CN106319236A - Preparation method of Ti2AlNb alloy material - Google Patents
Preparation method of Ti2AlNb alloy material Download PDFInfo
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- CN106319236A CN106319236A CN201610936536.3A CN201610936536A CN106319236A CN 106319236 A CN106319236 A CN 106319236A CN 201610936536 A CN201610936536 A CN 201610936536A CN 106319236 A CN106319236 A CN 106319236A
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- 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
- C22B9/20—Arc remelting
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- 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
- C22C1/03—Making non-ferrous alloys by melting using master alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/16—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of other metals or alloys based thereon
- C22F1/18—High-melting or refractory metals or alloys based thereon
- C22F1/183—High-melting or refractory metals or alloys based thereon of titanium or alloys based thereon
Abstract
The invention discloses a preparation method of a Ti2AlNb alloy material. The method comprises the steps of 1, preparing a Ti2AlNb alloy ingot through vacuum self-consumption electric arc melting, kish furnace smelting and vacuum self-consumption electric arc melting; 2, conducting primary homogenization treatment on the Ti2AlNb alloy ingot; and 3, wrapping the Ti2AlNb alloy ingot with asbestos cloth, then conducting heat-preservation heat treatment, and then sequentially conducting cogging forging, improved forging and finished product forging, so that the Ti2AlNb alloy material is finally obtained. The preparation method of the Ti2AlNb alloy material is simple in preparation process and reasonable in process design; an alloy is uniform in structure and stable in performance; the alloy ingot can be effectively refined, purified and homogenized through a smelting method; through the high-quality ingot, smooth implementation of subsequent hot working is guaranteed; by means of homogenization treatment, uniformity of alloy elements can be further improved through element diffusion; and wrapping treatment is conducted with the asbestos cloth, the temperature of the material can be effectively prevented from being lowered in the whole forging process, and large-deformation-amount forging for one heating time is achieved.
Description
Technical field
The invention belongs to titanium alloy preparing technical field, be specifically related to the preparation method of a kind of Ti2AlNb alloy material.
Background technology
The hard-core technology such as Aero-Space, national defense industry field is more and more higher to the performance requirement of material, especially Aero-Space
Load-carrying construction and engine material, the further loss of weight of an urgent demand and raising high-temperature service performance.Titanium alloy is with the thing of its excellence
Reason with mechanical property and become one of preferred material.But, the conventional titanium alloy with solid solution as base, due to stable by alloy
Property and the restriction of antioxygenic property, maximum operation (service) temperature and oxidation resistance temperature can only achieve 600 DEG C, and this temperature becomes
The upper limit of such alloy material thermostability, far from the use requirement meeting some hot-end component of electromotor.Comparatively speaking,
Ti2AlNb alloy (nominal composition is Ti-22Al-25Nb) has low-density, high specific strength, good non-oxidizability and nonmagnetic
Etc. advantage, becoming can be at one of 650 DEG C～800 DEG C most potential lightweight high-temperature structural material used.But for tradition
The titanium alloy with solid solution strengthening as principal mode, Ti2AlNb alloy be with intermediate compound strengthen, Ti2AlNb alloy
The hybrid bonded mode of metallic bond and covalent bond makes it while having the high-temperature behavior of excellence, there is also intrinsic crisp
Property, bring extreme difficulties for its processing.The most effectively control the cracking behaviors in Ti2AlNb alloy hot procedure, warp
Ji, it is efficiently completed the subject matter that the preparation always Ti2AlNb of alloy faces.Meanwhile, containing a large amount of in Ti2AlNb alloy
Nb element, itself and Ti, Al element either density or fusing point difference are huge, how to prepare high-quality pure, uniform
Ingot casting is also major issue prepared by Ti2AlNb alloy.
Summary of the invention
The technical problem to be solved is for above-mentioned the deficiencies in the prior art, it is provided that a kind of Ti2AlNb closes
The preparation method of gold copper-base alloy.This preparation method solves the homogenization of composition during Ti2AlNb alloy melting and impurities removal,
Prepare pure, homogenizing and alloy cast ingot.Meanwhile, the hot-working method of the application present invention, alloy hot-working can be prevented effectively from
During problem of Cracking, improve the deflection of Dan Huoci, not only make to forge efficiency and improve, and be more beneficial for optimized alloy
Tissue, prepares high-quality Ti2AlNb material.
For solving above-mentioned technical problem, the technical solution used in the present invention is: the preparation side of a kind of Ti2AlNb alloy material
Method, it is characterised in that the method comprises the following steps:
Step one, preparation Ti2AlNb alloy cast ingot, detailed process is:
Step 101, Ti-Nb intermediate alloy, aluminium shot and zero level titanium sponge are mixed, and be pressed into electrode, then use true
Empty consumable electroarc furnace melting, obtains an ingot casting；
Step 102, being placed on skull crucible by described in step 101 ingot casting and carry out melting, melting is poured into after completing
In graphite mould mould, obtain secondary ingot casting；
Step 103, by after surface turning 2mm～4mm of secondary ingot casting described in step 102, use vacuum arc furnace ignition to carry out
Melting, obtains Ti2AlNb alloy cast ingot；
Step 2, Ti2AlNb alloy cast ingot described in step 103 is carried out surface strip off the skin and cut rising head process, then put
Isothermal holding A min in the heat-treatment furnace that temperature is 750 DEG C～800 DEG C, then the temperature of heat-treatment furnace is risen to 1050 DEG C～
1150 DEG C, from heat-treatment furnace, after insulation 8h～10h, take out air cooling；
The time A of described isothermal holding meets: (D/4-10) min≤A≤(D/4+10) min, during wherein D is step 103
The diameter of described Ti2AlNb alloy cast ingot, the unit of D is millimeter；
Ti2AlNb alloy cast ingot after step 2 hollow cold is wrapped up by step 3, employing asbestos cloth, then will parcel
The Ti2AlNb alloy cast ingot of asbestos cloth is placed in isothermal holding B min in the heat-treatment furnace that temperature is 750 DEG C～800 DEG C, then by heat
The temperature processing stove rises to taking-up feeding quick forging machine forging after the temperature that cogging is forged, and the detailed process of forging is: first in temperature
Carry out cogging forging under conditions of being 1170 DEG C～1200 DEG C, then change under conditions of temperature is 1050 DEG C～1100 DEG C
Forging, finally carries out finished product forging under conditions of temperature is 970 DEG C～1020 DEG C, finally gives Ti2AlNb alloy material；Described
Cogging forging is divided into 1 fire time to complete, described in change forging and be divided into 2～4 fire and complete, the forging of described finished product is divided into 1 fire to complete, institute
The deflection of the every fire time state cogging forging, changing forging and finished product forging is 120%～160%；
The time B of described isothermal holding meets: (D/4-10) min≤B≤(D/4+10) min, during wherein D is step 103
The diameter of described Ti2AlNb alloy cast ingot, the unit of D is millimeter.
The preparation method of above-mentioned a kind of Ti2AlNb alloy material, it is characterised in that change in forging process described in step 3
The forging temperature that changes of every fire time is gradually lowered.
The preparation method of above-mentioned a kind of Ti2AlNb alloy material, it is characterised in that asbestos cloth described in step 3 and
Ti2AlNb alloy cast ingot connects by iron wire is fixing.
The preparation method of above-mentioned a kind of Ti2AlNb alloy material, it is characterised in that the forging of cogging described in step 3,
Change every fire of forging and finished product forging all to carry out 2 upsettings 2 and pull out process.
The preparation method of above-mentioned a kind of Ti2AlNb alloy material, it is characterised in that forge in described cogging in step 3
Front the hammering block of quick forging machine is preheated to 250 DEG C～300 DEG C.
The preparation method of above-mentioned a kind of Ti2AlNb alloy material, it is characterised in that the thickness of asbestos cloth described in step 3
Degree is 10mm～20mm.
The present invention compared with prior art has the advantage that
1, containing a large amount of high density, high-melting point alloy element Nb in Ti2AlNb alloy of the present invention, use traditional vacuum certainly
The melting electric current of consumption electric arc melting is little, molten bath is little, even if repeatedly melting, its intrinsic limitation determines that it can not thoroughly remove not
Being mingled with of melt, and ensure the homogeneity of ingredients of Ti2AlNb alloy cast ingot.And the present invention uses twice vacuum consumable electric arc melt
An interspersed skull melting in the middle of refining, owing to skull melting electric current is big, can be with high-melting-point all of in effective guarantee electrode
Material is completely melt, it is to avoid being mingled with of niggerhead.Meanwhile, during skull melting, electrode melting completes to pour into graphite jig
Before, in crucible, metal is completely in liquid in addition to cold shell, can play the effect of cold hearth, for ensureing the high chemistry of ingot casting all
Even property has remarkable result.Pour into a mould finally by graphite jig, further function as the effect of homogenization of composition.Cause
This, use the method for smelting of the present invention to prepare Ti2AlNb alloy cast ingot, and its refine, purification and uniformization effect are much better than routine
Vacuum consumable electrode arc furnace, the ingot casting of high-quality also for subsequent thermal processing be smoothed out provide guarantee.
2, the present invention is before forging, carries out a high temperature alloy Homogenization Treatments, by high-temperature heating, allows Nb element enter one
Step diffusion, improves the homogeneity of ingredients of ingot casting, and the ingot casting of uniformity is the guarantee processed smoothly in the later stage.
3, the present invention is before all of fire time Forge Heating, uses asbestos cloth to process blank parcel, in forging process,
Forge together with asbestos cloth, since the most sensitive to temperature in Ti2AlNb alloy hot procedure, the most widely used to forging
Make hammering block preheating, and the method for place mat asbestos cloth.Although the method to a certain degree can avoid material surface to lower the temperature, reduce material
Cracking behaviors in the course of processing.But general method cannot ensure that material is from heating furnace to forging hammering block traveling process
Surface cooling problem, lays asbestos cloth on hammering block simultaneously, and in forging process, blank most surfaces is exposed in air, it is impossible to
Effectively insulation.In forging process, asbestos cloth constantly to correct simultaneously, wastes time.Production practices show, use general forging
Method, alloy one fire is only capable of realizing upsetting pull forging, and deformation quantity is less than 70%, while waste resource, it is impossible to effectively
The refinement to tissue and optimization is realized by Dan Huoci large deformation.Use the heats forged method of the present invention, from heating furnace to forging
Make whole during blank all in effectively protection among, and when forging, under the effect of compressive stress, asbestos cloth can stick in
Material surface, had both been effectively prevented coming off of asbestos cloth, moreover it is possible to play certain lubrication, it is to avoid the surface of material is opened
Split.It was verified that employing the inventive method, material one fire time is minimum can be realized secondary upsetting pull and process, and deflection can be
120%～160%, and forge rear surface quality preferably, tearing tendency is little.
4, preparation technology of the present invention is simple, and technological design is reasonable, and prepared Ti2AlNb alloy structure is uniform, and performance is steady
Fixed, and under 25 DEG C of room temperature test conditions, tensile strength Rm is not less than 1040MPa, 0.2% nonproportional cyclic straining Rp0.2
Not less than 845MPa, elongation percentage A not less than 9.5%, contraction percentage of area Z is not less than 18%；Under 600 DEG C of test conditions, tension
Intensity Rm is not less than 720MPa, and 0.2% nonproportional cyclic straining is not less than 640MPa, elongation percentage A not less than 17.5%, and section is received
Shrinkage Z is not less than 42%；Under 650 DEG C of test conditions, tensile strength Rm is not less than 765MPa, 0.2% nonproportional cyclic straining
Not less than 655MPa, elongation percentage A not less than 18.5%, contraction percentage of area Z is not less than 50%；It follows that prepared by the present invention
Ti2AlNb alloy material has good mechanical property under the room temperature of 25 DEG C, the most also has good at 600 DEG C and 650 DEG C
Mechanical property, the application requirement under the high temperature conditions of Ti2AlNb alloy material can be met.
Below by drawings and Examples, technical scheme is described in further detail.
Accompanying drawing explanation
Fig. 1 is that the Ti2AlNb alloy bar material of the embodiment of the present invention 1 preparation is at 960 DEG C/3h FC+760 DEG C/24h AC warm
Micro-organization chart after reason.
Detailed description of the invention
Embodiment 1
The present embodiment is prepared the method for Ti2AlNb alloy bar material and is comprised the following steps:
Step one, preparation Ti2AlNb alloy cast ingot, detailed process is:
Step 101, Ti-Nb intermediate alloy, aluminium shot and zero level titanium sponge are mixed, and be pressed into electrode, then use true
Empty consumable electroarc furnace melting, obtains an ingot casting of Φ 160mm；
Step 102, being placed on skull crucible by described in step 101 ingot casting and carry out melting, melting is poured into after completing
In graphite mould mould, obtain the secondary ingot casting of Φ 160mm；
Step 103, by after the surface turning 3mm of secondary ingot casting described in step 102, use vacuum arc furnace ignition to carry out melting,
Obtain the Ti2AlNb alloy cast ingot of Φ 220mm；
Step 2, Ti2AlNb alloy cast ingot described in step 103 is carried out surface strip off the skin and cut rising head process, then put
Isothermal holding 55min in the heat-treatment furnace that temperature is 750 DEG C, then the temperature of heat-treatment furnace is risen to 1050 DEG C, after insulation 8h
Air cooling is taken out from heat-treatment furnace；
Ti2AlNb alloy cast ingot after step 2 hollow cold is wrapped by step 3, the asbestos cloth using thickness to be 10mm
Wrap up in, and fixed by iron wire, then the Ti2AlNb alloy cast ingot of parcel asbestos cloth is placed in the heat-treatment furnace that temperature is 750 DEG C
Middle isothermal holding 55min, then the temperature of heat-treatment furnace is risen to taking-up feeding quick forging machine forging after the temperature of cogging forging, forging
Detailed process be: under conditions of temperature is 1170 DEG C, first carry out the cogging forging of 1 fire time, the change of the cogging forging of 1 fire time
Shape amount is 140%, then carry out under conditions of temperature is 1050 DEG C and 1050 DEG C 2 fire time change forging, 2 fire time the deformation changing forging
Amount is respectively 160% and 130%, finally carries out the finished product forging of 1 fire time, the finished product of 1 fire time under conditions of temperature is 970 DEG C
The deflection of forging is 140%, finally gives Ti2AlNb alloy bar material.
In the present embodiment, described cogging forging, change every fire of forging and finished product forging and the most all carry out 2 upsettings 2 and pull out process；Described
Before cogging forging, the hammering block of quick forging machine is preheated to 250 DEG C.
Fig. 1 is that the Ti2AlNb alloy bar material prepared of the present embodiment is after 960 DEG C/3h FC+760 DEG C/24h AC heat treatment
Micro-organization chart, it will be seen from figure 1 that the alloy structure of this Ti2AlNb alloy bar material is the most tiny.
Embodiment 2
The present embodiment is prepared the method for Ti2AlNb alloy bar material and is comprised the following steps:
Step one, preparation Ti2AlNb alloy cast ingot, detailed process is:
Step 101, Ti-Nb intermediate alloy, aluminium shot and zero level titanium sponge are mixed, and be pressed into electrode, then use true
Empty consumable electroarc furnace melting, obtains an ingot casting of Φ 160mm；
Step 102, being placed on skull crucible by described in step 101 ingot casting and carry out melting, melting is poured into after completing
In graphite mould mould, obtain the secondary ingot casting of Φ 160mm；
Step 103, by after the surface turning 4mm of secondary ingot casting described in step 102, use vacuum arc furnace ignition to carry out melting,
Obtain the Ti2AlNb alloy cast ingot of Φ 220mm；
Step 2, Ti2AlNb alloy cast ingot described in step 103 is carried out surface strip off the skin and cut rising head process, then put
Isothermal holding 45min in the heat-treatment furnace that temperature is 780 DEG C, then the temperature of heat-treatment furnace is risen to 1080 DEG C, after insulation 8h
Air cooling is taken out from heat-treatment furnace；
Ti2AlNb alloy cast ingot after step 2 hollow cold is wrapped by step 3, the asbestos cloth using thickness to be 15mm
Wrap up in, and fixed by iron wire, then the Ti2AlNb alloy cast ingot of parcel asbestos cloth is placed in the heat-treatment furnace that temperature is 780 DEG C
Middle isothermal holding 45min, then the temperature of heat-treatment furnace is risen to taking-up feeding quick forging machine forging after the temperature of cogging forging, forging
Detailed process be: under conditions of temperature is 1190 DEG C, first carry out the cogging forging of 1 fire time, the change of the cogging forging of 1 fire time
Shape amount is 150%, then carry out under conditions of temperature is followed successively by 1100 DEG C, 1080 DEG C and 1050 DEG C 3 fire time change forging, 3 fire time
The deflection changing forging be respectively 160%, 150% and 130%, finally carry out under conditions of temperature is 1000 DEG C 1 fire time
Finished product forges, and the forging of described finished product has been divided into, and the deflection of 1 fire time of described finished product forging is 140%, finally gives
Ti2AlNb alloy bar material.
In the present embodiment, described cogging forging, change every fire of forging and finished product forging and the most all carry out 2 upsettings 2 and pull out process；Described
Before cogging forging, the hammering block of quick forging machine is preheated to 280 DEG C.
Ti2AlNb alloy bar material prepared by the present embodiment is after 960 DEG C/3h FC+760 DEG C/24h AC heat treatment, and it closes
Payment organization is the most tiny.
Embodiment 3
The present embodiment is prepared the method for Ti2AlNb alloy bar material and is comprised the following steps:
Step one, preparation Ti2AlNb alloy cast ingot, detailed process is:
Step 101, Ti-Nb intermediate alloy, aluminium shot and zero level titanium sponge are mixed, and be pressed into electrode, then use true
Empty consumable electroarc furnace melting, obtains an ingot casting of Φ 160mm；
Step 102, being placed on skull crucible by described in step 101 ingot casting and carry out melting, melting is poured into after completing
In graphite mould mould, obtain the secondary ingot casting of Φ 160mm；
Step 103, by after the surface turning 4mm of secondary ingot casting described in step 102, use vacuum arc furnace ignition to carry out melting,
Obtain the Ti2AlNb alloy cast ingot of Φ 220mm；
Step 2, Ti2AlNb alloy cast ingot described in step 103 is carried out surface strip off the skin and cut rising head process, then put
Isothermal holding 65min in the heat-treatment furnace that temperature is 780 DEG C, then the temperature of heat-treatment furnace is risen to 1120 DEG C, after insulation 9h
Air cooling is taken out from heat-treatment furnace；
Ti2AlNb alloy cast ingot after step 2 hollow cold is wrapped by step 3, the asbestos cloth using thickness to be 10mm
Wrap up in, and fixed by iron wire, then the Ti2AlNb alloy cast ingot of parcel asbestos cloth is placed in the heat-treatment furnace that temperature is 800 DEG C
Middle isothermal holding 65min, then the temperature of heat-treatment furnace is risen to taking-up feeding quick forging machine forging after the temperature of cogging forging, forging
Detailed process be: under conditions of temperature is 1185 DEG C, first carry out the cogging forging of 1 fire time, the change of the cogging forging of 1 fire time
Shape amount is 160%, then under conditions of temperature is followed successively by 1100 DEG C and 1050 DEG C, carry out 2 fire time change forging, 2 fire time change forging
Deflection is respectively 150% and 140%, finally carries out the finished product forging of 1 fire time, described one-tenth under conditions of temperature is 1000 DEG C
Product forging has been divided into, and the deflection of 1 fire time of described finished product forging is 150%, finally gives Ti2AlNb alloy bar material.
In the present embodiment, described cogging forging, change every fire of forging and finished product forging and the most all carry out 2 upsettings 2 and pull out process；Described
Before cogging forging, the hammering block of quick forging machine is preheated to 270 DEG C.
Ti2AlNb alloy bar material prepared by the present embodiment is after 960 DEG C/3h FC+760 DEG C/24h AC heat treatment, and it closes
Payment organization is the most tiny.
Embodiment 4
The present embodiment is prepared the method for Ti2AlNb alloy square billet and is comprised the following steps:
Step one, preparation Ti2AlNb alloy cast ingot, detailed process is:
Step 101, Ti-Nb intermediate alloy, aluminium shot and zero level titanium sponge are mixed, and be pressed into electrode, then use true
Empty consumable electroarc furnace melting, obtains an ingot casting of Φ 220mm；
Step 102, being placed on skull crucible by described in step 101 ingot casting and carry out melting, melting is poured into after completing
In graphite mould mould, obtain the secondary ingot casting of Φ 220mm；
Step 103, by after the surface turning 4mm of secondary ingot casting described in step 102, use vacuum arc furnace ignition to carry out melting,
Obtain the Ti2AlNb alloy cast ingot of Φ 280mm；
Step 2, Ti2AlNb alloy cast ingot described in step 103 is carried out surface strip off the skin and cut rising head process, then put
Isothermal holding 70min in the heat-treatment furnace that temperature is 800 DEG C, then the temperature of heat-treatment furnace is risen to 1150 DEG C, after insulation 10h
Air cooling is taken out from heat-treatment furnace；
Ti2AlNb alloy cast ingot after step 2 hollow cold is wrapped by step 3, the asbestos cloth using thickness to be 20mm
Wrap up in, and fixed by iron wire, then the Ti2AlNb alloy cast ingot of parcel asbestos cloth is placed in the heat-treatment furnace that temperature is 800 DEG C
Middle isothermal holding 70min, then the temperature of heat-treatment furnace is risen to taking-up feeding quick forging machine forging after the temperature of cogging forging, forging
Detailed process be: under conditions of temperature is 1200 DEG C, first carry out the cogging forging of 1 fire time, the change of the cogging forging of 1 fire time
Shape amount is 160%, then carries out changing of 4 fire time under conditions of temperature is followed successively by 1100 DEG C, 1100 DEG C, 1070 DEG C and 1050 DEG C
Forging, the deflection changing forging of 4 fire time is respectively 160%, 150%, 150% and 140%, finally in the condition that temperature is 1020 DEG C
Under carry out 1 fire time finished product forging, described finished product forging be divided into, described finished product forging 1 fire time deflection be
120%, finally give Ti2AlNb alloy square billet.
In the present embodiment, described cogging forging, change every fire of forging and finished product forging and the most all carry out 2 upsettings 2 and pull out process；Described
Before cogging forging, the hammering block of quick forging machine is preheated to 300 DEG C.
Ti2AlNb alloy square billet prepared by the present embodiment is after 960 DEG C/3h FC+760 DEG C/24h AC heat treatment, and it closes
Payment organization is the most tiny.
Embodiment 5
The present embodiment is prepared the method for Ti2AlNb alloy square billet and is comprised the following steps:
Step one, preparation Ti2AlNb alloy cast ingot, detailed process is:
Step 101, Ti-Nb intermediate alloy, aluminium shot and zero level titanium sponge are mixed, and be pressed into electrode, then use true
Empty consumable electroarc furnace melting, obtains an ingot casting of Φ 220mm；
Step 102, being placed on skull crucible by described in step 101 ingot casting and carry out melting, melting is poured into after completing
In graphite mould mould, obtain the secondary ingot casting of Φ 220mm；
Step 103, by after the surface turning 3mm of secondary ingot casting described in step 102, use vacuum arc furnace ignition to carry out melting,
Obtain the Ti2AlNb alloy cast ingot of Φ 280mm；
Step 2, Ti2AlNb alloy cast ingot described in step 103 is carried out surface strip off the skin and cut rising head process, then put
Isothermal holding 60min in the heat-treatment furnace that temperature is 750 DEG C, then the temperature of heat-treatment furnace is risen to 1100 DEG C, after insulation 9h
Air cooling is taken out from heat-treatment furnace；
Ti2AlNb alloy cast ingot after step 2 hollow cold is wrapped by step 3, the asbestos cloth using thickness to be 15mm
Wrap up in, and fixed by iron wire, then the Ti2AlNb alloy cast ingot of parcel asbestos cloth is placed in the heat-treatment furnace that temperature is 750 DEG C
Middle isothermal holding 60min, then the temperature of heat-treatment furnace is risen to taking-up feeding quick forging machine forging after the temperature of cogging forging, forging
Detailed process be: under conditions of temperature is 1170 DEG C, first carry out the cogging forging of 1 fire time, the change of the cogging forging of 1 fire time
Shape amount is 140%, then carry out under conditions of temperature is followed successively by 1100 DEG C, 1070 DEG C and 1050 DEG C 3 fire time change forging, 3 fire time
The deflection changing forging be respectively 160%, 145% and 130%, finally carry out under conditions of temperature is 980 DEG C 1 fire time one-tenth
Product forge, and the forging of described finished product has been divided into, and the deflection of 1 fire time of described finished product forging is 130%, finally gives
Ti2AlNb alloy square billet.
In the present embodiment, described cogging forging, change every fire of forging and finished product forging and the most all carry out 2 upsettings 2 and pull out process；Described
Before cogging forging, the hammering block of quick forging machine is preheated to 250 DEG C.
Ti2AlNb alloy square billet prepared by the present embodiment is after 960 DEG C/3h FC+760 DEG C/24h AC heat treatment, and it closes
Payment organization is the most tiny.
Embodiment 6
The present embodiment is prepared the method for Ti2AlNb alloy square billet and is comprised the following steps:
Step one, preparation Ti2AlNb alloy cast ingot, detailed process is:
Step 101, Ti-Nb intermediate alloy, aluminium shot and zero level titanium sponge are mixed, and be pressed into electrode, then use true
Empty consumable electroarc furnace melting, obtains an ingot casting of Φ 220mm；
Step 102, being placed on skull crucible by described in step 101 ingot casting and carry out melting, melting is poured into after completing
In graphite mould mould, obtain the secondary ingot casting of Φ 220mm；
Step 103, by after the surface turning 4mm of secondary ingot casting described in step 102, use vacuum arc furnace ignition to carry out melting,
Obtain the Ti2AlNb alloy cast ingot of Φ 280mm；
Step 2, Ti2AlNb alloy cast ingot described in step 103 is carried out surface strip off the skin and cut rising head process, then put
Isothermal holding 80min in the heat-treatment furnace that temperature is 750 DEG C, then the temperature of heat-treatment furnace is risen to 1150 DEG C, after insulation 10h
Air cooling is taken out from heat-treatment furnace；
Ti2AlNb alloy cast ingot after step 2 hollow cold is wrapped by step 3, the asbestos cloth using thickness to be 20mm
Wrap up in, and fixed by iron wire, then the Ti2AlNb alloy cast ingot of parcel asbestos cloth is placed in the heat-treatment furnace that temperature is 800 DEG C
Middle isothermal holding 80min, then the temperature of heat-treatment furnace is risen to taking-up feeding quick forging machine forging after the temperature of cogging forging, forging
Detailed process be: under conditions of temperature is 1200 DEG C, first carry out the cogging forging of 1 fire time, the change of the cogging forging of 1 fire time
Shape amount is 120%, then carries out changing of 4 fire time under conditions of temperature is followed successively by 1100 DEG C, 1080 DEG C, 1060 DEG C and 1050 DEG C
Forging, the deflection changing forging of 4 fire time is respectively 150%, 140%, 130% and 120%, finally in the condition that temperature is 1020 DEG C
Under carry out 1 fire time finished product forging, described finished product forging be divided into, described finished product forging 1 fire time deflection be
160%, finally give Ti2AlNb alloy square billet；Described cogging forging, the every fire changing forging and finished product forging the most all carry out 2 upsettings 2
Pull out process；Before described cogging forging, the hammering block of quick forging machine is preheated to 300 DEG C.
Ti2AlNb alloy square billet prepared by the present embodiment is after 960 DEG C/3h FC+760 DEG C/24h AC heat treatment, and it closes
Payment organization is the most tiny.
The Ti2AlNb alloy bar material of the embodiment of the present invention 1～3 preparation and the Ti2AlNb of the embodiment of the present invention 4～6 preparation
Alloy square billet after 960 DEG C/3h FC+760 DEG C/24h AC heat treatment, difference test at a temperature of (25 DEG C, 600 DEG C and 650
DEG C) the mechanical property tests data recorded, as shown in table 1.
Prepared by the Ti2AlNb alloy bar material of table 1 embodiment of the present invention 1～3 preparation and the embodiment of the present invention 4～6
Ti2AlNb alloy square billet mechanical property tests data at a temperature of difference is tested
The Ti2AlNb alloy bar material of the embodiment of the present invention 1～3 preparation and the Ti2AlNb of the embodiment of the present invention 4～6 preparation
Alloy square billet is under 25 DEG C of room temperature test conditions, and tensile strength Rm is not less than 1040MPa, 0.2% nonproportional cyclic straining Rp0.2
Not less than 845MPa, elongation percentage A not less than 9.5%, contraction percentage of area Z is not less than 18%；Under 600 DEG C of test conditions, tension
Intensity Rm is not less than 720MPa, and 0.2% nonproportional cyclic straining is not less than 640MPa, elongation percentage A not less than 17.5%, and section is received
Shrinkage Z is not less than 42%；Under 650 DEG C of test conditions, tensile strength Rm is not less than 765MPa, 0.2% nonproportional cyclic straining
Not less than 655MPa, elongation percentage A not less than 18.5%, contraction percentage of area Z is not less than 50%；It follows that prepared by the present invention
Ti2AlNb alloy bar material or square billet have good mechanical property under 25 DEG C of room temperatures, the most also have at 600 DEG C and 650 DEG C
Good mechanical property, can meet the application requirement under the high temperature conditions of Ti2AlNb alloy material.
The above, be only presently preferred embodiments of the present invention, not impose any restrictions the present invention.Every according to invention skill
Any simple modification, change and the equivalence change that above example is made by art essence, all still falls within technical solution of the present invention
Protection domain in.
Claims (6)
1. the preparation method of a Ti2AlNb alloy material, it is characterised in that the method comprises the following steps:
Step one, preparation Ti2AlNb alloy cast ingot, detailed process is:
Step 101, Ti-Nb intermediate alloy, aluminium shot and zero level titanium sponge are mixed, and are pressed into electrode, then use vacuum from
Consumption arc melting, obtains an ingot casting；
Step 102, being placed on skull crucible by described in step 101 ingot casting and carry out melting, melting is poured into graphite after completing
In mould, obtain secondary ingot casting；
Step 103, by after surface turning 2mm～4mm of secondary ingot casting described in step 102, use vacuum arc furnace ignition to carry out melting,
Obtain Ti2AlNb alloy cast ingot；
Step 2, Ti2AlNb alloy cast ingot described in step 103 is carried out surface strip off the skin and cut rising head process, be subsequently placed in temperature
Degree is isothermal holding A min in the heat-treatment furnace of 750 DEG C～800 DEG C, then the temperature of heat-treatment furnace is risen to 1050 DEG C～10150
DEG C, from heat-treatment furnace, take out air cooling after insulation 8h～10h；
The time A of described isothermal holding meets: (D/4-10) min≤A≤(D/4+10) min, wherein D is described in step 103
The diameter of Ti2AlNb alloy cast ingot, the unit of D is millimeter；
Ti2AlNb alloy cast ingot after step 2 hollow cold is wrapped up by step 3, employing asbestos cloth, then will wrap up asbestos
The Ti2AlNb alloy cast ingot of cloth is placed in isothermal holding B min in the heat-treatment furnace that temperature is 750 DEG C～800 DEG C, then by heat treatment
The temperature of stove is taken out after rising to the temperature that cogging is forged and is sent into quick forging machine forging, and the detailed process of forging is: in temperature be first
Carry out cogging forging under conditions of 10170 DEG C～1200 DEG C, then change under conditions of temperature is 1050 DEG C～10100 DEG C
Forging, finally carries out finished product forging under conditions of temperature is 970 DEG C～1020 DEG C, finally gives Ti2AlNb alloy material；Described
Cogging forging is divided into 1 fire time to complete, described in change forging and be divided into 2～4 fire and complete, the forging of described finished product is divided into 1 fire to complete, institute
The deflection of the every fire time state cogging forging, changing forging and finished product forging is 120%～160%；
The time B of described isothermal holding meets: (D/4-10) min≤B≤(D/4+10) min, wherein D is described in step 103
The diameter of Ti2AlNb alloy cast ingot, the unit of D is millimeter.
The preparation method of a kind of Ti2AlNb alloy material the most according to claim 1, it is characterised in that institute in step 3
State the forging temperature that changes changing every fire in forging process secondary to be gradually lowered.
The preparation method of a kind of Ti2AlNb alloy material the most according to claim 1, it is characterised in that institute in step 3
State asbestos cloth and Ti2AlNb alloy cast ingot to connect by iron wire is fixing.
The preparation method of a kind of Ti2AlNb alloy material the most according to claim 1, it is characterised in that institute in step 3
State cogging forging, change every fire of forging and finished product forging and all carry out 2 upsettings 2 and pull out process.
The preparation method of a kind of Ti2AlNb alloy material the most according to claim 1, it is characterised in that in step 3
Before described cogging forging, the hammering block of quick forging machine is preheated to 250 DEG C～300 DEG C.
The preparation method of a kind of Ti2AlNb alloy material the most according to claim 1, it is characterised in that institute in step 3
The thickness stating asbestos cloth is 10mm～20mm.
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| CN111647771B (en) * | 2020-04-17 | 2021-10-15 | 中国航发北京航空材料研究院 | Multi-element composite anti-oxidation Ti2AlNb alloy and preparation method thereof |
| CN111607751A (en) * | 2020-06-09 | 2020-09-01 | 无锡派克新材料科技股份有限公司 | Forging modifying method for Ti2AlNb alloy |
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| CN113981296A (en) * | 2021-12-24 | 2022-01-28 | 北京钢研高纳科技股份有限公司 | Ti2AlNb-based alloy and preparation method and application thereof |
| CN114574718A (en) * | 2022-03-29 | 2022-06-03 | 西北有色金属研究院 | Preparation method of 60NiTi alloy bearing |
| CN114574718B (en) * | 2022-03-29 | 2022-08-16 | 西北有色金属研究院 | Preparation method of 60NiTi alloy bearing |
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| CN116987991B (en) * | 2023-09-26 | 2024-01-23 | 成都先进金属材料产业技术研究院股份有限公司 | Regulating Ti 2 Method for preparing AlNb-based alloy with yield ratio |
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