0.002-0.005wt%, P is 0.002-0.01wt%, and the rest is Fe.

[0066] The 17-4PH raw material powder for laser additive manufacturing described in this embodiment improves the hardenability of martensitic stainless steel by appropriately increasing the C content and adding a small amount of B element, and reduces the residual austenite content; Cr element content can improve the corrosion resistance of 17-4PH; increasing Cu element content promotes the formation of precipitation phase in supersaturated solid solution during heat treatment, and the combined...

specific Embodiment approach 3

[0067] According to the 17-4PH raw material powder for laser additive manufacturing according to the second embodiment, the composition of the 17-4PH raw material powder for laser additive manufacturing is composed of the following by mass fraction:

[0068] C is 0.065-0.078wt%, Cr is 17.2-18.0wt%, Cu is 4.2-5.1wt%, Nb is 0.3-0.4wt%, Ni is 5.4-6.0wt%, Mn is 0.28-0.55wt%, Ti is 0.08-0.12wt%, Al is 0.015-0.02wt%, Si is 0.66-0.71wt%, Mo is 1.3-2.45wt%, Co is 0.068-0.88wt%, O is 0.02-0.03wt%, B is 0.035- 0.05wt%, S is 0.002-0.003wt%, P is 0.002-0.005wt%, and the rest is Fe.

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Abstract

The invention discloses 17-4PH raw material powder for laser additive manufacturing, a preparation method of the 17-4PH raw material powder and a preparation method of stainless steel of the 17-4PH raw material powder, and belongs to the technical field of additive manufacturing metal materials. The technical problem to be solved by the invention is to optimize the alloy preparation process. The raw material powder disclosed by the invention is prepared from the following components in percentage by mass: 0.065 to 0.078 percent of C, 17.2 to 18.0 percent of Cr, 4.2 to 5.1 percent of Cu, 0.3 to 0.4 percent of Nb, 5.4 to 6.0 percent of Ni, 0.28 to 0.55 percent of Mn, 0.08 to 0.12 percent of Ti, 0.015 to 0.02 percent of Al, 0.66 to 0.71 percent of Si, 1.3 to 2.45 percent of Mo, 0.068 to 0.88 percent of Co and the like. Internal defects are reduced by improving structural components of the stainless steel, and structural uniform components are improved through a proper heat treatment process, so that the material obtains strong plasticity matching.

Description

technical field [0001] The invention belongs to the technical field of additive manufacturing of metal materials, and in particular relates to a 17-4PH raw material powder for laser additive manufacturing, a preparation method thereof, and a preparation method of stainless steel. Background technique [0002] In recent years, laser additive manufacturing technology has received extensive attention in the production field due to its unique technical advantages. Aiming at the characteristics of small batches, high requirements, and frequent changes to plans in the trial production stage of aerospace vehicle parts, additive manufacturing can provide integrated production, solve the problems of large number of parts and high assembly accuracy requirements, and mold-free production can meet the needs of rapid design changes. manufacture. The combination of integrated structural design and additive manufacturing technology effectively reduces production costs and manufacturing cy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/42C22C38/48C22C38/50C22C38/06C22C38/02C22C38/44C22C38/52C22C38/54C22C38/04B22F1/065B22F9/14B22F9/08B22F10/28B22F10/64B22F3/15B33Y70/00B33Y10/00B33Y40/20
CPCC22C38/42C22C38/48C22C38/50C22C38/06C22C38/02C22C38/44C22C38/52C22C38/54C22C38/04B22F9/14B22F9/082B22F10/28B22F10/64B22F3/15B33Y70/00B33Y10/00B33Y40/20Y02P10/25
Inventor 王亚军马瑞薛丽男张群谢勇孙逸铭黄蓉蓉檀财旺宋晓国
Owner BEIJING POWER MACHINERY INST
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