CN116445787A - Nanometer eutectic Nb-Si high-temperature remelting alloy with high strength and room temperature toughness and preparation method thereof - Google Patents
Nanometer eutectic Nb-Si high-temperature remelting alloy with high strength and room temperature toughness and preparation method thereof Download PDFInfo
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- 229910045601 alloy Inorganic materials 0.000 title claims abstract description 71
- 239000000956 alloy Substances 0.000 title claims abstract description 71
- 229910020010 Nb—Si Inorganic materials 0.000 title claims abstract description 60
- 230000005496 eutectics Effects 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title abstract description 16
- 239000000126 substance Substances 0.000 claims abstract description 40
- 229910052751 metal Inorganic materials 0.000 claims abstract description 23
- 239000002184 metal Substances 0.000 claims abstract description 23
- 238000005303 weighing Methods 0.000 claims abstract description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 28
- 238000003723 Smelting Methods 0.000 claims description 22
- 229910052786 argon Inorganic materials 0.000 claims description 14
- 239000012856 weighed raw material Substances 0.000 claims description 13
- 239000012300 argon atmosphere Substances 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 12
- 238000005520 cutting process Methods 0.000 claims description 10
- 239000002245 particle Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 7
- 238000004140 cleaning Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 229910052710 silicon Inorganic materials 0.000 claims description 6
- 229910052719 titanium Inorganic materials 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 4
- 238000000313 electron-beam-induced deposition Methods 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims 5
- 238000005086 pumping Methods 0.000 claims 1
- 238000010894 electron beam technology Methods 0.000 abstract description 7
- 229910000676 Si alloy Inorganic materials 0.000 abstract description 2
- 238000005266 casting Methods 0.000 abstract description 2
- LIZIAPBBPRPPLV-UHFFFAOYSA-N niobium silicon Chemical compound [Si].[Nb] LIZIAPBBPRPPLV-UHFFFAOYSA-N 0.000 abstract description 2
- 239000002994 raw material Substances 0.000 abstract 1
- 239000010936 titanium Substances 0.000 description 14
- 230000006835 compression Effects 0.000 description 10
- 238000007906 compression Methods 0.000 description 10
- 229910000601 superalloy Inorganic materials 0.000 description 8
- 239000002131 composite material Substances 0.000 description 5
- 210000001787 dendrite Anatomy 0.000 description 5
- 229910021332 silicide Inorganic materials 0.000 description 5
- FVBUAEGBCNSCDD-UHFFFAOYSA-N silicide(4-) Chemical compound [Si-4] FVBUAEGBCNSCDD-UHFFFAOYSA-N 0.000 description 5
- 238000007711 solidification Methods 0.000 description 5
- 230000008023 solidification Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000004781 supercooling Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010892 electric spark Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000005501 phase interface Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
- C22C27/02—Alloys based on vanadium, niobium, or tantalum
-
- 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
- C22B9/22—Remelting metals with heating by wave energy or particle radiation
- C22B9/228—Remelting metals with heating by wave energy or particle radiation by particle radiation, e.g. electron beams
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/02—Making non-ferrous alloys by melting
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
- C22C32/0047—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with carbides, nitrides, borides or silicides as the main non-metallic constituents
Abstract
A nano eutectic Nb-Si high-temperature remelted alloy with high strength and room temperature toughness and a preparation method thereof relate to a Nb-Si high-temperature remelted alloy and a preparation method thereof. The invention aims to solve the problems of low room temperature toughness and high temperature strength caused by coarse niobium-silicon alloy ingot casting structure. Nano eutectic Nb-Si high temperature remelted alloy: according to atomic percentage, the chemical formula of the alloy is Nb-16Si-20Ti-1ZrC-xSc, wherein x is 0.02-0.5; preparation: 1. weighing raw materials; 2. preparing an ingot; 3. preparing a metal plate; 4. remelting by an electron beam; the invention is used for the nano eutectic Nb-Si high-temperature remelting alloy with high strength and room temperature toughness and the preparation thereof.
Description
Technical Field
The invention relates to a Nb-Si high-temperature remelted alloy and a preparation method thereof.
Background
With advances and developments in technology and society, high performance aircraft engines are increasingly demanded. The heat carrying capacity of the engine blades and other hot end components determines the thrust-to-weight ratio of the engine. The existing widely applied vane material-Ni-based monocrystal is limited by the fact that the melting point is difficult to meet the requirement of the next-generation engine on high thrust-weight ratio, and on the basis of the smelting point, the development of a material with higher melting point and more excellent high-temperature performance for meeting the temperature bearing capacity of the vane material of the engine has profound significance.
Nb-Si alloys are generally composed of a room temperature toughened Nbss phase and a high temperature reinforced silicide phase, with melting points up to 1900 ℃ and densities of only 7g/cm 3 ～7.2g/cm 3 Is a potential high temperature material for replacing Ni-based single crystals. However, the existing Nb-Si-based alloy preparation technology includes arc melting, directional solidification and the like, and the obtained microstructure is coarse, and particularly, the large-size silicide phase remarkably deteriorates the room temperature toughness and the high temperature strength, and becomes an important "barrier" for preventing the Nb-Si-based alloy from being applied. Thus, finding a suitable processing and preparation process for preparing the nano-scale eutectic Nb-Si superalloy is important.
Disclosure of Invention
The invention aims to solve the problems of low room temperature toughness and high temperature strength caused by coarse niobium-silicon alloy ingot casting structure, and further provides a nano eutectic Nb-Si high temperature remelting alloy with high strength and room temperature toughness and a preparation method thereof.
A nano eutectic Nb-Si high temperature remelted alloy with high strength and room temperature toughness has a chemical formula of Nb-16Si-20Ti-1ZrC-xSc according to atomic percent, wherein x is 0.02-0.5.
The preparation method of the nano eutectic Nb-Si high-temperature remelted alloy with high strength and room temperature toughness comprises the following steps:
1. weighing simple substance Si, simple substance Ti, zrC, simple substance Sc and simple substance Nb according to the proportion of 16% Si, 20% Ti, 1% ZrC, x% Sc and 63-x% Nb by atomic percentage to obtain a weighed raw material; x is 0.02-0.5;
2. sequentially placing the weighed raw materials into a smelting chamber from bottom to top according to the particle size from small to large, and smelting in an argon atmosphere to obtain an ingot;
3. cutting the cast ingot into plates, polishing to remove linear cutting marks, and finally cleaning to obtain a metal plate;
4. fixing a metal plate on an electron beam deposition chamber platform, vacuumizing, introducing protective argon, preheating the metal plate by using a beam current of 10 mA-15 mA, remelting the preheated metal plate by using a beam current of 24 mA-26 mA under the condition that the moving speed is 100 mm/min-400 mm/min, and finally cooling along with a furnace to obtain the nano eutectic Nb-Si high-temperature remelting alloy with high strength and room temperature toughness.
The beneficial effects of the invention are as follows:
1. the invention adopts ZrC and Sc materials because ZrC can promote large-size Nb in Nb-Si-based alloy 3 Decomposition of Si phase into eutectic Nbss/Nb 5 Si 3 The structure is that Sc is added to be enriched at the front edge of a solid-liquid interface to form component supercooling in the preparation process, so that eutectic Nbss/Nb is further refined 5 Si 3 The structure, thus promote room temperature toughness and strength of Nb-Si-based alloys;
2. the Nb-Si-based alloy is prepared by adopting an electron beam remelting mode, and nano eutectic Nbss/Nb can be obtained due to deep undercooling 5 Si 3 The Nb-Si superalloy with a microstructure, and the eutectic microstructure with a small size can uniformly distribute stress concentration generated in the fracture process due to more phase interfaces, so that the room-temperature toughness and strength of the Nb-Si-based alloy are further improved;
3. the invention uses the beam intensity and scanning rate in the electron beam remelting technology to control the temperature gradient and supercooling degree of the Nb-Si-based superalloy during solidification, thereby controlling the crystal morphology and the growth direction of the solidification structure and obtaining the dendrite morphology structure with two-phase composite growth. The Nb-16Si-20Ti-1ZrC-xSc alloy (x is 0.02-0.5) designed by the invention has high strength and room temperature toughness: the room temperature fracture toughness is up to 22 MPa.m 1/2 ～40MPa·m 1/2 The room temperature compression strength reaches 2200MPa to 2800MPa, and the high temperature compression strengthThe alloy has excellent room temperature toughness and strength performance of 391 MPa-456 MPa, and is a Nb-Si-based superalloy with great potential.
The invention is used for a nano eutectic Nb-Si high-temperature remelting alloy with high strength and room temperature toughness and a preparation method thereof.
Drawings
FIG. 1 is a microstructure of Nb-16Si-20Ti-1ZrC-0.02Sc remelted alloy prepared in example one;
FIG. 2 is a microstructure of Nb-16Si-20Ti-1ZrC-0.05Sc remelted alloy prepared in example two;
FIG. 3 is a microstructure of Nb-16Si-20Ti-1ZrC-0.5Sc remelted alloy prepared in example three;
FIG. 4 is a graph of room temperature fracture toughness of remelted Nb-Si alloys prepared in examples one to three;
FIG. 5 is a graph of room temperature compressive strength of remelted Nb-Si alloys prepared in examples one to three;
FIG. 6 is a graph of the high temperature (1200 ℃) compressive strength of remelted Nb-Si alloys prepared in examples one to three.
Detailed Description
The first embodiment is as follows: according to the nano eutectic Nb-Si high-temperature remelted alloy with high strength and room temperature toughness, the chemical formula of the nano eutectic Nb-Si high-temperature remelted alloy is Nb-16Si-20Ti-1ZrC-xSc according to atomic percentage, wherein x is 0.02-0.5.
The beneficial effects of this embodiment are:
1. the present embodiment uses both ZrC and Sc because ZrC can promote large-sized Nb in Nb-Si-based alloys 3 Decomposition of Si phase into eutectic Nbss/Nb 5 Si 3 The structure is that Sc is added to be enriched at the front edge of a solid-liquid interface to form component supercooling in the preparation process, so that eutectic Nbss/Nb is further refined 5 Si 3 The structure, thus promote room temperature toughness and strength of Nb-Si-based alloys;
2. the Nb-Si-based alloy is prepared by adopting an electron beam remelting mode, and nano eutectic Nbss/Nb can be obtained due to deep undercooling 5 Si 3 Nb-Si superalloy with microstructure, fine eutectic structure can be uniform due to more phase interfacesStress concentration generated in the distributed fracture process, thereby further improving the room temperature toughness and strength of the Nb-Si-based alloy;
3. the method utilizes the beam intensity and the scanning rate in the electron beam remelting technology to control the temperature gradient and the supercooling degree of the Nb-Si-based superalloy during solidification, and further controls the crystal morphology and the growth direction of a solidification structure, thereby obtaining the dendrite morphology structure with two-phase composite growth. The Nb-16Si-20Ti-1ZrC-xSc alloy (x is 0.02-0.5) designed in the embodiment has high strength and room temperature toughness: the room temperature fracture toughness is up to 22 MPa.m 1/2 ～40MPa·m 1/2 The room temperature compression strength reaches 2200-2800 MPa, the high temperature compression strength is 391-456 MPa, and the alloy has excellent room temperature toughness and strength performance, thus being a Nb-Si-based superalloy with great potential.
The second embodiment is as follows: the preparation method of the nano eutectic Nb-Si high-temperature remelted alloy with high strength and room temperature toughness is carried out according to the following steps:
1. weighing simple substance Si, simple substance Ti, zrC, simple substance Sc and simple substance Nb according to the proportion of 16% Si, 20% Ti, 1% ZrC, x% Sc and 63-x% Nb by atomic percentage to obtain a weighed raw material; x is 0.02-0.5;
2. sequentially placing the weighed raw materials into a smelting chamber from bottom to top according to the particle size from small to large, and smelting in an argon atmosphere to obtain an ingot;
3. cutting the cast ingot into plates, polishing to remove linear cutting marks, and finally cleaning to obtain a metal plate;
4. fixing a metal plate on an electron beam deposition chamber platform, vacuumizing, introducing protective argon, preheating the metal plate by using a beam current of 10 mA-15 mA, remelting the preheated metal plate by using a beam current of 24 mA-26 mA under the condition that the moving speed is 100 mm/min-400 mm/min, and finally cooling along with a furnace to obtain the nano eutectic Nb-Si high-temperature remelting alloy with high strength and room temperature toughness.
And a third specific embodiment: the second difference between this embodiment and the second embodiment is that: the second step is describedThe argon atmosphere is introduced specifically according to the following steps: firstly, vacuumizing a smelting chamber to 10 Pa-20 Pa, then introducing protective argon for 10 s-20 s, repeating vacuumizing and argon introducing for three times, and vacuumizing to 3X 10 -3 Pa～4×10 -3 Pa, and finally introducing protective argon to 400 Pa-500 a. The other is the same as in the second embodiment.
The specific embodiment IV is as follows: this embodiment differs from the second or third embodiment in that: and in the second step, smelting is carried out under the condition of argon atmosphere and current of 600A. The other is the same as the second or third embodiment.
Fifth embodiment: the present embodiment differs from the second to fourth embodiments in that: and in the second step, smelting is repeated for 6-7 times under the argon atmosphere. The other embodiments are the same as those of the second to fourth embodiments.
Specific embodiment six: this embodiment differs from one of the second to fifth embodiments in that: and step two, sequentially placing the weighed raw materials into a smelting chamber from bottom to top according to the particle size from small to large, smelting elemental Ti under the argon atmosphere, and then smelting other weighed raw materials to obtain an ingot. The other embodiments are the same as those of the second to fifth embodiments.
In order to further reduce the oxygen content in the smelting chamber, titanium sponge particles are first smelted.
Seventh embodiment: this embodiment differs from one of the second to sixth embodiments in that: and thirdly, polishing by using 800# water-based abrasive paper to remove linear cutting traces, and finally cleaning by using alcohol. The other embodiments are the same as those of the second to sixth embodiments.
Eighth embodiment: this embodiment differs from one of the second to seventh embodiments in that: vacuumizing to 3×10 -3 Pa～4×10 -3 Pa, and then introducing protective argon to 200-500 Pa. The other embodiments are the same as those of the second to seventh embodiments.
Detailed description nine: this embodiment differs from one of the second to eighth embodiments in that: and step four, remelting the preheated metal plate by using a beam current with the current of 25mA under the condition that the moving speed is 100-400 mm/min. The other embodiments are the same as those of the second to eighth embodiments.
Detailed description ten: this embodiment differs from one of the second to ninth embodiments in that: and step four, remelting the preheated metal plate under the condition that the moving speed is 400mm/min by using a beam current with the current of 25 mA. The others are the same as in embodiments two to nine.
The following examples are used to verify the benefits of the present invention:
embodiment one:
a nano eutectic Nb-Si high temperature remelted alloy with high strength and room temperature toughness has a chemical formula of Nb-16Si-20Ti-1ZrC-0.02Sc according to atomic percent.
The preparation method of the nano eutectic Nb-Si high-temperature remelted alloy with high strength and room temperature toughness comprises the following steps:
1. weighing simple substance Si, simple substance Ti, zrC, simple substance Sc and simple substance Nb according to the proportion of 16% Si, 20% Ti, 1% ZrC, 0.02% Sc and 62.98% Nb by atomic percentage to obtain a weighed raw material;
2. placing the weighed raw materials into a non-consumable water-cooled copper crucible from bottom to top in turn according to the particle size from small to large, then placing into a smelting chamber, vacuumizing the smelting chamber to 15Pa by a mechanical pump, then introducing protective argon for 20s, repeating vacuumizing and argon introducing for three times, and vacuumizing the smelting chamber to 3X 10 by a molecular pump -3 Pa, finally introducing protective argon to 500Pa, then firstly smelting simple substance Ti under the condition of argon atmosphere and current of 600A, then smelting other weighed raw materials, and repeatedly smelting for 6 times to obtain cast ingots;
3. cutting the cast ingot into plates by adopting electric sparks, polishing by adopting 800# water abrasive paper to remove linear cutting marks, and finally cleaning by adopting alcohol to obtain a metal plate;
4. fixing the metal plate on the platform of the electron beam deposition chamber, and vacuumizing to 3×10 -3 Pa, then introducing protective argon to 200Pa, preheating the metal plate by using a beam with current of 15mA, and then using a beam with current of 25mA at a moving speed of 100mmRemelting the preheated metal plate under the condition of/min, and finally cooling along with a furnace to obtain the nano eutectic Nb-Si high-temperature remelted alloy with high strength and room temperature toughness, namely the Nb-16Si-20Ti-1ZrC-0.02Sc remelted alloy.
The simple substance Si in the first step is small-size blocky crystals with the size of 3 nm-5 mm, the simple substance Ti is a sponge block with the size of 2 mm-4 mm, the ZrC is powder with the particle size of 400 meshes, the simple substance Sc is thread with the diameter of 1mm, and the simple substance Nb is a small-size plate with the size of 10mm multiplied by 1 mm;
the ZrC, the simple substance Sc, the simple substance Ti, the simple substance Si and the simple substance Nb are sequentially arranged from bottom to top in the second step;
FIG. 1 is a microstructure of Nb-16Si-20Ti-1ZrC-0.02Sc remelted alloy prepared in example one; as can be seen from the figure, the Nb-16Si-20Ti-1ZrC-0.02Sc remelted alloy in the first embodiment has a fine structure, is a dendrite structure formed by two phases in a composite manner, and is Nbss/Nb 5 Si 3 The eutectic structure phase size is 500 nm-900 nm, and no large-size primary silicide phase exists.
Embodiment two: the first difference between this embodiment and the first embodiment is that: the nano eutectic Nb-Si high temperature remelted alloy with high strength and room temperature toughness has a chemical general formula of Nb-16Si-20Ti-1ZrC-0.05Sc according to atomic percent; weighing simple substance Si, simple substance Ti, zrC, simple substance Sc and simple substance Nb according to the proportion of 16% Si, 20% Ti, 1% ZrC, 0.05% Sc and 62.95% Nb in atomic percentage; and step four, remelting the preheated metal plate under the condition of the moving speed of 200mm/min by using a beam current with the current of 25 mA. The other is the same as in the first embodiment.
FIG. 2 is a microstructure of Nb-16Si-20Ti-1ZrC-0.05Sc remelted alloy prepared in example two; as can be seen from the graph, the Nb-16Si-20Ti-1ZrC-0.05Sc remelted alloy in the second embodiment has a fine structure, is a dendrite structure formed by two-phase composite growth, and is Nbss/Nb 5 Si 3 The eutectic structure phase size is 700 nm-900 nm, and no large-size primary silicide phase exists.
Embodiment III: the first difference between this embodiment and the first embodiment is that: the nano eutectic Nb-Si high temperature remelted alloy with high strength and room temperature toughness has a chemical general formula of Nb-16Si-20Ti-1ZrC-0.5Sc according to atomic percent; in the first step, the simple substance Si, the simple substance Ti, the ZrC, the simple substance Sc and the simple substance Nb are weighed according to the proportion of 16 percent of Si, 20 percent of Ti, 1 percent of ZrC, 0.5 percent of Sc and 62.5 percent of Nb in atomic percentage; and step four, remelting the preheated metal plate under the condition of the moving speed of 400mm/min by using a beam current with the current of 25 mA. The other is the same as in the first embodiment.
FIG. 3 is a microstructure of Nb-16Si-20Ti-1ZrC-0.5Sc remelted alloy prepared in example three; as can be seen from the figure, the structure of the three Nb-16Si-20Ti-1ZrC-0.5Sc remelted alloy of the embodiment is fine and is a dendrite structure formed by two phases in a composite way, and Nbss/Nb 5 Si 3 The eutectic structure phase size is different from 400nm to 600nm, and no large-size primary silicide phase exists.
Room temperature fracture toughness experiments were performed on the remelted alloys prepared in examples one to three at a loading rate of 0.2mm/min, and room temperature compressive strength experiments were performed on the remelted alloys prepared in examples one to three at a loading rate of 0.5 mm/min; carrying out a 1200 ℃ compressive strength experiment on the remelted alloys prepared in examples one to three under the condition of a loading rate of 0.5 mm/min; FIG. 4 is a graph of room temperature fracture toughness of remelted Nb-Si alloys prepared in examples one to three; FIG. 5 is a graph of room temperature compressive strength of remelted Nb-Si alloys prepared in examples one to three; FIG. 6 is a graph of the high temperature (1200 ℃) compressive strength of remelted Nb-Si alloys prepared in examples one to three. The remelted Nb-Si alloy prepared in example one had a room temperature fracture toughness of 22.6 MPa.m 1 /2 The room temperature compression strength is 2241MPa, and the high temperature compression strength is 391MPa. The remelted Nb-Si alloy prepared in example two had a room temperature fracture toughness of 28.6 MPa.m 1/2 The room temperature compression strength is 2355MPa, and the high temperature compression strength is 428MPa. The remelted Nb-Si alloy prepared in example three had a room temperature fracture toughness of 39.1 MPa.m 1/2 The room temperature compression strength is 2757MPa, and the high temperature compression strength is 456MPa. In summary, the nano eutectic Nb-Si superalloy prepared by electron beam remelting in the first to third embodiments has the advantages of strength, toughness and excellent mechanical properties. As can be seen from fig. 4-6, as the electron beam scanning rate increases,room temperature fracture toughness, room temperature and high temperature compressive strength gradually increase.
Claims (10)
1. A nano eutectic Nb-Si high temperature remelting alloy with high strength and room temperature toughness is characterized in that the chemical formula of the alloy is Nb-16Si-20Ti-1ZrC-xSc according to atomic percent, wherein x is 0.02-0.5.
2. The method for preparing the nano eutectic Nb-Si high temperature remelted alloy with high strength and room temperature toughness according to claim 1 is characterized by comprising the following steps:
1. weighing simple substance Si, simple substance Ti, zrC, simple substance Sc and simple substance Nb according to the proportion of 16% Si, 20% Ti, 1% ZrC, x% Sc and 63-x% Nb by atomic percentage to obtain a weighed raw material; x is 0.02-0.5;
2. sequentially placing the weighed raw materials into a smelting chamber from bottom to top according to the particle size from small to large, and smelting in an argon atmosphere to obtain an ingot;
3. cutting the cast ingot into plates, polishing to remove linear cutting marks, and finally cleaning to obtain a metal plate;
4. fixing a metal plate on an electron beam deposition chamber platform, vacuumizing, introducing protective argon, preheating the metal plate by using a beam current of 10 mA-15 mA, remelting the preheated metal plate by using a beam current of 24 mA-26 mA under the condition that the moving speed is 100 mm/min-400 mm/min, and finally cooling along with a furnace to obtain the nano eutectic Nb-Si high-temperature remelting alloy with high strength and room temperature toughness.
3. The method for preparing nano eutectic Nb-Si high temperature remelted alloy with high strength and room temperature toughness according to claim 2, wherein the argon atmosphere in the second step is specifically introduced as follows: firstly, vacuumizing a smelting chamber to 10 Pa-20 Pa, then introducing protective argon for 10 s-20 s, repeating vacuumizing and argon introducing for three times, and vacuumizing to 3X 10 -3 Pa～4×10 -3 Pa, finally introducing protective argonTo 400 Pa-500 a.
4. The method for producing a nano eutectic Nb-Si high temperature remelted alloy having both high strength and room temperature toughness according to claim 2, wherein in the second step, melting is performed under an argon atmosphere and a current of 600A.
5. The method for producing a nano eutectic Nb-Si high temperature remelted alloy having both high strength and room temperature toughness according to claim 4, wherein the melting is repeated 6 to 7 times in the argon atmosphere in the second step.
6. The method for preparing the nano eutectic Nb-Si high-temperature remelting alloy with high strength and room temperature toughness, which is characterized in that in the second step, the weighed raw materials are sequentially placed in a smelting chamber from bottom to top according to the particle size from small to large, elemental Ti is smelted first in an argon atmosphere, and then other weighed raw materials are smelted to obtain an ingot.
7. The method for preparing the nano eutectic Nb-Si high-temperature remelting alloy with high strength and room temperature toughness according to claim 2, wherein in the third step, 800# water-based abrasive paper is adopted for polishing to remove linear cutting marks, and finally alcohol is adopted for cleaning.
8. The method for producing a nano eutectic Nb-Si high temperature remelted alloy having both high strength and room temperature toughness according to claim 2, characterized by vacuum pumping to 3×10 in step four -3 Pa～4×10 -3 Pa, and then introducing protective argon to 200-500 Pa.
9. The method for producing a nano eutectic Nb-Si high temperature remelting alloy having both high strength and room temperature toughness according to claim 2, wherein in the fourth step, the preheated metal plate is remelted by a beam current of 25mA at a moving speed of 100mm/min to 400 mm/min.
10. The method for producing a nano eutectic Nb-Si high temperature remelting alloy having both high strength and room temperature toughness according to claim 2, wherein in the fourth step, the preheated metal plate is remelted by a beam current of 25mA at a moving speed of 400 mm/min.
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| DEZHI CHEN ET AL.: "An as-cast Nb-Si-based alloy with fine-grains and remarkable fracture toughness by minor Sc addition", JOURNAL OF ALLOYS AND COMPOUNDS, no. 895, 20 November 2021 (2021-11-20), pages 1 * |
| А.В.ЕЛЮТИН等著，马福康等翻译: "铌与钽", 30 November 1997, 中南工业大学出版社, pages: 255 * |
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