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A method for eliminating cracks in metal material additive manufacturing and improving mechanical properties

A metal material and additive manufacturing technology, applied in the field of additive manufacturing, can solve the problems of no public reports of research results, etc., and achieve the effects of eliminating internal residual stress, uniform structure, and prolonging sintering time

Active Publication Date: 2019-07-26
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there are no public reports of relevant research results at home and abroad

Method used

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  • A method for eliminating cracks in metal material additive manufacturing and improving mechanical properties
  • A method for eliminating cracks in metal material additive manufacturing and improving mechanical properties

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] (1) Using SLM to form Renè104 nickel-based superalloy, the size is a cylinder with a diameter of 40mm and a height of 15mm, and the density is 98.91%, see figure 1 . From figure 1 It can be seen that there are a large number of cracks inside the alloy.

[0032] (2) Stress-relief annealing is performed on the Renè 104 nickel-based superalloy formed by the above SLM: the temperature is 420°C (the heating rate is 10°C / min), the holding time is 90min, and the furnace is cooled.

[0033] (3) Then spark plasma sintering (SPS): pressure 45MPa, temperature 1020°C, holding time 15min. The heating rate of spark plasma sintering was 60°C / min, and the cooling rate was 60°C / min.

[0034] The compactness of the molded part after the above process is 99.52%. From figure 2 It can be seen that after the above-mentioned process treatment, the internal cracks of the nickel-based superalloy formed by SLM are basically eliminated.

[0035] The room temperature tensile strength of the...

Embodiment 2

[0051] (1) SLM is used to form Ti6Al4V alloy, the size is a cylinder with a diameter of 40mm and a height of 15mm, and the density is 99.5%.

[0052] (2) Stress-relief annealing is carried out on the above-mentioned Ti6Al4V alloy formed by SLM: the temperature is 300°C (heating rate is 10°C / min), the holding time is 90min, and it is cooled with the furnace.

[0053] (3) Spark plasma sintering (SPS) is carried out again: the pressure is 45Mpa, the temperature is 750°C, and the holding time is 10min. The heating rate of spark plasma sintering was 60°C / min, and the cooling rate was 60°C / min.

[0054] The internal cracks of the formed parts treated by the above process are basically eliminated, the density reaches 99.9%, and the mechanical properties are excellent.

Embodiment 3

[0056] (1) AlSi10Mg alloy is formed by LENS, the size is a cylinder with a diameter of 40mm and a height of 15mm, and the density is 99.1%.

[0057] (2) For the AlSi10Mg alloy formed by the above-mentioned LENS, perform stress relief annealing: the temperature is 150°C (heating rate is 10°C / min), the holding time is 90min, and it is cooled with the furnace.

[0058] (3) Spark plasma sintering (SPS) is carried out again: the pressure is 35Mpa, the temperature is 470°C, and the holding time is 10min. The heating rate of spark plasma sintering was 60°C / min, and the cooling rate was 60°C / min.

[0059] The internal cracks of the formed parts treated by the above process are basically eliminated, the density is 99.8%, and the mechanical properties are excellent.

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Abstract

The invention provides a method for eliminating metal material additive manufacturing cracks and improving mechanical properties, and belongs to the technical field of additive manufacturing. According to the method, stress relief annealing and spark plasma sintering treatment are carried out on additive manufacturing forming parts in sequence. The stress relief annealing comprises the following steps that the temperature is increased to the annealing temperature in a protective atmosphere, and the temperature is kept; the annealing temperature is (0.3-0.4)T; and the temperature of the spark plasma sintering is (0.8-0.9)T, and the time is 10-20 min. According to the method, the stress relief annealing of specific parameters and SPS sintering of specific parameters are adoptedon metal obtained throughadditive manufacturing in sequence, so that not only are the product cracks eliminated, but also the mechanical property is greatly improved.

Description

technical field [0001] The invention provides a method for eliminating cracks in additive manufacturing of metal materials and improving mechanical properties, which belongs to the technical field of additive manufacturing. Background technique [0002] Additive manufacturing technology of metal materials is a method of building a three-dimensional model using a computer. Under the control of the computer, powder or wire is used as a raw material, and the powder or wire is selectively melted by a focused heat source to form a complex layer by layer. of three-dimensional entities. Additive manufacturing of metal materials can manufacture complex geometric components, and at the same time, it can improve the production efficiency of parts and reduce material waste, greatly reduce costs and shorten manufacturing time, and has broad application prospects in aerospace, transportation, biomedical and other fields. [0003] Laser additive manufacturing of metal materials has a lar...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/24B22F3/105B33Y40/00
CPCB22F3/105B22F3/24B22F2003/248B33Y40/00Y02P10/25
Inventor 刘祖铭彭凯赵凡魏冰吕学谦李全
Owner CENT SOUTH UNIV
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