In-situ observation device and method for anti-gravity mold filling and solidification process of high-temperature alloy

Abstract

The invention provides an in-situ observation device and method for the anti-gravity mold filling and solidification process of a high-temperature alloy, and the device comprises a melt casting mold mechanism which comprises a quartz plate cavity, a melt groove and a casting mold; x-rays of the synchrotron radiation light source irradiate the center of the casting mold through the casting mold observation window; the heating mechanism is used for heating the high-temperature alloy to form an alloy melt and heating the casting mold; the temperature measuring mechanism is used for measuring the temperature of the alloy melt and the casting mold; the pressure adjusting mechanism applies pressure to the upper sealing chamber and the lower sealing chamber at the same time, the alloy melt is pressed into the casting mold from bottom to top through the pressure difference between the upper sealing chamber and the lower sealing chamber, and after the casting mold is full, the pressure difference between the upper sealing chamber and the lower sealing chamber is kept constant till casting solidification is completed; and the detector is used for acquiring signals of real-time mold filling and solidification behaviors of the alloy melt. According to the invention, the influence of pressure regulating process parameters on the anti-gravity casting forming performance can be studied, and in-situ observation of the filling and solidification process of the alloy melt in the casting mold is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of high-temperature alloy counter-gravity casting, and in particular to an in-situ observation device and method for the counter-gravity filling and solidification process of a high-temperature alloy. Background Art

[0002] Counter-gravity casting is a casting method that adjusts the pressure difference between the upper and lower tanks to allow the alloy liquid to fill the mold from bottom to top and solidify in the opposite direction of gravity. The advantages of counter-gravity casting are: smooth filling and controllable rate, rapid cooling and adjustable temperature field, solidification under pressure and conducive to solidification and shrinkage compensation of castings, so the castings have high mechanical properties, dense structure, and few casting defects; especially for the filling of thin-walled parts, precise pressure control is added to allow the alloy melt to enter the ultra-thin wall cavity. Counter-gravity casting can achieve transient pressure build-up and precise pressure application, which is conducive to obtaining thin-walled castings with complex shapes and clear contours. However, the counter-gravity casting device is suitable for a relatively single type of alloys during the experiment, mainly involving low-melting point alloys such as aluminum alloys, and it is difficult to achieve research on high-temperature alloys. At present, anti-gravity casting is basically a large-scale equipment, which has high construction cost, large space occupation, inconvenient movement, and cannot be used for large-scale in-situ observation experimental research of anti-gravity casting; and due to the complex internal structure and opacity during the experiment, it is impossible to observe the filling and solidification process of the metal liquid in the mold through conventional experimental means; limited by the complex anti-gravity operation process and numerous process parameters, it cannot meet the current development needs of precision castings. Therefore, how to design a multifunctional anti-gravity casting device with a simple structure and easy to realize in-situ observation is a key technical problem that needs to be solved urgently.

[0003] Synchrotron radiation X-rays can achieve high-precision detection and calibration of the microstructure and structure of alloy materials. They can be used for phase analysis and texture analysis in material structures, and can also achieve real-time observation of microscopic dynamic changes in materials. Among them, synchrotron radiation imaging technology has significant advantages in the field of metal material research due to its strong penetration, high temporal and spatial resolution, non-destructiveness, and visualization, and can directly observe the metal solidification process. Therefore, it is of great significance to use synchrotron radiation in-situ characterization technology to explore the anti-gravity filling and solidification process of high-temperature alloys.

[0004] The search found:

[0005] The Chinese invention patent with application publication number CN114226690A discloses a control method and casting device for differential pressure casting of aluminum alloys. The patent mainly relates to differential pressure casting of aluminum alloys. The alloy types are relatively single, and only a single material medium-temperature alloy aluminum alloy can be regulated, while other high-melting point alloys (such as high-temperature alloys) cannot be regulated by differential pressure casting. The device has a complex structure and operation, and it is impossible to install it on a synchrotron radiation line station to observe the filling and solidification of the internal alloy with a synchrotron radiation light source.

[0006] The Chinese invention patent with application publication number CN117773070A discloses an anti-gravity casting device and method, an in-situ observation device and method. The high-temperature alloy is heated, filled and solidified in the air. The motor at the lower end of the device drives the push rod to move from bottom to top, thereby adjusting the pressure on the push rod. Since the pressure is adjusted by the push rod, the structure and operation are relatively complicated.

[0007] The anti-gravity devices disclosed in the prior art, although achieving multifunctional casting applications, still fail to solve the above-mentioned problems. Summary of the invention

[0008] In view of the defects in the prior art, the object of the present invention is to provide an in-situ observation device and method for the anti-gravity filling and solidification process of a high-temperature alloy.

[0009] According to one aspect of the present invention, there is provided an in-situ observation device for anti-gravity filling and solidification process of a high-temperature alloy, comprising:

[0010] The melt casting mechanism comprises a quartz plate cavity, a melt tank and a casting mold arranged in the quartz plate cavity, wherein the casting mold is located above the melt tank; a casting mold observation window is arranged on the quartz plate cavity, and X-rays from a synchrotron radiation light source are irradiated on the center of the casting mold through the casting mold observation window;

[0011] A heating mechanism, used for heating the high temperature alloy to form an alloy melt, and for heating the casting mold;

[0012] A temperature measuring mechanism, used for measuring the temperature of the alloy melt and the casting mold;

[0013] A pressure regulating mechanism, wherein the pressure regulating mechanism applies pressure to the upper sealed chamber and the lower sealed chamber of the melt casting mechanism at the same time, thereby forming a pressure difference between the upper sealed chamber and the lower sealed chamber, and utilizing the pressure difference to press the alloy melt into the casting from bottom to top. After the casting is filled, the pressure difference between the upper sealed chamber and the lower sealed chamber is kept constant until the casting is solidified;

[0014] The detector obtains signals of the real-time filling and solidification behaviors of the alloy melt under the irradiation of the synchrotron radiation light source, thereby realizing in-situ observation of the anti-gravity filling and solidification processes of the high-temperature alloy.

[0015] Furthermore, both upper and lower ends of the quartz plate cavity are provided with vents, and the vents are connected to the pressure regulating mechanism;

[0016] The melt casting mechanism comprises two quartz plate clamps, which are aligned, tightened and sealed to form a sealed whole.

[0017] Furthermore, the thickness of the casting mold is less than 0.50 mm.

[0018] Furthermore, the heating mechanism is an induction heating device, which is placed directly below the mold, and the height of the induction coil of the induction heating device is not less than the height of the melt tank.

[0019] Furthermore, the induction heating temperature of the induction heating device can reach up to 2000°C.

[0020] Furthermore, the temperature measuring mechanism comprises:

[0021] a first thermocouple, the first thermocouple being in contact with the outer surface of the melt tank and being used to measure the temperature of the alloy melt;

[0022] A second thermocouple, wherein a temperature measuring hole is provided on the quartz plate cavity, the position of the temperature measuring hole corresponds to the casting mold, and the second thermocouple is located in the temperature measuring hole and is used to measure the temperature at the casting mold position;

[0023] A temperature controller is used to display the measurement results of the first thermocouple and the second thermocouple.

[0024] Furthermore, the voltage regulating mechanism comprises:

[0025] Gas cylinders, used to provide inert gas;

[0026] A first ventilation pipe, one end of which is connected to the gas cylinder, and the other end of which is connected to the upper ventilation port of the quartz plate cavity;

[0027] A second ventilation pipe, one end of which is connected to the gas cylinder, and the other end of which is connected to the lower end ventilation port of the quartz plate cavity;

[0028] The first ventilation pipe and the second ventilation pipe are both provided with air valves.

[0029] According to another aspect of the present invention, a method for in-situ observation of the counter-gravity filling and solidification process of a high-temperature alloy is provided, which is implemented by using the above-mentioned in-situ observation device for the counter-gravity filling and solidification process of a high-temperature alloy. The method comprises:

[0030] The device is placed on the beamline of the synchrotron radiation source so that the X-rays are irradiated at the center of the mold;

[0031] The block-shaped high-temperature alloy to be observed is placed in the melt tank, and then the melt casting mechanism is sealed, and the heating mechanism is sheathed on the outside of the quartz plate cavity;

[0032] Connect the upper and lower vents of the quartz plate cavity to the pressure regulating mechanism to form a connected closed space;

[0033] The high temperature alloy is heated by a heating mechanism to form an alloy melt, and the casting mold is heated, and the temperature of the alloy melt and the casting mold is monitored in real time by a temperature measuring mechanism;

[0034] When the pouring temperature and the mold temperature both reach the preset temperature, the pressure regulating mechanism is turned on, and an inert gas medium of a predetermined pressure is introduced into the upper and lower sealed chambers. After reaching equilibrium, pressure is applied to the upper and lower sealed chambers at the same time, forming a pressure difference between the upper and lower sealed chambers, and pressing the alloy melt into the mold from bottom to top. After the mold is filled, the pressure difference between the upper and lower sealed chambers is kept constant until the casting is solidified;

[0035] The detector collects the signals corresponding to the real-time filling and solidification behavior of the alloy melt, thereby realizing in-situ observation of the anti-gravity filling and solidification process of the high-temperature alloy.

[0036] Furthermore, the collecting of signals corresponding to the real-time filling and solidification behaviors of the alloy melt by the detector includes: using an imaging detector to collect transmission signals of a synchrotron radiation light source, processing the transmission signals to form an image, and observing the solidification process based on the imaging results.

[0037] Furthermore, the collecting of signals corresponding to the real-time filling and solidification behaviors of the alloy melt by the detector includes: using a diffraction signal detector to collect diffraction signals of a synchrotron radiation light source to achieve real-time analysis of phase precipitation and phase transformation during the anti-gravity solidification process.

[0038] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0039] 1. The present invention realizes in-situ observation of the anti-gravity filling and solidification behavior of the high-temperature alloy melt under pressure by the mutual cooperation between the melt casting mechanism, the heating mechanism, the temperature measuring mechanism and the pressure regulating mechanism, and by combining with the synchrotron radiation technology, so as to realize the in-situ observation of the filling and solidification process of the alloy melt in the casting mold, and can study the influence of the pressure regulating process parameters on the anti-gravity casting alloy, which plays an important role in optimizing the anti-gravity casting technology. Moreover, the device has a simple structure, the equipment runs safely and reliably, is economical and environmentally friendly, and the device can be reused, and a large number of in-situ experimental studies on micro anti-gravity casting can be carried out, which is conducive to solving the key problem of coordinated control of filling and solidification in the field of anti-gravity casting.

[0040] 2. The present invention realizes intelligent feedback regulation of high-temperature alloy melting and melt filling and solidification process. The whole device can achieve a wider operating temperature and can be applied to low, medium and high temperature alloys. It also simplifies the traditional anti-gravity device, making micro pressure-regulated casting more convenient and safer, and easier to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0042] Figure 1 It is a schematic structural diagram of an in-situ observation device for the anti-gravity filling and solidification process of a high-temperature alloy in one embodiment of the present invention;

[0043] Figure 2 It is a schematic structural diagram of a melt casting mechanism in one embodiment of the present invention.

[0044] The corresponding numbers in the drawings are: 1 is a melt casting mechanism, 11 is a casting mold, 12 is a melt tank, 2 is a heating mechanism, 31 is a first thermocouple, 32 is a second thermocouple, 33 is a temperature measuring hole, 41 is a gas cylinder, 42 is a first gas valve, 43 is a first ventilation pipe, 44 is a second ventilation pipe, 45 is a second gas valve, 46 is a third gas valve, and 5 is a detector. DETAILED DESCRIPTION

[0045] The present invention is described in detail below in conjunction with specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those of ordinary skill in the art, several variations and improvements may be made without departing from the concept of the present invention. These all belong to the protection scope of the present invention.

[0046] An embodiment of the present invention provides an in-situ observation device for the anti-gravity filling and solidification process of a high-temperature alloy, referring to Figure 1 and Figure 2The device comprises a melt casting mechanism 1, a heating mechanism 2, a temperature measuring mechanism, a pressure regulating mechanism and a detector 5, wherein: the melt casting mechanism 1 comprises a quartz plate cavity, a melt tank 12 and a casting mold 11 arranged in the quartz plate cavity, the quartz plate cavity is divided into an upper sealing chamber and a lower sealing chamber in the vertical direction, and the casting mold 11 is located above the melt tank 12; a casting mold observation window is provided on the quartz plate cavity, and when observing in situ, the device is placed on the line station of the synchrotron radiation light source, and the X-rays of the synchrotron radiation light source are always irradiated on the center position of the casting mold 11 through the casting mold observation window; the heating mechanism 2 is used to heat and shape the high-temperature alloy The alloy melt is formed, and the mold 11 is heated; the temperature measuring mechanism is used to measure the temperature of the alloy melt and the mold 11; the pressure regulating mechanism applies pressure to the upper sealed chamber and the lower sealed chamber of the melt casting mechanism 1 at the same time, and a pressure difference is formed between the upper sealed chamber and the lower sealed chamber. The alloy melt is pressed into the mold 11 from bottom to top by using the pressure difference. After the mold 11 is filled, the pressure difference between the upper sealed chamber and the lower sealed chamber is kept constant until the casting is solidified; the detector 5 obtains the signal of the real-time filling and solidification behavior of the alloy melt under the irradiation of the synchrotron radiation light source, and realizes the in-situ observation of the anti-gravity filling and solidification process of the high-temperature alloy. Therefore, the influence of the pressure regulating process parameters on the anti-gravity casting forming performance can be studied, and the in-situ observation of the filling and solidification process of the alloy melt in the mold 11 can be realized.

[0047] The embodiment of the present invention can realize the counter-gravity filling and solidification of the high-temperature alloy under external pressure through the mutual cooperation between the melt casting mechanism 1, the heating mechanism 2, the temperature measuring mechanism, the pressure regulating mechanism, etc.; in conjunction with the synchrotron radiation technology, it can realize the in-situ observation of the counter-gravity filling and solidification process of the high-temperature alloy under pressure.

[0048] In some embodiments, both the upper and lower ends of the quartz sheet cavity have vents, and the vents are connected to the pressure regulating mechanism through vent pipes. Exemplarily, the vent pipe is a rubber vent pipe; the melt casting mechanism 1 includes two quartz sheet plate clamps (i.e., sealing sheets), the two clamps are aligned, overlapped and tightened, and then a layer of sealant is applied to the leak to make it sealed, and then the upper and lower vent pipes are tightened to form a sealed whole. The upper sealing chamber and the lower sealing chamber of the melt casting mechanism 1 are formed between the two quartz sheet plate clamps, and the two are an integral whole in the length direction of the quartz sheet plate clamps and cannot be separated to form an integrated structure. When performing counter-gravity casting, the block high-temperature alloy is first placed in the melt tank 12. The size of the block high-temperature alloy is slightly smaller than the melt tank 12. After the block high-temperature alloy is placed, the two quartz sheet plate clamps are tightened, and then a layer of sealant is applied to the leak to seal the melt casting mechanism 1 (in order to facilitate the internal structure, Figure 1 and Figure 2The melt casting mechanism does not show another quartz plate clamp); the upper and lower vents are tightened to form a sealed whole to isolate the alloy from the outside air. The sample formed by the casting mold 11 is made into a thin piece for studying the thin piece structure. At the same time, the thickness of the thin piece sample must meet the requirements of synchrotron radiation light transmission for in-situ observation. Preferably, the thickness of the casting mold 11 is less than 0.50 mm. The casting mold 11 has a trapezoidal structure, and the cross-sectional area gradually decreases from bottom to top, such as Figure 2 Its cross section is a three-level trapezoidal structure. According to the spot size of the synchrotron radiation source, the three-level trapezoidal structure can be used to study the differences in the solidification structures of melts of different areas, as well as the differences in the molding structures at different solidification temperatures. The specific structure and size of the trapezoidal structure can be changed accordingly according to the actual situation. For example, it can be a triangle, rectangle or parallelogram, etc., which can reproduce the actual production conditions. Therefore, it is possible to reflect large-scale casting phenomena through small-scale research, and the mold after molding can be reused repeatedly.

[0049] In some embodiments, the heating mechanism 2 is an induction heating device, and the induction heating temperature of the induction heating device can reach up to 2000°C. The induction heating device is placed directly below the mold 11, and the heating mechanism 2 is placed outside the quartz plate. The position of the induction coil of the induction heating device completely wraps the melt tank 12, heats the alloy (i.e., the metal to be melted) to melt it, forms a metal melt in the melt tank 12, and heats the mold 11; and the uppermost end of the induction coil of the induction heating device is kept at an appropriate distance from the lowermost end of the mold 11, the quartz plate cavity is heated in the induction coil, the induction coil does not contact the quartz plate cavity, and the inner diameter of the induction coil of the induction heating device is slightly larger than the width of the quartz plate cavity, and the height is not less than the height of the melt tank 12. The metal to be melted is placed in the melt tank 12 in the center of the induction coil to ensure that the metal to be melted can be completely melted. Exemplarily, the inner diameter of the induction coil is 13 mm and the height is 20 mm; the length of the quartz plate cavity is 100 mm, the width is 10 mm and the height is 2 mm; the length of the melt tank 12 is 10 mm, the width is 4 mm and the depth is 1 mm.

[0050] In some embodiments, the temperature measuring mechanism includes a first thermocouple 31, a second thermocouple 32 and a temperature controller. The first thermocouple 31 contacts the outer surface of the melt tank 12 through an induction heating device, and is used to measure the temperature of the alloy melt or the melt tank 12; the second thermocouple 32 does not contact the induction heating device, and measures the pouring temperature of the molten metal. A temperature measuring hole 33 is provided on the quartz plate cavity, and the position of the temperature measuring hole 33 corresponds to the casting mold 11. The second thermocouple 32 is inserted into the temperature measuring hole 33 on the quartz plate cavity, and is used to measure the temperature at the position of the casting mold 11; the temperature controller is used to display the measurement results of the first thermocouple 31 and the second thermocouple 32. The thermocouple and the induction heating device of the temperature measuring mechanism can accurately control the melting of the alloy and the casting temperature. All thermocouples use B-type thermocouples, which are platinum-rhodium type thermocouples, and have high accuracy for high temperature (above 300°C).

[0051] In some embodiments, the pressure regulating mechanism includes a gas cylinder 41, a first ventilation pipe 43 and a second ventilation pipe 44, the gas cylinder 41 is used to provide inert gas; one end of the first ventilation pipe 43 is connected to the gas cylinder 41, and the other end is connected to the upper ventilation port of the quartz plate cavity; one end of the second ventilation pipe 44 is connected to the gas cylinder 41, and the other end is connected to the lower ventilation port of the quartz plate cavity; gas valves are provided on the first ventilation pipe 43 and the second ventilation pipe 44.

[0052] Exemplarily, the gas cylinder 41 is connected to one end of the gas cylinder ventilation pipe, the gas cylinder ventilation pipe is provided with a first air valve 42, and the other end of the gas cylinder ventilation pipe is respectively connected to one end of the first ventilation pipe 43 and the second ventilation pipe 44. After the first ventilation pipe 43 is connected to the second air valve 45, and the second ventilation pipe 44 is connected to the third air valve 46, the quartz plate cavity is sealed, so that the pressure regulating mechanism and the melt casting mechanism form a connected closed space; an inert gas medium of a predetermined pressure is introduced into the upper and lower plates through the first air valve 42, the first ventilation pipe 43 and the second ventilation pipe 44, so that the upper and lower pressures are connected. The forces are equal to form a balanced state. After the internal air pressure reaches equilibrium, pressure is applied to the upper sealed chamber and the lower sealed chamber at the same time. The alloy melt is pressed into the casting mold 11 from bottom to top by using the pressure difference between the upper and lower sealed chambers. Specifically, the lower third air valve 46 stops intake of air, and the upper second air valve 45 is exhausted to form a pressure difference to achieve filling; or the upper second air valve 45 is exhausted to stop intake of air, and the lower third air valve 46 continues to intake air to form a pressure difference to achieve filling; after the casting mold 11 is filled, the pressure difference between the upper and lower sealed chambers is kept constant until the casting is solidified, and then the pressure is released.

[0053] In the embodiment of the present invention, the pressure regulating mechanism includes a pressure gauge for obtaining the real-time pressure. The pressure regulating mechanism will adjust the pressure parameters in real time in combination with the actual pressure value to meet the requirement of stable filling of the metal melt in the mold 11, and can study the influence of the pressure regulating process parameters (such as pressure, pressure change speed, etc.) on the anti-gravity casting alloy. The pressure parameters include pressure and pressure change speed. In order to ensure the complete filling of the mold 11, sufficient molten metal melt needs to enter the mold 11. Therefore, the pressure is closely related to the stability of the mold filling, and the pressure change speed is closely related to the integrity of the mold filling. By adjusting the air valve on the corresponding vent pipe, changing the pressure and the pressure change speed, the metal melt is filled and solidified from bottom to top, and the influence of the pressure regulating process parameters on the anti-gravity casting forming performance can be studied, and the in-situ observation of the filling and solidification process of the alloy melt in the mold 11 can be realized.

[0054] In the above embodiment, the entire melt casting mechanism adopts a main body material of high-purity quartz, which can withstand high temperatures up to 1700°C; the induction heating device adopts ultra-high frequency induction heating, and its frequency can reach 1.5MHz, and the frequency is continuously adjustable. For the induction heating of small volume metals, it can reach extremely high temperatures, and its induction heating temperature can reach up to 2000°C. The entire device can achieve a wide operating temperature (300-2000°C), and can be applied to low, medium and high temperature melting point alloys, with strong universality.

[0055] In the above embodiment of the present invention, the device is sealed, the alloy is isolated from the outside air, and the inside is not in contact with oxygen, so as to perform filling and solidification; by using the pressure-regulated casting principle, only the pressure needs to be adjusted, and the alloy sealed in the melt casting mechanism 1 uses the pressure difference between the upper and lower sealing chambers to push the molten alloy from bottom to top, without the help of a push rod, etc., the structure is simple, the operation process is simple, the equipment operation is safe and reliable, economical and environmentally friendly, and the real-time changes of the high-temperature alloy in the anti-gravity filling and solidification process can be observed in situ using a synchrotron radiation light source, and the anti-gravity filling and solidification behavior of the high-temperature alloy melt under pressure can be observed in real time. The entire device can achieve a wide operating temperature (300-2000℃), is applicable to alloys with different melting point temperatures, and can be applicable to low, medium and high temperature melting point alloys, and has strong universality. The device can be reused, and a large number of micro-anti-gravity casting in-situ experimental studies can be carried out, which is conducive to solving the key problem of coordinated control of filling and solidification in the field of anti-gravity casting.

[0056] Based on the same inventive concept, another embodiment of the present invention provides an in-situ observation method for the counter-gravity filling and solidification process of a high-temperature alloy, which is implemented using the above-mentioned in-situ observation device for the counter-gravity filling and solidification process of a high-temperature alloy. The method includes:

[0057] S1. Install the device on the beam station of the synchrotron radiation source, turn on the synchrotron radiation X-ray device, and irradiate the X-rays on the mold observation window, i.e., the center of the mold 11, for imaging observation;

[0058] S2, placing the block-shaped high-temperature alloy to be observed in the melt tank 12, then sealing the melt casting mechanism 1, and sleeve the heating mechanism 2 on the outside of the quartz plate cavity, and the position of the induction coil should fully cover the position of the melt tank 12, so that the high-temperature alloy can be completely melted;

[0059] S3, connecting the upper and lower vents of the quartz plate cavity to the pressure regulating mechanism to form a connected closed space;

[0060] S4, turning on the power supply, using the heating mechanism 2 to heat the high temperature alloy to form an alloy melt, and heating the casting mold 11, specifically, heating the alloy and the casting mold 11 by an induction heating device, inserting a thermocouple of the temperature measuring mechanism into the temperature measuring hole 33 of the quartz plate, and another thermocouple in contact with the outer surface of the melt tank 12 through an induction coil (the thermocouple is not in contact with the induction coil), and monitoring the temperature of the alloy melt and the casting mold in real time by the temperature measuring mechanism;

[0061] S5. Determine whether the heating temperature has reached the requirement by reading the reading on the temperature controller connected to the thermocouple; when the pouring temperature and the casting mold temperature both reach the preset temperature, open the pressure regulating mechanism, and introduce a predetermined pressure of inert gas medium into the upper and lower sealed chambers of the sealed quartz sheet. After reaching equilibrium, apply pressure to the upper and lower sealed chambers at the same time, and adjust the pressure so that the pressure in the lower sealed chamber is higher than that in the upper sealed chamber, so as to form a pressure difference between the upper and lower sealed chambers. The alloy melt is pressed into the casting mold 11 from bottom to top by using the pressure difference. After the casting mold 11 is filled, the pressure difference between the upper and lower sealed chambers is kept constant until the casting is solidified, and then the pressure is released;

[0062] S6. The detector 5 is used to collect experimental signals corresponding to the real-time filling and solidification behaviors of the alloy melt. The real-time filling and solidification behaviors of the high-temperature alloy melt are observed under the irradiation of a synchrotron radiation light source during filling and solidification, so as to realize in-situ observation of the anti-gravity filling and solidification process of the high-temperature alloy.

[0063] In some optional embodiments, an imaging detector is used to collect transmission signals from a high-energy synchrotron radiation source, and the transmission signals are processed to form images. The collected transparent signals are converted into specific image information through processing, the experimental process and results are directly observed, and the coagulation process is observed based on the imaging results.

[0064] In some optional implementations, a diffraction signal detector is used to collect diffraction signals from a high-energy synchrotron radiation source to achieve real-time analysis of phase precipitation and phase transformation during anti-gravity solidification. The method in the embodiment of the present invention can not only observe the real-time filling and solidification behavior changes of the alloy inside the device, but also greatly help to study the changes in the internal microstructure of the casting process.

[0065] The above-mentioned embodiment of the present invention can realize the melting of high-temperature alloys and the observation of the melt flow process under pressure through the mutual cooperation between the melt casting mechanism, the heating mechanism, the temperature measuring mechanism, the pressure regulating mechanism, etc. The working range of the device is relatively wide, and it is applicable to low, medium and high temperature melting point alloys, and has a wide range of applications. The casting device in the embodiment of the present invention is an anti-gravity micro-casting device, which has low equipment construction costs, low costs for each experiment, and the structure of the casting mold can be flexibly designed. The technology is simple to implement and can reproduce actual production conditions. The device in the embodiment of the present invention can be applied to synchrotron radiation light sources to realize in-situ observation of the anti-gravity filling and solidification behavior of the flowing melt of the high-temperature alloy under pressure under the conditions of synchrotron radiation light sources.

[0066] The above describes the specific embodiments of the present invention. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various modifications or variations within the scope of the claims, which does not affect the essence of the present invention. The above preferred features can be used in any combination without conflicting with each other.

Claims

1. An in-situ observation device for the anti-gravity filling and solidification process of a high-temperature alloy, characterized in that: include: The melt casting mechanism comprises a quartz plate cavity, a melt tank and a casting mold arranged in the quartz plate cavity, wherein the casting mold is located above the melt tank; a casting mold observation window is arranged on the quartz plate cavity, and X-rays from a synchrotron radiation light source are irradiated on the center of the casting mold through the casting mold observation window; A heating mechanism, used for heating the high temperature alloy to form an alloy melt, and for heating the casting mold; A temperature measuring mechanism, used for measuring the temperature of the alloy melt and the casting mold; A pressure regulating mechanism, wherein the pressure regulating mechanism applies pressure to the upper sealed chamber and the lower sealed chamber of the melt casting mechanism at the same time, thereby forming a pressure difference between the upper sealed chamber and the lower sealed chamber, and utilizing the pressure difference to press the alloy melt into the casting from bottom to top. After the casting is filled, the pressure difference between the upper sealed chamber and the lower sealed chamber is kept constant until the casting is solidified; The detector obtains signals of the real-time filling and solidification behaviors of the alloy melt under the irradiation of the synchrotron radiation light source, thereby realizing in-situ observation of the anti-gravity filling and solidification processes of the high-temperature alloy.

2. The in-situ observation device for the anti-gravity filling and solidification process of high-temperature alloy according to claim 1, characterized in that: The upper and lower ends of the quartz plate cavity are provided with vents, and the vents are connected to the pressure regulating mechanism; The melt casting mechanism comprises two quartz plate clamps, which are aligned, tightened and sealed to form a sealed whole.

3. The in-situ observation device for the anti-gravity filling and solidification process of high-temperature alloy according to claim 1, characterized in that: The thickness of the casting mold is less than 0.50 mm.

4. The in-situ observation device for the anti-gravity filling and solidification process of high-temperature alloy according to claim 1, characterized in that: The heating mechanism is an induction heating device, which is placed directly below the mold, and the height of the induction coil of the induction heating device is not less than the height of the melt tank.

5. The in-situ observation device for the anti-gravity filling and solidification process of high-temperature alloy according to claim 1, characterized in that: The induction heating temperature of the induction heating device can reach up to 2000°C.

6. The in-situ observation device for the anti-gravity filling and solidification process of high-temperature alloy according to claim 1, characterized in that: The temperature measuring mechanism comprises: a first thermocouple, the first thermocouple being in contact with the outer surface of the melt tank and being used to measure the temperature of the alloy melt; A second thermocouple, wherein a temperature measuring hole is provided on the quartz plate cavity, the position of the temperature measuring hole corresponds to the casting mold, and the second thermocouple is located in the temperature measuring hole and is used to measure the temperature at the casting mold position; A temperature controller is used to display the measurement results of the first thermocouple and the second thermocouple.

7. The in-situ observation device for the anti-gravity filling and solidification process of high-temperature alloy according to claim 2, characterized in that: The pressure regulating mechanism comprises: Gas cylinders, used to provide inert gas; A first ventilation pipe, one end of which is connected to the gas cylinder, and the other end of which is connected to the upper ventilation port of the quartz plate cavity; A second ventilation pipe, one end of which is connected to the gas cylinder, and the other end of which is connected to the lower end ventilation port of the quartz plate cavity; The first ventilation pipe and the second ventilation pipe are both provided with air valves.

8. An in-situ observation method for the anti-gravity filling and solidification process of a high-temperature alloy, characterized in that: The method is implemented by using the in-situ observation device for the anti-gravity filling and solidification process of the high-temperature alloy according to any one of claims 1 to 7, and the method comprises: The device is placed on the beamline of the synchrotron radiation source so that the X-rays are irradiated at the center of the mold; The block-shaped high-temperature alloy to be observed is placed in the melt tank, and then the melt casting mechanism is sealed, and the heating mechanism is sheathed on the outside of the quartz plate cavity; Connect the upper and lower vents of the quartz plate cavity to the pressure regulating mechanism to form a connected closed space; The high temperature alloy is heated by a heating mechanism to form an alloy melt, and the casting mold is heated, and the temperature of the alloy melt and the casting mold is monitored in real time by a temperature measuring mechanism; When the pouring temperature and the mold temperature both reach the preset temperature, the pressure regulating mechanism is turned on, and an inert gas medium of a predetermined pressure is introduced into the upper and lower sealed chambers. After reaching equilibrium, pressure is applied to the upper and lower sealed chambers at the same time, forming a pressure difference between the upper and lower sealed chambers, and pressing the alloy melt into the mold from bottom to top. After the mold is filled, the pressure difference between the upper and lower sealed chambers is kept constant until the casting is solidified; The detector collects the signals corresponding to the real-time filling and solidification behaviors of the alloy melt, thus realizing in-situ observation of the anti-gravity filling and solidification process of the high-temperature alloy.

9. The in-situ observation method for the counter-gravity filling and solidification process of a high-temperature alloy according to claim 8, characterized in that: The method of collecting signals corresponding to the real-time filling and solidification behaviors of the alloy melt by a detector includes: using an imaging detector to collect transmission signals of a synchrotron radiation light source, processing the transmission signals to form an image, and observing the solidification process according to the imaging results.

10. The in-situ observation method for the counter-gravity filling and solidification process of a high-temperature alloy according to claim 8, characterized in that: The detector is used to collect signals corresponding to the real-time filling and solidification behaviors of the alloy melt, including: using a diffraction signal detector to collect diffraction signals of a synchrotron radiation light source, so as to realize real-time analysis of phase precipitation and phase transformation during the anti-gravity solidification process.

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