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NiAl alloy thin-walled pipe fitting forming and controlling performance integrated method

An alloy and thin-walled technology, which is applied in the field of precision forming of intermetallic compound thin-walled pipe fittings, can solve problems such as many defects in superplastic forming, difficult pipe rolling process, and complicated welded pipe process, so as to achieve good composition uniformity and improve dimensional accuracy , The effect of the safety of the preparation process

Active Publication Date: 2019-08-20
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the coiling process is difficult, the welded pipe process is complicated, the superplastic forming process has high requirements for forming equipment and material structure, the forming rate is low, and there are many defects in superplastic forming of thin-walled pipe fittings, such as voids are easy to occur during the deformation process, resulting in material fracture

Method used

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  • NiAl alloy thin-walled pipe fitting forming and controlling performance integrated method
  • NiAl alloy thin-walled pipe fitting forming and controlling performance integrated method
  • NiAl alloy thin-walled pipe fitting forming and controlling performance integrated method

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Experimental program
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Effect test

Embodiment 1

[0065] An integrated method for forming and controlling NiAl alloy thin-walled pipe fittings, comprising the following steps:

[0066] (1) According to the atomic number ratio of Ni atoms and Al atoms in NiAl alloy, calculate the thickness ratio of Ni foil and Al foil; polish Ni foil and Al foil with fine sandpaper, and then put it into acetone solution for ultrasonic Wash, then soak in distilled water for 1 min, take it out and dry it with cold air to obtain pretreated Ni foil and pretreated Al foil; the specific calculation process of the thickness ratio of Ni foil and Al foil is:

[0067] N=n×N A (1); Wherein, N represents number of atoms, and n represents the amount of substance, N A represents Avogadro's number;

[0068] m=n * M (II), wherein, m represents quality, and n represents the amount of substance, and M represents the molar mass of substance;

[0069] h=m / (ρ S) (III), wherein, h represents height, m ​​represents quality, ρ represents density, and S represents ...

Embodiment 2

[0076] An integrated method for forming and controlling NiAl alloy thin-walled pipe fittings, comprising the following steps:

[0077] (1) same as embodiment 1;

[0078] (2) Alternately stack several pretreated Ni foils and several pretreated Al foils to obtain Ni / Al laminated foil; Insert the metal shaft tube inside, and apply boron nitride solder resist between the Ni / Al laminated foil tube and the metal shaft tube, and put the Ni / Al laminated foil tube and the metal shaft tube into the cylindrical cavity mold as a whole The temperature of the expansion joint is 400°C, the gas pressure of the expansion joint is 20MPa, and the expansion joint time is 0.5h; then the Ni / Al laminated foil tube and the metal shaft tube are taken out as a whole, and the internal Take out the metal shaft tube;

[0079] (3) The Ni / Al laminated foil tube is placed in the inflation forming mold, and the inflation forming mold is heated to 400°C for inflation forming. The pressure required for the in...

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Abstract

The invention provides an NiAl alloy thin-walled pipe fitting forming and controlling performance integrated method and belongs to the technical field of precise forming of intermetallic compound thin-walled pipe fittings. The NiAl alloy thin-walled pipe fitting forming and controlling performance integrated method comprises the following steps that Ni foils and Al foils are alternately laminatedand coiled to obtain an Ni / Al foil an ag / l laminated foil tube; and the Ni / Al laminated foil tube is subjected to plastic forming, reaction synthesis and densification treatments in an air expansion forming die to obtain the NiAl alloy thin-walled pipe fitting. The NiAl alloy thin-walled pipe fitting forming and controlling performance integrated method solves the problems of difficulty in controlof material flowing and tissue performance and complex procedures of existing NiAl alloy slab preparation and the thin-walled pipe fitting formed with a slab. Data of the embodiment of the inventionshows that the NiAl alloy thin-walled pipe fitting obtained by the method is high in forming rate and size precision, uniform in component distributed, good in compactness and non-defective in surface.

Description

technical field [0001] The invention relates to the technical field of precision forming of intermetallic compound thin-walled pipe fittings, in particular to a forming and controllable integrated method of NiAl alloy thin-walled pipe fittings. Background technique [0002] NiAl alloy has the advantages of high melting point, low density, high thermal conductivity, high structural stability and excellent oxidation resistance, making it superior to traditional titanium alloys in the field of high-temperature engineering, and can fill the gap between traditional high-temperature alloys and high-temperature structural ceramics. Blank is a new type of high-temperature structural material with great potential. NiAl alloy pipe fittings have good application prospects in the engineering field, mainly used in aero-engines and ultra-high-speed aerospace vehicle inlets and flame tubes and other components. However, due to the inherent brittleness of intermetallic compounds, the use o...

Claims

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Application Information

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IPC IPC(8): B21D33/00B21D26/047B21D26/041
CPCB21D33/00B21D26/047B21D26/041B21C37/30C22C21/00B21D37/16B21D26/053B21D26/059B21C37/0815B21C37/154B23K31/027B23K2101/18B23K2103/10B23K2103/26B23K2103/18B23K20/021B23K20/2333B23K20/24B23K20/16B23K20/026C22C19/03B32B15/017F16L9/02B21C37/0818B21D31/04
Inventor 苑世剑
Owner DALIAN UNIV OF TECH
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