Method for directly molding high-entropy alloy turbine engine hot end component through laser metal

A technology for turbine engine and hot-end components, which is applied in the field of laser metal direct forming of high-entropy alloy turbine engine hot-end components, can solve the problems of difficulty in obtaining high-entropy alloys, difficult processing and manufacturing, and achieves reducing manufacturing costs and meeting application requirements. , the effect of improving efficiency

Active Publication Date: 2015-02-25
XI AN JIAOTONG UNIV
5 Cites 32 Cited by

AI-Extracted Technical Summary

Problems solved by technology

At the same time, because of the high melting point of high-entropy alloys, it is difficult to process and manufacture them by traditional investment casting methods. The curr...
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Method used

1) eight kinds of refractory metals from tungsten (W), titanium (Ti), zirconium (Zr), hafnium (Hf), vanadium (V), niobium (Nb), tantalum (Ta) and molybdenum (Mo) Select any five or more kinds of powder, and mix them evenly according to a certain molar ratio (to ensure that the atomic percentage of each main element is between 5% and 30%). In different ways, it is formulated into a special powder suitable for the LMDF process; the proportion of some elements varies with the growth height gradient, which means that in the longitudinal or transverse growth direction of the hot end part, the content of a certain metal powder can be linearly increased to achieve local reinforcement. performance purposes. For example, due to the complicated stress on the root of the blade, local mechanical properties need to be strengthened. We can linearly increase the Mo element during the additive manufacturing process from the top of the blade to the root of the blade to achieve grain refinement. The purpose of enhancing its mechanical properties.
6) Surface treatments such as removal of auxiliary support structure, abrasive flow process finishing and surface sandblasting are carried out to the green body after annealing treatment, and finally obtain a high-entropy alloy turbine engine hot end component with good high-temperature performance and good dimensional accuracy.
Choose W, Ti, Zr, V, Ta five kinds of metals, according to equiatomic ratio, be configured into high-entropy alloy powder, place in the synchronous powder feeding equipment of LMDF rapid prototyping equipment. UG software is used to establish a three-dimensional CAD model of the turbine disk, slice and layer it, import it into Magics software to add auxiliary support structures, and then import the obtained stl format file into an industrial computer. According to the vapor pressure of these five different elements, the laser power is selected as 200W. At the same time, due to the fine structure inside the turbine disk and the high requirements for the surface quality and forming accuracy of the formed parts, a lens with a small focal length (100mm) is required to obtain fine Focused spot size (50μm). The mixed scanning path of contour + grating + partition is adopted, the scanning speed is set to 100 mm/s, and the scanning layer thickness Δh is 50 μm. Fill the molding chamber with protective gas (argon) to prevent the high-entropy alloy powder from being oxidized. After adjusting the equipment, turn on the synchronous powder feeding equipment, turn on the laser, and start the laser rapid prototyping process. After continuous layer-by-layer additive manufacturing, a turbine disk green body with an auxiliary support structure is obtained. Finally, the redundant auxiliary support structure ...
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Abstract

The invention discloses a manufacturing method for directly molding a high-entropy alloy turbine engine hot end component through laser metal, and belongs to the technical field of manufacturing of turbine engine hot end components. The method includes the steps that any five or more kinds of high-melting metal powder is selected from eight kinds of high-melting metal powder, and the high-melting metal powder is evenly mixed to prepare high-entropy alloy powder; a three-dimensional solid model of the turbine engine hot end component is built, necessary auxiliary supporting structures are additionally arranged, and data files in the stl format are obtained and led into a rapid molding device; a blank of the turbine engine hot end component is rapidly molded through the LMDF technology, heat processing is carried out, then the auxiliary supporting structures are removed, abrasive particle stream finish machining and surface processing are carried out, and the high-entropy alloy turbine engine hot end component with the good high-temperature behavior is obtained. The turbine engine hot end component molded with the method has the high density and the excellent high-temperature behavior; meanwhile, the high molding precision and the high surface precision are achieved, and rapid and accurate manufacturing of the high-performance turbine engine hot end component can be achieved.

Application Domain

Technology Topic

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  • Method for directly molding high-entropy alloy turbine engine hot end component through laser metal
  • Method for directly molding high-entropy alloy turbine engine hot end component through laser metal
  • Method for directly molding high-entropy alloy turbine engine hot end component through laser metal

Examples

  • Experimental program(2)

Example Embodiment

[0052] Example 1
[0053] Five metals, W, Ti, Zr, V, and Ta, were selected and configured into high-entropy alloy powder according to the atomic ratio, and placed in the synchronous powder feeding equipment of the LMDF rapid prototyping equipment. The 3D CAD model of the hollow turbine blade is established by UG software and sliced ​​and layered, imported into Magics software to add auxiliary support structure, and the obtained stl format file is imported into the industrial computer. According to the vapor pressure of these five different elements, the laser power is selected as 200W. At the same time, due to the tiny air film holes and exhaust edge structure inside the hollow turbine blade, and the high requirements for the surface quality and forming accuracy of the formed parts, it is necessary to use small focal length of the lens (100mm) to obtain a fine focused spot size (30μm). A hybrid scanning path of contour + grating + partition was adopted, the scanning speed was set to 100 mm/s, and the scanning layer thickness Δh was 30 μm. A shielding gas (argon) was charged into the molding chamber to prevent oxidation of the high-entropy alloy powder. After adjusting the equipment, turn on the synchronous powder feeding equipment, turn on the laser, and start the laser rapid prototyping process. After continuous layer-by-layer additive manufacturing, a hollow turbine blade blank with an auxiliary support structure is obtained. Finally, the excess auxiliary support structure in the green body is removed by wire cutting process, and then the green body is subjected to abrasive flow finishing and surface sandblasting treatment, and finally a hollow turbine with dense structure, good forming accuracy and surface quality, and excellent high temperature mechanical properties is obtained. blade. like Figure 4 As shown, the blade basin 15, the trailing edge 16 and the blade back 17 have distinct shapes, compact structures, high forming precision, good surface quality, and excellent high temperature mechanical properties.

Example Embodiment

[0054] Example 2
[0055] Five metals, W, Ti, Zr, V, and Ta, were selected and configured into high-entropy alloy powders according to the same atomic ratio, and placed in the synchronous powder feeding equipment of the LMDF rapid prototyping equipment. The 3D CAD model of the turbine disk is established by UG software and sliced ​​and layered, and then imported into Magics software to add auxiliary support structure, and the obtained stl format file is imported into the industrial computer. According to the vapor pressure of these five different elements, the laser power is selected to be 200W. At the same time, due to the fine structure inside the turbine disk, and the high requirements for the surface quality and forming accuracy of the formed parts, a lens with a small focal length (100mm) is required to obtain fine The focused spot size (50 μm). A hybrid scanning path of contour + grating + partition was adopted, the scanning speed was set to 100 mm/s, and the scanning layer thickness Δh was 50 μm. A shielding gas (argon) was charged into the molding chamber to prevent oxidation of the high-entropy alloy powder. After adjusting the equipment, turn on the synchronous powder feeding equipment, turn on the laser, and start the laser rapid prototyping process. After continuous layer-by-layer additive manufacturing, a turbine disk blank with an auxiliary support structure is obtained. Finally, the excess auxiliary support structure in the green body is removed by wire cutting process, and then the green body is subjected to abrasive flow finishing and surface sandblasting treatment, and finally a turbine disk with dense structure, good forming accuracy and surface quality, and excellent high temperature mechanical properties is obtained. . like Figure 5 As shown, the outer ring 18 , the cold air holes 19 , the disc 20 and the guide vanes 21 have compact structures, good forming accuracy and surface quality, and excellent high-temperature mechanical properties.
[0056] Laser metal direct forming (LMDF) technology, as an advanced additive manufacturing technology, can use laser to directly form functional parts with almost any shape and complete metallurgical bonding. At the same time, the processed parts have high density and high Forming accuracy and surface quality. For high-entropy alloy powders composed of five or more refractory metals, the LMDF technology can be used to melt the metal powder by laser scanning to form a molten pool, and then solidify and accumulate through the molten pool. end parts, thus solving the problem that high-entropy alloys cannot obtain parts by traditional investment casting methods. Therefore, this method can fabricate high-entropy alloy turbine engine hot-end components with good high-temperature performance above 1600 °C.
[0057] To sum up, the high-entropy alloy prepared by using the high-melting point metal powder in the present invention needs to be investment cast at above 2000 ° C. The current ceramic casting cannot meet such a high temperature, and the LMDF technology can use the laser to convert the high-entropy alloy The powder melts rapidly to form a molten pool, and then solidifies and accumulates through the molten pool to realize the additive manufacturing of high melting point metals. The use of LMDF technology makes the present invention not limited by the complexity of the formed parts, without the need for support, the hot end parts of the turbine engine are directly formed, and the errors generated in the traditional investment casting core and shell assembly process are avoided. The invention utilizes the LMDF forming technology to realize the direct forming of the hot end components of the turbine engine, has simple manufacturing process, high forming speed, greatly improves the efficiency, and reduces the production cost at the same time.
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PUM

PropertyMeasurementUnit
Particle size200.0 ~ 400.0mesh
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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