Cooling device in heat treatment of high-temperature alloy test bar

Abstract

The utility model relates to the technical field of high-temperature alloy heat treatment, and discloses a cooling device in heat treatment of a high-temperature alloy test bar, which comprises a base and a U-shaped blowing channel arranged on the base, a U-shaped blowing channel is arranged on the base, the U-shaped blowing channel is connected with the base through a supporting piece, a test bar support is further arranged on the base, the test bar support is located at the symmetrical center position of the U-shaped blowing channel, an air inlet of the U-shaped blowing channel is connected with a breather pipe, and a plurality of blowing holes are distributed in the inner ring wall of the U-shaped blowing channel. The cooling device can be used for rapidly and effectively cooling the high-temperature alloy test bar in heat treatment.

Description

Technical Field

[0001] The utility model relates to the technical field of heat treatment of superalloys, and particularly relates to a cooling device in the heat treatment of superalloy test bars. Background Art

[0002] In the current field of superalloy material manufacturing, the mechanical properties of materials determine the usage environment and service life of materials, especially in the fields of automobiles, chemical industry, gas turbines, aviation, etc., which are very widely used. Superalloy test bars are an important part in the research and development and production process of superalloy materials. Their functions are mainly reflected in testing and verifying the properties of materials, studying the behavioral characteristics of materials in different environments, providing a basis for material design and improvement, and ensuring the safety and reliability of materials under specific working conditions.

[0003] In order to obtain higher mechanical properties such as tensile strength and yield strength, it is necessary to perform solution and aging treatments (referred to as test bar heat treatment) on superalloy test bars. Test bar heat treatment is a metal hot working process. By means of heating, holding, and cooling, the internal tissue structure of materials is changed to achieve the expected performance and requirements, improve the mechanical properties of materials, eliminate residual stresses, improve the machinability of metals, and improve various properties of metal materials, such as strength, hardness, wear resistance, toughness, etc., so as to meet the performance requirements of products in various fields.

[0004] When conventional superalloy test bars are subjected to solution treatment and aging treatment using a vacuum heat treatment furnace, the solution temperature is generally between 950 - 1230 °C (the solution temperature and duration are specified according to the specific material grade), and the aging temperature is between 600 - 870 °C (the aging temperature and duration are specified according to the specific material grade). During the heat treatment process of superalloy test bars, water quenching and oil quenching are two common cooling methods. Both of these methods can be used to maintain the high-temperature strength of the alloy, but they each have their own advantages and disadvantages and are suitable for different situations and requirements. The advantage of water quenching is that it can quickly cool the alloy, increasing its hardness and strength. However, the disadvantage is that it is prone to cracking and deformation. The cooling rate of this method is very fast and is suitable for occasions where high hardness and strength are required, but the control requirements for cracking and deformation are not particularly strict. Oil quenching can avoid cracking and deformation, but the hardness and strength of the material are relatively low. The cooling rate of oil quenching is slower and is suitable for occasions where high requirements for cracking and deformation control are required, and the requirements for hardness and strength are not particularly high. Therefore, the choice between water quenching and oil quenching needs to be determined according to specific cooling requirements and the performance requirements of the alloy. Additionally, in practical applications, if the performance requirements of the alloy test bars are high and cracks, deformation, etc. are not allowed, generally methods such as taking out for natural cooling, furnace cooling, or air cooling are also adopted to cool the test bars, or artificial manual argon blowing is used to cool the test bars. These cooling methods are prone to unstable control, are greatly affected by humans, the environment, etc., the test bars are not cooled sufficiently, the internal grain sizes are inconsistent, and the grains will have time to continue growing, resulting in an increase in grain size. The grain size directly affects the mechanical properties and corrosion resistance of the material, easily leading to unqualified tensile properties or high-temperature creep properties of the test bars, and further resulting in the need to fabricate test bars multiple times and conduct heat treatment before performing mechanical testing again, increasing the testing costs and production costs. Moreover, production enterprises conduct performance testing according to production batches. Once batch unqualified occurs, test bars need to be produced again for retesting, extending the cycle, and seriously affecting the order delivery time. Therefore, a rapid and effective cooling method for test bars during heat treatment is needed. Summary of the Utility Model

[0005] Purpose of the Utility Model: Aiming at the problems existing in the prior art, the present utility model provides a cooling device for superalloy test bars during heat treatment, which can achieve rapid and effective cooling during the heat treatment process of superalloy test bars.

[0006] Technical solution: The utility model provides a cooling device in the heat treatment of a superalloy test bar, which includes: a base and a U-shaped air blowing channel arranged on the base; the U-shaped air blowing channel is connected to the base through a support member, and a test bar support is further arranged on the base. The test bar support is located at the symmetric center position of the U-shaped air blowing channel. An air inlet is arranged on the outer side wall of the U-shaped air blowing channel, and the air inlet is connected to a ventilation pipe. A plurality of air blowing holes are distributed on the inner side wall of the U-shaped air blowing channel.

[0007] Furthermore, the U-shaped end of the U-shaped air blowing channel is a closed end.

[0008] Furthermore, the air inlet of the U-shaped air blowing channel is located at the center position of the U-shaped bottom of the U-shaped air blowing channel.

[0009] Furthermore, a ball valve is arranged at the air inlet of the U-shaped air blowing channel, and the air inlet of the U-shaped air blowing channel is connected to the ventilation pipe through the ball valve.

[0010] Preferably, the air blowing holes are evenly distributed on the inner side wall of the U-shaped air blowing channel.

[0011] Beneficial effects: The cooling device in the heat treatment of the superalloy test bar provided by the utility model can realize rapid and effective cooling of the superalloy test bar during the heat treatment process, and further effectively refine the grain structure inside the test bar, enabling it to be cooled evenly and the grain size to be uniformized, improving the mechanical property indexes of the test bar detection. The specific beneficial effects are as follows:

[0012] (1) The air blowing channel of this device adopts a "U" shape design to form a surrounding cooling area, which can cool the test bar quickly and make the cooling of the test bar more uniform;

[0013] (2) The cooling speed of this device is relatively fast, and the cooling is completed within 2 minutes, and there is no oxidation and peeling on the surface of the test bar;

[0014] (3) By cooling the test bar with this device, it can ensure the stability of the performance detection values of the test bars of multiple batches of materials, the uniformity of the results, and reduce the occurrence of unqualified detections;

[0015] (5) This device can effectively reduce the production and detection costs and reduce the non-compliance of materials due to unqualified performance;

[0016] (6) This device is convenient to operate. After connecting the inert gas argon, just put the heat-treated superalloy test bar into the internal cooling area of the device;

[0017] (7) This device has a low manufacturing cost and can be reused. Description of the drawings

[0018] Figure 1Structural schematic diagram of a cooling device in the heat treatment of a superalloy test bar of the present utility model (the arrow in the figure indicates the flow direction of argon gas);

[0019] Figure 2 Physical diagram of a cooling device in the heat treatment of a superalloy test bar of the present utility model;

[0020] Figure 3 Flow chart of cooling a superalloy test bar by a cooling device in the heat treatment of a superalloy test bar of the present utility model;

[0021] Figure 4 Physical diagram of a superalloy test bar;

[0022] Figure 5 50x scanning electron microscope image of a superalloy test bar after being processed by a cooling device in the heat treatment of a superalloy test bar of the present utility model;

[0023] Figure 6 100x scanning electron microscope image of a superalloy test bar after being processed by a cooling device in the heat treatment of a superalloy test bar of the present utility model;

[0024] Illustration: 1. Base; 2. U-shaped blowing channel; 3. Test bar support; 4. Ball valve; 5. Vent pipe; 6. Support member; 7. Air inlet; 8. Superalloy test bar; 9. Blowing hole. Specific implementation mode

[0025] The present invention will be introduced in detail below in combination with the implementation mode.

[0026] Implementation mode 1:

[0027] This implementation mode provides a cooling device in the heat treatment of a superalloy test bar. The specific structure is as Figure 1As shown in the figure, the device includes a base 1, a U-shaped blowing channel 2 and a test bar support 3 arranged on the base 1. The base 1 and the U-shaped blowing channel 2 are connected by four support columns, which are welded and installed on the base 1. The symmetric center position of the U-shaped structure formed by the U-shaped blowing channel 2 is the test bar cooling area, and the test bar support 3 is installed in the test bar cooling area. Optionally, the base 1 is made of 45# steel plate with a thickness of 20 mm, the U-shaped blowing channel 2 is made of Ø30 mm stainless steel pipe, and the test bar support 3 is made of high-temperature resistant material (C50E75 material), and the test bar support 3 can withstand an environment of 1340 °C. The U-shaped ends of the U-shaped blowing channel 2 are closed ends. Blowing holes 9 are evenly distributed on the three inner side walls of the U-shaped blowing channel 2. An air inlet 7 is also provided at the center position of the U-shaped bottom on the outer side wall of the U-shaped blowing channel 2. The air inlet 7 of the U-shaped blowing channel 2 is connected to a ventilation pipe 5 through a ball valve 4. The ball valve 4 is used to control the flow rate of argon gas. One end of the ball valve 4 is connected to the ventilation pipe 5, and the ventilation pipe 5 is connected to an argon gas tank (cooling gas). Optionally, the blowing holes 9 are several Ø5 mm small holes, which are used as cooling blowing holes. The ventilation pipe 5 is a Ø12 mm plastic air pipe.

[0028] The cooling device for heat treatment of superalloy test bars provided by this embodiment is mainly used in the solution treatment stage. During the heat treatment process, the superalloy test bars are cooled. The manufacturing cost of this device is relatively low, and the use effect is good. It can quickly quench the test bars in the high-temperature state when they leave the furnace evenly.

[0029] When this device is in use, first, the superalloy test bars (the conventional test bar specifications are ø12 mm in diameter at both ends and ø6 mm in diameter at the gauge length) need to be placed on the heat treatment support, and then the whole is placed in a vacuum heat treatment furnace for high-temperature solution treatment (the solution temperature is between 1000 - 1230 °C). The solution temperature and duration are specified according to the specific material grade. Then, open the valve of the argon gas tank, and then open the ball valve, so that the cold argon in the argon gas tank quickly rushes into the U-shaped blowing channel through the ventilation pipe and blows out through several blowing holes on the inner side wall of the U-shaped blowing channel, forming a test bar cooling area at the symmetric center position of the U-shaped structure. Then, open the door of the vacuum heat treatment furnace, use a clamp to pick up the superalloy test bars in the high-temperature state that need to be cooled, and place them in the test bar cooling area formed at the symmetric center position of the U-shaped structure for cooling. Quick cooling for about 2 minutes. At this time, the superalloy test bars cool rapidly, the test bar grains have no time to continue growing, the internal grains are refined, and the structure is uniform. Finally, the cooled test bars are placed in the vacuum heat treatment furnace again for aging treatment. After the aging is completed, the test bars are taken out and cooled naturally (at this time, the internal grains of the test bars are uniformly refined, with high strength, hardness, wear resistance and toughness, etc., and the tensile performance and high-temperature creep performance are significantly enhanced, and higher mechanical parameters can be obtained).

[0030] Taking the aerospace standard superalloy K4169 as an example, Table 1 shows the specification performance standards of equiaxed crystal cast superalloy ingots for aero-engines in HB7763-2020, and Table 2 shows the mechanical properties of the superalloy materials processed by this device:

[0031] Table 1 Specification - Performance Standards of Equiaxed Crystal Cast Superalloy Ingots for Aero-Engines in HB7763-2020

[0032]

[0033] Table 2 Mechanical Properties of the Superalloy Materials Processed by this Device

[0034]

[0035] It can be seen from the results of the mechanical property parameters of the improved K4169 test bars in Table 2 that by cooling the superalloy materials in the heat treatment with this device, the tensile strength of the materials is significantly improved, the high-temperature creep rupture time is extended, and the elongation and reduction of area are significantly improved. In addition, Figure 5 This is the 50x scanning electron micrograph of the superalloy materials processed by this device, Figure 6 This is the 100x scanning electron micrograph of the superalloy materials processed by this device. It can be seen that the grain distribution of the test bars is uniform and the structure is dense.

[0036] The above embodiments are only for illustrating the technical concept and characteristics of the present invention, and their purpose is to enable those who are familiar with this technology to understand the content of the present invention and implement it accordingly, and should not be used to limit the protection scope of the present invention. Any equivalent transformation or modification made according to the spirit and essence of the present invention should be covered within the protection scope of the present invention.

Claims

1. A cooling device for heat treatment of a superalloy test bar, characterized in that, Including: A base and a U-shaped air blowing channel arranged on the base; the U-shaped air blowing channel is connected to the base through a support member, and a test bar bracket is further arranged on the base. The test bar bracket is located at the symmetric center position of the U-shaped air blowing channel. An air inlet is arranged on the outer side wall of the U-shaped air blowing channel, and the air inlet is connected to an air pipe. A plurality of air blowing holes are distributed on the inner side wall of the U-shaped air blowing channel.

2. The cooling device in the heat treatment of the superalloy test bar according to claim 1, wherein: The U-shaped end of the U-shaped air blowing channel is a closed end.

3. The cooling device in the heat treatment of the superalloy test bar according to claim 1, characterized in that: The air inlet of the U-shaped air blowing channel is located at the center position of the U-shaped bottom of the U-shaped air blowing channel.

4. The cooling device in the heat treatment of the superalloy test bar according to claim 1, characterized in that: A ball valve is arranged at the air inlet of the U-shaped air blowing channel, and the air inlet of the U-shaped air blowing channel is connected to the air pipe through the ball valve.

5. The cooling device in the heat treatment of the superalloy test bar according to claim 1, wherein: The air blowing holes are evenly distributed on the inner side wall of the U-shaped air blowing channel.

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