An integrated method for forming and controlling nial alloy thin-walled pipe fittings
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An alloy, thin-walled technology, applied in the field of precision forming of intermetallic compound thin-walled pipe fittings, can solve the problems of voids, material fractures, and complicated welding process.
Active Publication Date: 2020-07-07
DALIAN UNIV OF TECH
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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
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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 a 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 is 400°C, the gas pressure of the expansion is 20MPa, and the time of the expansion 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 inflation...
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Abstract
The invention provides a forming and control integration method of NiAl alloy thin-walled pipe fittings, which belongs to the technical field of precision forming of intermetallic compound thin-walled pipe fittings. In the present invention, Ni foil and Al foil are laminated alternately and coiled to obtain a Ni / Al laminated foil tube; the Ni / Al laminated foil tube is subjected to plastic forming, reaction synthesis and densification treatment in an inflation forming mold to obtain a NiAl alloy Thin wall pipe fittings. The invention solves the problems of difficult material flow, microstructure and performance control and complicated procedures in the preparation of the existing NiAl alloy slab and thin-walled pipe fittings formed from the slab. The data of the examples show that the NiAl alloy thin-walled pipe fittings obtained by the method of the present invention have high forming rate, high dimensional accuracy, uniform distribution of components, good compactness of the pipe fittings, and no defects on the 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...
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