CN114231810A - Hot isostatic pressing process for promoting uniform diffusion of magnesium alloy and eliminating casting defects - Google Patents
Hot isostatic pressing process for promoting uniform diffusion of magnesium alloy and eliminating casting defects Download PDFInfo
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- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 97
- 238000001513 hot isostatic pressing Methods 0.000 title claims abstract description 63
- 238000000034 method Methods 0.000 title claims abstract description 51
- 238000005266 casting Methods 0.000 title claims abstract description 50
- 230000008569 process Effects 0.000 title claims abstract description 33
- 230000007547 defect Effects 0.000 title claims abstract description 26
- 238000009792 diffusion process Methods 0.000 title claims abstract description 22
- 230000001737 promoting effect Effects 0.000 title claims abstract description 14
- 229910052761 rare earth metal Inorganic materials 0.000 claims abstract description 66
- 150000002910 rare earth metals Chemical class 0.000 claims description 50
- 238000010438 heat treatment Methods 0.000 claims description 39
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 18
- 238000004321 preservation Methods 0.000 claims description 14
- 229910052786 argon Inorganic materials 0.000 claims description 9
- 229910052779 Neodymium Inorganic materials 0.000 claims description 4
- 229910052802 copper Inorganic materials 0.000 claims description 4
- 229910052759 nickel Inorganic materials 0.000 claims description 4
- 229910052725 zinc Inorganic materials 0.000 claims description 4
- 238000005204 segregation Methods 0.000 abstract description 3
- 230000003068 static effect Effects 0.000 abstract description 2
- 230000000052 comparative effect Effects 0.000 description 12
- 238000001514 detection method Methods 0.000 description 10
- 239000000956 alloy Substances 0.000 description 8
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000013078 crystal Substances 0.000 description 5
- 238000000265 homogenisation Methods 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005728 strengthening Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000002776 aggregation Effects 0.000 description 2
- 238000004220 aggregation Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000462 isostatic pressing Methods 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 229910052688 Gadolinium Inorganic materials 0.000 description 1
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 229910001069 Ti alloy Inorganic materials 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000003679 aging effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000012797 qualification Methods 0.000 description 1
- 238000001953 recrystallisation Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
- C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D31/00—Cutting-off surplus material, e.g. gates; Cleaning and working on castings
- B22D31/002—Cleaning, working on castings
- B22D31/005—Sealing or impregnating porous castings
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D2241/00—Treatments in a special environment
- C21D2241/01—Treatments in a special environment under pressure
- C21D2241/02—Hot isostatic pressing
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
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Abstract
The invention discloses a hot isostatic pressing process for promoting uniform diffusion of magnesium alloy and eliminating casting defects. The hot isostatic pressing process effectively improves the segregation condition of the rare earth elements at the grain boundary in the magnesium alloy structure, the magnesium alloy is subjected to uniform static pressure in all directions under the high-temperature condition, air holes are closed, casting porosity is improved, the density of the magnesium alloy is increased, and the comprehensive mechanical property is improved. The invention is particularly suitable for Mg-Gd-Y-Zr magnesium alloy.
Description
Technical Field
The invention belongs to the technical field of magnesium alloy material heat treatment, and particularly relates to a hot isostatic pressing process for promoting uniform diffusion of magnesium alloy and eliminating casting defects.
Background
The magnesium alloy has the characteristics of small density, high specific strength, specific stiffness, excellent easiness in recycling and the like which are superior to those of the traditional metal material, so that the magnesium alloy has wide application space in the fields of aerospace, military special materials, traffic electronics and the like. The rare earth element is used as a main alloy element in the current magnesium alloy, the recrystallization temperature of the magnesium alloy can be improved through the diffusion capacity of the rare earth element, a dispersed phase which has obvious influence on the alloy performance is precipitated through the good aging effect of the rare earth element, the creep resistance and the high temperature resistance of the magnesium alloy are improved, and the improvement of the performance of the rare earth element on the magnesium alloy cannot be replaced by other elements. Among rare earth magnesium alloys, the rare earth magnesium alloy taking Mg-Gd and Mg-Y as matrixes has the optimal performance.
Therefore, when the magnesium alloy is prepared, a proper amount of rare earth elements are added, the lattice distortion of a magnesium matrix is combined to strengthen the alloy performance, and the magnesium alloy can be endowed with very outstanding solid solution strengthening and aging strengthening effects under certain conditions. However, when the mass percent of the added rare earth elements is 5%, the problem of local segregation can be generated in the grain boundary, and the phenomenon can influence the comprehensive performance of the material; meanwhile, because the magnesium alloy has a relatively large curing temperature range, the defects of air holes, looseness and the like are easily generated when the magnesium alloy casting is solidified, and the casting defects directly influence the performance of the magnesium alloy and reduce the qualification rate of the casting. Because the magnesium alloy has better hot compressibility, the casting defect can be eliminated only by very large pressure at a certain temperature; however, at high temperature, the crystal grains of the magnesium alloy grow rapidly, and the comprehensive mechanical properties of the magnesium alloy are seriously influenced. In the traditional heat treatment mode, the magnesium alloy material completes the rare earth element diffusion homogenization process, the required diffusion temperature is high, the crystal grains of the rare earth element grow obviously in the diffusion process, and the coarse crystal grains can influence the performance of the rare earth magnesium alloy casting.
The Hot Isostatic Pressing (HIP) technology is a process technology which utilizes high temperature and high pressure to simultaneously act to enable a component to undergo three-dimensional isostatic pressing, and is an effective way for carrying out hot densification treatment on a casting and improving the overall performance of the casting. The closing effect of hot isostatic pressing treatment on metallurgical defects such as titanium alloy and aluminum alloy casting product looseness and the influence on the comprehensive mechanical property of the alloy are widely researched, but no relevant report that the Hot Isostatic Pressing (HIP) technology is applied to rare earth magnesium alloy is found, because when the Hot Isostatic Pressing (HIP) is applied to the rare earth magnesium alloy, the temperature and pressure conditions are difficult to coordinate and control, the rare earth magnesium alloy has good compression performance at lower temperature, and the looseness inside the casting cannot be closed under the action of pressure; and the higher temperature can cause the growth of crystal grains in the rare earth magnesium alloy, thereby seriously affecting the mechanical property of the casting. Therefore, the common hot isostatic pressing process cannot be applied to magnesium alloy casting products. .
Disclosure of Invention
The invention aims to overcome the defects and provides a hot isostatic pressing process for promoting the magnesium alloy to be uniformly diffused and eliminating casting defects. The hot isostatic pressing process effectively improves the segregation condition of the rare earth elements at the grain boundary in the magnesium alloy structure, the magnesium alloy is subjected to uniform static pressure in all directions under the high-temperature condition, air holes are closed, casting porosity is improved, the density of the magnesium alloy is increased, and the comprehensive mechanical property is improved. The invention is particularly suitable for Mg-Gd-Y-Zr magnesium alloy.
In order to achieve the above purpose, the invention provides the following technical scheme:
a hot isostatic pressing process for promoting uniform diffusion of magnesium alloys and for eliminating casting defects, comprising the steps of:
s1, placing the as-cast rare earth magnesium alloy in a hot isostatic pressing device, and vacuumizing the interior of the hot isostatic pressing device;
s2, introducing argon, raising the internal temperature of the hot isostatic pressing device at the same time, enabling the internal pressure of the hot isostatic pressing device to reach the preset pressure and the internal temperature to reach the preset temperature, and keeping the temperature and the pressure for 1-8 hours; the preset pressure is 80MPa to 300MPa, and the preset temperature is 400 ℃ to 600 ℃;
s3, releasing argon, and simultaneously reducing the internal temperature of the hot isostatic pressing device, so that the internal pressure of the hot isostatic pressing device is reduced to normal pressure, the internal temperature is reduced to 20-120 ℃, and the as-cast rare earth magnesium alloy is taken out.
Further, in the step S1, the as-cast rare earth magnesium alloy is Mg-Gd-Y-Zr magnesium alloy.
Further, the Mg-Gd-Y-Zr magnesium alloy comprises the following components in percentage by mass:
gd: 6-10%; y:0 to 3 percent; zr: 0.2-0.6%; other components: less than or equal to 0.5 percent; mg: the balance;
other components include Ni, Zn, Cu, Nd.
Further, in the step S1, the as-cast rare earth magnesium alloy is formed by sand-type antigravity casting and is cut off from the casting head.
Further, in step S2, raising the internal temperature of the hot isostatic pressing device to a predetermined temperature by using a multi-stage temperature raising and maintaining method; the multi-stage heating and heat preservation method comprises heating for more than or equal to 2 times and heat preservation for more than or equal to 1 time.
Further, the multi-stage heating and heat preservation method comprises 3 times of heating and 2 times of heat preservation, and the specific method comprises the following steps:
heating to 40-100 ℃ for the first time, and keeping the temperature for 10-30 min;
heating to 250-330 ℃ for the second time, and keeping the temperature for 30 min-2 h;
and raising the temperature to 400-600 ℃ for the third time.
Or the multi-stage heating and heat preservation method comprises 4 times of heating and 3 times of heat preservation, and the specific method comprises the following steps:
heating to 40-100 ℃ for the first time, and keeping the temperature for 10-30 min;
heating to 250-330 ℃ for the second time, and keeping the temperature for 30 min-2 h;
heating to 350-380 ℃ for the third time, and keeping the temperature for 30 min-2 h;
the fourth temperature is raised to 400-600 ℃.
Furthermore, the heating rate of each heating process is 50-200 ℃/h.
Further, in the step S2, the preset pressure is 120MPa to 200MPa, and the heat preservation and pressure maintaining are carried out for 4 to 8 hours.
Compared with the prior art, the invention has the following beneficial effects:
(1) according to the invention, through a hot isostatic pressing process, the rare earth magnesium alloy is diffused uniformly, the casting defect difference is eliminated, a higher diffusion coefficient can be obtained under the action of the same temperature and the same attached pressure as those of the traditional heat treatment method, the diffusion time of rare earth elements is short, the crystal grains grow up insignificantly, and the final fine grain strengthening effect of the casting is obvious;
(2) the isostatic pressing method adopts a method of multi-stage temperature rise and simultaneous temperature rise to pressure rise, and further promotes the diffusion of rare earth elements in the rare earth magnesium alloy, and improves the performance of the rare earth magnesium alloy;
(3) the hot isostatic pressing method disclosed by the invention is simple in process, can be used for continuously carrying out post-treatment on the formed rare earth magnesium alloy casting, closing the internal pores of the casting, improving the defect of casting looseness, and improving the density of the rare earth magnesium alloy casting, so that the mechanical property of the material is improved.
Drawings
FIG. 1 is a metallographic photograph of an as-cast Mg-9Gd-3Y-0.4Zr rare earth magnesium alloy obtained in example 1 of the present invention;
FIG. 2 shows the industrial CT detection result of the as-cast Mg-9Gd-3Y-0.4Zr alloy obtained in example 1 of the present invention;
FIG. 3 is a graph of a hot isostatic pressing process used in example 1 of the present invention;
FIG. 4 is a metallographic photograph of an as-cast Mg-10Gd-3Y-0.4Zr alloy obtained in example 2 of the present invention;
FIG. 5 shows the industrial CT detection result of the cast Mg-10Gd-3Y-0.4Zr rare earth magnesium alloy obtained in example 2 of the present invention;
FIG. 6 is a graph of a hot isostatic pressing process used in example 2 of the present invention;
FIG. 7 is a metallographic photograph of the as-cast Mg-9Gd-3Y-0.4Zr rare earth magnesium alloy obtained in comparative example 1;
FIG. 8 shows the industrial CT detection results of the Mg-9Gd-3Y-0.4Zr as-cast rare earth magnesium alloy obtained in comparative example 1;
FIG. 9 is a metallographic photograph of the as-cast Mg-10Gd-3Y-0.4Zr rare earth magnesium alloy obtained in comparative example 2;
FIG. 10 shows the industrial CT detection result of the Mg-10Gd-3Y-0.4Zr as-cast rare earth magnesium alloy obtained in comparative example 2.
Detailed Description
The features and advantages of the present invention will become more apparent and appreciated from the following detailed description of the invention.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The invention provides a hot isostatic pressing process for promoting magnesium alloy diffusion homogenization and eliminating casting defects, aiming at the problems that rare earth is partially segregated in high-strength and high-toughness cast magnesium alloy and casting defects are easily generated when rare earth magnesium alloy is cast into shape, and the hot isostatic pressing process comprises the following steps:
s1, placing the as-cast rare earth magnesium alloy in a hot isostatic pressing device, and vacuumizing the interior of the hot isostatic pressing device;
s2: introducing argon, simultaneously heating the interior of the hot isostatic pressing device according to a set process curve to enable the pressure of the interior of the hot isostatic pressing device to reach 80-300 MPa, simultaneously enabling the temperature to reach 400-600 ℃, and then preserving heat and pressure for 1-8 hours;
and S3, releasing inert gas, and simultaneously cooling the interior of the hot isostatic pressing device, so that the pressure in the hot isostatic pressing device is reduced to normal pressure, and the rare earth magnesium alloy is taken out when the internal temperature is reduced to 20-120 ℃.
In a preferred embodiment, in step S1, the magnesium alloy casting is formed by sand-type antigravity casting, and the magnesium alloy casting is placed in a hot isostatic pressing device after casting heads are cut off;
in a preferred embodiment, the step S2 includes a multi-stage heating and maintaining process, and the temperature is increased to the pressure at the same time;
in a preferred embodiment, the temperature rise rate in step S2 is 50 ℃/h-200 ℃/h;
in a preferred embodiment, the predetermined pressure in step S2 is 120MPa to 200 MPa;
in a preferred embodiment, the time for heat preservation and pressure maintaining is 4-6 h;
in a preferred embodiment, the Mg-Gd-Y-Zr series as-cast rare earth magnesium alloy comprises the following components in percentage by weight:
6-10% of Gd, 0-3% of Y, 0.2-0.6% of Zr, less than or equal to 0.5% of the rest, and the balance of Mg, wherein the other components comprise Ni, Zn, Cu or Nd.
Other components include Ni, Zn, Cu, Nd.
Example 1
In this embodiment, the as-cast rare earth magnesium alloy is a Mg-9Gd-3Y-0.4Zr cast magnesium alloy prepared by antigravity casting, and the hot isostatic pressing process for promoting uniform diffusion of magnesium alloy and eliminating casting defects in this embodiment includes:
firstly, placing a casting into a hot isostatic pressing device, and vacuumizing the interior of the hot isostatic pressing device;
heating the inside of the hot isostatic pressing device and introducing argon to ensure that the pressure inside the hot isostatic pressing device reaches 145-150 MPa, wherein the specific method for controlling the heating process comprises the following steps: heating to 80 ℃ for the first time, and keeping the temperature for 10 min; the temperature is increased to 250 ℃ for the second time, the temperature is kept for 30min, and the temperature is finally increased to 500 ℃. And (3) after maintaining the temperature and the pressure for 3 hours, releasing argon, reducing the internal pressure of the hot isostatic pressing device to normal pressure, simultaneously reducing the internal temperature of the device to 80 ℃, taking out the as-cast rare earth magnesium alloy, and cooling the as-cast rare earth magnesium alloy to room temperature by air, wherein a metallographic photograph of the obtained as-cast rare earth magnesium alloy is shown in fig. 1, an industrial CT detection result is shown in fig. 2, and a hot isostatic pressing process curve of the embodiment is shown in fig. 3.
Example 2
In this embodiment, the as-cast rare earth magnesium alloy is a Mg-10Gd-3Y-0.4Zr cast magnesium alloy prepared by antigravity casting, and the hot isostatic pressing process for promoting uniform diffusion of magnesium alloy and eliminating casting defects in this embodiment includes:
firstly, placing a casting into a hot isostatic pressing device, and vacuumizing the interior of the hot isostatic pressing device;
heating the inside of the hot isostatic pressing device and introducing argon to ensure that the pressure inside the hot isostatic pressing device reaches 200MPa, wherein the specific method for controlling the heating process comprises the following steps: heating to 80 ℃ for the first time, preserving heat for 10min, heating to 250 ℃ for the second time, preserving heat for 30min, heating to 350 ℃ for the third time, preserving heat for 30min, finally heating to 430 ℃, preserving heat and pressure for 5h, releasing argon, reducing the internal pressure of the hot isostatic pressing device to normal pressure, simultaneously reducing the internal temperature of the device to 100 ℃, taking out the cast rare earth magnesium alloy, and cooling to room temperature. The metallographic photograph of the obtained as-cast rare earth magnesium alloy is shown in FIG. 4, the industrial CT detection result is shown in FIG. 5, and the hot isostatic pressing process curve of the embodiment is shown in FIG. 6
Comparative example 1
The metallographic photograph of the as-cast rare earth magnesium alloy of Mg-9Gd-3Y-0.4Zr which is not treated by the hot isostatic pressing process of the invention and obtained in the comparative example is shown in figure 7, and the industrial CT detection result is shown in figure 8.
According to the metallographic photograph result, the structure of the rare earth magnesium alloy in the comparative example 1 has obvious rare earth element aggregation at the grain boundary, the rare earth element at the grain boundary in the structures of the rare earth magnesium alloys in the examples 1 and 2 has primarily completed diffusion homogenization, and the grains do not grow obviously.
According to the industrial CT detection result, casting defects such as air holes are loose in the cast rare earth magnesium alloy in the comparative example 1, the air holes of the cast rare earth magnesium alloy in the examples 1 and 2 are closed, the loosening condition is obviously improved, and the hot isostatic pressing treatment of the invention can obviously reduce the casting defects such as the air holes and the loosening of the rare earth magnesium alloy.
Comparative example 2
The metallographic photograph of the as-cast rare earth magnesium alloy of Mg-10Gd-3Y-0.4Zr which is not treated by the hot isostatic pressing process of the invention and obtained in the comparative example is shown in figure 9, and the industrial CT detection result is shown in figure 10.
According to the metallographic photograph result, the structure of the rare earth magnesium alloy in the comparative example 2 has obvious rare earth element aggregation at the grain boundary, the rare earth element at the grain boundary in the rare earth magnesium alloy structures in the examples 1 and 2 has primarily completed diffusion homogenization, and the grains do not grow obviously.
According to the industrial CT detection result, casting defects such as air holes are loosened in the cast rare earth magnesium alloy in the comparative example 2, the loosening condition is obviously improved due to the fact that the air holes of the cast rare earth magnesium alloy in the examples 1 and 2 are closed, and the hot isostatic pressing treatment can obviously reduce the casting defects such as the air holes and the loosening of the rare earth magnesium alloy.
The invention has been described in detail with reference to specific embodiments and illustrative examples, but the description is not intended to be construed in a limiting sense. Those skilled in the art will appreciate that various equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its embodiments without departing from the spirit and scope of the present invention, which fall within the scope of the present invention. The scope of the invention is defined by the appended claims.
Those skilled in the art will appreciate that those matters not described in detail in the present specification are well known in the art.
Claims (8)
1. A hot isostatic pressing process for promoting uniform diffusion of magnesium alloys and for eliminating casting defects, comprising the steps of:
s1, placing the as-cast rare earth magnesium alloy in a hot isostatic pressing device, and vacuumizing the interior of the hot isostatic pressing device;
s2, introducing argon, raising the internal temperature of the hot isostatic pressing device at the same time, enabling the internal pressure of the hot isostatic pressing device to reach the preset pressure and the internal temperature to reach the preset temperature, and keeping the temperature and the pressure for 1-8 hours; the preset pressure is 80MPa to 300MPa, and the preset temperature is 400 ℃ to 600 ℃;
s3, releasing argon, and simultaneously reducing the internal temperature of the hot isostatic pressing device, so that the internal pressure of the hot isostatic pressing device is reduced to normal pressure, the internal temperature is reduced to 20-120 ℃, and the as-cast rare earth magnesium alloy is taken out.
2. The hot isostatic pressing process for promoting uniform diffusion of magnesium alloy and eliminating casting defects according to claim 1, wherein in step S1, the as-cast rare earth magnesium alloy is Mg-Gd-Y-Zr based magnesium alloy.
3. The hot isostatic pressing process for promoting uniform diffusion of magnesium alloy and eliminating casting defects according to claim 2, wherein the Mg-Gd-Y-Zr based magnesium alloy comprises the following components in percentage by mass:
gd: 6-10%; y:0 to 3 percent; zr: 0.2-0.6%; other components: less than or equal to 0.5 percent; mg: the balance;
other components include Ni, Zn, Cu or Nd.
4. The process according to claim 1, wherein in step S1, the as-cast rare earth magnesium alloy is formed by sand-type antigravity casting and has a casting head removed.
5. The process of claim 1, wherein in step S2, the internal temperature of the hipping device is raised to a predetermined temperature by using a multi-stage temperature raising and maintaining method; the multi-stage heating and heat preservation method comprises heating for more than or equal to 2 times and heat preservation for more than or equal to 1 time.
6. The hot isostatic pressing process for promoting uniform diffusion of magnesium alloy and eliminating casting defects according to claim 5, wherein the multi-stage temperature rise and heat preservation method comprises 3 temperature rises and 2 heat preservation steps, and the specific method comprises the following steps:
heating to 40-100 ℃ for the first time, and keeping the temperature for 10-30 min;
heating to 250-330 ℃ for the second time, and keeping the temperature for 30 min-2 h;
heating to 400-600 ℃ for the third time;
or the multi-stage heating and heat preservation method comprises 4 times of heating and 3 times of heat preservation, and the specific method comprises the following steps:
heating to 40-100 ℃ for the first time, and keeping the temperature for 10-30 min;
heating to 250-330 ℃ for the second time, and keeping the temperature for 30 min-2 h;
heating to 350-380 ℃ for the third time, and keeping the temperature for 30 min-2 h;
the fourth temperature is raised to 400-600 ℃.
7. The process according to claim 6, wherein the heating rate per heating process is 50-200 ℃/h.
8. The hot isostatic pressing process for promoting uniform diffusion of magnesium alloy and eliminating casting defects according to claim 1, wherein in the step S2, the predetermined pressure is 120MPa to 200MPa, and the temperature and pressure are kept for 4 to 8 hours.
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|---|---|---|---|---|
| CN116043086A (en) * | 2022-12-19 | 2023-05-02 | 湖南稀土金属材料研究院有限责任公司 | Soluble magnesium alloy, preparation method and application thereof, and fracturing product |
| CN116043086B (en) * | 2022-12-19 | 2024-04-12 | 湖南稀土金属材料研究院有限责任公司 | Soluble magnesium alloy, preparation method and application thereof, and fracturing product |
| CN116024511A (en) * | 2023-03-29 | 2023-04-28 | 上海航天精密机械研究所 | Mg-Gd-Y-Zr rare earth magnesium alloy heat treatment method based on hot isostatic pressing |
| CN116024511B (en) * | 2023-03-29 | 2023-07-21 | 上海航天精密机械研究所 | Mg-Gd-Y-Zr rare earth magnesium alloy heat treatment method based on hot isostatic pressing |
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