CN104878245B - Biomedical high-strength and toughness Ti-6Al-4V titanium alloy bar and preparation method thereof - Google Patents
Biomedical high-strength and toughness Ti-6Al-4V titanium alloy bar and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a biomedical high-strength and toughness Ti-6Al-4V titanium alloy bar which is prepared from the following elements in percentage by mass: 6.0%-6.3% of Al, 4.0%-4.3% of V, 0.16%-0.18% of O, 0.18%-0.25% of Fe and 88.97%-89.66% of Ti, wherein the sum of the content of the elements is 100%. The prepared bar has the characteristics of high hardness, high toughness and high strength, can be widely applied to a medical spinal jackscrew fixing system. The invention further discloses a preparation method of the bar. The method comprises the following steps: preparing a cast ingot, forging, drawing into a square billet, and rolling into the bar; and carrying out heat treatment and finish machining. Massive production of the titanium alloy bar which is high in strength and toughness and relatively good in mechanical property consistency can be realized; and the production efficiency of the high-toughness titanium alloy bar is effectively improved.
Description
Technical field
The invention belongs to technical field of metal material preparation, is related to a kind of bio-medical high-strength tenacity Ti-6Al-4V titaniums and closes
Golden bar, the invention further relates to the preparation method of above-mentioned titanium alloy rod bar.
Background technology
Titanium or titanium alloy has excellent elastic modelling quantity, also, with close with skeleton, corrosion resistant feature, its
It is biological excellent with mechanical compatibility, it is particularly suitable for making medical surgery implant, in being widely used in orthopedic operation.Titanium
Alloy implants usually as stress device, such as spinal column jackscrew, screw, nail etc., and wherein Ti-6Al-4V titanium alloys are due to tool
There is the excellent mechanical performance such as high intensity, high tenacity, be a kind of preferable implantation material for surgery.Due to spinal column jackscrew (diameter
10～10.5mm of scope) fixed system uses cooperatively with U-shaped nail, Orthopedic rod, needs to be screwed in U-type groove during operation, operating process
In be subject to larger distorting stress, it is necessary to using possessing high-strength (Rm >=1000MPa), high hard (Hardness >=310HV), high-ductility
Property the mechanical property such as (A >=15%) material, so as to be effectively ensured it is fixed after be not shifted over during long-term military service it is existing
As playing a part of effectively connection and spinal fixation.But at present, mould under the Ti-6Al-4V titanium alloy high intensity that China produces
Property low and hardness it is low, there is no producing with high-strength tenacity and the preferable product of mechanical property concordance for method mass.
The content of the invention
It is an object of the invention to provide a kind of bio-medical high-strength tenacity Ti-6Al-4V titanium alloy rod bars, solve existing
Plasticity is low under Ti-6Al-4V titanium alloy high intensity and the low problem of hardness.
It is a further object of the present invention to provide the preparation method of high-strength tenacity Ti-6Al-4V titanium alloy rod bars, so as to make
It is standby go out with high-strength tenacity and the preferable titanium alloy product of mechanical property concordance.
The technical solution adopted in the present invention is,
A kind of bio-medical high-strength tenacity Ti-6Al-4V titanium alloy rod bars, by mass percentage by following elementary composition：Al
6.0%～6.3%, V 4.0%～4.3%, O 0.16%～0.18%, Fe 0.18%～0.25%, Ti 88.97%～
89.66%, the content sum of above element is for absolutely.
Another technical scheme of the present invention is, the preparation side of above-mentioned high-strength tenacity Ti-6Al-4V titanium alloy rod bars
Method, specifically implements according to following steps：
Step 1：Prepare ingot casting：Using titanium sponge, aluminum-vanadium alloy, aluminium shot as raw material, according to each element content range：Al
6.0%～6.3%, V 4.0%～4.3%, O 0.16%～0.18%, Fe 0.18%～0.25%, Ti 88.97%～
89.66% carries out burdening calculation, and weighs mixing after above-mentioned raw materials respectively, is then pressed into electrode block using hydraulic press, then makes
With tri- meltings of vacuum consumable arc-melting stove Jing, ingot casting is obtained；
Step 2：Forging, pulling are square billet：Ingot casting obtained in Jing steps 1 is carried out into cogging forging and pulling using gas furnace
Operation, is obtained square billet；
Step 3：Roll as bar：Square billet obtained in Jing steps 2 is carried out into two fire time large deformation rollings, bar is obtained；
Step 4：Heat treatment：Bar obtained in Jing steps 3 is carried out into stress annealing process, annealing temperature is 650～750
DEG C, annealing time is 1～2h；
Step 5：Polish：Bar Jing after step 4 is processed is first passed through into two roller thermal straightening operations to process, wherein, heating
Temperature is 500～750 DEG C, and temperature retention time is 8～10min；Then Jing ground working procedure processing to dimensional tolerance is H9～H7,
Finally it is processed by shot blasting using buffing machine, till being polished to Surface of Rod Bar light, high-strength tenacity Ti-6Al-4V titanium alloys is obtained
Bar.
The characteristics of another technical scheme of the invention, also resides in,
Step 2 is concretely comprised the following steps：Pulled out using many fire time commutation piers, heating-up temperature is 1050～1150 DEG C, temperature retention time
For 200～240min, ingot diameters are made to be kept to 200～220mm；Then the pulling operation of a fire time, heating-up temperature 1000 are carried out
～1050 DEG C, 900～950 DEG C of final forging temperature, temperature retention time 200min.
Step 3 is concretely comprised the following steps：First fire time large deformation rolls and is：Using heating by electric cooker, heating-up temperature 930～950
DEG C, temperature retention time 80min, finishing temperature is 800～850 DEG C, makes square billet diameter be kept to 50mm；Second fire time large deformation rolling
For：Using heating by electric cooker, 890～910 DEG C of heating-up temperature, temperature retention time 60min, 750～800 DEG C of finishing temperature.
Obtained high-strength tenacity Ti-6Al-4V titanium alloy rod bars, wherein Al content are 6.0%～6.3%, and V content is
4.0%～4.3%, O content be 0.16%～0.18%, Fe contents be 0.18%～0.25%, Ti contents be 88.97%～
89.66%.
Obtained high-strength tenacity Ti-6Al-4V titanium alloy rod bars, tensile strength is not less than not less than 1000Mpa, elongation percentage
15%, hardness is not less than 310HV.
The invention has the beneficial effects as follows：
A kind of bio-medical high-strength tenacity Ti-6Al-4V titanium alloy rod bars, by each key element of strict control ingot casting
The composition range of Al, V, Fe, O, the characteristics of make obtained bar have high rigidity, high tenacity and high intensity, can extensively apply
In medical spinal column jackscrew fixed system；
A kind of preparation method of bio-medical high-strength tenacity Ti-6Al-4V titanium alloy rod bars：By prepare ingot casting, forging,
It is square billet, heat treatment and finishing step to pull out as square billet, forging, pulling, can realize mass production high-strength tenacity and power
The preferable titanium alloy rod bar of consistency of performance is learned, the production efficiency of high-tenacity titanium alloy bar is effectively increased.
Specific embodiment
A kind of preparation method of bio-medical high-strength tenacity Ti-6Al-4V titanium alloy rod bars of the present invention, specific implementation step
It is as follows：
Step 1：Prepare ingot casting：Titanium sponge, aluminum-vanadium alloy, aluminium shot are pressed as raw material, according to each element content range：Al
6.0%～6.3%, V 4.0%～4.3%, O 0.16%～0.18%, Fe 0.18%～0.25%, Ti 88.97%～
89.66% carries out burdening calculation, and weighs mixing after above-mentioned raw materials respectively, is then pressed into electrode block using 3500t hydraulic presses,
Reuse tri- meltings of vacuum consumable arc-melting stove Jing and prepare a diameter of 460mm ingot castings, ingot casting is obtained；
Step 2：Forging, pulling are square billet：Ingot casting obtained in Jing steps 1 is carried out into cogging forging and pulling using gas furnace
Operation, is pulled out using many fire time commutation piers, and heating-up temperature is 1050～1150 DEG C, and temperature retention time is 200～240min, makes ingot casting straight
Footpath is kept to 200～220mm；Then carry out one fire time pulling operation, 1000～1050 DEG C of heating-up temperature, final forging temperature 900～
950 DEG C, temperature retention time 200min is obtained the square billet of a diameter of 120mm；
Step 3：Roll as bar：Square billet obtained in Jing steps 2 is carried out into two fire time large deformation rollings, the first fire time is big to be become
Shape is rolled：Using heating by electric cooker, 930～950 DEG C of heating-up temperature, temperature retention time 80min, finishing temperature is 800～850 DEG C,
Square billet diameter is set to be kept to 50mm；Second fire time large deformation rolls and is：Using heating by electric cooker, 890～910 DEG C of heating-up temperature, insulation
Time 60min, 750～800 DEG C of finishing temperature is obtained the bar of a diameter of 11.5mm；
Step 4：Heat treatment：Bar obtained in Jing steps 3 is carried out into stress annealing process, annealing temperature is 650～750
DEG C, annealing time is 1～2h；
Step 5：Polish：Bar Jing after step 4 is processed is first passed through into two roller thermal straightening operations to process, wherein, heating
Temperature is 500～750 DEG C, and temperature retention time is 8～10min；Then Jing ground working procedure processing to dimensional tolerance is H9～H7,
Finally it is processed by shot blasting using buffing machine, till being polished to Surface of Rod Bar light, high-strength tenacity Ti-6Al-4V titanium alloys is obtained
Bar, wherein Al content is 6.0%～6.3%, and V content is 4.0%～4.3%, and O content contains for 0.16%～0.18%, Fe
It is 88.97%～89.66% to measure as 0.18%～0.25%, Ti contents, and tensile strength is not little not less than 1000Mpa, elongation percentage
In 15%, hardness is not less than 310HV.
Embodiment 1
Prepare ingot casting：Prepare ingot casting：Titanium sponge, aluminum-vanadium alloy, aluminium shot are pressed as raw material, according to each element content model
Enclose：Al 6.0%, V 4.0%, O 0.16%, Fe 0.18%, Ti 88.97% carries out burdening calculation, and weighs respectively above-mentioned
Mix after raw material, then electrode block is pressed into using 3500t hydraulic presses, reuse tri- meltings of vacuum consumable arc-melting stove Jing
A diameter of 460mm ingot castings are prepared, ingot casting is obtained；Obtained ingot casting is carried out into cogging forging and pulling operation using gas furnace,
Pulled out using many fire time commutation piers, heating-up temperature is 1050 DEG C, and temperature retention time is 200min, makes ingot diameters be kept to 200mm；Then
The pulling operation of a fire time is carried out, 1000 DEG C of heating-up temperature, 900 DEG C of final forging temperature, temperature retention time 200min is obtained a diameter of
The square billet of 120mm；Obtained square billet is carried out into two fire time large deformation rollings, the first fire time large deformation rolling is：Using electric furnace plus
Heat, 930 DEG C of heating-up temperature, temperature retention time 80min, finishing temperature is 800 DEG C, makes square billet diameter be kept to 50mm；Second fire time is big
Deforming rolling is：Using heating by electric cooker, 890 DEG C of heating-up temperature, temperature retention time 60min, 750 DEG C of finishing temperature, it is obtained a diameter of
11.5mm bar；Obtained bar is carried out into stress annealing process, annealing temperature is 650 DEG C, and annealing time is 1h；To process
Bar afterwards first passes through the process of two roller thermal straightening operations, wherein, heating-up temperature is 500 DEG C, and temperature retention time is 8min；Then Jing grinds
It is H9 to cut treatment process and be machined to dimensional tolerance, is finally processed by shot blasting using buffing machine, and being polished to Surface of Rod Bar light is
Only, high-strength tenacity Ti-6Al-4V titanium alloy rod bars are obtained, wherein Al content is 6.0%, and V content is 4.0%, and O content is
It is 89.66% that 0.16%, Fe content is 0.18%, Ti contents, tensile strength 1000Mpa, elongation percentage 15%, hardness 310HV.
Embodiment 2
Prepare ingot casting：Prepare ingot casting：Titanium sponge, aluminum-vanadium alloy, aluminium shot are pressed as raw material, according to each element content model
Enclose：Al 6.2%, V 4.2%, O 0.17%, Fe 0.22%, Ti 89.21% carries out burdening calculation, and weighs respectively above-mentioned
Mix after raw material, then electrode block is pressed into using 3500t hydraulic presses, reuse tri- meltings of vacuum consumable arc-melting stove Jing
A diameter of 460mm ingot castings are prepared, ingot casting is obtained；Obtained ingot casting is carried out into cogging forging and pulling operation using gas furnace,
Pulled out using many fire time commutation piers, heating-up temperature is 1100 DEG C, and temperature retention time is 220min, makes ingot diameters be kept to 210mm；Then
The pulling operation of a fire time is carried out, 1025 DEG C of heating-up temperature, 925 DEG C of final forging temperature, temperature retention time 200min is obtained a diameter of
The square billet of 120mm；Obtained square billet is carried out into two fire time large deformation rollings, the first fire time large deformation rolling is：Using electric furnace plus
Heat, 940 DEG C of heating-up temperature, temperature retention time 80min, finishing temperature is 825 DEG C, makes square billet diameter be kept to 50mm；Second fire time is big
Deforming rolling is：Using heating by electric cooker, 900 DEG C of heating-up temperature, temperature retention time 60min, 780 DEG C of finishing temperature, it is obtained a diameter of
11.5mm bar；Obtained bar is carried out into stress annealing process, annealing temperature is 700 DEG C, and annealing time is 1.5h；Will place
Bar after reason first passes through the process of two roller thermal straightening operations, wherein, heating-up temperature is 650 DEG C, and temperature retention time is 9min；Then Jing
Ground working procedure processing to dimensional tolerance is H8, is finally processed by shot blasting using buffing machine, is polished to Surface of Rod Bar light
Till, high-strength tenacity Ti-6Al-4V titanium alloy rod bars are obtained, wherein Al content is 6.2%, and V content is 4.2%, and O content is
It is 89.21% that 0.17%, Fe content is 0.22%, Ti contents, and tensile strength is not less than 16% not less than 1100Mpa, elongation percentage,
Hardness is not less than 320HV.
Embodiment 3
Prepare ingot casting：Prepare ingot casting：Titanium sponge, aluminum-vanadium alloy, aluminium shot are pressed as raw material, according to each element content model
Enclose：Al 6.3%, V 4.3%, O 0.18%, Fe 0.25%, Ti 88.97% carries out burdening calculation, and weighs respectively above-mentioned
Mix after raw material, then electrode block is pressed into using 3500t hydraulic presses, reuse tri- meltings of vacuum consumable arc-melting stove Jing
A diameter of 460mm ingot castings are prepared, ingot casting is obtained；Obtained ingot casting is carried out into cogging forging and pulling operation using gas furnace,
Pulled out using many fire time commutation piers, heating-up temperature is 1150 DEG C, and temperature retention time is 240min, makes ingot diameters be kept to 220mm；Then
The pulling operation of a fire time is carried out, 1050 DEG C of heating-up temperature, 950 DEG C of final forging temperature, temperature retention time 200min is obtained a diameter of
The square billet of 120mm；Obtained square billet is carried out into two fire time large deformation rollings, the first fire time large deformation rolling is：Using electric furnace plus
Heat, 950 DEG C of heating-up temperature, temperature retention time 80min, finishing temperature is 850 DEG C, makes square billet diameter be kept to 50mm；Second fire time is big
Deforming rolling is：Using heating by electric cooker, 910 DEG C of heating-up temperature, temperature retention time 60min, 800 DEG C of finishing temperature, it is obtained a diameter of
11.5mm bar；Obtained bar is carried out into stress annealing process, annealing temperature is 750 DEG C, and annealing time is 2h；To process
Bar afterwards first passes through the process of two roller thermal straightening operations, wherein, heating-up temperature is 750 DEG C, and temperature retention time is 10min；Then Jing
Ground working procedure processing to dimensional tolerance is H7, is finally processed by shot blasting using buffing machine, is polished to Surface of Rod Bar light
Till, high-strength tenacity Ti-6Al-4V titanium alloy rod bars are obtained, wherein Al content is 6.3%, and V content is 4.3%, and O content is
It is 89.97% that 0.18%, Fe content is 0.25%, Ti contents, and tensile strength is not less than 17% not less than 1200Mpa, elongation percentage,
Hardness is not less than 330HV.
Claims (4)
1. a kind of preparation method of bio-medical high-strength tenacity Ti-6Al-4V titanium alloy rod bars, it is characterised in that specifically according to
Lower step is implemented：
Step 1：Prepare ingot casting：Using titanium sponge, aluminum-vanadium alloy, aluminium shot as raw material, according to each element content range：Al 6.0%
～6.3%, V 4.0%～4.3%, O 0.16%～0.18%, Fe 0.18%～0.25%, Ti 88.97%～89.66%
Burdening calculation is carried out, and weighs mixing after above-mentioned raw materials respectively, then electrode block is pressed into using hydraulic press, reuse vacuum certainly
Consumption arc-melting furnace tri- meltings of Jing, are obtained ingot casting；
Step 2：Forging, pulling are square billet：Ingot casting obtained in Jing steps 1 is carried out into cogging forging and pulling work using gas furnace
Sequence, is obtained square billet, specially：To be pulled out using many fire time commutation piers, heating-up temperature is 1050～1150 DEG C, temperature retention time is 200～
240min, makes ingot diameters be kept to 200～220mm；Then the pulling operation of a fire time, heating-up temperature 1000～1050 are carried out
DEG C, 900～950 DEG C of final forging temperature, temperature retention time 200min；
Step 3：Roll as bar：Square billet obtained in Jing steps 2 is carried out into two fire time large deformation rollings, bar is obtained；
Step 4：Heat treatment：Bar obtained in Jing steps 3 is carried out into stress annealing process, annealing temperature is 650～750 DEG C, is moved back
The fiery time is 1～2h；
Step 5：Polish：Bar Jing after step 4 is processed is first passed through into two roller thermal straightening operations to process, wherein, heating-up temperature
For 500～750 DEG C, temperature retention time is 8～10min；Then Jing ground working procedure processing to dimensional tolerance is H9～H7, finally
It is processed by shot blasting using buffing machine, till being polished to Surface of Rod Bar light, high-strength tenacity Ti-6Al-4V titanium alloy bars is obtained
Material.
2. the preparation method of a kind of bio-medical high-strength tenacity Ti-6Al-4V titanium alloy rod bars according to claim 1,
Characterized in that, the step 3 is concretely comprised the following steps：First fire time large deformation rolls and is：Using heating by electric cooker, heating-up temperature
930～950 DEG C, temperature retention time 80min, finishing temperature is 800～850 DEG C, makes square billet diameter be kept to 50mm；Second fire time is big to be become
Shape is rolled：Using heating by electric cooker, 890～910 DEG C of heating-up temperature, temperature retention time 60min, 750～800 DEG C of finishing temperature.
3. the preparation method of a kind of bio-medical high-strength tenacity Ti-6Al-4V titanium alloy rod bars according to claim 1, its
It is characterised by, obtained high-strength tenacity Ti-6Al-4V titanium alloy rod bars, wherein Al content are 6.0%～6.3%, V content is
4.0%～4.3%, O content be 0.16%～0.18%, Fe contents be 0.18%～0.25%, Ti contents be 88.97%～
89.66%.
4. the preparation method of a kind of bio-medical high-strength tenacity Ti-6Al-4V titanium alloy rod bars according to claim 1, its
It is characterised by, obtained high-strength tenacity Ti-6Al-4V titanium alloy rod bars, tensile strength is not less than not less than 1000MPa, elongation percentage
15%, hardness is not less than 310HV.
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