CN117551889A - Short-process peer recycling method for waste nickel-based superalloy - Google Patents
Short-process peer recycling method for waste nickel-based superalloy Download PDFInfo
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- CN117551889A CN117551889A CN202311398296.2A CN202311398296A CN117551889A CN 117551889 A CN117551889 A CN 117551889A CN 202311398296 A CN202311398296 A CN 202311398296A CN 117551889 A CN117551889 A CN 117551889A
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- 239000002699 waste material Substances 0.000 title claims abstract description 85
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 63
- 229910000601 superalloy Inorganic materials 0.000 title claims abstract description 56
- 229910052759 nickel Inorganic materials 0.000 title claims abstract description 39
- 238000004064 recycling Methods 0.000 title claims abstract description 30
- 229910045601 alloy Inorganic materials 0.000 claims abstract description 129
- 239000000956 alloy Substances 0.000 claims abstract description 129
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052791 calcium Inorganic materials 0.000 claims abstract description 32
- 239000011575 calcium Substances 0.000 claims abstract description 32
- 238000010438 heat treatment Methods 0.000 claims abstract description 20
- 229910052751 metal Inorganic materials 0.000 claims abstract description 16
- 239000002184 metal Substances 0.000 claims abstract description 15
- 238000005242 forging Methods 0.000 claims description 22
- 238000005266 casting Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 7
- 229910052760 oxygen Inorganic materials 0.000 claims description 7
- 239000001301 oxygen Substances 0.000 claims description 7
- 238000004321 preservation Methods 0.000 claims description 7
- 238000010791 quenching Methods 0.000 claims description 7
- 230000000171 quenching effect Effects 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000003756 stirring Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 4
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 claims description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 claims description 3
- 239000000292 calcium oxide Substances 0.000 claims description 3
- 238000011946 reduction process Methods 0.000 claims description 3
- 150000002739 metals Chemical class 0.000 abstract description 2
- 238000004904 shortening Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 8
- 230000006698 induction Effects 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 6
- 229910052799 carbon Inorganic materials 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 238000003723 Smelting Methods 0.000 description 5
- 238000002844 melting Methods 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000011651 chromium Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005520 cutting process Methods 0.000 description 4
- 238000011049 filling Methods 0.000 description 4
- 238000006722 reduction reaction Methods 0.000 description 4
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 3
- WGLPBDUCMAPZCE-UHFFFAOYSA-N Trioxochromium Chemical compound O=[Cr](=O)=O WGLPBDUCMAPZCE-UHFFFAOYSA-N 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 229910052804 chromium Inorganic materials 0.000 description 3
- 229910000423 chromium oxide Inorganic materials 0.000 description 3
- 238000003776 cleavage reaction Methods 0.000 description 3
- 230000007017 scission Effects 0.000 description 3
- 238000004065 wastewater treatment Methods 0.000 description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000011534 incubation Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000002386 leaching Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001698 pyrogenic effect Effects 0.000 description 1
- 238000007670 refining Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000006104 solid solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B23/00—Obtaining nickel or cobalt
- C22B23/02—Obtaining nickel or cobalt by dry processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B5/00—General methods of reducing to metals
- C22B5/02—Dry methods smelting of sulfides or formation of mattes
- C22B5/04—Dry methods smelting of sulfides or formation of mattes by aluminium, other metals or silicon
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/04—Refining by applying a vacuum
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/16—Remelting metals
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a short-process peer recycling method of waste nickel-base superalloy, which comprises the steps of adding calcium into the waste nickel-base superalloy to remelt the waste nickel-base superalloy to obtain an alloy ingot and then carrying out heat treatment. According to the invention, the waste nickel-based superalloy is subjected to heat treatment after being added with calcium for remelting, so that oxide inclusion phases can be effectively removed, the plasticity of the remelted alloy is obviously improved, and the purpose of peer utilization is achieved on the basis of recovering the waste nickel-based superalloy in a short process. Comprehensively, the invention can realize the recycling of valuable metals, save resources and reduce pollution; shortening the recycling period of the nickel-based superalloy and simplifying the flow; on the basis of short flow, the performance of remelted alloy is improved, and the plasticity of the alloy is the same as or higher than that of standard alloy.
Description
Technical Field
The invention relates to the technical field of resource recycling, in particular to a short-process peer recycling method for waste nickel-based superalloy.
Background
Nickel-base superalloy (nickel-base alloy for short) refers to an alloy with high strength and certain oxidation corrosion resistance and other comprehensive properties at a high temperature of 650-1000 ℃. The high-temperature service waste water treatment agent has high utilization value after being scrapped due to the fact that the high-temperature service waste water treatment agent contains a large amount of valuable metal elements of nickel and chromium, and the high-temperature service waste water treatment agent directly discards resources and pollutes the environment. Therefore, the method has important significance for recycling the waste nickel-based superalloy.
For recovery of nickel-based alloys, conventional recovery methods mainly include fire, wet, and combined fire-wet processes. The pyrogenic process mainly comprises the steps of cleaning, drying, roasting, smelting, refining and the like, and the wet process generally comprises the steps of leaching, chemical pre-impurity removal, extraction impurity removal, element separation and the like, and the alloy with complex components is recovered by adopting a combined process. However, the nickel-based superalloy scrap recycling method is long in process, complex in process and difficult to use in the same level.
In order to simplify the recovery process, students use a vacuum induction smelting technology to recover and utilize the waste nickel-based superalloy in a direct remelting mode. However, the method cannot remove oxide inclusion phases in the waste alloy, so that the plasticity of the remelted alloy is reduced, and the alloy cannot be used at the same level.
Disclosure of Invention
The invention provides a method for recycling waste nickel-base superalloy in a short process and a same level, which is used for solving the defects of long recovery process, complex process and incapability of realizing the same level utilization in the prior art and realizing the recovery of the waste nickel-base superalloy in the short process.
The invention provides a short-process peer recycling method of waste nickel-base superalloy, which comprises the steps of adding calcium into the waste nickel-base superalloy to remelt the waste nickel-base superalloy to obtain an alloy ingot, and then carrying out heat treatment.
In order to realize the same-level utilization on the basis of short-flow recovery, the invention adopts remelting and heat treatment modes, and calcium is added in the remelting process to reduce oxide. The chemical component content, microstructure and mechanical property of the standard alloy and the direct remelted alloy are compared, and the fact that the addition of calcium can effectively remove oxide inclusion phases is found, so that the plasticity of the remelted alloy is obviously improved, and the purpose of peer utilization is achieved on the basis of recovering the waste alloy in a short process.
In some embodiments of the invention, the calcium is added in the form of metallic calcium having a purity of 99.5% and an added mass of 2-5 times the total oxygen content of the waste nickel-base superalloy.
In a specific embodiment, the total oxygen content in the waste nickel-base superalloy may be detected based on chemical composition.
In some embodiments of the invention, the step of adding calcium for remelting comprises:
vacuumizing to reduce the vacuum degree to 10 -2 Pa; heating until the waste nickel-based superalloy is completely melted; cooling to 1450-1480 ℃, and adding metal calcium to reduce oxide; heating to above 1482 ℃, standing to enable calcium oxide to float up to the liquid level of the molten metal, and removing residual calcium at the same time; cooling and casting into ingots.
In the above steps, the first temperature reduction is to prevent the volatilization of calcium during the process of adding metal calcium, which affects the effect of removing oxide inclusion phase, and the second temperature increase is to volatilize the redundant oxide after the oxide reduction.
Further, electromagnetic stirring is continuously used in the oxide reduction process, and the time is 30-60min.
In some embodiments of the invention, the step of heat treating comprises forging and solution treating.
In some embodiments of the invention, the forging includes forging at a forging ratio of 2:1 to 3:1 at 1000-1200 ℃.
In some embodiments of the invention, the solution treatment comprises water quenching immediately after incubation at 1100-1200 ℃ for 30-60min.
In some embodiments of the invention, the waste nickel-base superalloy is pretreated to remove scale and oil stains from the surface of the waste nickel-base superalloy prior to the re-smelting of the added calcium. Specifically, the removal can be performed by a removal method commonly used in the art, such as turning.
The waste nickel-based superalloy comprises waste nickel-based 690 alloy, waste nickel-based 600 alloy, waste nickel-based 617 alloy, waste nickel-based 625 alloy, waste nickel-based 718 alloy and other waste nickel-based superalloys.
In some embodiments of the present invention, the waste nickel-based superalloy is a waste nickel-based 690 alloy, the nickel-based 690 alloy having nickel (Ni) and chromium (Cr) as main alloying elements, and the alloy has excellent oxidation resistance, corrosion resistance, and high temperature strength. The short-process peer recycling method for the waste nickel-based superalloy comprises the following steps:
(a) Pretreatment of waste nickel-base superalloy: removing oxide skin and greasy dirt on the surface of the waste nickel-based superalloy by adopting a turning mode;
(b) The pretreated waste nickel-based superalloy is filled into a crucible and remelted by a vacuum induction melting technology, and the method comprises the following specific steps: (1) vacuumizing to reduce the vacuum degree to 10 -2 Pa; (2) heating, wherein the heating temperature is controlled to be 100-150 ℃ higher than that of nickel-based 690 alloy, namely 1477-1527 ℃ to ensure that the waste alloy is completely melted; (3) adding metal calcium, cooling to 1450 ℃, adding the metal calcium for oxide reduction, and using electromagnetic stirring in the reduction process to enable the reduction reaction to be more complete, wherein the time is 30min; (4) standing, heating to 1500 ℃, standing for 15min to enable calcium oxide to float up to the liquid level of the molten metal, and removing residual calcium at the same time; (5) cooling, and slowly pouring the molten liquid in the crucible into a mould to form an ingot.
(c) Heat treatment of the alloy ingot obtained by remelting comprises the following specific steps: (1) forging treatment, at 1200 ℃, according to a forging ratio of 2:1, forging; (2) solution treatment, heat preservation at 1100 ℃ for 30min, and water quenching immediately.
The invention also provides a recycled nickel-based superalloy, which is obtained by the waste nickel-based superalloy short-process same-level recycling method, and the strength and plasticity of the recycled nickel-based superalloy at room temperature and 650 ℃ are superior to those of a standard alloy.
The invention provides a short-process peer recycling method of waste nickel-base superalloy, which can effectively remove oxide inclusion phases by carrying out heat treatment after calcium adding and remelting on the waste nickel-base superalloy, so that the plasticity of the remelted alloy is obviously improved, and the purpose of peer utilization is achieved on the basis of recycling the waste nickel-base superalloy in a short process. Comprehensively, the invention can realize the recycling of valuable metals, save resources and reduce pollution; shortening the recycling period of the nickel-based superalloy and simplifying the flow; on the basis of short flow, the performance of remelted alloy is improved, and the plasticity of the alloy is the same as or higher than that of standard alloy.
Drawings
FIG. 1 is a microstructure of different types 690 alloys (a: standard alloy; b: direct remelted alloy; c: carbon added remelted alloy; d: calcium added remelted alloy);
FIG. 2 is a room temperature tensile fracture morphology of a different type 690 alloy (a: standard alloy; b: direct remelted alloy; c: carbon remelted alloy; d: calcium remelted alloy);
FIG. 3 shows the drawn fracture morphology at 650℃of different types of 690 alloy (a: standard alloy; b: direct remelting alloy; c: carbon-added remelting alloy; d: calcium-added remelting alloy).
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The specific techniques or conditions are not identified in the examples and are described in the literature in this field or are carried out in accordance with the product specifications. The reagents or equipment used were conventional products available for purchase by regular vendors without the manufacturer's attention.
Example 1
The embodiment provides a short-flow peer recycling method for waste nickel-based 690 alloy (the standard alloy of the nickel-based 690 alloy is placed in a muffle furnace and is served for 360 hours at 850 ℃ in an air atmosphere, so that the waste nickel-based 690 alloy is simulated and prepared), which comprises the following specific steps:
(1) Turning the surface of the waste alloy by 1mm, and removing surface oxide skin and greasy dirt;
(2) Selecting 6800g of waste alloy, randomly taking scraps at 6 different positions of the waste alloy, and detecting the content of oxygen, wherein the average value is 223ppm;
(3) Filling the waste alloy into a vacuum induction melting furnace, and vacuumizing to 10 percent -2 Pa, heating to 1500 ℃ to enable the waste alloy to be completely melted;
(4) Cooling to 1450 ℃, adding 5.04g of metal calcium (purity is 99.5%), and carrying out electromagnetic stirring for 30min;
(5) Heating to 1500deg.C, and standing for 15min;
(6) Slowly casting into an ingot at a constant speed, and cutting off a riser;
(7) Casting ingot at 1200 ℃ according to forging ratio of 2:1, forging;
(8) And (3) carrying out water quenching immediately after heat preservation for 30min at 1100 ℃ to obtain the calcium-added remelted alloy.
Example 2
The embodiment provides a waste nickel-based 617 alloy short-flow same-stage recycling method, which comprises the following specific steps:
(1) Turning 6000g of waste 617 alloy surface by 1mm, and removing surface oxide skin and greasy dirt;
(2) Randomly taking scraps at 6 different positions of the waste alloy to detect the oxygen content, wherein the average value is 205ppm;
(3) Filling the waste 617 alloy into a vacuum induction melting furnace, and vacuumizing to 10 percent -2 Pa, heating to 1500 ℃ to enable the waste alloy to be completely melted;
(4) Cooling to 1450 ℃, adding 5g of metal calcium (purity is 99.5%), and carrying out electromagnetic stirring for 30min;
(5) Heating to 1500deg.C, and standing for 15min;
(6) Slowly casting into an ingot at a constant speed, and cutting off a riser;
(7) Forging the cast ingot at 1200 ℃ according to a forging ratio of 2:1;
(8) water quenching immediately after heat preservation for 30min at 1150 ℃ to obtain the calcium-added remelted 617 alloy.
Comparative example 1
The comparative example provides a method for directly remelting waste nickel-based 690 alloy, which comprises the following specific steps:
(1) Turning 6000g of waste alloy surface for 1cm, and removing surface oxide skin and greasy dirt;
(2) Filling the waste alloy into a vacuum induction melting furnace, and vacuumizing to 10 percent -2 Pa, heating to 1500 ℃ to enable the waste alloy to be completely melted;
(3) Electromagnetic stirring for 30min;
(4) Slowly casting into an ingot at a constant speed, and cutting off a riser;
(5) Casting ingot at 1200 ℃ according to forging ratio of 2:1, forging;
(6) And (3) carrying out water quenching immediately after heat preservation for 30min at 1100 ℃ to obtain the direct remelted alloy.
Comparative example 2
The comparative example provides a recycling method of waste nickel-based 690 alloy, which comprises the following specific steps:
(1) Removing greasy dirt on the surface of the waste alloy;
(2) 6600g of waste alloy is selected, scraps are randomly taken from 6 different positions of the waste alloy, and the content of oxygen is detected, wherein the average value is 130ppm;
(3) Filling the waste alloy into a vacuum induction melting furnace, and vacuumizing to 10 percent -2 Pa, heating to 1500 ℃ to enable the waste alloy to be completely melted;
(4) 2.2g of carbon block (purity 99.9%) is added and stirred electromagnetically for 30min;
(5) Slowly casting into an ingot at a constant speed, and cutting off a riser;
(6) Casting ingot at 1200 ℃ according to forging ratio of 2:1, forging;
(7) And (3) carrying out water quenching immediately after heat preservation for 30min at 1100 ℃ to obtain the carbon-added remelted alloy.
Performance testing
The calcium-added remelted alloy prepared in example 1 has the main constituent elements substantially consistent with those of the standard alloy through chemical component detection, and has lower oxygen content than the standard alloy and the direct remelted alloy. The aluminum content is lower than that of standard alloy, direct remelted alloy and carbon added remelted alloy. The mechanical property detection shows that the room temperature plasticity and the high temperature plasticity of the calcium-added remelted alloy are higher than those of the standard alloy under the condition that the strength of the calcium-added remelted alloy is not lower than that of the standard alloy. The chemical composition and mechanical properties of the calcium-added remelted alloy are compared with those of standard alloys, direct remelted alloys and carbon-added remelted alloys are shown in tables 1 and 2.
The standard alloy is prepared by taking high-purity nickel, chromium, iron and carbon blocks (the purity is higher than 99%) as raw materials, smelting the raw materials at 1500 ℃ by adopting a vacuum induction smelting furnace, forging and carrying out solution treatment. Wherein, forging temperature 1100 ℃, forging ratio: 2:1, solid solution temperature: the temperature is 1100 ℃ and the heat preservation time is 30min.
Table 1 different 690 alloy chemistries (wt.%)
| Type(s) | Ni | Cr | Fe | Al | C | O |
| Standard alloy | Bal. | 29.94 | 8.98 | 0.014 | 0.0150 | 0.0130 |
| Directly and directlyRemelted alloy | Bal. | 29.65 | 7.64 | 0.032 | 0.0135 | 0.0225 |
| Carbon added remelted alloy | Bal. | 28.82 | 7.15 | 0.053 | 0.0430 | 0.0088 |
| Calcium-added remelted alloy | Bal. | 29.82 | 8.80 | <0.001 | 0.0130 | 0.0120 |
TABLE 2 mechanical Properties of different 690 alloys
FIG. 1 is a microstructure of different types 690 alloys; FIG. 2 is a room temperature tensile fracture morphology of different types of 690 alloys; FIG. 3 is a drawing fracture morphology at 650℃for different types of 690 alloys.
As shown in fig. 1 (a), foreign inclusion phase alumina is introduced during the preparation of the standard alloy. As shown in (d) of FIG. 1, the calcium-added remelted alloy matrix was clean and free of inclusion phases. As shown in fig. 1 (b), the direct remelted alloy matrix contained chromium oxide of a larger size. As shown in fig. 1 (c), the carbon-added remelted alloy contains an alumina inclusion phase and a carbide precipitation phase, although there is no chromium oxide inclusion phase. The result shows that the calcium-adding remelting method can effectively remove the chromium oxide and aluminum oxide inclusion phases in the waste alloy.
From the results of fig. 2, it can be seen that the fracture micro morphology of the calcium-added remelted alloy is similar to that of the standard alloy and the carbon-added remelted alloy, mainly is ductile pit, but has some differences; the standard alloy has larger ductile fossa, the carbon-added remelted alloy has small ductile fossa, but holes exist, and the calcium-added remelted alloy has small ductile fossa and no holes. The fracture microscopic morphology of the direct remelted alloy is mainly cleavage steps and shallower ductile pits. Indicating that the plasticity of the alloy remelted by calcium addition at room temperature is best.
As can be seen from the results of FIG. 3, the high temperature fracture micro-morphology of the four 690 alloys is very different. Standard alloy fracture ductile pits are very few and have tear characteristics. The directly remelted alloy fracture is ductile without pits and a large amount of scraps are present. Few carbide-added remelted alloy dimples are mainly cleavage planes. Although the calcium-added remelted alloy fracture has cleavage surfaces, the ductile cast is more and smaller. The plasticity of the alloy remelted by adding calcium at a high temperature of 650 ℃ is the best.
The same test proves that the calcium-adding remelting 617 alloy of the embodiment 2 is also superior to the direct remelting 617 alloy in performance.
It should be noted that endpoints and any values of the ranges disclosed herein are not limited to the precise range or value, and that such range or value should be understood to include values approaching such range or value. For numerical ranges, one or more new numerical ranges may be found between the endpoints of each range, between the endpoint of each range and the individual point value, and between the individual point value, in combination with each other, and are to be considered as specifically disclosed herein.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "detailed description," or "some embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the embodiments. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A short-process peer recycling method for waste nickel-base superalloy is characterized by comprising the steps of adding calcium into the waste nickel-base superalloy to remelt the waste nickel-base superalloy to obtain an alloy ingot, and then carrying out heat treatment.
2. The short-process peer recycling method of the waste nickel-base superalloy according to claim 1, wherein calcium is added in the form of metal calcium, the purity of the metal calcium is 99.5%, and the addition mass of the metal calcium is 2-5 times of the total oxygen content in the waste nickel-base superalloy.
3. The short-process peer recycling method of waste nickel-base superalloy as in claim 1, wherein the step of adding calcium for remelting comprises:
vacuumizing to reduce the vacuum degree to 10 -2 Pa; heating until the waste nickel-based superalloy is completely melted; cooling to 1450-1480 deg.C,adding metal calcium to perform oxide reduction; heating to above 1482 ℃, standing to enable calcium oxide to float up to the liquid level of the molten metal, and removing residual calcium at the same time; cooling and casting into ingots.
4. The method for the short-process peer recycling of the waste nickel-base superalloy according to claim 3, wherein electromagnetic stirring is continuously used in the reduction process of the oxide for 30-60min.
5. A method of short-process peer recycling of waste nickel-base superalloy as in any of claims 1-4, wherein the step of heat treating includes forging and solution treatment.
6. A method of short-process peer recycling of waste nickel-base superalloy as in claim 5, wherein the forging comprises forging at a forging ratio of 2:1-3:1 at 1000-1200 ℃.
7. The short-process peer recycling method of waste nickel-base superalloy as in claim 5, wherein the solution treatment comprises water quenching immediately after heat preservation at 1100-1200 ℃ for 30-60min.
8. The short-process peer recycling method of waste nickel-base superalloy according to any of claims 1-4, wherein the waste nickel-base superalloy is pretreated to remove scale and oil stains on the surface of the waste nickel-base superalloy before remelting with calcium.
9. The short-process peer recycling method of waste nickel-base superalloy as in any of claims 1-8, wherein the waste nickel-base superalloy is waste nickel-base 690 alloy, waste nickel-base 600 alloy, waste nickel-base 617 alloy, waste nickel-base 625 alloy or waste nickel-base 718 alloy.
10. The recycled nickel-base superalloy is characterized by being obtained by the waste nickel-base superalloy short-process peer recycling method according to any one of claims 1-9, wherein the strength and plasticity of the recycled nickel-base superalloy are better than those of a standard alloy at room temperature and 650 ℃.
Priority Applications (1)
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