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Laser additive manufacturing shear type phase change crack resistance method

A laser additive and additive manufacturing technology, applied in the directions of additive manufacturing, additive processing, and process efficiency improvement, which can solve problems such as residual tensile stress and related cracks in 3D printing alloys

Active Publication Date: 2020-05-15
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although various methods have been used to mitigate the formation of cracks in AM metal parts, the problem of residual tensile stress and associated cracking in 3D printed alloys is still prevalent

Method used

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  • Laser additive manufacturing shear type phase change crack resistance method
  • Laser additive manufacturing shear type phase change crack resistance method
  • Laser additive manufacturing shear type phase change crack resistance method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] (1) SLM printing single-phase FCC high-entropy alloy, single-phase FCC high-entropy alloy components are: Fe 20at.%, Mn20at.%, Co 20at.%, Cr 20at.%, Ni 20at.%.;

[0028] Additive manufacturing of high-entropy alloy powder with the above ingredients, the preparation method is gas atomization method, firstly, the prepared metal block is vacuum smelted, and then an inert gas is used for atomization and powder making, and the inert gas used is argon . The specific parameters for melting are: melting temperature: 1550°C; pressure inside the melting furnace is 0.5MPa; atomization pressure is 7MPa. The atomized metal powder is sieved and classified, and the metal powder with a mesh number of 200-325 is used as the raw material powder for additive manufacturing.

[0029] (2) Before additive manufacturing, the metal powder was dried in a vacuum oven for 12 hours at a drying temperature of 120°C.

[0030](3) Perform additive manufacturing printing on the above-mentioned dried h...

Embodiment 2

[0034] (1) SLM printing single-phase FCC high-entropy alloy, single-phase FCC high-entropy alloy components are: Fe 25at.%, Co25at.%, Cr 25at.%, Ni 25at.%.;

[0035] Additive manufacturing of high-entropy alloy powder with the above ingredients, the preparation method is gas atomization method, firstly, the prepared metal block is vacuum smelted, and then an inert gas is used for atomization and powder making, and the inert gas used is argon . The specific parameters for melting are: melting temperature: 1550°C; pressure inside the melting furnace is 0.5MPa; atomization pressure is 7MPa. The atomized metal powder is sieved and classified, and the metal powder with a mesh number of 200-325 is used as the raw material powder for additive manufacturing.

[0036] (2) Before additive manufacturing, the metal powder was dried in a vacuum oven for 12 hours at a drying temperature of 120°C.

[0037] (3) Perform additive manufacturing printing on the above-mentioned dried high-entrop...

Embodiment 3

[0040] (1) SLM printing single-phase FCC high-entropy alloy, the single-phase FCC high-entropy alloy components are: Co 33at.%, Cr33at.%, Ni 33at.%.

[0041] Additive manufacturing of high-entropy alloy powder with the above ingredients, the preparation method is gas atomization method, firstly, the prepared metal block is vacuum smelted, and then an inert gas is used for atomization and powder making, and the inert gas used is argon . The specific parameters for melting are: melting temperature: 1550°C; pressure inside the melting furnace is 0.5MPa; atomization pressure is 7MPa. The atomized metal powder is sieved and classified, and the metal powder with a mesh number of 200-325 is used as the raw material powder for additive manufacturing.

[0042] (2) Before additive manufacturing, the metal powder was dried in a vacuum oven for 12 hours at a drying temperature of 120°C.

[0043] (3) Perform additive manufacturing printing on the above dried high-entropy alloy powder. Th...

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Abstract

The invention discloses a laser additive manufacturing shear type phase change crack resistance method. The method comprises the steps of adopting a laser additive manufacturing technology and takinghigh-entropy alloy powder with FCC-HCP martensite phase change as additive manufacturing special powder; drying the metal powder in a vacuum drying oven for 12 hours at a drying temperature of 120 DEGC; and carrying out additive manufacturing and printing on the dried high-entropy alloy powder, wherein the printing parameters are as follows: the laser power is 400 W, the scanning speed is 800-1600 mm / s, the scanning distance is 0.09 mm, the powder laying thickness is 0.03 mm, and the substrate preheating temperature is 100 DEG C. The problem of metallurgical defects such as thermal crack deformation and the like are caused by high temperature and high stress gradient in a molten pool in the traditional laser additive manufacturing process is solved. On the basis of the study, the idea ofsuppressing hot cracks in additive manufacturing alloys by stress-induced martensitic transformation is extended to other additive manufacturing alloy systems, and a new method is provided for additive manufacturing of crack-free alloys.

Description

technical field [0001] The invention belongs to the technical field of laser additive manufacturing, and in particular relates to a method for laser additive manufacturing shear type phase change crack resistance. Background technique [0002] Selective Laser Melting (SLM) is an effective way to form complex precision parts of High Entropy Alloys (HEAs), and has received widespread attention in academia and industry. Compared with traditional casting and forging, SLM technology has many advantages that traditional methods do not have, such as the ability to prepare highly complex workpieces without molds during the preparation process. Therefore, laser additive manufacturing has irreplaceable advantages in terms of grain refinement and component shape complexity. However, laser additive manufacturing is not a simple transformation of casting and rolling into additive manufacturing. Due to the high temperature and stress gradient in the HEAs molten pool formed by SLM, it is ...

Claims

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Application Information

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IPC IPC(8): B22F3/105B22F9/08B22F1/00C22C38/38C22C38/30C22C30/00B33Y10/00B33Y70/00
CPCB22F1/0003B22F9/082C22C38/38C22C38/30C22C30/00B33Y10/00B33Y70/00B22F10/00B22F10/36B22F10/366B22F10/28Y02P10/25
Inventor 李瑞迪牛朋达袁铁锤李志明
Owner CENT SOUTH UNIV
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