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Integral turbine orientated crystallization method

A directional crystallization and turbine technology, applied in the field of casting, can solve the problems of fine grains in key areas, failure to meet requirements, and high probability of turbine flying cracks.

Active Publication Date: 2005-10-05
WUXI POWER ENG
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Problems solved by technology

The directional crystallization of the overall turbine is still blank in China. Generally, bare shells or no shells are directly roasted, poured at a pouring temperature of 1400-1450 ° C, and directly air-cooled in the atmosphere after pouring, resulting in fine grains in key areas. The probability of flying cracks is high when running at high temperature and high speed for a long time
For specific crystal grains, see Figure 4 As shown, it can be seen from the figure that the grains on the blade are finely divided, and the average number of grain boundaries of the blade is A>1, which cannot meet the requirements

Method used

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  • Integral turbine orientated crystallization method
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  • Integral turbine orientated crystallization method

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Embodiment Construction

[0013] 1. Cladding: In order to strictly control the direction of heat flow during the solidification process of the alloy, so that the alloy liquid will always solidify along the expected direction, we wrap 1-10 mm of thermal insulation material 3 on the plane of the turbine big-end formwork 2, as shown in 2 As shown in the figure; 1 of them is the gating system.

[0014] 2. Box filling with sand: In order to form an effective temperature gradient at the solidification interface of the alloy, ensure that the metal grains at the blade grow toward the liquid phase along the direction opposite to the heat flow, and obtain oriented columnar crystals, use quartz sand outside the mold shell 5 filling, with insulation board 4 on the upper and lower sides. The specific method is shown in Figure 3;

[0015] 3. Roasting: In order to burn off volatile matter and moisture, increase the strength of the mold shell, and reduce the temperature difference when the molten metal is poured, the...

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Abstract

The directional crystallization method of one-piece turbine relates to a casting method of one-piece turbine, which includes the following steps: a. coating shell, coating large end plane of turbine mould shell with heat-insulating material whose thickness is 1-10 mm; b. boxing and sand-filling, placing the turbine mould shell into mould box, filling the mould box with quartz sand, bottom surface in the mould box and top surface of mould box adopt heat-insulating plate; firing temperature is 850-1300 deg.C; d. smelting, smelting nickel base alloy in equiaxial vacuum casting induction smelting furnace, pouring at 1450-1700 deg.C; and e. cooling, after it is poured, placing for 2-30 min. under the vacuum state.

Description

technical field [0001] The invention relates to casting technology, in particular to a casting method of an integral turbine. technical background [0002] Turbine is an indispensable key part in the supercharging technology of modern diesel engines. The high-performance turbocharger has a high-speed turbo rotation in a high-temperature environment of 650°C-700°C, and the speed reaches 150,000-170,000 rpm, or even exceeds 200,000 rpm , The blades of 0.5-1.5 mm have to withstand the impact of long-lasting high-temperature airflow and high-temperature stretching. Therefore, turbine blades must have sufficient high-temperature strength. In addition to using high-performance alloy materials, realizing directional crystallization on the turbine metallographic structure is an important measure to improve the high-temperature strength of turbine blades. The directional crystallization of the overall turbine is still blank in China. Generally, bare shells or no shells are directly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22D27/04
Inventor 耿瑞山黄伟
Owner WUXI POWER ENG
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