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Method for evaluating temperature field distribution in orientated solidification process

A technology of directional solidification and temperature field, which is applied in the field of investment casting, can solve the problems of difficult to accurately reflect the symmetry of temperature field distribution, and achieve the effect of easy popularization and application, low cost and easy casting.

Inactive Publication Date: 2013-01-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

Therefore, the greatest advantage of the present invention is that it does not need to directly measure the temperature value, and solves the engineering problem that the symmetry of the temperature field distribution in the directional solidification furnace is difficult to accurately reflect

Method used

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  • Method for evaluating temperature field distribution in orientated solidification process
  • Method for evaluating temperature field distribution in orientated solidification process
  • Method for evaluating temperature field distribution in orientated solidification process

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Embodiment

[0038] figure 2 It is the dendrite growth mode in the bottom cross-section of the fifth outer platform (from bottom to top) of SRR99 alloy. The original dendrites in the leaf body branched along two paths in the platform. Path 1: A-B-C1-D1; Path 2: A-B-C2. A refers to the area of ​​the original dendrite in the leaf body; B refers to the branching area of ​​the secondary dendrite arm of the original dendrite in the platform; C1 refers to the tertiary branching area perpendicular to the left edge of the platform; C2 refers to the branching area perpendicular to the right edge of the platform Tertiary branching area; D1 refers to the fourth branching area from the left and outer edges of the platform. It can be seen that the number and area of ​​the branch regions corresponding to the two branch paths are different. The number of branched regions along path 1 is small and the area of ​​branched regions is small, which indicates that the temperature field distribution around th...

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Abstract

The invention relates to an investment casting technology, in particular to a method for evaluating temperature field distribution in an orientated solidification process. The method comprises the following steps of: designing a mold of the same platform size, symmetrically assembling wax patterns pressed by using the mold in a module by adopting a specific crystallographic orientated seed crystal, and casting a specifically-orientated mono-crystal casting; and qualitatively evaluating the temperature field distribution situation through a rule that the temperature field distribution is more uniform when corresponding branched areas on the left and right sides of a platform are more symmetrical. According to the method, the temperature field distribution situation in the orientated solidification process can be represented qualitatively under the condition of not measuring the temperature field distribution in the orientated solidification process by using a temperature measuring instrument. Due to the adoption of the method, the problem of difficulty in accurately evaluating the temperature field distribution in the orientated solidification process can be solved, and bases are provided for qualitative judgment of the temperature field distribution situation in the orientated solidification process in practical production.

Description

technical field [0001] The invention relates to investment casting technology, in particular to a method for evaluating temperature field distribution in a directional solidification process. Background technique [0002] During the directional solidification process, the temperature field distribution is the key factor for the successful preparation of single crystal superalloy blades. The more symmetrical the temperature field distribution, the easier it is to successfully prepare single crystal blades. Since the directional solidification furnace operates under harsh conditions of high temperature and vacuum, it is difficult to accurately measure the temperature distribution in the directional solidification furnace. [0003] At present, the commonly used methods for temperature data acquisition in directional solidification furnaces are as follows: pre-built horizontally placed (inner end sealed) ceramic tubes in different positions of the ceramic mold shell, insert a th...

Claims

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Application Information

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IPC IPC(8): G01K11/00B22C9/04B22D1/00C30B11/00
Inventor 张小丽周亦胄金涛孙晓峰
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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