Ni3Al-based alloy and additive manufacturing method thereof

A technology of additive manufacturing and base alloy, which is applied in the direction of additive manufacturing and additive processing, and can solve problems such as poor mechanical properties at high temperatures

Active Publication Date: 2022-05-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently developed Ni 3 Most Al-based alloys have a γ+γ′ two-phase structure, which has the advantages of high specific strength, excellent oxidation resistance, and low crack growth rate, but its high-temperature mechanical properties are poor.

Method used

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  • Ni3Al-based alloy and additive manufacturing method thereof
  • Ni3Al-based alloy and additive manufacturing method thereof
  • Ni3Al-based alloy and additive manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Prealloyed Ni 3 The Al powder and the pure Al powder were placed in a constant temperature vacuum drying oven for 8 hours at 120°C, and then the dried pre-alloyed Ni 3 Al powder and pure Al powder are mixed by mechanical mixing method, and then ball milled by ball mill to obtain Al-Ni rich powder with excellent sphericity and powder particle size range of 15-53 μm 3 Al alloy powder; among them, pre-alloyed Ni 3 The chemical composition of Al powder is (mass content): Ni 81.1%, Al 8%, Cr7.7%, Mo1.43%, Zr1.7%, B 0.008% and the impurity of balance;

[0048] will be rich in Al-Ni 3 Al alloy powder is placed in the ProX2003D printer for selective laser melting. Hastelloy alloy substrates are used, and the surface of the substrate is polished with sandpaper. The thickness is 30 μm, and the scanning strategy is the hexagonal strategy, and the Ni 3 Al-based alloy, chemical composition (mass content): Ni 74.1%, Al 14.7%, Cr 7.7%, Mo 1.43%, Zr1.7%, B 0.008% and the balance of...

Embodiment 2

[0051] The difference from Example 1 is that the laser power is 200W.

Embodiment 3

[0053] The difference from Example 1 is that the scanning speed is 1300 mm / s.

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Abstract

The invention belongs to the technical field of Ni3Al-based alloys, Al powder is added into pre-alloyed Ni3Al powder to increase the Al content in the alloy, so that a beta-NiAl phase is introduced, the obdurability of a gamma '-Ni3Al phase is improved, the phase composition and the structure morphology of the Ni3Al-based alloy are changed, the number of cracks is reduced, and the Ni3Al-based alloy shows high high-temperature mechanical properties; and the high-temperature mechanical property of the Ni3Al-based alloy is further improved by controlling the laser power of selective laser melting. The result of the embodiment shows that the tensile strength at 650 DEG C of the Ni3Al-based alloy prepared by the method provided by the invention is 927.1 MPa, the elongation at break at 650 DEG C is 4.4%, the tensile strength at 1000 DEG C is 193.5 MPa, and the elongation at break at 1000 DEG C is 47.5%.

Description

technical field [0001] The present invention relates to Ni 3 Al-based alloy technical field, especially relate to a kind of Ni 3 Al-based alloy and additive manufacturing method thereof. Background technique [0002] Compared with the traditional subtractive manufacturing method by reducing multiple parts, additive manufacturing is based on a layer-by-layer incremental manufacturing method. Most additive manufacturing technologies usually use powder or wire as raw materials, which are melted by a concentrated heat source. , and solidified in the subsequent cooling process to form parts, it has attracted much attention in the past few decades because of its high degree of design freedom and low process cycle. [0003] Laser selective melting is a kind of additive manufacturing. Laser selective melting mainly uses laser to scan a single point along the planned path, lay powder layer by layer, and overlap layer by layer to realize the "net forming" of the metal structure. In...

Claims

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Application Information

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IPC IPC(8): C22C19/05C22C1/04B22F10/28B33Y10/00B33Y80/00
CPCC22C19/057C22C19/007B22F10/28C22C1/0433B33Y10/00B33Y80/00Y02P10/25
Inventor 任忠鸣王江陈超越刘明宇帅三三胡涛徐松哲
Owner SHANGHAI UNIV
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