CN102477502A - Medical high-strength titanium alloy wire and preparation method thereof - Google Patents
Medical high-strength titanium alloy wire and preparation method thereof Download PDFInfo
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Abstract
The invention provides a medical high-strength titanium alloy wire and a preparation method thereof and relates to component control of a Ti-6Al-4V titanium alloy wire having high strength and good cold molding characteristic and a preparation method thereof. The component control of the Ti-6Al-4V titanium alloy wire is as follows: based on weight percent, 6.0%-6.3% of main element Al, 4.2%-4.5% of V, 0.13-0.15% of interstitial element O and 0.08%-0.12% of Fe. The alloy obtained according to the component control is subjected to smelting, cogging and forging, multiple heating numbers of upsetting and forging, large-deformation rolling, temperature-control hot drawing, stress relief annealing, electric heating straightening and grinding processes so as to prepare the high-strength titanium alloy wire. The Ti-6Al-4V titanium alloy can obtain high strength (tensile strength of more than or equal to 1200Mpa and elongation A of more than or equal to 8%) and excellent plasticity, and can be applied to a medical Kirschner wire fixing system.
Description
Technical field
The present invention relates to a kind of component with Ti-6Al-4V titanium alloy wire of HS, good cold-forming characteristic controls and preparation method thereof.
Background technology
Titanium or titanium alloy is because its excellent comprehensive performance is widely used in surgical implant in recent years.Wherein the Ti-6Al-4V titanium alloy has mechanical propertys such as HS, H.T., and excellent biology and mechanical compatibility, is the ideal implantation material for surgery.Its rod, sheet material; Be mainly used in surgical wound with Steel Plate For Fixation Of Fracture and set screw, this is fixing very effective for sclerite, but short and small fracture or the little fracture fixation of avulsion fracture equal stress; The general Kirschner wire that adopts filament to make substitutes Steel Plate For Fixation Of Fracture and set screw; Kirschner wire is the bone fixation folded block effectively, and simple to operate, and the clinical operation wound is little.(diameter range 0.8～2.5mm) fixed system requires material to have HS (Rm >=1200MPa) to Kirschner wire; Thereby in secular military service process, be not shifted phenomenon after effectively guaranteeing to fix; Plasticity also will reach more than 8% simultaneously; To obtain good curved characteristic, satisfy needle point head-bent cold-forming requirement, play the fixedly effect of fracture site of effective connection.The tradition Kirschner wire adopts 00Crl8Nil4Mo3 cold working attitude Stainless Steel Wire, and intensity is very high, but does not almost have plasticity, and processing such as head bending or operation can cause tangible cracking phenomena in the time of fixedly.Obtain high-intensity Ti-6Al-4V titanium alloy and can adopt solid solution aging to handle, but the titanium alloy plasticity after handling is relatively poor, therefore, should improve, obtain to satisfy the mechanical property of request for utilization from material composition control and complete processing.
Summary of the invention
The present invention's's " a kind of medical high-strength degree titanium alloy wire and preparation method thereof " purpose provides a kind of Ti-6Al-4V titanium alloy wire materials and this preparation methods; The extremely low problem of plasticity when the solution material satisfies HS; This material not only has HS, and cold-forming characteristic good under the room temperature.
The technical scheme that the present invention adopted; The Ti-6Al-4V titanium alloy; Principal element Al content range 6.0%～6.3% by weight percentage, V content range 4.2%～4.5%, emphasis are the reasonable regulation and control of interstitial element O and Fe; O content range 0.13%～0.15%, Fe content range 0.08%～0.12%.Prepare the silk method that material adopted of this component, may further comprise the steps:
1) melting
Select 0 grade or 1 grade of Titanium Sponge 40-60 mesh; At first Titanium Sponge 40-60 mesh, aluminum-vanadium alloy, aluminium shot or aluminium foil are disposed by a certain percentage and be mixed into alloy material; Use oil press to be pressed into electrode block, re-use the vacuum consumable arc-melting stove and prepare diameter of phi 460mm ingot casting through three meltings;
2) forge
Adopt gas furnace to carry out cogging and forge (Φ 460 → 220), 1050 ℃～1150 ℃ of Heating temperatures; Forge (220 → Φ 160 → 70) in the middle of the many fire of two-phase region time, 940 ℃～970 ℃ of Heating temperatures, and adopt the mode of switching-over upsetting pull; To improve the passing through property of forging of forging process interalloy; Final forging temperature is lower slightly than normal temps, and about 800 ℃, so that the structure refinement of follow-up rolling deformation;
3) rolling
The gross distortion operation of rolling (70 → Φ 8) adopts the electric furnace heating, 900 ℃～910 ℃ of Heating temperatures, and temperature-controlled precision requires to reach ± 5 ℃, is heated to warm soaking time 20min～30min, finishing temperature ≮ 800 ℃;
4) temperature control hot pull
With Φ 8 rolling blanks after figuring of surface is handled; Carry out pre-oxidation treatment, 790 ℃～810 ℃/15～20min of oxidation then carries out the temperature control hot pull of multi-pass; Prepare the drawing silk material of different size; Adopt the casement drawing, the hot pull heating is carried out in box-type furnace, and it is constant that every time drawing speed keeps.
Coiling behind the hot pull is prepared into 0.8mm～2.5mm Ti-6Al-4V titanium alloy wire after a material passes through operations such as a stress relief annealing processing, electric heating aligning, grinding.Stress relief annealing adopts 700 ℃～750 ℃/1～1.5h.
The temperature control hot pull is a critical process in the preparation process of material involved in the present invention.Concrete hot-pull technique system is following:
The invention has the advantages that: through the control of alloy composition, mainly be the control of interstitial element O, Fe, gross distortion forging rolling, temperature control hot pull, and follow-up stress relief annealing, material is obtaining the high-intensity while, and plasticity is good; And drawing process does not have loss, and stock removal is little, and yield rate is high, thereby has reduced tooling cost.
Description of drawings
Accompanying drawing is the processing and preparing schema of this Type Titanium Alloy.
Embodiment
In conjunction with accompanying drawing and specific embodiment the present invention is elaborated.
Medical high-strength degree titanium alloy wire of the present invention is realized through step shown in the drawings, may further comprise the steps:
1) melting
Select 0 grade or 1 grade of Titanium Sponge 40-60 mesh; At first Titanium Sponge 40-60 mesh, aluminum-vanadium alloy, aluminium shot or aluminium foil are disposed by a certain percentage and be mixed into alloy material; Use oil press to be pressed into electrode block, re-use the vacuum consumable arc-melting stove and be smelted into through three times and prepare diameter of phi 460mm ingot casting;
2) forge
Adopt gas furnace to carry out cogging and forge (Φ 460 → 220), 1050 ℃～1150 ℃ of Heating temperatures; Forge (220 → Φ 160 → 70) in the middle of the many fire of two-phase region time, 940 ℃～970 ℃ of Heating temperatures, and adopt the mode of switching-over upsetting pull; To improve the passing through property of forging of forging process interalloy; Final forging temperature is lower slightly than normal temps, and about 800 ℃, so that the structure refinement of follow-up rolling deformation;
3) rolling
The gross distortion operation of rolling (70 → Φ 8) adopts the electric furnace heating, 900 ℃～910 ℃ of Heating temperatures, and temperature-controlled precision requires to reach ± 5 ℃, is heated to warm soaking time 20min～30min, finishing temperature ≮ 800 ℃;
4) temperature control hot pull
With Φ 8 rolling blanks after figuring of surface is handled; Carry out pre-oxidation treatment, 790 ℃～810 ℃/15～20min of oxidation then carries out the temperature control hot pull of multi-pass; Prepare the drawing silk material of different size; Adopt the casement drawing, the hot pull heating is carried out in box-type furnace, and it is constant that every time drawing speed keeps.
Coiling behind the hot pull is prepared into 0.8mm～2.5mm Ti-6Al-4V titanium alloy wire after a material passes through operations such as a stress relief annealing processing, electric heating aligning, grinding.Stress relief annealing adopts 700 ℃～750 ℃/1～1.5h.
Embodiment 1:
Adopting 1 grade of Titanium Sponge 40-60 mesh, aluminium vanadium 85 and aluminium shot is raw material, and Ti-6Al-4V composition (weight percent wt%) carries out proportioning by Al 6.2%, V 4.1%, behind batch mixing, is pressed into electrode block; Again electrode block is welded into melting with plasma welding method and uses electrode; In the vacuum consumable arc-melting stove, carry out being smelted into ingot casting three times, the weight percent of three ingot main alloying elements of titanium alloy and oxygen, iron is: Al 6.1%, and V 4.2%; O 0.13%, and Fe 0.08%.Use water pressure engine or air hammer that ingot casting is carried out cogging at 1050～1150 ℃ and forge into 220mm upsetting pull forging stock, and after a fire time upsetting pull, become the pole base of Φ 160mm.Carry out the footpath at 950 ℃ then and be swaged into square billet into 70mm.Through second-heating, Heating temperature is 900 ℃, carries out temperature-controlled rolling behind the square billet sharpening, and the operation of rolling is avoided temperature rise through installing refrigerating unit additional, guarantees the temperature substantially constant of material, is rolled into Φ 8mm kicker; Again with the rolling blank of Φ 8mm after figuring of surface is handled, carry out pre-oxidation treatment, 800 ℃/15min of oxidation; Then carry out the temperature control hot pull of multi-pass, prepare the drawing silk material of different size, adopt the casement drawing; The hot pull heating is carried out in box-type furnace, and it is constant that every time drawing speed keeps.The drawing process parameter is following:
Coiling behind the hot pull is prepared into Φ 2.0mmTi-6Al-4V titanium alloy wire after a material passes through operations such as a stress relief annealing processing, electric heating aligning, grinding.Stress relief annealing adopts 700 ℃/1.5h.
The mechanical property characteristic of this Ti-6Al-4V titanium alloy wire is following:
Embodiment 2:
Adopting 1 grade of Titanium Sponge 40-60 mesh, aluminium vanadium 85 and aluminium shot is raw material, and Ti-6Al-4V composition (weight percent wt%) carries out proportioning by Al 6.2%, V 4.5%, behind batch mixing, is pressed into electrode block; Again electrode block is welded into melting with plasma welding method and uses electrode; In the vacuum consumable arc-melting stove, carry out being smelted into ingot casting three times, the weight percent of three ingot main alloying elements of titanium alloy and oxygen, iron is: Al 6.3%, and V 4.5%; O 0.15%, and Fe 0.10%.Use water pressure engine or air hammer that ingot casting is carried out cogging at 1050～1150 ℃ and forge into 220mm upsetting pull forging stock, and after two fire time upsetting pulls, become the pole base of Φ 160mm.Carry out the footpath at 950 ℃ then and be swaged into square billet into 70mm.Through second-heating, Heating temperature is 890 ℃, carries out temperature-controlled rolling behind the square billet sharpening, and the operation of rolling is avoided temperature rise through installing refrigerating unit additional, guarantees the temperature substantially constant of material, is rolled into Φ 8mm kicker; Again with the rolling blank of Φ 8mm after figuring of surface is handled, carry out pre-oxidation treatment, 800 ℃/15min of oxidation; Then carry out the temperature control hot pull of multi-pass, prepare the drawing silk material of different size, adopt the casement drawing; The hot pull heating is carried out in box-type furnace, and it is constant that every time drawing speed keeps.
It is constant that every time drawing speed keeps.The drawing process parameter is following:
Coiling behind the hot pull is prepared into Φ 1.0mmTi-6Al-4V titanium alloy wire after a material passes through operations such as a stress relief annealing processing, electric heating aligning, grinding.Stress relief annealing adopts 750 ℃/1.5h.
The mechanical property characteristic of this Ti-6Al-4V titanium alloy wire is following:
Claims (4)
1. the Composition Control of a Ti-6Al-4V titanium alloy (weight percent): principal element Al content range 6.0%～6.3%, V content range 4.2%～4.5%; Interstitial element O content range 0.13%～0.15%, Fe content range 0.08%～0.12%.
2. according to the Ti-6Al-4V titanium alloy of the said Composition Control of claim 1, need through melting, cogging forge, many fire time upsetting pull forgings, gross distortion are rolling, temperature control hot pull, stress relief annealing, electric heating aligning and grinding process are prepared high strength titanium alloy silk material.
3. the critical process temperature control hot pull of preparation process is carried out by following processing parameter in the claim 2:
4. according to claim 1,2,3 said Composition Control, preparation flow and processing parameter requirement; This Ti-6Al-4V titanium alloy can obtain the HS of tensile strength Rm >=1200Mpa, unit elongation A >=8% and good plasticity, can be applicable to medical Kirschner wire fixed system.
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| CN102888532A (en) * | 2012-07-13 | 2013-01-23 | 中国科学院金属研究所 | Alpha and beta combined titanium alloy wire for electron beam fused deposition rapid formed structural member with strength level of 920 MPa |
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| CN104962779A (en) * | 2015-07-31 | 2015-10-07 | 创生医疗器械（中国）有限公司 | Ti6Al4V alloy and orthopaedic implant prepared from alloy |
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Application publication date: 20120530 |