CN104878245A - 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, relate to a kind of bio-medical high-strong toughness Ti-6Al-4V titanium alloy rod bar, the invention still further relates to the preparation method of above-mentioned titanium alloy rod bar.
Background technology
Titanium or titanium alloy has excellent Young's modulus, and have close with skeleton, corrosion resistant feature, it is biological excellent with mechanical compatibility, is particularly suitable for making medical surgery implant, is widely used in orthopedic operation.Titanium alloy implants usually used as stressed device, and as backbone jackscrew, screw, nail etc., wherein Ti-6Al-4V titanium alloy is owing to having the excellent mechanical property such as high strength, high tenacity, is a kind of desirable implantation material for surgery.Due to backbone jackscrew (diameter range 10 ~ 10.5mm) fixed system and U-shaped nail, Orthopedic rod with the use of, need during operation to be screwed in U-type groove, larger torsional stress is subject in operating process, the material possessing high-strength (Rm >=1000MPa), the high hard mechanical property such as (Hardness >=310HV), high tenacity (A >=15%) must be adopted, thus effectively guarantee shifting phenomena does not occur after fixing in long-term military service process, play the effect of effectively connection and spinal fixation.But at present, under the Ti-6Al-4V titanium alloy high strength that China produces, plasticity is low low with hardness, there is no producing of method mass and has high-strong toughness and the good product of mechanical property consistence.
Summary of the invention
The object of this invention is to provide a kind of bio-medical high-strong toughness Ti-6Al-4V titanium alloy rod bar, solve the problem that under existing Ti-6Al-4V titanium alloy high strength, plasticity is low and hardness is low.
Another object of the present invention is to provide the preparation method of this high-strong toughness Ti-6Al-4V titanium alloy rod bar, thus prepares and have high-strong toughness and the good titanium alloy product of mechanical property consistence.
The technical solution adopted in the present invention is,
A kind of bio-medical high-strong toughness Ti-6Al-4V titanium alloy rod bar, 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 absolutely.
Another technical scheme of the present invention is, the preparation method of above-mentioned high-strong toughness Ti-6Al-4V titanium alloy rod bar, 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 charge calculation, and mix after taking above-mentioned raw materials respectively, then adopt oil press to be pressed into electrode block, re-use vacuum consumable arc-melting stove through three meltings, obtained ingot casting;
Step 2: forging, pulling are square billet: adopted by the ingot casting obtained through step 1 gas furnace to carry out cogging forging and pulling operation, obtained square billet;
Step 3: rolling is bar: the square billet obtained through step 2 is carried out two fire time gross distortion rollings, obtained bar;
Step 4: thermal treatment: the bar obtained through step 3 is carried out stress annealing process, and annealing temperature is 650 ~ 750 DEG C, and annealing time is 1 ~ 2h;
Step 5: precision work: by the bar after processing through step 4 first through two roller hot straightening operation process, wherein, Heating temperature is 500 ~ 750 DEG C, and soaking time is 8 ~ 10min; Then being machined to tolerance of dimension through ground operation is H9 ~ H7, finally adopts polishing machine to carry out polished finish, till being polished to Surface of Rod Bar light, and obtained high-strong toughness Ti-6Al-4V titanium alloy rod bar.
The feature of another technical scheme of the present invention is also,
The concrete steps of step 2 are: adopt many fire time commutation piers to pull out, Heating temperature is 1050 ~ 1150 DEG C, and soaking time is 200 ~ 240min, makes ingot diameters be kept to 200 ~ 220mm; Then the pulling operation that a fire is secondary is carried out, Heating temperature 1000 ~ 1050 DEG C, final forging temperature 900 ~ 950 DEG C, soaking time 200min.
The concrete steps of step 3 are: the first fire time gross distortion rolling is: adopt heating by electric cooker, Heating temperature 930 ~ 950 DEG C, soaking time 80min, finishing temperature is 800 ~ 850 DEG C, makes square billet diameter be kept to 50mm; Second fire time gross distortion rolling is: adopt heating by electric cooker, Heating temperature 890 ~ 910 DEG C, soaking time 60min, finishing temperature 750 ~ 800 DEG C.
Obtained high-strong toughness Ti-6Al-4V titanium alloy rod bar, wherein Al content is 6.0% ~ 6.3%, V content be 4.0% ~ 4.3%, O content be 0.16% ~ 0.18%, Fe content be 0.18% ~ 0.25%, Ti content is 88.97% ~ 89.66%.
Obtained high-strong toughness Ti-6Al-4V titanium alloy rod bar, tensile strength is not less than 1000Mpa, unit elongation is not less than 15%, and hardness is not less than 310HV.
The invention has the beneficial effects as follows:
A kind of bio-medical high-strong toughness Ti-6Al-4V titanium alloy rod bar, by strictly controlling the composition range of each key element Al, V, Fe, O of ingot casting, make the bar obtained have the feature of high rigidity, high tenacity and high strength, medical backbone jackscrew fixed system can be widely used in;
A kind of preparation method of bio-medical high-strong toughness Ti-6Al-4V titanium alloy rod bar: by preparing ingot casting, forging, pulling be square billet, forging, pulling are square billet, thermal treatment and finishing step, mass production high-strong toughness can be realized and the good titanium alloy rod bar of mechanical property consistence, effectively improve the production efficiency of high-tenacity titanium alloy bar.
Embodiment
The preparation method of a kind of bio-medical high-strong toughness of the present invention Ti-6Al-4V titanium alloy rod bar, concrete implementation step 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 charge calculation, and mix after taking above-mentioned raw materials respectively, then adopt 3500t oil press to be pressed into electrode block, re-using vacuum consumable arc-melting stove, to prepare diameter through three meltings be 460mm ingot casting, obtained ingot casting;
Step 2: forging, pulling are square billet: adopted by the ingot casting obtained through step 1 gas furnace to carry out cogging forging and pulling operation, many fire time commutation piers are adopted to pull out, Heating temperature is 1050 ~ 1150 DEG C, and soaking time is 200 ~ 240min, makes ingot diameters be kept to 200 ~ 220mm; Then carry out the pulling operation that a fire is secondary, Heating temperature 1000 ~ 1050 DEG C, final forging temperature 900 ~ 950 DEG C, soaking time 200min, obtained diameter is the square billet of 120mm;
Step 3: rolling is bar: the square billet obtained through step 2 is carried out two fire time gross distortion rollings, first fire time gross distortion rolling is: adopt heating by electric cooker, Heating temperature 930 ~ 950 DEG C, soaking time 80min, finishing temperature is 800 ~ 850 DEG C, makes square billet diameter be kept to 50mm; Second fire time gross distortion rolling is: adopt heating by electric cooker, Heating temperature 890 ~ 910 DEG C, soaking time 60min, finishing temperature 750 ~ 800 DEG C, obtained diameter is the bar of 11.5mm;
Step 4: thermal treatment: the bar obtained through step 3 is carried out stress annealing process, and annealing temperature is 650 ~ 750 DEG C, and annealing time is 1 ~ 2h;
Step 5: precision work: by the bar after processing through step 4 first through two roller hot straightening operation process, wherein, Heating temperature is 500 ~ 750 DEG C, and soaking time is 8 ~ 10min; Then being machined to tolerance of dimension through ground operation is H9 ~ H7, polishing machine is finally adopted to carry out polished finish, till being polished to Surface of Rod Bar light, obtained high-strong toughness Ti-6Al-4V titanium alloy rod bar, wherein Al content is 6.0% ~ 6.3%, V content be 4.0% ~ 4.3%, O content is 0.16% ~ 0.18%, Fe content is 0.18% ~ 0.25%, Ti content is 88.97% ~ 89.66%, and tensile strength is not less than 1000Mpa, unit elongation is not less than 15%, and hardness is not less than 310HV.
Embodiment 1
Prepare ingot casting: prepare ingot casting: press titanium sponge, aluminum-vanadium alloy, aluminium shot as raw material, according to each element content range: Al 6.0%, V 4.0%, O 0.16%, Fe 0.18%, Ti 88.97% carries out charge calculation, and mix after taking above-mentioned raw materials respectively, then adopt 3500t oil press to be pressed into electrode block, re-using vacuum consumable arc-melting stove, to prepare diameter through three meltings be 460mm ingot casting, obtained ingot casting; Adopted by obtained ingot casting gas furnace to carry out cogging forging and pulling operation, adopt many fire time commutation piers to pull out, Heating temperature is 1050 DEG C, and soaking time is 200min, makes ingot diameters be kept to 200mm; Then carry out the pulling operation that a fire is secondary, Heating temperature 1000 DEG C, final forging temperature 900 DEG C, soaking time 200min, obtained diameter is the square billet of 120mm; Obtained square billet is carried out two fire time gross distortion rollings, the first fire time gross distortion rolling is: adopt heating by electric cooker, Heating temperature 930 DEG C, soaking time 80min, finishing temperature is 800 DEG C, makes square billet diameter be kept to 50mm; Second fire time gross distortion rolling is: adopt heating by electric cooker, Heating temperature 890 DEG C, soaking time 60min, finishing temperature 750 DEG C, obtained diameter is the bar of 11.5mm; Obtained bar is carried out stress annealing process, and annealing temperature is 650 DEG C, and annealing time is 1h; By the bar after process first through two roller hot straightening operation process, wherein, Heating temperature is 500 DEG C, and soaking time is 8min; Then being machined to tolerance of dimension through ground operation is H9, polishing machine is finally adopted to carry out polished finish, till being polished to Surface of Rod Bar light, obtained high-strong toughness Ti-6Al-4V titanium alloy rod bar, wherein Al content is 6.0%, V content is 4.0%, O content is 0.16%, Fe content be 0.18%, Ti content is 89.66%, tensile strength 1000Mpa, unit elongation 15%, hardness 310HV.
Embodiment 2
Prepare ingot casting: prepare ingot casting: press titanium sponge, aluminum-vanadium alloy, aluminium shot as raw material, according to each element content range: Al 6.2%, V 4.2%, O 0.17%, Fe 0.22%, Ti 89.21% carries out charge calculation, and mix after taking above-mentioned raw materials respectively, then adopt 3500t oil press to be pressed into electrode block, re-using vacuum consumable arc-melting stove, to prepare diameter through three meltings be 460mm ingot casting, obtained ingot casting; Adopted by obtained ingot casting gas furnace to carry out cogging forging and pulling operation, adopt many fire time commutation piers to pull out, Heating temperature is 1100 DEG C, and soaking time is 220min, makes ingot diameters be kept to 210mm; Then carry out the pulling operation that a fire is secondary, Heating temperature 1025 DEG C, final forging temperature 925 DEG C, soaking time 200min, obtained diameter is the square billet of 120mm; Obtained square billet is carried out two fire time gross distortion rollings, the first fire time gross distortion rolling is: adopt heating by electric cooker, Heating temperature 940 DEG C, soaking time 80min, finishing temperature is 825 DEG C, makes square billet diameter be kept to 50mm; Second fire time gross distortion rolling is: adopt heating by electric cooker, Heating temperature 900 DEG C, soaking time 60min, finishing temperature 780 DEG C, obtained diameter is the bar of 11.5mm; Obtained bar is carried out stress annealing process, and annealing temperature is 700 DEG C, and annealing time is 1.5h; By the bar after process first through two roller hot straightening operation process, wherein, Heating temperature is 650 DEG C, and soaking time is 9min; Then being machined to tolerance of dimension through ground operation is H8, polishing machine is finally adopted to carry out polished finish, till being polished to Surface of Rod Bar light, obtained high-strong toughness Ti-6Al-4V titanium alloy rod bar, wherein Al content is 6.2%, V content is 4.2%, O content is 0.17%, Fe content be 0.22%, Ti content is 89.21%, tensile strength is not less than 1100Mpa, unit elongation is not less than 16%, and hardness is not less than 320HV.
Embodiment 3
Prepare ingot casting: prepare ingot casting: press titanium sponge, aluminum-vanadium alloy, aluminium shot as raw material, according to each element content range: Al 6.3%, V 4.3%, O 0.18%, Fe 0.25%, Ti 88.97% carries out charge calculation, and mix after taking above-mentioned raw materials respectively, then adopt 3500t oil press to be pressed into electrode block, re-using vacuum consumable arc-melting stove, to prepare diameter through three meltings be 460mm ingot casting, obtained ingot casting; Adopted by obtained ingot casting gas furnace to carry out cogging forging and pulling operation, adopt many fire time commutation piers to pull out, Heating temperature is 1150 DEG C, and soaking time is 240min, makes ingot diameters be kept to 220mm; Then carry out the pulling operation that a fire is secondary, Heating temperature 1050 DEG C, final forging temperature 950 DEG C, soaking time 200min, obtained diameter is the square billet of 120mm; Obtained square billet is carried out two fire time gross distortion rollings, the first fire time gross distortion rolling is: adopt heating by electric cooker, Heating temperature 950 DEG C, soaking time 80min, finishing temperature is 850 DEG C, makes square billet diameter be kept to 50mm; Second fire time gross distortion rolling is: adopt heating by electric cooker, Heating temperature 910 DEG C, soaking time 60min, finishing temperature 800 DEG C, obtained diameter is the bar of 11.5mm; Obtained bar is carried out stress annealing process, and annealing temperature is 750 DEG C, and annealing time is 2h; By the bar after process first through two roller hot straightening operation process, wherein, Heating temperature is 750 DEG C, and soaking time is 10min; Then being machined to tolerance of dimension through ground operation is H7, polishing machine is finally adopted to carry out polished finish, till being polished to Surface of Rod Bar light, obtained high-strong toughness Ti-6Al-4V titanium alloy rod bar, wherein Al content is 6.3%, V content is 4.3%, O content is 0.18%, Fe content be 0.25%, Ti content is 89.97%, tensile strength is not less than 1200Mpa, unit elongation is not less than 17%, and hardness is not less than 330HV.
Claims (6)
1. a bio-medical high-strong toughness Ti-6Al-4V titanium alloy rod bar, it is characterized in that, 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 absolutely.
2. a preparation method for bio-medical high-strong toughness Ti-6Al-4V titanium alloy rod bar, is characterized in that, specifically implements according to following steps:
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 charge calculation, and mix after taking above-mentioned raw materials respectively, then adopt oil press to be pressed into electrode block, re-use vacuum consumable arc-melting stove through three meltings, obtained ingot casting;
Step 2: forging, pulling are square billet: adopted by the ingot casting obtained through step 1 gas furnace to carry out cogging forging and pulling operation, obtained square billet;
Step 3: rolling is bar: the square billet obtained through step 2 is carried out two fire time gross distortion rollings, obtained bar;
Step 4: thermal treatment: the bar obtained through step 3 is carried out stress annealing process, and annealing temperature is 650 ~ 750 DEG C, and annealing time is 1 ~ 2h;
Step 5: precision work: by the bar after processing through step 4 first through two roller hot straightening operation process, wherein, Heating temperature is 500 ~ 750 DEG C, and soaking time is 8 ~ 10min; Then being machined to tolerance of dimension through ground operation is H9 ~ H7, finally adopts polishing machine to carry out polished finish, till being polished to Surface of Rod Bar light, and obtained high-strong toughness Ti-6Al-4V titanium alloy rod bar.
3. the preparation method of a kind of bio-medical high-strong toughness Ti-6Al-4V titanium alloy rod bar according to claim 2, it is characterized in that, the concrete steps of described step 2 are: adopt many fire time commutation piers to pull out, Heating temperature is 1050 ~ 1150 DEG C, soaking time is 200 ~ 240min, makes ingot diameters be kept to 200 ~ 220mm; Then the pulling operation that a fire is secondary is carried out, Heating temperature 1000 ~ 1050 DEG C, final forging temperature 900 ~ 950 DEG C, soaking time 200min.
4. the preparation method of a kind of bio-medical high-strong toughness Ti-6Al-4V titanium alloy rod bar according to claim 2, it is characterized in that, the concrete steps of described step 3 are: the first fire time gross distortion rolling is: adopt heating by electric cooker, Heating temperature 930 ~ 950 DEG C, soaking time 80min, finishing temperature is 800 ~ 850 DEG C, makes square billet diameter be kept to 50mm; Second fire time gross distortion rolling is: adopt heating by electric cooker, Heating temperature 890 ~ 910 DEG C, soaking time 60min, finishing temperature 750 ~ 800 DEG C.
5. the preparation method of a kind of bio-medical high-strong toughness Ti-6Al-4V titanium alloy rod bar according to claim 2, it is characterized in that, obtained high-strong toughness Ti-6Al-4V titanium alloy rod bar, wherein Al content is 6.0% ~ 6.3%, V content is 4.0% ~ 4.3%, O content is 0.16% ~ 0.18%, Fe content be 0.18% ~ 0.25%, Ti content is 88.97% ~ 89.66%.
6. the preparation method of a kind of bio-medical high-strong toughness Ti-6Al-4V titanium alloy rod bar according to claim 2, it is characterized in that, obtained high-strong toughness Ti-6Al-4V titanium alloy rod bar, tensile strength is not less than 1000Mpa, unit elongation is not less than 15%, and hardness is not less than 310HV.
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