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Method for reducing cracks and improving mechanical properties of slm-formed nickel-base superalloy

A nickel-based superalloy and mechanical technology, applied in the field of additive manufacturing engineering, can solve the problems of large thermal gradient of laser selective melting, reduction of mechanical properties of formed parts, and large residual stress of formed parts, so as to improve mechanical properties, reduce shedding, The effect of less loss

Active Publication Date: 2021-08-13
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 and improving mechanical properties of slm-formed nickel-base superalloy
  • Method for reducing cracks and improving mechanical properties of slm-formed nickel-base superalloy
  • Method for reducing cracks and improving mechanical properties of slm-formed nickel-base superalloy

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 high-temperature alloys formed by SLM and improving mechanical properties. Pour yttrium nitrate powder into absolute ethanol and stir until completely dissolved by ultrasonic vibration; pour GH3536 nickel-based high-temperature powder into yttrium nitrate-free In the water ethanol solution, ultrasonic vibration and stirring make the metal powder and the solution fully contact and wet; the obtained solid-liquid mixture is dried, then put into a tube furnace for calcination, and then cooled with the furnace; the obtained calcined powder Grinding and sieving were carried out to obtain GH3536 powder uniformly coated with yttrium oxide; the GH3536 nickel-based high-temperature powder uniformly coated with yttrium oxide was prepared by laser selective melting method to prepare GH3536 nickel-based superalloy block samples. The invention effectively reduces the number of cracks in the SLM printing GH3536 nickel-based superalloy, improves the microstructure state, and greatly improves the mechanical properties of the GH3536 nickel-based superalloy.

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 Patents(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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