CN104726746B - High-strength metastable beta-type titanium alloy bar and production method thereof - Google Patents
High-strength metastable beta-type titanium alloy bar and production method thereof Download PDFInfo
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Abstract
The invention discloses a high-strength metastable beta-type titanium alloy bar. The high-strength metastable beta-type titanium alloy bar comprises, by atomic percent, 13% of Al, 5% of V, 5% of Mo, 4%-6% of Cr and the balance Ti and inevitable impurities. Additionally, the invention further discloses a production method of the high-strength metastable beta-type titanium alloy bar. The production method includes firstly, preparing titanium alloy casting ingots; secondly, producing forging billets by billet forging; thirdly, producing a semi-finished titanium alloy bar by upsetting and stretching forging and radial forging; fourthly, subjecting the semi-finished titanium alloy bar to solid solution treatment and aging treatment so as to obtain the metastable beta-type titanium alloy bar. The high-strength metastable beta-type titanium alloy bar produced by the specific heat forging technique and a solid solution and aging treatment system has excellent comprehensive mechanical property; at the room temperature, tensile strength of the high-strength metastable beta-type titanium alloy bar is not less than 1290MPa, yield strength thereof is not less than 1190MPa, elongation percentage thereof is not less than 11%, and section shrinkage rate thereof is not less than 45%.
Description
Technical field
The invention belongs to titanium alloy material preparing technical field is and in particular to a kind of high-strength metastable beta-type titanium alloy bar
And preparation method thereof.
Background technology
Titanium alloy, because having higher specific strength and good comprehensive mechanical property, has been widely used in aviation, boat
My god, the field such as ship, oil, chemical industry, Vehicle Engineering and biomedical engineering.High-strength titanium alloy typically refers to thermally treated rear chamber
Warm tensile strength rmTitanium alloy not less than 1100mpa.Beta titanium alloy has excellent cool thermoplastic's processing characteristics and easy forging
Deformation performance, can obtain higher comprehensive mechanical property by solid solution+Ageing Treatment or thermomechanical treatment process.At present, state
The inside and outside high-strength beta titanium alloy obtaining practical application on aviation aircraft mainly has ti-10v-2fe-3al (ti-1023),
Ti-5al-5mo-5v-1fe-1cr (bt22), ti-15mo-2.7nb-3al-0.2si (β -21s), ti-8v-6cr-4mo-4zr-
3al (β-c), ti-5al-5mo-5v-3cr-0.6fe (timetal555), ti-5al-5v-5mo-3cr-1zr (vst55531),
Ti-3al-5mo-5v-8cr (tb2) etc..Generally, the β phase coefficient of stability >=1 of beta titanium alloy, the β phase coefficient of stability is 1.5～2.5
Between beta titanium alloy be called metastable beta-type titanium alloy.Beta titanium alloy rapidly cools down after the solid solution of β monophase field and can obtain almost
The microscopic structure of all metastable β phases, there is phase decomposition in metastable β in low temperature aging heat treatment process, on β matrix more
Dissipate and separate out tiny secondaryαphase (αs) so that the intensity of alloy increases.The comprehensive mechanical property of metastable beta-type titanium alloy mainly takes
Certainly in alloying component, heat processing technique, heat treating regime and microscopic structure (include grain size, grain boundaries α phase amount of precipitation, nascent
With the pattern of secondaryαphase and size etc.).
Ti-5mo-5v-8cr-3al alloy (tb2) is a kind of metastable beta-type titanium alloy, there are some researches show: this alloy tool
Have that intensity is high, quenching degree and the excellent comprehensive mechanical property such as fracture toughness is good.But, tb2 alloy is being used as heavy in section
During forging structure part, the elongation percentage when finding that it can forge processing characteristics and have high intensity using process is all not as good as high intensity
Alpha and beta type titan alloy.High-alloying is to cause metastable beta-type titanium alloy tb2 heavy in section forging structure part elongation percentage low and can forge
The one of the main reasons of poor processability.Cr content in tb2 titanium alloy is 8%, its cr compared with other beta titanium alloys of early stage
Content higher so that the β knee pointy temperature (t of alloyβ) relatively low, in the forging processing of β phase region, there is no α due in microscopic structure
Phase, and broken β crystal grain heated in forging process again repeatedly, causes crystal grain to be grown up again, causes microscopic structure to be roughened, this
The elongation percentage of alloy will be had a strong impact on.In addition, high cr content also can make resistance of deformation during forging deformation for the tb2 alloy
Increase, cause forging temperature high, fiery secondary many, extend the hot procedure of whole forging, cause final forge hot tissue thick, fall
The low temperature-room type plasticity of alloy.
Content of the invention
The technical problem to be solved is for above-mentioned deficiency of the prior art, provides a kind of high-strength metastable
Determine beta titanium alloy bar, this high-strength metastable beta-type titanium alloy bar has excellent comprehensive mechanical property: under room temperature condition
Tensile strength >=1290mpa, yield strength >=1190mpa, elongation percentage >=11%, the contraction percentage of area >=45%.
For solving above-mentioned technical problem, the technical solution used in the present invention is: a kind of high-strength metastable beta-type titanium alloy rod
Material is it is characterised in that be grouped into by the one-tenth of following atomic percent: al 3%, v 5%, mo 5%, cr 4%～6%, surplus
For ti and inevitable impurity；Described high-strength metastable beta-type titanium alloy bar tensile strength at ambient temperature >=
1290mpa.
Above-mentioned a kind of high-strength metastable beta-type titanium alloy bar is it is characterised in that be grouped by the one-tenth of following atomic percent
Become: al 3%, v 5%, mo 5%, cr 4%, balance of ti and inevitable impurity.
Above-mentioned a kind of high-strength metastable beta-type titanium alloy bar is it is characterised in that be grouped by the one-tenth of following atomic percent
Become: al 3%, v 5%, mo 5%, cr 5%, balance of ti and inevitable impurity.
Above-mentioned a kind of high-strength metastable beta-type titanium alloy bar is it is characterised in that be grouped by the one-tenth of following atomic percent
Become: al 3%, v 5%, mo 5%, cr 6%, balance of ti and inevitable impurity.
Further, present invention also offers the method preparing this high-strength metastable beta-type titanium alloy bar, its feature exists
In comprising the following steps:
Step one, by 0 grade of titanium sponge, molybdenum powder, al-v intermediate alloy and chromium piece by design composition mix homogeneously after be pressed into
Electrode bar, multiple electrodes rod is welded into electrode, then described electrode is placed in vacuum arc melting furnace, through three meltings
Prepare titan alloy casting ingot；
Step 2, titan alloy casting ingot described in step one is placed in 3150t hydraulic press, is 1100 DEG C～1200 in temperature
Carry out cogging forging under conditions of DEG C, obtain forging stock；
Step 3, forging stock described in step 2 is placed in 1250t high-speed hydranlic press, the bar being 850 DEG C～950 DEG C in temperature
Carry out pier under part and pull out forging, obtain forging, then described forging is placed in precise forging machine, the bar being 750 DEG C～850 DEG C in temperature
Carry out radial forging under part, obtain semi-finished product titanium alloy rod bar；
Step 4, semi-finished product titanium alloy rod bar described in step 3 are incubated under conditions of 750 DEG C～800 DEG C 30min
～60min carries out solution treatment, then cool to the furnace 500 DEG C～600 DEG C insulation 2h～8h carry out Ageing Treatment, be then air cooled to
Room temperature, obtains metastable beta-type titanium alloy bar.
Above-mentioned method it is characterised in that the particle mean size of 0 grade of titanium sponge described in step one is not more than 13.0mm, institute
The particle mean size stating chromium piece is not more than 2mm.
Above-mentioned method is it is characterised in that the quality purity of molybdenum powder described in step one and chromium piece is all not less than 99.9%.
Above-mentioned method is it is characterised in that adopt infrared thermometer to monitor during radial forging described in step 3
Forging surface temperature is it is ensured that the excursion of radial forging temperature is in -10 DEG C～10 DEG C.
Above-mentioned method is it is characterised in that the cross section of semi-finished product titanium alloy rod bar described in step 3 is circle, described
A diameter of 85mm～90mm of cross section.
The present invention compared with prior art has the advantage that
1st, the present invention high-strength metastable beta-type titanium alloy bar has excellent comprehensive mechanical property: anti-under room temperature condition
Tensile strength >=1290mpa, yield strength >=1190mpa, elongation percentage >=11%, the contraction percentage of area >=45%.
2nd, the present invention passes through to reduce the content of beta stable element cr in titanium alloy, improves transformation temperature, reduces the high temperature of titanium alloy
Resistance of deformation, obtains thinner forging tissue, it is possible to increase the malleability of titanium alloy and elongation percentage, the titanium alloy bar preparing
Material has good intensity and plasticity coupling.
3rd, the present invention adopts specific hot-working forging technology and fixation rates system so that β in original as cast condition
Crystal grain can pull out in forging and the hot procedure of radial forging and fully be crushed in cogging forging, pier, in radial forging
During can optimize and temperature monitoring is carried out to forging surface using infrared thermometer it is ensured that the excursion of radial forging temperature
In -10 DEG C～10 DEG C so that during radial forging forging to obtain resistance of deformation little, easy to control, with after through solution treatment and
Secondaryαphase in titanium alloy disperse educt on β matrix is enabled to, so that titanium alloy rod bar has after Ageing Treatment
Also there is while high intensity good plasticity, disclosure satisfy that the mechanical property demand of part aerospace structure part.
Below by drawings and Examples, technical scheme is described in further detail.
Brief description
Fig. 1 is the metallographic structure figure of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 1.
Fig. 2 is the sem photo of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 1.
Fig. 3 is the metallographic structure figure of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 2.
Fig. 4 is the sem photo of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 2.
Fig. 5 is the metallographic structure figure of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 3.
Fig. 6 is the sem photo of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 3.
Fig. 7 is the metallographic structure figure of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 4.
Fig. 8 is the sem photo of the high-strength metastable beta-type titanium alloy bar of the embodiment of the present invention 4.
Specific embodiment
Used in the embodiment of the present invention 1～embodiment 6, the manufacturer of 1250t high-speed hydranlic press has for the Jiangsu work of nature world
Limit company.
Embodiment 1
The present embodiment high-strength metastable beta-type titanium alloy bar is grouped into by the one-tenth of following atomic percent: al 3%, v
5%, mo 5%, cr 4%, balance of ti and inevitable impurity；Described high-strength metastable beta-type titanium alloy bar is in room temperature
Under the conditions of tensile strength >=1290mpa.
The preparation method of the present embodiment high-strength metastable beta-type titanium alloy bar comprises the following steps:
Step one, by 0 grade of titanium sponge, molybdenum powder, al-v intermediate alloy and chromium piece by design composition mix homogeneously after be pressed into
Electrode bar, 4 electrode bars is welded into electrode, then described electrode is placed in vacuum arc melting furnace, through three meltings
Prepare titan alloy casting ingot；The particle mean size of described 0 grade of titanium sponge is not more than 13.0mm, and the particle mean size of described chromium piece is little
In 2mm, the quality purity of described molybdenum powder and chromium piece is all not less than 99.9%；
Step 2, titan alloy casting ingot described in step one is placed in 3150t hydraulic press, the condition being 1200 DEG C in temperature
Under carry out cogging forging, obtain forging stock；The cross section of described forging stock is square, the size of described cross section be 210mm ×
210mm；
Step 3, forging stock described in step 2 is placed in 1250t high-speed hydranlic press, enters under conditions of temperature is 950 DEG C
Row pier pulls out forging, obtains forging, then described forging is placed in precise forging machine, carries out radially under conditions of temperature is 850 DEG C
Forging, obtains semi-finished product titanium alloy rod bar；Infrared thermometer monitoring forging surface temperature is adopted during described radial forging
Degree is it is ensured that the excursion of radial forging temperature is in -10 DEG C～10 DEG C；The cross section of described semi-finished product titanium alloy rod bar is circle
Shape, a diameter of 90mm of described cross section；
Step 4, semi-finished product titanium alloy rod bar described in step 3 are incubated under conditions of 800 DEG C 30min and carry out solid solution
Process, then cool to 600 DEG C of insulation 2h with the furnace and carry out Ageing Treatment, be then air cooled to room temperature, obtain high-strength metastable beta-type titanium and close
Golden bar.
The mechanical property of the present embodiment high-strength metastable beta-type titanium alloy bar is tested, result is that tension is strong under room temperature condition
Spend for 1340mpa, yield strength is 1220mpa, elongation percentage is 11%, the contraction percentage of area is 45%.
The microscopic structure of high-strength metastable beta-type titanium alloy bar manufactured in the present embodiment is can be seen that from Fig. 1 and Fig. 2
In the needle-like secondaryαphase of a large amount of Dispersed precipitate is separated out on original β matrix, and the length of secondaryαphase is about 2 μm～3 μm, and β is brilliant
Uniformly separate out tiny diffusion-type secondaryαphase in grain and can ensure that this titanium alloy rod bar has high intensity and good plasticity
Join.
Embodiment 2
The present embodiment high-strength metastable beta-type titanium alloy bar is grouped into by the one-tenth of following atomic percent: al 3%, v
5%, mo 5%, cr 5%, balance of ti and inevitable impurity；Described high-strength metastable beta-type titanium alloy bar is in room temperature
Under the conditions of tensile strength >=1290mpa.
The preparation method of the present embodiment high-strength metastable beta-type titanium alloy bar comprises the following steps:
Step one, by 0 grade of titanium sponge, molybdenum powder, al-v intermediate alloy and chromium piece by design composition mix homogeneously after be pressed into
Electrode bar, 3 electrode bars is welded into electrode, then described electrode is placed in vacuum arc melting furnace, through three meltings
Prepare titan alloy casting ingot；The particle mean size of described 0 grade of titanium sponge is not more than 13.0mm, and the particle mean size of described chromium piece is little
In 2mm, the quality purity of described molybdenum powder and chromium piece is all not less than 99.9%；
Step 2, titan alloy casting ingot described in step one is placed in 3150t hydraulic press, the condition being 1150 DEG C in temperature
Under carry out cogging forging, obtain forging stock；The cross section of described forging stock is square, the size of described cross section be 210mm ×
210mm；
Step 3, forging stock described in step 2 is placed in 1250t high-speed hydranlic press, enters under conditions of temperature is 900 DEG C
Row pier pulls out forging, obtains forging, then described forging is placed in precise forging machine, carries out radially under conditions of temperature is 800 DEG C
Forging, obtains semi-finished product titanium alloy rod bar；Infrared thermometer monitoring forging surface temperature is adopted during described radial forging
Degree is it is ensured that the excursion of radial forging temperature is in -10 DEG C～10 DEG C；The cross section of described semi-finished product titanium alloy rod bar is circle
Shape, a diameter of 90mm of described cross section；
Step 4, semi-finished product titanium alloy rod bar described in step 3 are incubated under conditions of 750 DEG C 60min and carry out solid solution
Process, then cool to 550 DEG C of insulation 4h with the furnace and carry out Ageing Treatment, be then air cooled to room temperature, obtain high-strength metastable beta-type titanium and close
Golden bar.
The mechanical property of the present embodiment high-strength metastable beta-type titanium alloy bar is tested, result is that tension is strong under room temperature condition
Spend for 1290mpa, yield strength is 1190mpa, elongation percentage is 12.5%, the contraction percentage of area is 48%.
The microscopic structure of high-strength metastable beta-type titanium alloy bar manufactured in the present embodiment is can be seen that from Fig. 3 and Fig. 4
In the needle-like secondaryαphase of a large amount of Dispersed precipitate is separated out on original β matrix, and the length of secondaryαphase is about 3 μm～5 μm, and β is brilliant
Uniformly separate out tiny diffusion-type secondaryαphase in grain and can ensure that this titanium alloy rod bar has high intensity and good plasticity
Join.
Embodiment 3
The present embodiment high-strength metastable beta-type titanium alloy bar is grouped into by the one-tenth of following atomic percent: al 3%, v
5%, mo 5%, cr 6%, balance of ti and inevitable impurity；Described high-strength metastable beta-type titanium alloy bar is in room temperature
Under the conditions of tensile strength >=1290mpa.
The preparation method of the present embodiment high-strength metastable beta-type titanium alloy bar comprises the following steps:
Step one, by 0 grade of titanium sponge, molybdenum powder, al-v intermediate alloy and chromium piece by design composition mix homogeneously after be pressed into
Electrode bar, 3 electrode bars is welded into electrode, then described electrode is placed in vacuum arc melting furnace, through three meltings
Prepare titan alloy casting ingot；The particle mean size of described 0 grade of titanium sponge is not more than 13.0mm, and the particle mean size of described chromium piece is little
In 2mm, the quality purity of described molybdenum powder and chromium piece is all not less than 99.9%；
Step 2, titan alloy casting ingot described in step one is placed in 3150t hydraulic press, the condition being 1100 DEG C in temperature
Under carry out cogging forging, obtain forging stock；The cross section of described forging stock is square, the size of described cross section be 210mm ×
210mm；
Step 3, forging stock described in step 2 is placed in 1250t high-speed hydranlic press, enters under conditions of temperature is 850 DEG C
Row pier pulls out forging, obtains forging, then described forging is placed in precise forging machine, carries out radially under conditions of temperature is 750 DEG C
Forging, obtains semi-finished product titanium alloy rod bar；Infrared thermometer monitoring forging surface temperature is adopted during described radial forging
Degree is it is ensured that the excursion of radial forging temperature is in -10 DEG C～10 DEG C；The cross section of described semi-finished product titanium alloy rod bar is circle
Shape, a diameter of 90mm of described cross section；
Step 4, semi-finished product titanium alloy rod bar described in step 3 are incubated under conditions of 750 DEG C 30min and carry out solid solution
Process, then cool to 500 DEG C of insulation 8h with the furnace and carry out Ageing Treatment, be then air cooled to room temperature, obtain high-strength metastable beta-type titanium and close
Golden bar.
The mechanical property of the present embodiment high-strength metastable beta-type titanium alloy bar is tested, result is that tension is strong under room temperature condition
Spend for 1300mpa, yield strength is 1210mpa, elongation percentage is 12.1%, the contraction percentage of area is 46%.
As can be known from Fig. 5 and Fig. 6, the microscopic structure of high-strength metastable beta-type titanium alloy bar manufactured in the present embodiment
In the needle-like secondaryαphase of a large amount of Dispersed precipitate is separated out on original β matrix, and the length of secondaryαphase is about 3 μm～6 μm, and β is brilliant
Uniformly separate out tiny diffusion-type secondaryαphase in grain and can ensure that this titanium alloy rod bar has high intensity and good plasticity
Join.
Embodiment 4
The present embodiment high-strength metastable beta-type titanium alloy bar is grouped into by the one-tenth of following atomic percent: al 3%, v
5%, mo 5%, cr 6%, balance of ti and inevitable impurity；Described high-strength metastable beta-type titanium alloy bar is in room temperature
Under the conditions of tensile strength >=1290mpa.
The preparation method of the present embodiment high-strength metastable beta-type titanium alloy bar comprises the following steps:
Step one, by 0 grade of titanium sponge, molybdenum powder, al-v intermediate alloy and chromium piece by design composition mix homogeneously after be pressed into
Electrode bar, 4 electrode bars is welded into electrode, then described electrode is placed in vacuum arc melting furnace, through three meltings
Prepare titan alloy casting ingot；The particle mean size of described 0 grade of titanium sponge is not more than 13.0mm, and the particle mean size of described chromium piece is little
In 2mm, the quality purity of described molybdenum powder and chromium piece is all not less than 99.9%；
Step 2, titan alloy casting ingot described in step one is placed in 3150t hydraulic press, the condition being 1100 DEG C in temperature
Under carry out cogging forging, obtain forging stock；The cross section of described forging stock is square, the size of described cross section be 210mm ×
210mm；
Step 3, forging stock described in step 2 is placed in 1250t high-speed hydranlic press, enters under conditions of temperature is 850 DEG C
Row pier pulls out forging, obtains forging, then described forging is placed in precise forging machine, carries out radially under conditions of temperature is 750 DEG C
Forging, obtains semi-finished product titanium alloy rod bar；Infrared thermometer monitoring forging surface temperature is adopted during described radial forging
Degree is it is ensured that the excursion of radial forging temperature is in -10 DEG C～10 DEG C；The cross section of described semi-finished product titanium alloy rod bar is circle
Shape, a diameter of 90mm of described cross section；
Step 4, semi-finished product titanium alloy rod bar described in step 3 are incubated under conditions of 750 DEG C 30min and carry out solid solution
Process, then cool to 500 DEG C of insulation 6h with the furnace and carry out Ageing Treatment, be then air cooled to room temperature, obtain high-strength metastable beta-type titanium and close
Golden bar.
The mechanical property of the present embodiment high-strength metastable beta-type titanium alloy bar is tested, result is that tension is strong under room temperature condition
Spend for 1295mpa, yield strength is 1208mpa, elongation percentage is 12.3%, the contraction percentage of area is 48%.
The microscopic structure of high-strength metastable beta-type titanium alloy bar manufactured in the present embodiment is can be seen that from Fig. 7 and Fig. 8
In the needle-like secondaryαphase of a large amount of Dispersed precipitate is separated out on original β matrix, and the length of secondaryαphase is about 2 μm～4 μm, and β is brilliant
Uniformly separate out tiny diffusion-type secondaryαphase in grain and can ensure that this titanium alloy rod bar has high intensity and good plasticity
Join.
Embodiment 5
The present embodiment high-strength metastable beta-type titanium alloy bar is grouped into by the one-tenth of following atomic percent: al 3%, v
5%, mo 5%, cr 4.5%, balance of ti and inevitable impurity；Described high-strength metastable beta-type titanium alloy bar is in room
Tensile strength >=1290mpa under the conditions of temperature.
The preparation method of the present embodiment high-strength metastable beta-type titanium alloy bar comprises the following steps:
Step one, by 0 grade of titanium sponge, molybdenum powder, al-v intermediate alloy and chromium piece by design composition mix homogeneously after be pressed into
Electrode bar, 3 electrode bars is welded into electrode, then described electrode is placed in vacuum arc melting furnace, through three meltings
Prepare titan alloy casting ingot；The particle mean size of described 0 grade of titanium sponge is not more than 13.0mm, and the particle mean size of described chromium piece is little
In 2mm, the quality purity of described molybdenum powder and chromium piece is all not less than 99.9%；
Step 2, titan alloy casting ingot described in step one is placed in 3150t hydraulic press, the condition being 1120 DEG C in temperature
Under carry out cogging forging, obtain forging stock；The cross section of described forging stock is square, the size of described cross section be 200mm ×
200mm；
Step 3, forging stock described in step 2 is placed in 1250t high-speed hydranlic press, enters under conditions of temperature is 900 DEG C
Row pier pulls out forging, obtains forging, then described forging is placed in precise forging machine, carries out radially under conditions of temperature is 850 DEG C
Forging, obtains semi-finished product titanium alloy rod bar；Infrared thermometer monitoring forging surface temperature is adopted during described radial forging
Degree is it is ensured that the excursion of radial forging temperature is in -10 DEG C～10 DEG C；The cross section of described semi-finished product titanium alloy rod bar is circle
Shape, a diameter of 85mm of described cross section；
Step 4, semi-finished product titanium alloy rod bar described in step 3 are incubated under conditions of 780 DEG C 45min and carry out solid solution
Process, then cool to 540 DEG C of insulation 5h with the furnace and carry out Ageing Treatment, be then air cooled to room temperature, obtain high-strength metastable beta-type titanium and close
Golden bar.
The mechanical property of the present embodiment high-strength metastable beta-type titanium alloy bar is tested, result is that tension is strong under room temperature condition
Spend for 1293mpa, yield strength is 1195mpa, elongation percentage is 12.2%, the contraction percentage of area is 47%.
Embodiment 6
The present embodiment high-strength metastable beta-type titanium alloy bar is grouped into by the one-tenth of following atomic percent: al 3%, v
5%, mo 5%, cr 5.5%, balance of ti and inevitable impurity；Described high-strength metastable beta-type titanium alloy bar is in room
Tensile strength >=1290mpa under the conditions of temperature.
The preparation method of the present embodiment high-strength metastable beta-type titanium alloy bar comprises the following steps:
Step one, by 0 grade of titanium sponge, molybdenum powder, al-v intermediate alloy and chromium piece by design composition mix homogeneously after be pressed into
Electrode bar, 4 electrode bars is welded into electrode, then described electrode is placed in vacuum arc melting furnace, through three meltings
Prepare titan alloy casting ingot；The particle mean size of described 0 grade of titanium sponge is not more than 13.0mm, and the particle mean size of described chromium piece is little
In 2mm, the quality purity of described molybdenum powder and chromium piece is all not less than 99.9%；
Step 2, titan alloy casting ingot described in step one is placed in 3150t hydraulic press, the condition being 1150 DEG C in temperature
Under carry out cogging forging, obtain forging stock；The cross section of described forging stock is square, the size of described cross section be 205mm ×
205mm；
Step 3, forging stock described in step 2 is placed in 1250t high-speed hydranlic press, enters under conditions of temperature is 920 DEG C
Row pier pulls out forging, obtains forging, then described forging is placed in precise forging machine, carries out radially under conditions of temperature is 830 DEG C
Forging, obtains semi-finished product titanium alloy rod bar；Infrared thermometer monitoring forging surface temperature is adopted during described radial forging
Degree is it is ensured that the excursion of radial forging temperature is in -10 DEG C～10 DEG C；The cross section of described semi-finished product titanium alloy rod bar is circle
Shape, a diameter of 85mm of described cross section；
Step 4, semi-finished product titanium alloy rod bar described in step 3 are incubated under conditions of 760 DEG C 40min and carry out solid solution
Process, then cool to 550 DEG C of insulation 4h with the furnace and carry out Ageing Treatment, be then air cooled to room temperature, obtain high-strength metastable beta-type titanium and close
Golden bar.
The mechanical property of the present embodiment high-strength metastable beta-type titanium alloy bar is tested, result is that tension is strong under room temperature condition
Spend for 1291mpa, yield strength is 1194mpa, elongation percentage is 12.0%, the contraction percentage of area is 45%.
The above, be only presently preferred embodiments of the present invention, not the present invention imposed any restrictions, every according to the present invention
Any simple modification, change and equivalent structure change that technical spirit is made to above example, all still fall within skill of the present invention
In the protection domain of art scheme.
Claims (7)
1. a kind of high-strength metastable beta-type titanium alloy bar is it is characterised in that be grouped into by the one-tenth of following atomic percent: al
3%, v 5%, mo 5%, cr 4%～6%, balance of ti and inevitable impurity；Described high-strength metastable beta-type titanium alloy
Bar tensile strength >=1290mpa at ambient temperature；
The preparation method of this high-strength metastable beta-type titanium alloy bar is:
Step one, by 0 grade of titanium sponge, molybdenum powder, al-v intermediate alloy and chromium piece by design composition mix homogeneously after be pressed into electrode
Rod, multiple electrodes rod is welded into electrode, then described electrode is placed in vacuum arc melting furnace, through three meltings preparation
Obtain titan alloy casting ingot；
Step 2, titan alloy casting ingot described in step one is placed in 3150t hydraulic press, is 1100 DEG C～1200 DEG C in temperature
Under the conditions of carry out cogging forging, obtain forging stock；
Step 3, forging stock described in step 2 is placed in 1250t high-speed hydranlic press, under conditions of temperature is 850 DEG C～950 DEG C
Carry out pier and pull out forging, obtain forging, then described forging is placed in precise forging machine, under conditions of temperature is 750 DEG C～850 DEG C
Carry out radial forging, obtain semi-finished product titanium alloy rod bar；Infrared thermometer monitoring forging is adopted during described radial forging
Part surface temperature it is ensured that the excursion of radial forging temperature is in -10 DEG C～10 DEG C, the horizontal stroke of described semi-finished product titanium alloy rod bar
Section is circle, a diameter of 85mm～90mm of described cross section；
Step 4, semi-finished product titanium alloy rod bar described in step 3 are incubated under conditions of 750 DEG C～800 DEG C 30min～
60min carries out solution treatment, then cool to the furnace 500 DEG C～600 DEG C insulation 2h～8h carry out Ageing Treatment, be then air cooled to room
Temperature, obtains metastable beta-type titanium alloy bar.
2. according to a kind of high-strength metastable beta-type titanium alloy bar described in claim 1 it is characterised in that by following atom hundred
The one-tenth dividing ratio is grouped into: al 3%, v 5%, mo 5%, cr 4%, balance of ti and inevitable impurity.
3. according to a kind of high-strength metastable beta-type titanium alloy bar described in claim 1 it is characterised in that by following atom hundred
The one-tenth dividing ratio is grouped into: al 3%, v 5%, mo 5%, cr 5%, balance of ti and inevitable impurity.
4. according to a kind of high-strength metastable beta-type titanium alloy bar described in claim 1 it is characterised in that by following atom hundred
The one-tenth dividing ratio is grouped into: al 3%, v 5%, mo 5%, cr 6%, balance of ti and inevitable impurity.
5. the method for preparation high-strength metastable beta-type titanium alloy bar as described in any claim in Claims 1 to 4, it is special
Levy and be, comprise the following steps:
Step one, by 0 grade of titanium sponge, molybdenum powder, al-v intermediate alloy and chromium piece by design composition mix homogeneously after be pressed into electrode
Rod, multiple electrodes rod is welded into electrode, then described electrode is placed in vacuum arc melting furnace, through three meltings preparation
Obtain titan alloy casting ingot；
Step 2, titan alloy casting ingot described in step one is placed in 3150t hydraulic press, is 1100 DEG C～1200 DEG C in temperature
Under the conditions of carry out cogging forging, obtain forging stock；
Step 3, forging stock described in step 2 is placed in 1250t high-speed hydranlic press, under conditions of temperature is 850 DEG C～950 DEG C
Carry out pier and pull out forging, obtain forging, then described forging is placed in precise forging machine, under conditions of temperature is 750 DEG C～850 DEG C
Carry out radial forging, obtain semi-finished product titanium alloy rod bar；Infrared thermometer monitoring forging is adopted during described radial forging
Part surface temperature it is ensured that the excursion of radial forging temperature is in -10 DEG C～10 DEG C, the horizontal stroke of described semi-finished product titanium alloy rod bar
Section is circle, a diameter of 85mm～90mm of described cross section；
Step 4, semi-finished product titanium alloy rod bar described in step 3 are incubated under conditions of 750 DEG C～800 DEG C 30min～
60min carries out solution treatment, then cool to the furnace 500 DEG C～600 DEG C insulation 2h～8h carry out Ageing Treatment, be then air cooled to room
Temperature, obtains metastable beta-type titanium alloy bar.
6. in accordance with the method for claim 5 it is characterised in that the particle mean size of 0 grade of titanium sponge described in step one is little
In 13.0mm, the particle mean size of described chromium piece is not more than 2mm.
7. in accordance with the method for claim 5 it is characterised in that the quality purity of molybdenum powder described in step one and chromium piece all not
Less than 99.9%.
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| CN111647835B (en) * | 2020-06-01 | 2021-09-03 | 南京理工大学 | Method for improving mechanical heat treatment of beta-type titanium alloy |
| CN114525428B (en) * | 2020-11-03 | 2023-03-31 | 中国科学院金属研究所 | Titanium alloy system suitable for additive manufacturing process and part manufacturing process |
| CN112725713B (en) * | 2020-12-24 | 2021-12-28 | 长安大学 | High-strength and high-plasticity powder metallurgy titanium alloy and processing method thereof |
| CN113293325B (en) * | 2021-05-27 | 2022-05-06 | 西北有色金属研究院 | Preparation method of high-strength Ti185 alloy |
| CN116240478B (en) * | 2023-03-27 | 2024-05-10 | 西北工业大学 | Heat treatment method for improving strength of metastable beta titanium alloy to more than 1400MPa |
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