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A kind of preparation method of nb-si-ti alloy with directionally solidified structure

A technology of nb-si-ti and directional solidification, which is applied in the field of preparation of high-temperature structural materials, can solve problems such as difficulty in guaranteeing mechanical properties and coarse structure of Nb-Si-based alloys, so as to improve room temperature fracture toughness, improve comprehensive mechanical properties, The effect of eliminating component segregation

Active Publication Date: 2020-03-31
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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AI Technical Summary

Problems solved by technology

[0004] In addition, the Nb-Si-based alloys prepared by the above-mentioned directional solidification methods are relatively coarse, and the mechanical properties are difficult to guarantee, and it is difficult to directly prepare alloy parts with specific dimensions, complex shapes, and structures (variable cross-sections, inner cavities, or cooling channels).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0034] A kind of preparation method of Nb-18Si-23Ti alloy with directionally solidified structure:

[0035] (1) Sieve commercially available pure Nb powder, pure Si powder and pure Ti powder through a metal sieve to obtain pure Nb powder, pure Si powder and pure Ti powder with an average particle size of about 80 μm.

[0036] (2) According to the composition of the Nb-18Si-23Ti alloy in atomic percentage, the 80 μm pure Nb powder, pure Si powder and pure Ti powder obtained in step (1) were mixed. A planetary ball mill was used to mix for 2 hours, and no balls were added during the mixing process.

[0037] (3) Put the mixed powder of Nb, Si and Ti in the powder feeder of the laser rapid prototyping system, and adopt the powder feeding head coaxial with the laser beam. Use high-purity argon as the powder feeding airflow, set the powder-carrying airflow as: 8L / min, use argon as the protective gas, and the protective gas flow rate as: 20L / min.

[0038](4) The directionally solid...

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PUM

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Abstract

The invention belongs to the technical field of preparation of high-temperature structural materials, and relates to a powder feeding type laser rapid forming technology, in particular to a preparation method of a Nb-Si-Ti alloy with a directional solidification structure. The Nb-Si-Ti ternary alloy with fine directional solidification structure characteristics is prepared by adopting the powder feeding type laser rapid forming technology, commercially available pure element powder is used as a raw material, spherical powder or pre-alloyed powder does not need to be prepared particularly, andthe preparation process of the raw material is simple; the Nb-Si-Ti alloy with an eutectic component or a sub-eutectic component is adopted, and the influence of primary silicide relative to the directional solidification structure continuity is avoided; after the deposited alloy is cooled to below 100 DEG C, a next deposition layer is prepared, a directional solidification alloy is adopted as a forming substrate, a directional hot flow can be formed in the powder feeding type laser rapid forming process, and the structure stability of the Nb-Si-Ti alloy is ensured; and through point-by-pointmelting and solidification of the powder, the problems of unavoidable component segregation in the traditional casting Nb-Si process, the uniform structure and coarse grain are eliminated.

Description

technical field [0001] The invention belongs to the technical field of preparation of high-temperature structural materials, and relates to a powder-feeding laser rapid prototyping technology, in particular to a method for preparing a Nb-Si-Ti alloy with a directional solidification structure. Background technique [0002] The Nb-Si alloy is toughened by Nb-based solid solution (NbSS) at room temperature and enhanced by silicide at high temperature. However, the requirements of its strength and toughness indicators on the structure are contradictory, which makes the comprehensive performance matching and regulation of the alloy extremely challenging. According to existing studies, directional solidification can simultaneously improve the room temperature fracture toughness and high temperature strength of Nb-Si based superalloys. SS / Nb 5 Si 3 The room temperature toughness of multi-component Nb-16Si-24Ti-8Hf-2Al-2Cr alloy can reach up to 23MPa m 1 / 2 , The strength at 120...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/04B22F3/105C22C1/04
CPCB22F3/105B22F7/04B22F2007/045C22C1/045Y02P10/25
Inventor 刘伟熊华平李能孙兵兵梁家誉黄帅
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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