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Method for improving temperature distribution in process of single crystal casting solidification

A temperature distribution and casting technology, applied in the direction of self-solidification, single crystal growth, single crystal growth, etc., can solve the problems of large undercooling, hinder the growth and expansion of single crystal, destroy the single crystallinity of the blade, etc., and achieve an optimized temperature field. Distribution, application implementation is simple and easy, and the effect of ensuring smooth growth and expansion

Inactive Publication Date: 2009-09-23
JIANGSU UNIV
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  • Claims
  • Application Information

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Problems solved by technology

This hot node hinders the expansion of the single crystal growth of the blade itself to B at the edge of the leaf crown, making the supercooling degree at B larger and larger, and finally leads to the nucleation and growth of the second crystal grain, destroying the single crystal growth of the entire blade. crystallinity

Method used

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  • Method for improving temperature distribution in process of single crystal casting solidification
  • Method for improving temperature distribution in process of single crystal casting solidification
  • Method for improving temperature distribution in process of single crystal casting solidification

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Embodiment

[0021] Apply the technology of the present invention to the casting of a single crystal blade, the blade length is 150mm, the material is CMSX6, and the structure of the ceramic formwork is shown in the attached figure 2 .

[0022] attached image 3 In the actual solidification process of the ceramic mold shell, T1=2105s and t2=2190s time T L - Isotherm distribution. Among them, the picture in (a) shows the T during the solidification process in the ceramic mold shell without implanting the thermal conductor. L -Isotherm; (b) The picture shows the T during the solidification process in the ceramic mold shell under the condition of implanting a heat conductor L -Isotherm. Obviously, the liquidus (T L ) isotherm due to the effect of thermal conductors, becomes obviously flat from concave. The degree of supercooling at the edge is reduced from 29°C to 18°C, and the supercooling time is reduced from 244 seconds to 150 seconds, which greatly reduces the possibility of formin...

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Abstract

The invention discloses a method for improving temperature distribution in a process of single crystal casting solidification, relating to the field of high-temperature alloy directional solidification. In a process of preparing molten mould casting ceramic mould shell, and in a process of implanting a heat conductor into a casting to be solidified and transfer heat to the external, a position with thermal barrier is easy to occur. The heat conductor is graphite or SiC. Practical use shows that by applying the technology, an undercooling difference and an undercooling time difference in the casting can be greatly reduced, thereby the probability of generating stray crystals is obviously reduced, and the single crystal qualified rate of the casting is greatly enhanced.

Description

technical field [0001] The invention relates to the field of directional solidification of superalloys, in particular to a method for improving the temperature distribution in the solidification process of single crystal castings. Background technique [0002] Since the 1950s, in order to improve the function and efficiency of aero-engines, people have successfully used superalloy directional solidification technology to make turbine blades into single crystal form. Due to the elimination of the grain boundary, the weak link under high-temperature working conditions, the high-temperature working life of the blade is increased by dozens of times. In the past two decades, with the increasing urgency of energy and environmental protection issues, all industrialized countries are working to improve the efficiency of industrial gas turbines, especially power plant gas turbines. One of the most important measures is to apply the single crystal blade technology of aero-engines to ...

Claims

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Application Information

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IPC IPC(8): B22D27/04C30B11/00C30B29/52
Inventor 赵玉涛马德新孙少纯
Owner JIANGSU UNIV
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