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Structure controlled preparation method for Nb-Si-based complex alloy

A technology of base alloy and structure, applied in the field of changing the structure of Nb-Si base multi-alloy, can solve the problems of reducing the plasticity and ductility at room temperature, smaller size, coarse structure, etc., to improve room temperature performance, reduce processing cost, Avoid performance degradation effects

Inactive Publication Date: 2012-04-18
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the structure of Nb-Si-based alloys prepared by conventional processes such as vacuum arc melting, induction melting, and optical suspension zone melting and directional solidification is coarse, which is specifically reflected in the Nb 5 Si 3 and Cr 2 The Nb phase presents a large block or lath with sharp edges and corners, and the subsequent heat treatment cannot completely break up the bulk silicide and Laves phase in the Nb-Si-based alloy structure prepared by the conventional process, and the size becomes smaller, which will cause subsequent deformation. Or cause stress concentration during use and become the source of cracks, which significantly reduces the room temperature plasticity and ductility of the material

Method used

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  • Structure controlled preparation method for Nb-Si-based complex alloy
  • Structure controlled preparation method for Nb-Si-based complex alloy
  • Structure controlled preparation method for Nb-Si-based complex alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The nominal composition of embodiment 1 is Nb 50 Si 12 Ti 24 al 2 Cr 10 f 2

[0029] Step 1: Prepare master alloy ingot

[0030] 99.8wt% niobium (Nb), 99.9wt.% silicon (Si), 99.8wt.% titanium (Ti), 99.9wt.% aluminum (Al), 99.9wt.% chromium (Cr), 99.8wt.% hafnium (Hf) according to the nominal composition ratio;

[0031] Vacuum non-consumable electric arc furnace is used for melting, and the vacuum degree of the vacuum chamber of non-consumable electric arc furnace is 3×10 -3 Pa, then fill with high-purity argon (mass percentage purity 99.99%) to make the vacuum of the vacuum chamber to 0.5 × 10 5 Pa; the alloy ingot was repeatedly smelted four times to ensure uniform composition, and the current during the smelting process was 1300A to prepare a 1.5kg master alloy ingot;

[0032] Step 2: Cut the test rod from the master alloy ingot by wire cutting method, the diameter of the test rod is about 14mm; then use sandpaper to clean the scale on the surface of the test...

Embodiment 2

[0039] Embodiment 2 Nominal composition is Nb 48 Si 12 Ti 22 al 2 Cr 14 f 2

[0040] Step 1: Prepare master alloy ingot

[0041] 99.8wt% niobium (Nb), 99.9wt.% silicon (Si), 99.8wt.% titanium (Ti), 99.9wt.% aluminum (Al), 99.9wt.% chromium (Cr), 99.8wt.% Hafnium (Hf) according to the nominal composition ratio; the vacuum degree of the vacuum chamber of the vacuum non-consumable electric arc furnace is 4×10 -3 Pa, then fill with high-purity argon (mass percentage purity 99.99%) to make the vacuum of the vacuum chamber to 0.8 × 10 5 Pa; the alloy ingot was repeatedly smelted four times to ensure uniform composition, and the current during the smelting process was 800A to prepare a 1.5kg master alloy ingot;

[0042] Step 2: Cut the test rod from the master alloy ingot by wire cutting method, the diameter of the test rod is about 14mm; then use sandpaper to clean the scale on the surface of the test rod, wash it with acetone, and dry it at a drying temperature of 100 °C d...

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Abstract

The invention discloses a structure controlled preparation method for an Nb-Si-based complex alloy. According to the method, the structure of the Nb-Si-based complex alloy is controlled by adopting a combined process of unbalanced quick directional solidification and heat treatment; and the faceted growth property of silicide in the alloy is weakened, dimensions of a reinforcing phase Nb5Si3 and an anti-oxidation phase Cr2Nb in the alloy are remarkably reduced, a Nbss phase is used as the matrix in the steady-state structure of the Nb-Si-based complex alloy, the reinforcing phase Nb5Si3 is uniformly distributed on the matrix in a wormlike shape, and the anti-oxidation phase Cr2Nb is uniformly distributed or fixedly dissolved in the matrix in a granular shape, wherein the average length of the wormlike Nb5Si3 phase is less than 20 microns, the width of the Nb5Si3 phase is 5 microns, the size of the granular Cr2Nb phase is less than 10 microns, and the content of the two phases is not less than 35 percent. By structure control, the alloy contains enough Nb5Si3 and Cr2Nb phases, so that the alloy has good room temperature toughness and ductility on the premise of achieving excellent high-temperature mechanical property and oxidation resistance.

Description

technical field [0001] The present invention relates to a method for controlling the structure of Nb-Si-based multi-element alloys, more particularly, it refers to a method for controlling the structure of Nb-Si-based multi-element alloys by using a combined process of non-equilibrium rapid directional solidification and heat treatment method. Background technique [0002] Directional solidification is a casting technology that uses the principle that grains grow in the opposite direction of heat flow when the alloy solidifies, controls the direction of heat flow, and makes the casting crystallize in a specified direction. [0003] With the development of the aerospace industry, higher requirements are placed on the thrust-to-weight ratio of the new generation of aero-engines, and the improvement of engine performance strongly depends on the material of the turbine blades. The currently used turbine blade materials are nickel-based alloys and cobalt-based alloys. The maximu...

Claims

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Application Information

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IPC IPC(8): C22C29/18C22C32/00B22D27/04B22D21/06C22F1/18
Inventor 贾丽娜张虎原赛男盖京茹苏琳芬
Owner BEIHANG UNIV
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