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Method for reducing cracks of nickel-based superalloy formed by SLM (selective laser melting) and improving mechanical property

A nickel-based superalloy and crack technology, applied in the field of additive manufacturing engineering, can solve the problems of large laser melting thermal gradient, reduced mechanical properties of formed parts, large residual stress of formed parts, etc. The effect of less loss

Active Publication Date: 2021-06-29
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the large thermal gradient of laser selective melting and repeated remelting lead to large residual stress of the formed part, which is prone to cracking, especially the nickel-based superalloy with high Cr content, which is prone to a large number of cracks during the forming process, which seriously reduces the Mechanical properties of formed parts

Method used

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  • Method for reducing cracks of nickel-based superalloy formed by SLM (selective laser melting) and improving mechanical property
  • Method for reducing cracks of nickel-based superalloy formed by SLM (selective laser melting) and improving mechanical property
  • Method for reducing cracks of nickel-based superalloy formed by SLM (selective laser melting) and improving mechanical property

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] First use the same GH3536 spherical powder (particle size range 15-45μm), weigh Y(NO 3 ) 3 ·6H 2 Pour 17g of O powder into absolute ethanol, and stir it with ultrasonic vibration for 3min until it is completely dissolved; weigh 495g of GH3536 powder, pour it into the above-mentioned beaker containing yttrium nitrate absolute ethanol solution, and stir it with ultrasonic vibration for 10min to make the metal powder and the solution Fully contact wet; put the beaker into a drying oven at a drying temperature of 70°C, and dry until the absolute ethanol evaporates completely to obtain GH3536 powder coated with yttrium nitrate.

[0051] Put the dried powder into a tube furnace, raise the temperature to 400°C at a heating rate of 10°C / min, keep it warm for 2.5 hours, then cool with the furnace, and pass argon gas into the whole process to decompose yttrium nitrate into yttrium oxide coating On the GH3536 powder; the calcined powder was ground and sieved to obtain GH3536 pow...

Embodiment 2

[0059] First use the same GH3536 spherical powder, weigh Y(NO 3 ) 3 ·6H 2 Pour 20g of O powder into absolute ethanol, and stir with ultrasonic vibration for 3 minutes until it is completely dissolved; weigh 495g of GH3536 powder, pour it into the above-mentioned beaker containing yttrium nitrate absolute ethanol solution, and stir with ultrasonic vibration for 10 minutes to make the metal powder and the solution Fully contact wet; put the beaker into a drying oven at a drying temperature of 75°C, and dry until the absolute ethanol evaporates completely to obtain GH3536 powder coated with yttrium nitrate.

[0060] Put the dried powder into a tube furnace, raise the temperature to 410°C at a heating rate of 11°C / min, keep it warm for 2.5 hours, and then cool with the furnace. Argon gas is introduced throughout the process to decompose yttrium nitrate into yttrium oxide coating On the GH3536 powder; the calcined powder was ground and sieved to obtain 500.89g of GH3536 powder un...

Embodiment 3

[0066] First use the same GH3536 spherical powder, weigh Y(NO 3 ) 3 ·6H 2 Pour 13g of O powder into absolute ethanol, and stir it with ultrasonic vibration for 3 minutes until it is completely dissolved; weigh 495 g of GH3536 powder, pour it into the above-mentioned beaker containing the yttrium nitrate absolute ethanol solution, and stir it with ultrasonic vibration for 10 minutes to make the metal powder and the solution Fully contact wet; put the beaker into a drying oven at a drying temperature of 75°C, and dry until the absolute ethanol evaporates completely to obtain GH3536 powder coated with yttrium nitrate.

[0067] Put the dried powder into a tube furnace, raise the temperature to 420°C at a heating rate of 12°C / min, keep it warm for 3 hours, and then cool down with the furnace. Argon gas is introduced throughout the process to decompose yttrium nitrate into yttrium oxide coated on On the GH3536 powder; the calcined powder was ground and sieved to obtain 498.23g of ...

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Abstract

The invention provides a method for reducing cracks of nickel-based superalloy formed by SLM (selective laser melting) and improving mechanical property. The method comprises the following steps: pouring yttrium nitrate powder into absolute ethyl alcohol, and carrying out ultrasonic vibration stirring until the yttrium nitrate powder is completely dissolved; pouring GH3536 nickel-based high-temperature powder into a yttrium nitrate absolute ethyl alcohol solution, and carrying out ultrasonic vibration stirring, enabling metal powder and the solution to be fully contacted and wetted; drying the obtained solid-liquid mixture, then putting the solid-liquid mixture into a tubular furnace for calcining, and then cooling along with the furnace; grinding and screening the obtained calcined powder to obtain GH3536 powder uniformly coated with yttrium oxide; and preparing a GH3536 nickel-based high-temperature alloy block sample from the yttrium oxide uniformly coated GH3536 nickel-based high-temperature powder through a selective laser melting method. According to the method, the number of cracks in the SLM printed GH3536 nickel-based high-temperature alloy is effectively reduced, the microstructure state is improved, and the mechanical property of the GH3536 nickel-based high-temperature alloy is greatly improved.

Description

technical field [0001] The invention belongs to additive manufacturing engineering technology, and in particular relates to a method for reducing cracks in nickel-based superalloys formed by SLM and improving mechanical properties. Background technique [0002] GH3536 nickel-based superalloy is suitable for the manufacture of aero-engine combustion chambers due to its good oxidation resistance and corrosion resistance, good cold and hot forming and welding properties below 900 °C, and medium durability and creep strength. Components and other high-temperature components are used for a long time, and the short-term working temperature reaches 1080°C. It can withstand a certain stress at a high temperature of 600-1200°C and has anti-oxidation or corrosion resistance. However, the forming process of traditional casting GH3536 not only consumes a lot of materials and has a low material utilization rate, but also has a long manufacturing cycle and increased manufacturing costs. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F10/28B22F1/02B33Y70/10B33Y80/00B33Y40/10B22F9/04C22C19/05C22C1/04
CPCB33Y70/10B33Y80/00B33Y40/10B22F9/04C22C19/055C22C1/0433B22F1/16
Inventor 马宗青程晓鹏赵亚楠刘永长
Owner TIANJIN UNIV
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