CN114210981A - Preparation method of titanium steel composite part - Google Patents
Preparation method of titanium steel composite part Download PDFInfo
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- CN114210981A CN114210981A CN202111493841.7A CN202111493841A CN114210981A CN 114210981 A CN114210981 A CN 114210981A CN 202111493841 A CN202111493841 A CN 202111493841A CN 114210981 A CN114210981 A CN 114210981A
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- 239000002131 composite material Substances 0.000 title claims abstract description 66
- 229910001200 Ferrotitanium Inorganic materials 0.000 title claims abstract description 30
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 70
- 238000010438 heat treatment Methods 0.000 claims abstract description 53
- 238000001816 cooling Methods 0.000 claims abstract description 35
- 239000000843 powder Substances 0.000 claims abstract description 22
- 239000002245 particle Substances 0.000 claims abstract description 17
- 238000002156 mixing Methods 0.000 claims abstract description 14
- 238000005245 sintering Methods 0.000 claims abstract description 14
- 239000011261 inert gas Substances 0.000 claims abstract description 12
- 238000005086 pumping Methods 0.000 claims abstract description 12
- 239000011230 binding agent Substances 0.000 claims abstract description 7
- 238000004519 manufacturing process Methods 0.000 claims abstract description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 77
- 239000010959 steel Substances 0.000 claims description 77
- 239000002994 raw material Substances 0.000 claims description 37
- 238000005496 tempering Methods 0.000 claims description 22
- 238000000498 ball milling Methods 0.000 claims description 20
- 238000002347 injection Methods 0.000 claims description 17
- 239000007924 injection Substances 0.000 claims description 17
- 238000000227 grinding Methods 0.000 claims description 11
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- 239000012535 impurity Substances 0.000 claims description 10
- 230000006698 induction Effects 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000003801 milling Methods 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 229910052802 copper Inorganic materials 0.000 claims description 5
- 239000007789 gas Substances 0.000 claims description 5
- 238000010907 mechanical stirring Methods 0.000 claims description 5
- 238000002844 melting Methods 0.000 claims description 5
- 230000008018 melting Effects 0.000 claims description 5
- 229910052754 neon Inorganic materials 0.000 claims description 5
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 claims description 5
- 238000005498 polishing Methods 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 229910052759 nickel Inorganic materials 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 3
- 229910052745 lead Inorganic materials 0.000 claims description 2
- 229910052750 molybdenum Inorganic materials 0.000 claims description 2
- 229910052758 niobium Inorganic materials 0.000 claims description 2
- 230000007547 defect Effects 0.000 abstract description 5
- 229910001069 Ti alloy Inorganic materials 0.000 abstract description 4
- 230000003068 static effect Effects 0.000 abstract description 4
- 239000000203 mixture Substances 0.000 abstract description 3
- 239000010936 titanium Substances 0.000 description 6
- 229910052719 titanium Inorganic materials 0.000 description 6
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229910001339 C alloy Inorganic materials 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- WPBNNNQJVZRUHP-UHFFFAOYSA-L manganese(2+);methyl n-[[2-(methoxycarbonylcarbamothioylamino)phenyl]carbamothioyl]carbamate;n-[2-(sulfidocarbothioylamino)ethyl]carbamodithioate Chemical compound [Mn+2].[S-]C(=S)NCCNC([S-])=S.COC(=O)NC(=S)NC1=CC=CC=C1NC(=S)NC(=O)OC WPBNNNQJVZRUHP-UHFFFAOYSA-L 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- QMQXDJATSGGYDR-UHFFFAOYSA-N methylidyneiron Chemical compound [C].[Fe] QMQXDJATSGGYDR-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- GPPXJZIENCGNKB-UHFFFAOYSA-N vanadium Chemical compound [V]#[V] GPPXJZIENCGNKB-UHFFFAOYSA-N 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F3/26—Impregnating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1003—Use of special medium during sintering, e.g. sintering aid
- B22F3/1007—Atmosphere
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/22—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip
- B22F3/225—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces for producing castings from a slip by injection molding
-
- 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
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/18—Hardening; Quenching with or without subsequent tempering
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/42—Ferrous alloys, e.g. steel alloys containing chromium with nickel with copper
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/44—Ferrous alloys, e.g. steel alloys containing chromium with nickel with molybdenum or tungsten
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C38/00—Ferrous alloys, e.g. steel alloys
- C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
- C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
- C22C38/46—Ferrous alloys, e.g. steel alloys containing chromium with nickel with vanadium
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2998/00—Supplementary information concerning processes or compositions relating to powder metallurgy
- B22F2998/10—Processes characterised by the sequence of their steps
Abstract
The invention relates to the technical field of manufacturing, and discloses a preparation method of a titanium steel composite part, which comprises the steps of uniformly mixing titanium powder with average particle sizes of 45.74, 35.12 and 23.46 mu m according to a weight ratio of 70:20:10, then placing the mixture in a vacuum-pumping container filled with inert gas for heating for a certain time at high temperature, then adding the titanium powder into binder particles at intervals of seven minutes at 190-195 ℃, cooling to 175-180 ℃ for mixing for 1 hour after all the powder is added, and cooling to obtain a feed. According to the preparation method of the titanium steel composite part, the titanium powder with various particle sizes is adopted for optimized proportioning and fully and uniformly mixed, and then high-vacuum sintering is carried out to obtain the titanium steel part with high dimensional accuracy, uniform tissue structure and high performance, so that the titanium steel part has excellent stress resistance and static tension performance, and the defects of poor wear resistance and high-temperature performance of the original titanium alloy and the like are overcome.
Description
Technical Field
The invention relates to the technical field of manufacturing, in particular to a preparation method of a titanium steel composite part.
Background
Titanium has small density, high specific strength, strong heat resistance and good biocompatibility, the density of the titanium is 4.51g/cm3, which is equivalent to 57 percent of steel, and the titanium is widely applied to the fields of medicine, sports, petrochemical industry, aerospace, metallurgy light industry and the like. However, titanium is an active metal and is very easily oxidized and reacts with other substances at a high temperature to form compounds, thereby seriously affecting the processing and performance of the titanium.
The steel is a general term for iron-carbon alloys with a carbon content between 0.02% and 2.11% by mass. The chemical composition of the steel can vary greatly, and steels containing only carbon elements are called carbon steels (carbon steels) or ordinary steels; in actual production, steel often contains different alloying elements according to different applications, such as: manganese, nickel, vanadium, and the like. The history of steel application and research by mankind has been long, but until the 19 th century bainitic process was invented, steel production was a costly and inefficient task. Nowadays, steel is one of the most used materials in the world due to its inexpensive, reliable properties, and is an indispensable component in the construction industry, manufacturing industry, and people's daily life.
The titanium steel composite material has excellent stress resistance and static tension resistance, overcomes the defects of poor wear resistance and high temperature performance of the original titanium alloy, and the like, and the cost is extremely high when the titanium steel composite part is prepared by adopting the traditional processing method at present.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a preparation method of a titanium steel composite part.
(II) technical scheme
To achieve the above objectThe invention provides the following technical scheme: a preparation method of a titanium steel composite part comprises the steps of uniformly mixing titanium powder with average particle sizes of 45.74 micrometers, 35.12 micrometers and 23.46 micrometers according to a weight ratio of 70:20:10, then placing the mixture in a vacuum-pumping container filled with inert gas for heating for a certain time at a high temperature, then adding the titanium powder into binder particles at a temperature of 190-195 ℃ at intervals of seven minutes, cooling to 175-180 ℃ after all the powder is added, mixing for 1 hour, and cooling to obtain a feed material; then injecting the titanium part green body into the titanium part green body at an injection pressure of 70-80 MPa, a pressure maintaining pressure of 80-85 MPa, an injection speed of 55-65 mm/S and a cooling time of 12S, introducing molten steel, oscillating, and then heating the titanium part green body at a temperature rising rate of 6 ℃/min, a temperature of 1300-1400 ℃, a time of 75min and a vacuum degree of 1x10-3And Pa, sintering to obtain the titanium part.
Preferably, the vacuum degree of the vacuum pumping is 5-102Pa, the pressure of the inert gas is 0.04-0.09MPa, and argon or neon is preferred.
Preferably, the milling is ball milling, vibration or stirring, preferably mechanical ball milling, mechanical vibration or mechanical stirring, more preferably the ball milling frequency is 15-40Hz, and the ball milling time is 4-10 hours.
Preferably, the molten steel is pretreated molten steel, and the pretreatment comprises the following steps:
s1, obtaining a steel billet;
s2, cleaning the billet raw material, removing various impurities on the surface, then heating the billet raw material in a medium-frequency induction heating furnace, introducing protective gas into the medium-frequency induction heating furnace to prevent the billet raw material from being oxidized in heating, heating the billet raw material to about 800 ℃, then stopping heating to keep the temperature of the billet raw material for about 30min, after the temperature is kept, heating the billet again to about 1100 ℃, and adding the following raw materials in parts by weight: cr trace to 4.5%, Mo trace to 2.0%, Ni trace to 4.5%, V trace to 0.5%, Cu trace to 4%, Al trace to 0.060%, Ca trace to 0.050%, B trace to 0.01%, Te trace to 0.020%, Se trace to 0.040%, Pb trace to 0.070%, and Nb trace to 0.050%, to obtain a composite steel blank;
s3, taking out the composite steel blank obtained in the step S2, putting the composite steel blank into oil, cooling to 445-455 ℃, taking out the composite steel blank, putting the composite steel blank into air, and air-cooling to room temperature;
s4, continuously tempering the composite steel at room temperature twice at the same temperature of 555-565 ℃; tempering the composite steel after twice tempering again, wherein the tempering temperature is 395-405 ℃;
and S5, heating and melting the composite steel in the S4 into molten steel for standby.
Preferably, the feed comprises the following raw materials in parts by weight: 3.5% of Cr, 1.5% of Mo, 3.0% of Ni, 0.3% of V, 3% of Cu, 0.04% of Al, 0.03% of Ca, 0.007% of B, 0.016% of Te, 0.03% of Se, 0.03% of Pb and 0.03% of Nb.
Preferably, the feed comprises the following raw materials in parts by weight: 2.8% of Cr, 1.6% of Mo, 3.6% of Ni, 0.4% of V, 3% of Cu, 0.03% of Al, 0.04% of Ca, 0.004% of B, 0.015% of Te, 0.03% of Se, 0.04% of Pb and 0.04% of Nb.
Preferably, the titanium part obtained by sintering is subjected to impurity removal on the surface of the base layer by adopting a sanding belt or a milling machine.
Preferably, the titanium part obtained by sintering is respectively subjected to grinding and polishing treatment in sequence, so that the thickness of the treated titanium part is 92-98% of the thickness of the titanium part before treatment.
The invention provides a preparation method of a titanium steel composite part, which aims to solve another technical problem and comprises the following steps:
1) uniformly mixing titanium powder with average particle sizes of 45.74, 35.12 and 23.46 mu m according to the weight ratio of 70:20: 10;
2) grinding the titanium powder in the step one to obtain primary powder;
3) placing the preliminary powder in a vacuum-pumping container filled with inert gas for protection, and heating for a certain time at a high temperature;
4) cooling the preliminary powder heated in the third step, adding titanium powder into the binder particles at 190-195 ℃ at intervals of seven minutes, cooling to 175-180 ℃ after all the powder is added, mixing for 1 hour, and cooling to obtain a feed material;
5) injecting the feed into a titanium part green body at an injection temperature of 170-180 ℃, an injection pressure of 70-80 MPa, a pressure maintaining pressure of 80-85 MPa, an injection speed of 55-65 mm/S and a cooling time of 12S;
6) introducing molten steel into the titanium part green body at the temperature of 160-180 ℃, and oscillating;
7) sintering the titanium part green body at the temperature rise rate of 6 ℃/min, the temperature of 1300-1400 ℃, the time of 75min and the vacuum degree of 1x10-3Pa to obtain the titanium part.
(III) advantageous effects
Compared with the prior art, the invention provides a preparation method of a titanium steel composite part, which has the following beneficial effects:
according to the preparation method of the titanium steel composite part, the titanium powder with various particle sizes is adopted for optimized proportioning and fully and uniformly mixed, and then high-vacuum sintering is carried out to obtain the titanium steel part with high dimensional accuracy, uniform tissue structure and high performance, so that the titanium steel part has excellent stress resistance and static tension performance, and the defects of poor wear resistance and high-temperature performance of the original titanium alloy and the like are overcome.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
a preparation method of a titanium steel composite part comprises the following steps:
1) uniformly mixing titanium powder with average particle sizes of 45.74, 35.12 and 23.46 mu m according to the weight ratio of 70:20: 10;
2) the titanium powder in the step one is ground to obtain primary powder, and the grinding is ball milling, vibration or stirring, preferably mechanical ball milling, mechanical vibration or mechanical stirring, more preferably the ball milling frequency is 30Hz, and the ball milling time is 6 hours;
3) placing the primary powder in a vacuum-pumping container filled with inert gas for protection, heating at high temperature for a certain time, wherein the vacuum degree of the vacuum-pumping is 5-102Pa, the pressure of inert gas is 0.06MPa, preferably argon or neon;
4) cooling the primary powder heated in the third step, adding titanium powder into the binder particles at 194 ℃ at intervals of seven minutes, cooling to 176 ℃ after all the powder is added, mixing for 1 hour, and cooling to obtain a feed;
5) injecting the feed into a titanium part green body at an injection temperature of 176 ℃, an injection pressure of 76MPa, a pressure maintaining pressure of 83MPa, an injection speed of 57mm/S and a cooling time of 12S;
6) introducing molten steel into the titanium part green body at the temperature of 174 ℃, and oscillating, wherein the molten steel is pretreated molten steel, and the pretreatment comprises the following steps:
s1, obtaining a steel billet;
s2, cleaning the billet raw material, removing various impurities on the surface, then heating the billet raw material in a medium-frequency induction heating furnace, introducing protective gas into the medium-frequency induction heating furnace to prevent the billet raw material from being oxidized in heating, heating the billet raw material to about 800 ℃, then stopping heating to keep the temperature of the billet raw material for about 30min, after the temperature is kept, heating the billet again to about 1100 ℃, and adding the following raw materials in parts by weight: the material comprises the following raw materials in parts by weight: cr3.5%, Mo1.5%, Ni3.0%, V0.3%, Cu 3%, Al0.04%, Ca0.03%, B0.007%, Te0.016%, Se0.03%, Pb0.03% and Nb0.03%, to obtain a composite steel blank;
s3, taking out the composite steel blank obtained in the step S2, putting the composite steel blank into oil, cooling to 452 ℃, taking out the composite steel blank, putting the composite steel blank into air, and air-cooling to room temperature;
s4, carrying out two times of continuous same tempering on the composite steel at room temperature, wherein the tempering temperature is 557 ℃; tempering the composite steel after twice tempering again, wherein the tempering temperature is 396 ℃;
and S5, heating and melting the composite steel in the S4 into molten steel for standby. (ii) a
7) Heating the green titanium part at a temperature rise rate of 6 ℃/min, a temperature of 1300 ℃, a time of 75min and a vacuum degree of 1x10-3And Pa, sintering to obtain a titanium part, removing impurities on the surface of the base layer by adopting an abrasive belt or a milling machine, and respectively and sequentially grinding and polishing the sintered titanium part to ensure that the thickness of the treated titanium part is 96% of that of the titanium part before treatment.
Example two:
a preparation method of a titanium steel composite part comprises the following steps:
1) uniformly mixing titanium powder with average particle sizes of 45.74, 35.12 and 23.46 mu m according to the weight ratio of 70:20: 10;
2) the titanium powder in the step one is ground to obtain primary powder, and the grinding is ball milling, vibration or stirring, preferably mechanical ball milling, mechanical vibration or mechanical stirring, more preferably the ball milling frequency is 20Hz, and the ball milling time is 8 hours;
3) placing the primary powder in a vacuum-pumping container filled with inert gas for protection, heating at high temperature for a certain time, wherein the vacuum degree of the vacuum-pumping is 5-102Pa, the pressure of inert gas is 0.04MPa, preferably argon or neon;
4) cooling the primary powder heated in the third step, adding titanium powder into the binder particles at 190 ℃ at intervals of seven minutes, cooling to 175 ℃ after all the powder is added, mixing for 1 hour, and cooling to obtain a feed;
5) injecting the feed into a titanium part green body at an injection temperature of 170 ℃, an injection pressure of 70MPa, a pressure maintaining pressure of 80MPa, an injection speed of 55mm/S and a cooling time of 12S;
6) introducing molten steel into the titanium part green body at the temperature of 160 ℃ and oscillating, wherein the molten steel is pretreated molten steel, and the pretreatment comprises the following steps:
s1, obtaining a steel billet;
s2, cleaning the billet raw material, removing various impurities on the surface, then heating the billet raw material in a medium-frequency induction heating furnace, introducing protective gas into the medium-frequency induction heating furnace to prevent the billet raw material from being oxidized in heating, heating the billet raw material to about 800 ℃, then stopping heating to keep the temperature of the billet raw material for about 30min, after the temperature is kept, heating the billet again to about 1100 ℃, and adding the following raw materials in parts by weight: the material comprises the following raw materials in parts by weight: cr3.5%, Mo1.5%, Ni3.0%, V0.3%, Cu 3%, Al0.04%, Ca0.03%, B0.007%, Te0.016%, Se0.03%, Pb0.03% and Nb0.03%, to obtain a composite steel blank;
s3, taking out the composite steel blank obtained in the step S2, putting the composite steel blank into oil, cooling to 445 ℃, taking out the composite steel blank, putting the composite steel blank into air, and air-cooling to room temperature;
s4, carrying out two times of continuous same tempering on the composite steel at room temperature, wherein the tempering temperature is 555 ℃; tempering the composite steel after twice tempering again, wherein the tempering temperature is 395 ℃;
and S5, heating and melting the composite steel in the S4 into molten steel for standby. (ii) a
7) Heating the green titanium part at a temperature rise rate of 6 ℃/min, a temperature of 1300 ℃, a time of 75min and a vacuum degree of 1x10-3And Pa, sintering to obtain a titanium part, removing impurities on the surface of the base layer by adopting an abrasive belt or a milling machine, and respectively and sequentially grinding and polishing the sintered titanium part to ensure that the thickness of the treated titanium part is 92% of that of the titanium part before treatment.
Example three:
a preparation method of a titanium steel composite part comprises the following steps:
1) uniformly mixing titanium powder with average particle sizes of 45.74, 35.12 and 23.46 mu m according to the weight ratio of 70:20: 10;
2) the titanium powder in the step one is ground to obtain primary powder, and the grinding is ball milling, vibration or stirring, preferably mechanical ball milling, mechanical vibration or mechanical stirring, more preferably the ball milling frequency is 40Hz, and the ball milling time is 10 hours;
3) placing the primary powder in a vacuum-pumping container filled with inert gas for protection, heating at high temperature for a certain time, wherein the vacuum degree of the vacuum-pumping is 5-102Pa, the pressure of inert gas is 0.09MPa, and argon or neon is preferred;
4) cooling the primary powder heated in the third step, adding titanium powder into the binder particles at 195 ℃ at intervals of seven minutes, cooling to 180 ℃ after all the powder is added, mixing for 1 hour, and cooling to obtain a feed;
5) injecting the feed into a titanium part green body at the injection temperature of 180 ℃, the injection pressure of 80MPa, the pressure maintaining pressure of 85MPa, the injection speed of 65mm/S and the cooling time of 12S;
6) introducing molten steel into the titanium part green body at the temperature of 180 ℃ and oscillating, wherein the molten steel is pretreated molten steel, and the pretreatment comprises the following steps:
s1, obtaining a steel billet;
s2, cleaning the billet raw material, removing various impurities on the surface, then heating the billet raw material in a medium-frequency induction heating furnace, introducing protective gas into the medium-frequency induction heating furnace to prevent the billet raw material from being oxidized in heating, heating the billet raw material to about 800 ℃, then stopping heating to keep the temperature of the billet raw material for about 30min, after the temperature is kept, heating the billet again to about 1100 ℃, and adding the following raw materials in parts by weight: the material comprises the following raw materials in parts by weight: cr3.5%, Mo1.5%, Ni3.0%, V0.3%, Cu 3%, Al0.04%, Ca0.03%, B0.007%, Te0.016%, Se0.03%, Pb0.03% and Nb0.03%, to obtain a composite steel blank;
s3, taking out the composite steel blank obtained in the step S2, putting the composite steel blank into oil, cooling the composite steel blank to 455 ℃, taking out the composite steel blank, putting the composite steel blank into air, and air-cooling the composite steel blank to room temperature;
s4, continuously tempering the composite steel at room temperature twice at the same temperature, wherein the tempering temperature is 565 ℃; tempering the composite steel after twice tempering at 405 ℃;
and S5, heating and melting the composite steel in the S4 into molten steel for standby. (ii) a
7) Heating the green titanium part at the temperature rise rate of 6 ℃/min, the temperature of 1400 ℃, the time of 75min and the vacuum degree of 1x10-3Pa, sintering to obtain a titanium part, removing impurities on the surface of the base layer by adopting an abrasive belt or a milling machine to obtain the titanium part, and respectively grinding and polishing the titanium part obtained by sintering to ensure that the thickness of the treated titanium part is equal to that of the titanium part98% of the thickness of the titanium part before treatment.
The invention has the beneficial effects that: according to the preparation method of the titanium steel composite part, the titanium powder with various particle sizes is adopted for optimized proportioning and fully and uniformly mixed, and then high-vacuum sintering is carried out to obtain the titanium steel part with high dimensional accuracy, uniform tissue structure and high performance, so that the titanium steel part has excellent stress resistance and static tension performance, and the defects of poor wear resistance and high-temperature performance of the original titanium alloy and the like are overcome.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The preparation method of the titanium steel composite part is characterized by comprising the following steps:
1) uniformly mixing titanium powder with average particle sizes of 45.74, 35.12 and 23.46 mu m according to the weight ratio of 70:20: 10;
2) grinding the titanium powder in the step one to obtain primary powder;
3) placing the preliminary powder in a vacuum-pumping container filled with inert gas for protection, and heating for a certain time at a high temperature;
4) cooling the preliminary powder heated in the third step, adding titanium powder into the binder particles at 190-195 ℃ at intervals of seven minutes, cooling to 175-180 ℃ after all the powder is added, mixing for 1 hour, and cooling to obtain a feed material;
5) injecting the feed into a titanium part green body at an injection temperature of 170-180 ℃, an injection pressure of 70-80 MPa, a pressure maintaining pressure of 80-85 MPa, an injection speed of 55-65 mm/S and a cooling time of 12S;
6) introducing molten steel into the titanium part green body at the temperature of 160-180 ℃, and oscillating;
7) heating the titanium part green body at a heating rate of 6 ℃/min, a temperature of 1300-1400 ℃, a time of 75min and a vacuum degree of 1x10-3And Pa, sintering to obtain the titanium part.
2. The method for preparing a titanium steel composite part according to claim 1, wherein the degree of vacuum of the vacuum pumping in the third step is 5 to 102Pa, the pressure of the inert gas is 0.04-0.09MPa, and argon or neon is preferred.
3. The method for preparing a titanium steel composite part according to claim 1, wherein the grinding in the second step is ball milling, vibration or stirring, preferably mechanical ball milling, mechanical vibration or mechanical stirring, more preferably the ball milling frequency is 15-40Hz, and the ball milling time is 4-10 hours.
4. The method for preparing the titanium steel composite part according to claim 1, wherein the molten steel in the sixth step is pretreated molten steel, and the pretreatment comprises the following steps:
s1, obtaining a steel billet;
s2, cleaning the billet raw material, removing various impurities on the surface, then heating the billet raw material in a medium-frequency induction heating furnace, introducing protective gas into the medium-frequency induction heating furnace to prevent the billet raw material from being oxidized in heating, heating the billet raw material to about 800 ℃, then stopping heating to keep the temperature of the billet raw material for about 30min, after the temperature is kept, heating the billet again to about 1100 ℃, and adding the following raw materials in parts by weight: cr trace to 4.5%, Mo trace to 2.0%, Ni trace to 4.5%, V trace to 0.5%, Cu trace to 4%, Al trace to 0.060%, Ca trace to 0.050%, B trace to 0.01%, Te trace to 0.020%, Se trace to 0.040%, Pb trace to 0.070%, and Nb trace to 0.050%, to obtain a composite steel blank;
s3, taking out the composite steel blank obtained in the step S2, putting the composite steel blank into oil, cooling to 445-455 ℃, taking out the composite steel blank, putting the composite steel blank into air, and air-cooling to room temperature;
s4, continuously tempering the composite steel at room temperature twice at the same temperature of 555-565 ℃; tempering the composite steel after twice tempering again, wherein the tempering temperature is 395-405 ℃;
and S5, heating and melting the composite steel in the S4 into molten steel for standby.
5. The preparation method of the titanium steel composite part according to claim 4, characterized by comprising the following raw materials in parts by weight: 3.5% of Cr, 1.5% of Mo, 3.0% of Ni, 0.3% of V, 3% of Cu, 0.04% of Al, 0.03% of Ca, 0.007% of B, 0.016% of Te, 0.03% of Se, 0.03% of Pb and 0.03% of Nb.
6. The preparation method of the titanium steel composite part according to claim 4, characterized by comprising the following raw materials in parts by weight: 2.8% of Cr, 1.6% of Mo, 3.6% of Ni, 0.4% of V, 3% of Cu, 0.03% of Al, 0.04% of Ca, 0.004% of B, 0.015% of Te, 0.03% of Se, 0.04% of Pb and 0.04% of Nb.
7. The method for preparing the titanium steel composite part according to claim 1, wherein in the step 7, the titanium part obtained by sintering is subjected to impurity removal on the surface of the base layer by using a sanding belt or a milling machine.
8. The method for manufacturing a titanium-steel composite part according to claim 1, wherein in the step 7, the titanium part obtained by sintering is subjected to grinding and polishing treatment in sequence respectively so that the thickness of the treated titanium part is 92-98% of the thickness of the titanium part before treatment.
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| CN115533102A (en) * | 2022-09-28 | 2022-12-30 | 歌尔股份有限公司 | Titanium steel composite material part and preparation method thereof |
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