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A Method for Preventing the Formation of Miscellaneous Crystal Defects in Single Crystal Superalloy Rotating Blades

A high-temperature alloy and rotating blade technology, which is applied in the field of high-temperature alloy single crystal blade preparation, can solve problems such as defects and small-angle grain boundaries on the edge plate, and achieve low cost, reduce the formation of miscellaneous crystal defects, and reasonable design

Active Publication Date: 2020-07-10
辽宁红银金属有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the seeding method adopts that when assembling the wax tree, paste the seeding strip on the blade wax model, and use the seeding strip to connect the bottom end of the blade with the edge edge of the middle and upper part of the blade, so that according to the conventional single crystal blade In the investment casting method, the single crystal grown from the crystal selector during directional solidification not only enters the blade body directly upward, but also enters the corner of the edge plate from the side through the seed strip, and then separates with the body of the blade body. The crystals converge to make the whole casting grow into a single crystal structure. Although this method avoids the nucleation and growth of miscellaneous crystals at the corners of the edge plate due to isolation and overcooling, when the dendrites in the seeding bar and the dendrites in the edge plate When the grains meet, it is easy to lead to the formation of small-angle grain boundary defects on the edge plate

Method used

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  • A Method for Preventing the Formation of Miscellaneous Crystal Defects in Single Crystal Superalloy Rotating Blades
  • A Method for Preventing the Formation of Miscellaneous Crystal Defects in Single Crystal Superalloy Rotating Blades
  • A Method for Preventing the Formation of Miscellaneous Crystal Defects in Single Crystal Superalloy Rotating Blades

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Effect test

Embodiment 1

[0033] In this embodiment, nickel-based single crystal superalloy AM3 is used, and the composition of the alloy is shown in Table 1.

[0034] Table 1 Alloying element weight percent

[0035] Cr Mo Al W Ti Ta co Ni 8.0 2.0 5.6 5.0 1.0 4.0 6.0 Remain

[0036] In this embodiment, a single crystal blade for an engine is taken as an example. The size of the single side edge plate of the single crystal blade is about 15 mm long x 10 mm wide x 2 mm thick. The alloy turns the temperature field at the edge of the blade, thereby reducing the formation of edge plate stray grain defects. Melt the paraffin at 50°C, inject the molten paraffin into the pre-designed single crystal blade metal mold with a thermal insulation riser through a wax injection machine, wherein the thermal insulation riser is 8mm long × 5mm wide × 0.5mm thick, and put Composition of the wax model Complete the combination of the wax model, dry the assembled wax model by hanging sl...

Embodiment 2

[0038] In this embodiment, nickel-based superalloy SRR99 is used, and the composition of the alloy is shown in Table 2.

[0039] Table 2 Weight percent of main alloying elements in SRR99 alloy

[0040] C Cr co Al Ti W Ta Nb Ni 0.05 9.0 6.0 5.5 1.0 9.5 3.0 1.0 Remain

[0041]This embodiment This embodiment takes a single crystal blade for an engine as an example. The size of the single side edge plate of the single crystal blade is about 35 mm in length x 15 mm in width x 5 mm in thickness. The temperature field at the edge plate of the rotating blade with superalloy crystals reduces the formation of stray grain defects on the edge plate. Melt the paraffin at 65°C, inject the molten paraffin into the pre-designed single crystal blade metal mold with a thermal insulation riser through a wax injection machine, wherein the thermal insulation riser is 12mm long x 8mm wide x 1mm thick and the wax mold Composition Completely assemble the wax p...

Embodiment 3

[0043] In this embodiment, a nickel-based superalloy René N5 is used, and the alloy composition is shown in Table 3.

[0044] Table 3 Weight percent of main alloying elements in René N5 alloy

[0045] Mo Cr co Al f W Ta Re Ni 2.0 7.0 8.0 6.2 0.15 5.0 7.0 3.0 Remain

[0046] This embodiment This embodiment takes the single crystal blade for an engine as an example. The size of the single side edge plate of the single crystal blade is about 85 mm long x 35 mm wide x 10 mm thick. The temperature field at the edge plate of the rotating blade with superalloy crystals reduces the formation of stray grain defects on the edge plate. Melt the paraffin at 80°C, inject the molten paraffin into the pre-designed single crystal blade metal mold with a thermal insulation riser through a wax injection machine, wherein the thermal insulation riser is 50mm long x 20mm wide x 10mm thick, and pour the wax The mold composition is to complete the combinatio...

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Abstract

The invention relates to the technical field of high-temperature alloy single crystal blade preparation, in particular to a method for preventing the formation of impurity crystal defects of single crystal high-temperature alloy rotating blades. The method comprises the following steps that (1), when a single crystal high-temperature alloy rotating blade mold is designed, a heat preservation riseris arranged at the position where the impurity impurity crystal defects are easily formed; (2) a single crystal high-temperature alloy rotating blade wax mold with a heat preservation riser is subjected to slurry hanging and sand spraying; (3) the heat preservation riser is re-coated with fused paraffin, and the wax mold is subjected to slurry hanging, sand spraying, dewaxing and sintering to prepare a corundum mold shell; and (4) the corundum mold shell is placed in a directional solidification furnace for solidification, and the single crystal high-temperature alloy rotating blades are prepared. According to the method, the supercooling degree of edge plates of the single crystal high-temperature alloy rotating blades can be greatly reduced, so that the formation of the impurity crystaldefects is reduced, the method has the characteristics of being simple in preparation process, low in cost and the like, so that the percent of pass of the single crystal high-temperature alloy rotating blades can be improved.

Description

Technical field: [0001] The invention relates to the technical field of preparation of superalloy single crystal blades, in particular to a method for preventing the formation of miscellaneous crystal defects in single crystal superalloy rotating blades. Background technique: [0002] Single crystal superalloy blades are key components in aero-engines, and the performance of the alloy plays a key role in the efficiency of the engine. With the increasing content of refractory elements such as W, Ta, Re, Ru in single crystal superalloys and the complexity of single crystal superalloy blades, the probability of solidification defects in cast single crystal superalloy blades increases, such as: single crystal The blades, especially the blades with complex structure single crystal superalloy blades, have side plate miscellaneous crystal defects (see figure 2 ). The qualification rate of single crystal superalloy blade production in my country is extremely low, about 1 / 4 to 1 / 5 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/08B22C9/22B22C9/04B22D27/04C30B11/00C30B29/52C22C19/05
CPCB22C9/04B22C9/088B22C9/22B22D27/045C22C19/057C30B11/00C30B29/52
Inventor 杨彦红梁静静孟杰周亦胄孙晓峰
Owner 辽宁红银金属有限公司
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