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A crack-free nickel-based superalloy and its composition design method and preparation method

A nickel-based superalloy and composition design technology, applied in the field of metal additive manufacturing, can solve the problems of prolonging the process flow, limited improvement effect, increasing production cost, etc., to reduce stacking fault energy, improve thermal oxidation resistance, The effect of increasing the operating temperature

Active Publication Date: 2022-03-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Substrate preheating has a limited effect on improving microcracks in nickel-based superalloys, but also causes energy waste; although hot isostatic pressing can significantly improve microcracks in nickel-based superalloys, it prolongs the process and increases production costs

Method used

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  • A crack-free nickel-based superalloy and its composition design method and preparation method
  • A crack-free nickel-based superalloy and its composition design method and preparation method
  • A crack-free nickel-based superalloy and its composition design method and preparation method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Modified GH3536M alloy composition, by mass percentage: Mo: 10.94%, Cr: 24.96%, W: 1.18%, Co: 4.27%, Fe: 10.55%, C: 0.073%, Mn: 0.61%, Si: 0.3% , and the balance is Ni. The preparation method comprises the following steps:

[0056] S1. Alloy powder preparation:

[0057] 1) Raw material smelting: Weigh the raw material of the intermediate compound metal block according to the proportion of alloy elements and place it in a vacuum induction furnace for heating and melting. The above-mentioned pre-alloyed metal after smelting is transferred into an atomizing tank, and argon gas is used to make powder, and the atomization pressure is about 2.0MPa; 3) Powder screening: the above-mentioned pre-alloyed powder is subjected to a visual screening process to obtain an average particle size of 31.8μm metal powder, the particle size range is 15μm~53μm, the appearance of the modified GH3536 alloy powder is as follows figure 1 4) heat preservation and drying: put the above-mentioned...

Embodiment 2

[0061] Modified GH3536M alloy composition, by mass percentage: Mo: 10.94%, Cr: 24.96%, W: 1.18%, Co: 4.27%, Fe: 10.55%, C: 0.073%, Mn: 0.61%, Si: 0.3% , the balance is Ni; the Md and B of the GH3536M 0 The values ​​are 0.9275 and 0.8598.

[0062] The traditional GH3536 and the modified GH3536M are subjected to laser selective melting and forming. The specific parameters are: substrate preheating temperature 100°C, laser scanning power 240w, laser scanning speed 600mm / s, powder coating thickness 0.04mm, scanning distance 0.1mm, progressive scanning 67° rotation between layers.

[0063] The GH3536 alloy and GH3536M alloy were formed by selective laser melting, and after electrochemical polishing, the microstructures were compared and analyzed, as follows: Figure 4 As shown in (a) and (b), the comparison found that the microcracks of the GH3536M alloy were almost eliminated.

[0064] For the modified GH3536M alloy formed by selective laser melting and the traditional brand GH...

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Abstract

The invention belongs to the field of metal additive manufacturing, and specifically discloses a non-crack nickel-based superalloy and its composition design method and preparation method. In terms of mass percentage, the composition of the non-crack nickel-based superalloy is: Mo: 10.50%~ 11.00%, Cr: 24.50% to 25.30%, W: 1.00% to 1.50%, Co: 4.00% to 4.50%, Fe: 10.00% to 11.00%, C: 0.05% to 0.08%, Mn: 0.60% to 0.80% , Si: 0-0.30%, the balance being Ni. The nickel-based superalloy can make full use of the rapid solidification effect of the laser selective melting forming technology, which can significantly improve the strength of the GH3536 alloy, and at the same time significantly reduce the micro-crack defects and mechanical properties of the traditional nickel-based superalloy in the laser selective melting forming process. superior.

Description

technical field [0001] The invention belongs to the field of metal additive manufacturing, and more specifically relates to a crack-free nickel-based superalloy and its component design method and preparation method. Background technique [0002] In recent years, selective laser melting is a disruptive technology based on the highly cross-integration of materials, machinery, computers and other disciplines. Integrating materials and structural design into manufacturing is an effective way to realize complex component manufacturing. In recent years, laser selective melting forming of nickel-based superalloys has received extensive attention in the aerospace field. This is because: With the increasingly high requirements for lightweight, integrated and high-performance components in aerospace, traditional casting, forging and welding processing methods are difficult to form high-temperature alloy parts with complex overall structures and high performance , Laser selective mel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C19/05B22F9/08C22C1/02
CPCC22C19/055C22C1/023B22F9/082
Inventor 魏青松孙闪闪滕庆谢寅程坦李继康
Owner HUAZHONG UNIV OF SCI & TECH
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