CN102513479B - Production process for large-diameter fine isometric crystal tissue titanium alloy bar - Google Patents

Production process for large-diameter fine isometric crystal tissue titanium alloy bar Download PDF

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CN102513479B
CN102513479B CN201110367931.1A CN201110367931A CN102513479B CN 102513479 B CN102513479 B CN 102513479B CN 201110367931 A CN201110367931 A CN 201110367931A CN 102513479 B CN102513479 B CN 102513479B
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forging
fire
bar
blank
resistance furnace
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CN102513479A (en
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王学璐
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宝鸡市金盛伟业稀有金属有限公司
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Abstract

The invention provides a production process for a large-diameter fine isometric crystal tissue titanium alloy bar. The production process comprises the following steps of: repeatedly performing substituting forging on a titanium cast ingot which comprises the following raw materials in parts by weight: 6.0-6.2 parts of aluminum, 3.8-4.1 parts of vanadium, less than or equal to 0.10 part of iron, 0.18-0.15 part of oxygen, 0.01 part of carbon, 0.01 part of nitrogen, 0.005 part of hydrogen and the balance of titanium to obtain a bar blank, wherein the macrostructure of the bar blank meets the requirement of lower than grade 3; putting the bar blank into a rolling machine to be rolled into a bar; and annealing the bar.

Description

Major diameter fine isometric crystal tissue titanium alloy bar production technology

Technical field

The invention belongs to metal material processing technical field, be specifically related to a kind of major diameter fine isometric crystal tissue titanium alloy bar production technology.

Background technology

In the titanium alloy of the different trades mark and alloying component, Ti-6Al-4V is that production Technology is the most representative, and the scope of application is the widest, a kind of titanium alloy of consumption maximum, and its combination property and cost cost performance in all titanium alloys is the highest.In recent years, developmental research to various trade mark titanium alloy bar section products trends towards gradually: in production practices process, how to improve and stablize its internal performance and quality, expand its scope of application and condition, to meet Aeronautics and Astronautics, naval vessel and military aspect to the higher level requirement of this alloy and the ever-increasing needs of demand.And it is wherein especially outstanding to this demand of Ti-6Al-4V.The external production at the Ti-6Al-4V in above field bar and buying Shi Junyi U.S. aerospace standard A MS4928 or U.S. army mark MIL-T-9047L are reference standard, in these standards by the aspects such as performance and metallographic strict demand, the combination property of Ti-6Al-4V bar is reached and has met the higher instructions for use in these fields.Rod silk material for small dimension (Φ is below 50), use Φ 470mm titanium ingot to forge with deflection according to normal processing fire, rolling, substantially can produce the small dimension titanium rod that meets standard-required, but there is difficulty in the titanium rod for major diameter specification (Φ 60~Φ 120mm) in production and process: the one, use 2 tons of titanium rods of producing this specification limit with interior titanium ingot of substance, by traditional handicraft, carry out cogging, some fire change forging, forcing press or the moulding of electric liquid hammer finished product, though can meet standard-required, but production efficiency is too low, output can not meet large batch of demand, the 2nd, directly with 2 tons to enter large-scale roll mill rolling after interior titanium ingot cogging, although efficiency has improved, structural strain's rate is inadequate, the microscopic structure requirement that can not meet, the 3rd, use substance and the larger titanium ingot of diameter, carry out cogging, evolution and pull out the size of large-scale roll mill import, rolling again, although can improve final microscopic structure, but harsher to the requirement of the large of equipment and middle operation in cogging and process, and the super large equipment of the machining large-sized titanium ingot of energy is still fewer at home.How utilizing domestic existing conventional equipment high efficiency, low cost, the stay-in-grade high-quality titanium rod that meets AMS4928 standard of producing, is the direction that we study.

Summary of the invention

The technical problem that the present invention solves: a kind of major diameter fine isometric crystal tissue titanium alloy bar production technology is provided, before entering roll mill rolling, through the more than five times forgings that changes, make to be rolled the macrostructure of excellent base before operation and meet 3 grades with interior requirement, guarantee the fine quality of final rolled bar material, after rolling, bar is carried out to annealing in process.

The technical solution used in the present invention: major diameter fine isometric crystal tissue titanium alloy bar production technology, selecting parts by weight of raw materials is aluminium 6.0~6.2, vanadium 3.8~4.1, iron≤0.10, oxygen 0.18~0.15, carbon 0.01, nitrogen 0.01, hydrogen 0.005, surplus is the titanium ingot casting of titanium, and by titanium ingot casting, through being repeatedly forged into as excellent base, the macrostructure of described excellent base meets 3 grades with interior requirement, then excellent base is put into roll mill and be rolled into bar, then bar is carried out to annealing in process.

Above-mentioned repeatedly change to forge comprise the steps:

1) cogging, puts into resistance furnace by titanium ingot casting and is heated to 1150~1200 ℃, is incubated more than 180 minutes, with forcing press, after three upsettings three are pulled out, is split into square billet, and titanium ingot casting deformation rate reaches 120%;

2) two fire change forging, square billet is put into resistance furnace and be heated to above 50~100 ℃ of 990 ℃ of alpha+beta/beta transformation point temperature and change forging, are incubated more than 120 minutes, do three upsettings three again pull out with forcing press, and blank deformation rate reaches 110%;

3) three fire change forging, two fire are changed to blank after forging and put into resistance furnace and be heated to 990 ℃ following 10~20 ℃ of alpha+beta/beta transformation point temperature and change forging, are incubated more than 120 minutes, do three upsettings three pull out with forcing press, and blank deformation rate reaches 110%;

4) four fire change forging, three fire are changed to blank after forging and put into resistance furnace and be heated to 990 ℃ following 20~30 ℃ of alpha+beta/beta transformation point temperature and change forging, are incubated more than 120 minutes, do three upsettings three again pull out with forcing press, and blank deformation rate reaches 110%;

5) five fire change forging, four fire are changed to blank after forging to be put into resistance furnace and is heated to 990 ℃ following 30~40 ℃ of alpha+beta/beta transformation point temperature and changes forging, insulation is more than 120 minutes, and electricity consumption liquid hammer tries again to change to forge and makes blank become excellent base, and blank deformation rate reaches 70%;

6) will through five fire, change the excellent base detail sanding polishing of forging, with washing down with clear water after the corrosion of cyanogen fluoric acid, macrostructure should meet in 3 grades again.If macrostructure does not reach 3 grades with interior requirement, a fire three upsettings three inferior or that several fire are inferior that excellent base is carried out as described in step 5 are again pulled out, until excellent base macrostructure meets 3 grades with interior requirement.

During rolling, first adjust roll mill pass size, excellent base is put into resistance furnace and be heated to 930~940 ℃, be incubated more than 100 minutes, start rolling, excellent base is rolled into bar.

During annealing in process, bar is packed in resistance furnace lower than 500 ℃, be heated to 750~785 ℃ of insulations 100 minutes, air cooling.

Finally, will after bar cool to room temperature, with Centreless lathe, remove surperficial oxygen-rich layer, then carry out local precision straightening, finally cut cut lengths, polishing.

Above-mentioned forcing press is 2500 tons of forcing presses, and described electric liquid hammer is 4 tons of electric liquid hammers, and described resistance furnace is 400KW electric furnace, and described roll mill is excellent base import Φ 180mm model rolling bar machine.

The present invention's advantage compared with prior art:

1, the comparison on material property impact by several composition proportion, finds the scope of most suitable oxygen and iron content, both can meet the raising of intensity, can guarantee the needs of material plasticity again simultaneously;

2, by controlling the inferior deflection of heating-up temperature and every fire, determine and reasonably change forging process, before rod base enters roll mill, through repeatedly changing forging, make the macrostructure of excellent base meet 3 grades with interior requirement, correction only relies on last one rolling process and finally changes and improve other wrong-doing of microscopic structure level;

3, utilize the common bar mill of gathering around use of domestic enterprise, can roll out the tight bar requiring of high standard, reduced again cost, improved benefit.

Accompanying drawing explanation

Fig. 1 is that titanium rod wire net is organized schematic diagram;

Fig. 2 is each rank macrostructure schematic diagram of titanium rod;

Fig. 3 is each rank mirco structure schematic diagram of Ti-6Al-4V;

Fig. 4 is the tiny equiax crystal mirco structure schematic diagram of titanium rod.

The specific embodiment

One, the preparation of titanium ingot, the adjustment of Ti-6Al-4V chemical composition

According to Aeronautics and Astronautics, naval vessel and military aspect, use the needs of actual conditions, we need to be by the performance of Ti-6Al-4V material on the basis of basic demand, make every effort to by the adjustment of other composition in alloy, the mechanical property of lifting material that can be maximum, make material in use can farthest meet or exceed instructions for use, when tensile strength is improved, plasticity does not also reduce.This just need to find an optimum range from the chemical composition proportioning aspect of material.

By alloy element aluminum and content of vanadium in fixed range on the change of Ti-6Al-4V material property and impact can be very not significantly after, the impurity element oxygen in titanium alloy and iron will be the emphasis that we study so.The purity of oxygen and the lower material of iron content is higher, and plasticity is just better, but the tensile strength of material also can reduce simultaneously.Oxygen element belongs to interstitial element in titanium alloy, can improve the degree of stability of the α phase in alloy, promotes the decomposition of metastable β phase.The increase of oxygen element can improve the alpha+beta/β phase transition temperature in titanium alloy, puies forward heavy alloyed room temperature tensile strength simultaneously.Ferro element belongs to beta stable element in titanium alloy, and along with low-alloyed alpha+beta/β phase transition temperature can fall in the increase of content, the room temperature tensile strength of alloy can significantly raise simultaneously, and reduces the plasticity index such as percentage elongation.Therefore, for putting forward heavy alloyed tensile strength, oxygen and iron content in the raising alloy that we can be suitable.Never fall the combination property aspect of low-alloyed transformation temperature, plasticity and alloy and consider, only oxygen content is increased to certain content, do not advocate artificial increase iron content simultaneously.

We are the comparison on material property impact by following several composition proportion, finds the scope of most suitable oxygen and iron content.The Φ 50mmTi-6Al-4V bar longitudinal test piece of taking the heterogeneity under identical fabrication process condition detects.

From the contrast of above data, can find out, the increase of iron and oxygen element has all improved the tensile strength of alloy, represents that the percentage elongation of plasticity and the contraction percentage of area constantly reduce simultaneously.And iron and oxygen element be when all high, although the tensile strength of alloy increases to some extent, plasticity obviously reduces.Therefore the special requirement that we use according to space flight, adopts the content (being the third proportioning) that improves the content of oxygen and do not increase iron in one-level titanium sponge, so both can meet the raising of intensity, can guarantee the needs of material plasticity again simultaneously.

Two, production and processing technology process

That in production reality, adopt due to us is substance 1500Kg, three melting titanium ingots of external diameter Φ 470mm, the process equipment using is 2500 tons of forcing presses, 4 tons of electric liquid hammers, the import of rod base is Φ 180mm model rolling bar machine, so production and processing technology carries out the working ability around these equipment.If according to the production technology of common titanium rod, Φ 470mm titanium ingot is the requirement that meets deformation rate, from cogging, to changing to forge, only need two fire just can enter rolling bar machine to roll out finished product, but mostly the microscopic structure of the titanium rod of producing is like this wire net shape tissue, does not reach requirement.We cannot guarantee that suitable deflection is to reach object and the requirement that changes tissue, crystal grain thinning.Wire net tissue is because deflection in process is not enough, the not exclusively broken and a kind of typical organization that forms of crystal grain, as shown in Figure 1.Wire net tissue is a kind of boundary tissue, and during as the product for civilian use, this tissue is acceptable, but is receptible tissue anything but for Aeronautics and Astronautics etc.Each rank metallographic structure of Ti-6Al-4V as shown in Figure 3.

By long-term experiment with grope, we are verified: can not only rely on the rank that last one rolling process finally changes and improve microscopic structure.Before being rolled machine rolling, must make to be rolled operation blank rod before and there is good tissue through repeatedly reasonably changing forging, be the key that guarantees final rolled bar material fine quality.Therefore reasonably change the critical process that forging process is bar quality quality.We are divided into two parts (60-100) mm and (100-120) mm this interval bar by specification.(60-100) blank of mm specification is used 4 tons of electric liquid hammer equipment to carry out upsetting pull in changing forger order, (100-120) blank of mm specification is used 2500 tons of press equipments to carry out upsetting pull in changing forger order, for guaranteeing the requirement of ultrasonic examination, every fire time final forging temperature can not be lower than 750 ℃ simultaneously.Can obtain like this titanium rod that meets requirements in AMS 4928 standards.

The finished product titanium rod that the production diameter of now take is Φ 100 * 3000mm is example, by following technology mode, reaches the requirements to titanium alloy rod bar.

1, cogging, change determining of forging process

Ti-6Al-4V is a kind of typical alpha+beta alloy.Being processed to form in alpha+beta Liang Xiang district after high power metallographic structure inspection, the Ti-6Al-4V alloy with tiny, uniform α and β equiaxed grain structure, just best combination property can be reached, the basic demand of the use in the fields such as Aeronautics and Astronautics could be met.Our target will be produced exactly has transverse and longitudinal intensity and plasticity is all good, and mechanical property requirements reaches AMS4928 standard-required, and metallographic structure reaches A5 level with interior high-quality bar.

Alpha+beta/beta transformation point temperature of this Ti-6Al-4V ingot casting is 990 ℃ after testing.

(1), cogging

Titanium ingot casting has thick as-cast grain structure, first requires to be broken into little β tissue, requires to produce primary α nucleus on crystal boundary simultaneously.Because the effective travel of 2500 tons of forcing presses limits, must be by highly for the titanium ingot casting of 2000mm be divided into 2~3 sections (being highly about 600~1000mm).At 1150 ℃, with resistance furnace heating titanium ingot casting, be incubated more than 180 minutes, to guarantee whole titanium ingot casting internal and external temperature consistent and uniform.This link firmly can not be used reverberatory furnace heating cogging, because the temperature of reverberatory furnace is uncontrollable, very easily the burning of titanium ingot casting is scrapped.At this temperature, titanium ingot casting resistance of deformation is low, and plasticity is high, is applicable to the cogging requirement that titanium ingot casting adopts large deflection, improves and forges saturating property, sufficient broken as-cast structure.2500 tons of hydraulic presses have good static pressure permeability, and production efficiency is high, are the cogging equipment of forged titanium ingot casting excellence.The titanium ingot casting of Φ 470mm, after three upsettings three are pulled out, is split into the square billet of 460mm.The inferior deformation rate of this fire reaches 120%.At this moment thick casting titanium is organized by preliminary fragmentation.

(2), two fire change forging

Square billet after cogging completes, polish off after blemish and oxygen-rich layer, the second fire will be more than alpha+beta/beta transformation point temperature 50~100 ℃ once change forging, object is to make β phase crystal grain again obtain sufficient fragmentation, makes α generate nucleus between β phase crystal boundary simultaneously.We select 1050 ℃ in 400KW resistance furnace, to heat, and are incubated more than 120 minutes, with three upsettings three that try again of 2500 tons of forcing presses, pull out.The inferior deformation rate of this fire reaches 110%.

(3), three fire change forging

Since the 3rd fire, TC4 material will proceed to alpha+beta/beta transformation point temperature and forge below, object is in order to make original β crystal boundary energy access sufficient transformation, can make α continue nucleation on β crystal boundary simultaneously, obtains the bifurcation tissue of the alpha+beta Liang Xiang district processing of excellent performance.This fire adopts the heating of 400KW resistance furnace, and heating-up temperature is that 970 ℃ of insulations are more than 120 minutes.Using 2500 tons of forcing presses to try again, three upsettings three pull out changes forging.The inferior deformation rate of this fire reaches 110%.

(4), four fire change forging

This fire adopts the heating of 400KW resistance furnace, and heating-up temperature is that 960 ℃ of insulations are more than 120 minutes.Using 2500 tons of forcing presses to try again, a upsetting one pulls out changes forging, blank pulled out to the square billet of 290mm.The inferior deformation rate of this fire reaches 80%.

(5), five fire change forging

Blank is after polishing, band saw blanking, and the 5th fire is used 4 tons of electric liquid hammer equipment to change forging, and this fire is still used the heating of 400KW resistance furnace, and heating-up temperature is that 950 ℃ of insulations are more than 120 minutes.Use 4 tons of electric liquid hammers to try again and change forging, blank is pulled out to the excellent base of 160mm.The inferior deformation rate of this fire reaches 70%.Object of this fire time is further refinement even grained tissue, makes the appearance and size of excellent base meet the requirement of roll mill import stomidium simultaneously.

After this fire finishes, by the detail sanding polishing of excellent base, with washing down with clear water again after the corrosion of cyanogen fluoric acid, observe macrostructure, should meet in 3 grades.If reached, do not require just need to, by the excellent base of 290mm, to use 4 tons of electric liquid hammers to carry out again three upsettings three inferior or that several fire are inferior of a fire and pull out, until macrostructure meets the demands.We change the macrograph forged after this operation as shown in Figure 2.

Specification because single weight is less, can be carried out following technique process at the pole of (60-100) mm:

(1), the first fire, 1150 ℃ with resistance furnace heating titanium ingot casting, is incubated more than 180 minutes, use 2500 tons of forcing presses by the direct cogging of titanium ingot casting the square billet to 230mm, deformation rate is 70%.

(2), polishing, after band saw blanking, second fire time, 1050 ℃ are heated in 400KW resistance furnace, are incubated more than 120 minutes, use 4 tons of electric liquid hammers to do three upsettings three to blank and pull out, deformation rate 120%.

(3), the 3rd fire, 970 ℃ are heated in 400KW resistance furnace, are incubated more than 120 minutes, continue to use 4 tons of electric liquid hammers to do three upsettings three to blank and pull out, deformation rate 120%.

(4), the 4th fire, 960 ℃ in 400KW resistance furnace heating, is incubated more than 120 minutes, uses 4 tons of electric liquid hammers to try again and changes forging, blank is pulled out to the excellent base of the following size of 150mm, deformation rate of this fire time reaches more than 75%.

After this fire finishes, use equally etch to detect blank macrostructure, require to reach in 3 grades.If reached, just do not require after the 3rd fire time, to use 4 tons of electric liquid hammers carry out again a fire time or three inferior upsettings three of several fire are pulled out, until macrostructure is met the demands.

Two, rolling mill practice.

This operation is mainly by ready excellent base, after last fire time thermal deformation, finally rolls into Bang Yu.Reasonable arrangement technical process in this operation, still can further improve the even degree of refinement of microscopic structure.But if excellent base microscopic structure is not good, if want significantly to change and improve microscopic structure rank, improving performance index by this operation, effect can be very not remarkable or impossible.Realize several modes of this operation and the comparison of equipment:

(1) use 1 ton of direct draw out of flat-die hammer, with laing eggs, control diameter and ovality, must double tempering during tune.Adopting this traditional production and processing mode advantage is that equipment tool is simple, with low cost, but shortcoming is quite a lot of, production efficiency is low, and the ovality of whole bar is bad, diameter is very large with the poor deviation of rod, necessary tempering when tune is forged, causes one end or the contiguous position post bake of having forged, and the structural homogenity of whole bar is inconsistent, reduced metallographic rank, this technique is only applicable to bar quantity seldom time.

(2) employing precise forging machine is forged, and domestic precise forging machine is all expensive import equipment at present, only in Ji Jia state-owned unit use individually.Adopting this production and processing mode advantage is that efficiency is higher, blank can forge finished product by a fire, the rule of finishing simultaneously circle, do not need double tempering, guaranteed uniformity and the uniformity of whole bar microscopic structure, ovality and dimensional tolerance can well be controlled simultaneously, and shortcoming is that processing charges is too high, equipment one-time investment is too large, and general enterprise holds and can't stand.

(3) adopt the rolling of rolling bar machine.Current domestic rolling bar machine is very general, and equipment investment is few.Adopt this production and processing mode the shortcoming of two kinds of modes above can be avoided, combine again both advantages simultaneously, preferred plan, can guarantee production high efficiency, can go out finished product by a fire again, guarantee all even uniformity of bar microscopic structure, ovality and tolerance also can well be controlled simultaneously.Concrete machining process:

Because roll mill is in the process of rolling blank, speed is very fast, and deflection is also very large, causes metal inside distortion heat shock to increase, and causes bar hot-spot.Therefore we adopt heating-up temperature on the low side can not produce heat affecting to guarantee the temperature rise that distortion heat causes.930~940 ℃ of resistance furnace heating, are incubated more than 100 minutes, start rolling.Roll mill pass size is transferred to Φ 105+1mm, like this dimensional requirement that strips off the skin of guarantee finished product bar Φ 100 * 3000mm.

Three, annealing process.

To titanium rod, final mechanical property and metallographic structure plays vital effect in the annealing of Ti-6Al-4V titanium alloy.The object of alloy material annealing not only can be improved structure property by the recrystallization of crystal grain, and being attended by the dissolving of compound and the polymorphism of α → β phase changes, the structural stress that simultaneously metal inside in hot and cold processing can be produced is released, and makes the machining in later stage easily realize and can not produce stress deformation.Only there is the recrystallization of α phase in the annealing for the such alpha+beta alloy of Ti-6Al-4V below transformation temperature, so the material after heat treatment still can keep the bifurcation institutional framework of alpha+beta Liang Xiang district processing.We adopt at the temperature of following 150-250 ℃ of alpha+beta/beta transformation point temperature and do full annealing technique.The microscopic structure of certain combination property that object is stable in order to obtain, plasticity is good or corresponding.Mainly there is the recrystallization of α phase in this process.As excess Temperature can cause unnecessary oxidation and grain growth.A lot of tests and demonstration have been carried out in research for Ti-6Al-4V anneal of material in the past, and we just do not do unnecessary trial here, just the achievement of research are directly applied and just can in this is produced.The Technology for Heating Processing that we adopt is: in resistance-heated furnace, and lower than 500 ℃ of shove charges, 750-785 ℃ of insulation 100 minutes (selecting holding temperature and temperature retention time according to the thickness of diameter of the rod), air cooling.

Four, Surface of Rod Bar processing technology.

Because the room temperature elasticity of Ti-6Al-4V bar is very large, so the aligning of bar must be taked in time thermal straightening after annealing.Small dimension can be aligned with multi-roll straightening machine, and large specification can adopt artificial aligning.After cool to room temperature, with Centreless lathe (flaying machine), remove surperficial oxygen-rich layer, by different size diameter tolerance requirement in standard, add and make man-hour allowance control in critical field.Then carry out local precision straightening, its objective is as guaranteeing the requirement of bar glacing flatness.Finally cut cut lengths, polishing.

Five, Metallographic Analysis, carrying out flaw detection:

We use the finished product bar of supersonic detector effects on surface fineness Ra≤3.2 to detect by root, with reference to AMS 2631B standard, single reflected signal≤1.2mm, a plurality of reflected signal < 0.8mm, clutter echo signal < 1.2mm, meets the A1 level requirement in standard.

We respectively get two groups of mechanical property samples along the vertical, horizontal of bar, and one group of lateral cross section circle, gets one group of mirco structure sample along bar lateral cross section 1/2 radius, send physics and chemistry Spot detection, and Detection of content has room-temperature mechanical property, mirco structure.Testing result is as follows:

Φ 100mm Ti-6Al-4V bar room-temperature mechanical property

Metallographic structure photo as shown in Figure 4.

In a word, according to AMS4928 standard, mechanical property has all reached requirement, macrostructure is without visual visible physics and metallurgical imperfection, high power metallographic structure is the bifurcation equiaxed structure structure of tiny uniform alpha+beta Liang Xiang district processing, rank judgement is in A3 level, and ultrasonic examination detects and meets the A1 level in standard A MS2631B.By above every detection, prove that the machining process of the Ti-6Al-4V titanium alloy bar that we are definite is can meet the service condition of Aeronautics and Astronautics, naval vessel and military aspect completely, and can meet large batch of suitability for industrialized production processing, production cost is low, and efficiency is high, good stability.

Above-described embodiment, is preferred embodiment of the present invention, is not used for limiting the scope of the present invention, and the equivalence of being done with content described in the claims in the present invention therefore all changes, within all should being included in the claims in the present invention scope.

Claims (5)

1. major diameter fine isometric crystal tissue titanium alloy bar production technology, is characterized in that: selecting parts by weight of raw materials is aluminium 6.0~6.2, vanadium 3.8~4.1, iron≤0.10, oxygen 0.18~0.15, carbon 0.01, nitrogen 0.01, hydrogen 0.005, surplus is the titanium ingot casting of titanium, and by titanium ingot casting, through being repeatedly forged into as excellent base, the macrostructure of described excellent base meets 3 grades with interior requirement, then excellent base is put into roll mill and be rolled into bar, then bar is carried out to annealing in process; Described repeatedly change to forge comprise the steps:
1) cogging, puts into resistance furnace by titanium ingot casting and is heated to 1150~1200 ℃, is incubated more than 180 minutes, with forcing press, after three upsettings three are pulled out, is split into square billet, and titanium ingot casting deformation rate reaches 120%;
2) two fire change forging, square billet is put into resistance furnace and be heated to above 50~100 ℃ of 990 ℃ of alpha+beta/beta transformation point temperature and change forging, are incubated more than 120 minutes, do three upsettings three again pull out with forcing press, and blank deformation rate reaches 110%;
3) three fire change forging, two fire are changed to blank after forging and put into resistance furnace and be heated to 990 ℃ following 10~20 ℃ of alpha+beta/beta transformation point temperature and change forging, are incubated more than 120 minutes, do three upsettings three pull out with forcing press, and blank deformation rate reaches 110%;
4) four fire change forging, three fire are changed to blank after forging and put into resistance furnace and be heated to 990 ℃ following 20~30 ℃ of alpha+beta/beta transformation point temperature and change forging, are incubated more than 120 minutes, do three upsettings three again pull out with forcing press, and blank deformation rate reaches 110%;
5) five fire change forging, four fire are changed to blank after forging to be put into resistance furnace and is heated to 990 ℃ following 30~40 ℃ of alpha+beta/beta transformation point temperature and changes forging, insulation is more than 120 minutes, and electricity consumption liquid hammer tries again to change to forge and makes blank become excellent base, and blank deformation rate reaches 70%;
6) will through five fire, change the excellent base detail sanding polishing of forging, with washing down with clear water after the corrosion of cyanogen fluoric acid, macrostructure should meet 3 grades with interior requirement again.
2. major diameter fine isometric crystal tissue titanium alloy bar production technology according to claim 1, it is characterized in that: during rolling, first adjust roll mill pass size, excellent base is put into resistance furnace and be heated to 930~940 ℃, insulation is more than 100 minutes, start rolling, excellent base is rolled into bar.
3. major diameter fine isometric crystal tissue titanium alloy bar production technology according to claim 1, is characterized in that: bar is packed in resistance furnace lower than 500 ℃, be heated to 750~785 ℃ of insulations 100 minutes, air cooling.
4. according to the major diameter fine isometric crystal tissue titanium alloy bar production technology described in claim 1,2 or 3, it is characterized in that: will after bar cool to room temperature, with Centreless lathe, remove surperficial oxygen-rich layer, then carry out local precision straightening, finally cut cut lengths, polishing.
5. major diameter fine isometric crystal tissue titanium alloy bar production technology according to claim 4, it is characterized in that: described forcing press is 2500 tons of forcing presses, described electric liquid hammer is 4 tons of electric liquid hammers, described resistance furnace is 400KW electric furnace, and described roll mill is excellent base import Φ 180mm model rolling bar machine.
CN201110367931.1A 2011-11-18 2011-11-18 Production process for large-diameter fine isometric crystal tissue titanium alloy bar CN102513479B (en)

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CN104532060A (en) * 2014-12-22 2015-04-22 西安西工大超晶科技发展有限责任公司 Ti-6Al-4V improved titanium alloy and processing method thereof
CN105112831B (en) * 2015-09-14 2017-08-04 沈阳泰恒通用技术有限公司 A kind of preparation method of the titanium alloy ring materials of BT5 1 used under low temperature environment
CN105251804B (en) * 2015-10-28 2018-05-08 西部超导材料科技股份有限公司 A kind of milling method of six square rod of TC6 titanium alloys
CN105382174B (en) * 2015-11-23 2017-12-08 沈阳黎明航空发动机(集团)有限责任公司 A kind of eliminate forges the clear brilliant technique of low power on titanium alloy forging hammer
CN106222467B (en) * 2016-07-19 2018-02-13 中南大学 A kind of titanium with high-orientation stratiform orientation interconnected pore and preparation method thereof
CN107838343A (en) * 2016-12-01 2018-03-27 贵州安大航空锻造有限责任公司 Titanium alloy rustless steel double-metal ring parts rolling forming method
CN106636744A (en) * 2016-12-14 2017-05-10 西部超导材料科技股份有限公司 WSTi64E high-damage-tolerance super-large-size titanium alloy cast ingot and preparation method thereof
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CN107282687B (en) * 2017-05-22 2019-05-24 西部超导材料科技股份有限公司 A kind of preparation method of Ti6Al4V titanium alloy fine grain bar
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