A Method for Reducing Microporosity in Cast Superalloy Test Bar

A micro-porosity technology for high-temperature alloys, which is applied to casting molding equipment, casting molds, and casting mold components. It can solve problems such as unfavorable superalloy liquid feeding in time, failure to reflect mechanical properties, and excessive heat dissipation on the surface of test rods. , to achieve the effect of reducing micro-porosity defects, reducing non-metallic inclusions, and ensuring consistency

Active Publication Date: 2017-06-13
SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to problems such as too long feeding channel of the test rod, insufficient thickness of the upper disk of the pouring system, and excessive heat dissipation on the surface of the test rod, the feeding of the superalloy liquid during the pouring process of the test rod is insufficient, which is not conducive to the optimum performance of the test rod. Fine parts - timely feeding of the superalloy liquid in the stretching section, resulting in microscopic looseness of the test rod, which cannot reflect the real mechanical properties

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  • A Method for Reducing Microporosity in Cast Superalloy Test Bar
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  • A Method for Reducing Microporosity in Cast Superalloy Test Bar

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Embodiment 1

[0028] In this embodiment, taking the K424 alloy as an example, the method for reducing the microporosity in the cast superalloy test rod is carried out according to the following steps:

[0029] (1) Prepare the wax mold of the dumbbell-shaped superalloy test rod, increase the diameter of the tensile section of the wax mold of the dumbbell-shaped superalloy test rod, shorten the length of the stretching section, and make the angle of the feeding channel angle at 18°, such as figure 1 As shown, then prepare the dumbbell-shaped superalloy test rod shell;

[0030] (2) Combined superalloy test bar pouring device, such as figure 2 As shown, the dumbbell-shaped superalloy test rod shell is installed between the upper disc and the lower disc, wherein the thickness of the upper disc is 20mm, and a sprue cup is arranged above the upper disc, and placed at the bottom of the sprue cup A ceramic foam filter screen with a porosity of 24PPI and a height of 15mm is wrapped with three layer...

Embodiment 2

[0035]In this embodiment, taking the K424 alloy as an example, the method for reducing the microporosity in the cast superalloy test rod is carried out according to the following steps:

[0036] (1) To prepare a wax mold of a dumbbell-shaped superalloy test rod, increase the diameter of the stretched section of the wax mold of the dumbbell-shaped superalloy test rod, shorten the length of the stretched section, and make the angle of the feeding channel angle 20°, such as figure 1 As shown, then prepare the dumbbell-shaped superalloy test rod shell;

[0037] (2) Combined superalloy test bar pouring device, such as figure 2 As shown, the dumbbell-shaped high-temperature alloy test rod shell is installed between the upper disc and the lower disc, wherein the thickness of the upper disc is 30mm, and a sprue cup is arranged above the upper disc, and placed at the bottom of the sprue cup A foam ceramic filter screen with a porosity of 22PPI and a height of 10mmmm is wrapped with t...

Embodiment 3

[0042] In this embodiment, taking the K424 alloy as an example, the method for reducing the microporosity in the cast superalloy test rod is carried out according to the following steps:

[0043] (1) Prepare the wax mold of the dumbbell-shaped superalloy test rod, increase the diameter of the tensile section of the wax mold of the dumbbell-shaped superalloy test rod, shorten the length of the tensile section, and make the angle of the feeding channel angle at 25°, such as figure 1 As shown, then prepare the dumbbell-shaped superalloy test rod shell;

[0044] (2) Combined superalloy test bar pouring device, such as figure 2 As shown, the dumbbell-shaped superalloy test rod shell is installed between the upper disc and the lower disc, wherein the thickness of the upper disc is 25mm, and a sprue cup is arranged above the upper disc, and placed at the bottom of the sprue cup A foam ceramic filter screen with a porosity of 20PPI and a height of 12mm is wrapped with three layers o...

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Abstract

The invention belongs to the technical field of precision casting and particularly relates to a method for reducing microporosity during casting of a high-temperature alloy test bar. According to the method, by enlarging a feeding channel of molten steel in the test bar pouring process, the pouring temperature and a mode of heat dissipation of the test bar are improved, too quick solidification on the surface of the test bar is reduced, and the feeding effect of a pouring system is improved. The smoothness of the feeding channel of a test bar detection part is achieved, the microporosity defect in the middle of the test bar is completely introduced into the pouring system, and the microporosity caused by too many impurities in alloy liquid is reduced by utilizing a filtering system.

Description

technical field [0001] The invention belongs to the technical field of precision casting, and in particular relates to a method for reducing microporosity in cast superalloy test rods. Background technique [0002] Most of the high-temperature alloy castings need to be tested to see if the mechanical properties meet the specification requirements. Usually, the performance test is to use the high-temperature alloy to make a single-cast test bar to reflect the mechanical properties of the alloy. Due to the high degree of alloying of superalloys, the solidus and liquidus temperature ranges of the alloys are usually wide. Generally, the temperature ranges from tens of degrees to hundreds of degrees. The larger the solid-liquid temperature range, the alloy forms a microscopic The looser tendency is greater. At the usual test bar pouring temperature, due to the combined structure of the test bar, preheating conditions, preheating temperature, and pouring temperature, there are la...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22C9/04B22C9/08
Inventor 王宇飞满延林杨刚尚伟徐博
Owner SHENYANG LIMING AERO-ENGINE GROUP CORPORATION
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