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High-temperature alloy fluidity test mold and preparation method of test sample

A technology for superalloys and test molds, which is applied in the preparation of test samples and other directions, and can solve the problems of inapplicability to the fluidity test of superalloys, low test temperature, and large test space.

Pending Publication Date: 2022-04-05
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Chinese patent CN2389363Y discloses the appearance of testing the fluidity of the alloy, but the flow groove is radially linear, the required test space is large, and the test environment is non-vacuum
[0005] Chinese patent CN103424338B discloses a non-ferrous alloy casting fluidity test metal mold, which adopts a single spiral flow channel, but the test object is low melting point alloys such as magnesium and aluminum, the test temperature is low, and the environment is non-vacuum conditions, so it is not suitable for Fluidity Test of Superalloys under Vacuum Casting Conditions

Method used

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  • High-temperature alloy fluidity test mold and preparation method of test sample

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preparation example Construction

[0086] In the present invention, the preparation method of the superalloy fluidity test mold preferably includes the following steps:

[0087] Wax hanging the investment pattern assembly to obtain a wax model, the investment pattern assembly includes a sprue cup 6 assembly, a sprue 7 assembly, a spiral flow channel 4 assembly and a sprue nest 5 assembly, or a sprue cup 6, a sprue A molded component in which the runner 7, the spiral flow channel 4 and the gate nest 5 are integrally formed;

[0088] Coating the surface of the wax pattern in the order of the inner layer, the first middle layer, the second middle layer, the third middle layer and the surface layer to obtain a negative shell wax pattern;

[0089] The negative shell wax mold is dewaxed and baked in sequence to obtain the superalloy fluidity test mold.

[0090] In the present invention, the investment pattern assembly is hanged with wax to obtain a wax model, and the investment pattern assembly includes a sprue cup ...

Embodiment 1

[0120] use figure 1 Said superalloy fluidity test mold, wherein, the spiral flow channel 4 is composed of a section of equal height flow channel, the height h and width s are 25mm and 3mm respectively (h:s=8.33), and the length l is 975mm. Through this mold, the fluidity of superalloy K4169 was measured when the pouring temperature was 1470°C and the mold temperature was 1100°C. The structure of the mold see figure 1 , the expansion diagram of the spiral flow channel 4 is shown in Figure 4 a.

[0121] The liquidity test steps are as follows:

[0122] Put the mold into a box-type resistance furnace, then turn on the heating body, wait for the temperature to rise to 900°C, keep it warm for 10 minutes, and then increase the temperature to 1100°C at a rate of 10°C / min.

[0123] Put the preheated mold into the vacuum induction furnace, and evacuate the vacuum induction furnace to 10 -2 pa, turn on the power to heat the superalloy K4169, and when the superalloy K4169 is dark r...

Embodiment 2

[0128] use figure 1 The high-temperature alloy fluidity testing mold, wherein, the spiral flow channel 4 is composed of a gradually changing high flow channel, the height of the inlet end of the spiral flow channel 4 is 25mm, and the height of the outlet end is 10mm, and the spiral flow channel 4 The height of the spiral flow channel 4 gradually changes according to a linear equation; the width of the spiral flow channel 4 is preferably 4mm, and the ratio of the height to the width of the spiral flow channel 4 is 2.5-6.25. The fluidity of the superalloy K4169 at the pouring temperature of 1470°C and the mold temperature of 900°C was measured through the mold. The structure of the mold see figure 1 , the expansion diagram of the spiral flow channel 4 is shown in Figure 4 b.

[0129] The liquidity test steps are as follows:

[0130] Put the mold into a box-type resistance furnace, then turn on the heating body, wait for the temperature to rise to 900°C, and keep it warm for...

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Abstract

The invention relates to the technical field of high-temperature alloy casting performance detection, in particular to a high-temperature alloy fluidity testing mold and a testing method. According to the test mold provided by the invention, a spiral flow channel is expanded in the radial direction of a sprue according to an asymptote equation as shown in a formula 1, and the total length of the spiral flow channel is controlled to be smaller than or equal to 980 mm; the testing accuracy can be guaranteed, and meanwhile it is guaranteed that the high-temperature alloy fluidity testing mold has the small size in the length dimension and the width dimension. Meanwhile, the height of the pouring cup is smaller than or equal to 50 mm; the height of the sprue is less than or equal to 100mm; and it is ensured that the high-temperature alloy fluidity testing mold has a small size in the height dimension. The inner layer of the test mold provided by the invention is made of a mixture of silica sol and fused mullite. The high-temperature alloy flowability testing mold provided by the invention is small in size, and the flowability of the high-temperature alloy can be tested in a vacuum furnace.

Description

technical field [0001] The invention relates to the technical field of high-temperature alloy casting performance detection, in particular to a high-temperature alloy fluidity test mold and a method for preparing a test sample. Background technique [0002] In the casting process, the fluidity of molten metal is usually used as the evaluation standard for alloy casting performance. Generally speaking, the fluidity of the alloy is good, which is conducive to the filling and shrinkage of the alloy melt, and it is convenient to produce compact parts with accurate shape, size, clear outline and excellent mechanical properties. Poor fluidity will lead to casting defects such as "under-pouring", "cold shut", and "shrinkage shrinkage cavity" on the casting, resulting in a reduction in the yield of the casting. [0003] As the structure of the key hot-end parts of the aero-engine develops towards the overall and thin-walled direction, the filling of the alloy becomes more difficult...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/36
Inventor 张军介子奇刘淼楠郭敏刘林
Owner NORTHWESTERN POLYTECHNICAL UNIV