Metal additive manufacturing method and additive manufacturing material

A metal additive and manufacturing method technology, applied in the field of 3D printing, can solve problems such as uneven expansion and contraction, accelerated metal component failure, damage to structural integrity, etc., to reduce deformation, long service life, and reduce tensile residuals. effect of stress

Pending Publication Date: 2020-10-16
NANJING XING CHENG INST OF SMART MFG CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When metal components are manufactured by the metal additive manufacturing method, each layer of the metal component is formed by depositing metal wire or powder raw materials. During the deposition process, the metal wire or powder raw materials will undergo four stages of heating, melting, solidification and cooling in sequence; The newly deposited layer is usually the last to f

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  • Metal additive manufacturing method and additive manufacturing material
  • Metal additive manufacturing method and additive manufacturing material
  • Metal additive manufacturing method and additive manufacturing material

Examples

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Example Embodiment

[0031] Example 1

[0032] This embodiment provides a metal additive manufacturing material, which has a volume expansion characteristic during a cooling process. Specifically, the metal additive manufacturing material of this embodiment is martensitic steel, including the following percentages: Ni 6-20%, Cr 5-16%, Mn <20%, Cu <10%, Mo 0-2%, Si <2%, C <0.4, the balance is Fe.

[0033] The martensitic steel of this embodiment has volume expansion characteristics in the allotropic transformation, and its expansion curve is as follows figure 1 As shown, figure 1 The expansion curve in is measured by the expansion method.

[0034] From figure 1 It can be seen that the martensite transformation start temperature range is 25-800°C, the martensite transformation starts at approximately 220°C (martensite transformation start temperature, Ms), and the volume expansion reaches the maximum at about 50°C. It means that cooling to this temperature has the best offsetting effect on tensile residua...

Example Embodiment

[0040] Example 2

[0041] In order to reduce the tensile residual stress or / and deformation generated in the additive manufacturing process, this embodiment provides a metal additive manufacturing method. This embodiment selects materials with volume expansion characteristics during the cooling process for additive manufacturing. Specifically, this embodiment selects martensitic steel for additive manufacturing.

[0042] During the cooling process of martensitic steel, high-temperature austenite will transform into low-temperature phases, such as ferrite, bainite, martensite, or ferrite, bainite, martensite, these low-temperature phases in the steel The volume expansion can offset high tensile residual stress and deformation; the effectiveness of offsetting high tensile residual stress and deformation depends on the degree of volume expansion and the temperature range in which allotropic phase transformation occurs, Markov The formation of the body, especially when it is close to ...

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Abstract

The invention provides a metal additive manufacturing method and a metal additive manufacturing material, and belongs to the 3D printing technology. The metal additive manufacturing method is characterized in that the metal additive manufacturing material with the volume expansion characteristic in the cooling process is adopted for additive manufacturing, so that tensile residual stress or/and deformation generated in the additive manufacturing process is/are reduced. According to the method, a metal component is manufactured by using the metal additive manufacturing material with the volumeexpansion characteristic in the cooling process, tensile residual stress can be reduced, even compressive residual stress is generated in the metal component, and deformation in the metal component can be controlled, so that the manufactured metal component has longer service life.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and specifically relates to a metal additive manufacturing method, and in addition, the invention also relates to a metal additive manufacturing material. Background technique [0002] Additive manufacturing, commonly known as 3D printing, is based on digital model files, through software and numerical control system, special metal materials, non-metal materials and medical biological materials are layer by layer according to extrusion, sintering, melting, light curing, spraying, etc. Stacking, a manufacturing technique that produces physical objects. Additive manufacturing technology solves the problem of difficult forming of many complex structural parts, and can reduce the processing steps and shorten the processing cycle, so it has received widespread attention. [0003] Metal additive manufacturing is a highly automated processing method that uses metal materials to accumulate layer by ...

Claims

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Application Information

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IPC IPC(8): B22F3/00B33Y10/00B33Y70/00C22C38/02C22C38/42C22C38/44C22C38/58
CPCB33Y10/00B33Y70/00C22C38/58C22C38/42C22C38/44C22C38/02
Inventor 于兴华林子栋
Owner NANJING XING CHENG INST OF SMART MFG CO LTD
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