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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 finish cooling throughout the component, and as it cools from the melting point of the material, the newly deposited area shrinks, creating uneven expansion and contraction in different areas of the component, which in turn leads to formation of Tensile residual stresses and deformations, which can impair structural integrity and accelerate failure of metallic components in subsequent use

Method used

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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

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Embodiment 1

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

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

[0034] From figure 1 It can be seen that the martensitic transformation initiation temperature ranges from 25 to 800°C, and the martensite transformation begins at close to 220°C (martensite transformation initiation temperature, Ms), and the volume expansion reaches the maximum at about 50°C. It means that cooling to this temperature has th...

Embodiment 2

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

[0042] During the cooling process of martensitic steel, high-temperature austenite transforms into low-temperature phases, such as ferrite, bainite, and martensite, or these low-temperature phases of ferrite, bainite, and martensite are in steel mixture, and leads to volume expansion, which can counteract high tensile residual stress and deformation; the effectiveness of counteracting high tensile residual stress and deformation depends on the degree of volume expansion and the temperature range in which the allotropic phase transition occurs, Martens Formation of t...

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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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