CN103397289B - Preparation method of TC4ELI titanium alloy bar - Google Patents
Preparation method of TC4ELI titanium alloy bar Download PDFInfo
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Abstract
The invention provides a preparation method of a TC4ELI titanium alloy bar. The preparation method comprises the following steps of: (1) carrying out cogging forging; (2) carrying out upsetting forging; (3) carrying out precise forging; (4) carrying out shearing, straightening and annealing treatment in sequence, thereby obtaining the cylindrical TC4ELI titanium alloy bar with the cross-section diameter of 15mm-90mm. The invention also provides a preparation method of the TC4ELI titanium alloy bar. The preparation method comprises the following steps of: (1) carrying out cogging forging; (2) carrying out upsetting forging; (3) carrying out precise forging; (4) rolling; (5) carrying out shearing, straightening and annealing treatment in sequence, thereby obtaining the cylindrical TC4ELI titanium alloy bar with the cross-section diameter of 8mm-15mm. The preparation method is simple in process, strong in repeatability and suitable for large-scale industrial production; the TC4ELI titanium alloy bar prepared by adopting the preparation method is uniform and fine in structure, high in microscopic structure level and excellent in mechanical property.
Description
Technical field
The invention belongs to titanium materials technology field, be specifically related to a kind of preparation method of TC4ELI titanium alloy rod bar.
Background technology
At present, TC4 titanium alloy (i.e. Ti6Al4V) and TC4ELI titanium alloy (i.e. Ti6Al4VELI) is mainly adopted to prepare joint type and wound class orthopaedics implantation instrument in the world, as aspects such as joint prosthesis, intramedullary needle, bone screw, tooth root implantation, Patella, hip joint and acetabular bones, being especially most widely used of low gap TC4ELI titanium alloy.The microstructure generally meeting Srgery grafting titanium alloy material product requirement is A1 level ~ A9 level, and wherein A1 level is organized the most tiny.In addition, research finds to organize the volume fraction of medium axle α phase more, and crystal grain is more tiny, and the TC4ELI alloy biomechanical property of acquisition is better, and this is also the target that medical TC4ELI alloy research and development field is pursued.
And the application of China biological medical titanium alloy TC4ELI and exploitation integral level not high, the technique of commercial scale production is unstable, mainly owing to adopting conventional forging complete processing, its forging temperature is too high, machining deformation amount is less, forging mode is chosen improper and later stage straightening temperature and crossed high factor, cause obtain Φ 8mm ~ Φ 90mm TC4ELI titanium alloy rod bar not only microstructure thinning and aspect of performance lot stability poor, also less Deng axle α phase volume fraction, die break is inadequate, and equi-axed crystal is thick.Meanwhile, the industrialization manufacturing procedure of conventional TC4ELI titanium alloy rod bar is complicated, with high costs, is difficult to the medical grade starting material providing low cost, high-quality.
Therefore, final purpose of the present invention improves grain uniformity and the mechanical property of TC4ELI titanium alloy rod bar, concrete grammar adopts the main process optimizing or improve medical grade bar, acquisition equiaxed structure is even, the alloy bar material of grain refining, and this is also the significant problem that current TC4ELI titanium alloy field is badly in need of solving.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned the deficiencies in the prior art, provides a kind of preparation method of TC4ELI titanium alloy rod bar.The uniform crystal particles of the TC4ELI titanium alloy rod bar utilizing the method to prepare is tiny, and microstructure grading is high, good mechanical performance.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of preparation method of TC4ELI titanium alloy rod bar, and it is characterized in that, the method comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described cogging forging is divided into 2 ~ 4 fire and completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 100 DEG C ~ 200 DEG C; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 410mm ~ 1020mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 260mm ~ 550mm;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, 1st fire is more than beta transformation point 100 DEG C ~ 120 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 25 DEG C ~ 35 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 25 DEG C ~ 35 DEG C; The cross-sectional shape of described middle forging stock is square, and the foursquare length of side is 95mm ~ 150mm;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain work in-process bar; Described precision fork is divided into 1 ~ 2 fire and completes, and the initial forging temperature of every fire time precision fork is 850 DEG C ~ 960 DEG C; Described work in-process bar is cylindrical bar, and its cross-sectional shape is 15mm ~ 90mm;
Step 4, the bar of work in-process described in step 3 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 15mm ~ 90mm.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, is characterized in that, the equipment of flat-die forging described in step 2 is air hammer, steam driven hammer or water pressure engine.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, is characterized in that, upsetting pull described in step 2 is forged to radial cross upsetting pull forging.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, it is characterized in that, in the final forging temperature of every fire time upsetting pull forging in the final forging temperature of every fire time cogging forging in step one, step 2 and step 3, the final forging temperature of every fire time precision fork is all not less than 700 DEG C.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, is characterized in that, the temperature of anneal described in step 4 is 710 DEG C ~ 750 DEG C, and the time of described anneal is 50min ~ 80min; The temperature of described aligning is 400 DEG C ~ 500 DEG C.
Present invention also offers the preparation method of another TC4ELI titanium alloy rod bar, it is characterized in that, the method comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described cogging forging is divided into 2 ~ 4 fire and completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 100 DEG C ~ 200 DEG C; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 410mm ~ 1020mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 260mm ~ 550mm;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, 1st fire is more than beta transformation point 100 DEG C ~ 120 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 25 DEG C ~ 35 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 25 DEG C ~ 35 DEG C; The cross-sectional shape of described middle forging stock is square, and the foursquare length of side is 95mm ~ 150mm;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described precision fork is divided into two fire and completes, and wherein the initial forging temperature of the first fire time precision fork is 900 DEG C ~ 960 DEG C, and the initial forging temperature of the second fire time precision fork is 850 DEG C ~ 930 DEG C; Described smart forging rod billet is cylindrical bar base, and its diameter of section is 25mm ~ 40mm;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to forging rod billet smart described in step 3, after air cooling, obtain work in-process bar; It is 750 DEG C ~ 780 DEG C that the beginning of described rolling rolls temperature, and described work in-process bar is cylindrical bar, and its diameter of section is 8mm ~ 15mm;
Step 5, the bar of work in-process described in step 4 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 8mm ~ 15mm.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, is characterized in that, the equipment of flat-die forging described in step 2 is air hammer, steam driven hammer or water pressure engine.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, is characterized in that, upsetting pull described in step 2 is forged to radial cross upsetting pull forging.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, it is characterized in that, in the final forging temperature of every fire time upsetting pull forging in the final forging temperature of every fire time cogging forging in step one, step 2, step 3, described in the final forging temperature of every fire time precision fork and step 4, the finishing temperature of rolling is all not less than 700 DEG C.
The preparation method of above-mentioned a kind of TC4ELI titanium alloy rod bar, is characterized in that, the temperature of anneal described in step 5 is 710 DEG C ~ 750 DEG C, and the time of described anneal is 50min ~ 80min; The temperature of described aligning is 400 DEG C ~ 500 DEG C.
The present invention compared with prior art has the following advantages:
1, the present invention is by carrying out large quantity research discovery to the resistance to deformation of TC4ELI titanium alloy material, the initial forging temperature of cogging forging, upsetting pull forging and precision fork is higher, the resistance to deformation of TC4ELI titanium alloy material is less, more easily forge shaping, but the too high meeting of initial forging temperature causes the plasticity of TC4ELI titanium alloy material to decline, cause and occur fracture or heat cracking because being out of shape in a large number; If initial forging temperature is close to the fusing point of TC4ELI titanium alloy, then very easily can rupture because the grain-boundary strength of TC4ELI titanium alloy material significantly reduces.In addition, owing to forging the main heat produced in deformation process by TC4ELI titanium alloy material to maintain own temperature, final forging temperature is lower, then viscous deformation is larger to organizing role, heap die break degree higher, but final forging temperature is too low, then can make TC4ELI titanium alloy material due to plasticity too low and produce a large amount of crackle.Therefore the present invention is by large quantity research, final optimization pass goes out each forging stage rational initial forging temperature and final forging temperature, enable TC4ELI titanium alloy material under the condition keeping suitable plasticity to heap die break, and be conducive to generating a large amount of axle α phases such as grade and a small amount of nascent strip α phase while die break, reduce the generation of crackle simultaneously;
2, the present invention is found by large quantity research, the forging times number of cogging forging, upsetting pull forging and precision fork and forging deformation amount for improve TC4ELI titanium alloy material interior tissue, to reduce its ununiformity be vital.Along with the increase of forging deformation amount, the ununiformity of TC4ELI titanium alloy material interior tissue lowers, but this attenuating speed tends towards stability along with the increase of forging deformation amount, forging deformation amount increases, die break can be made more even, but deflection is excessive can bring series of problems again, as low in economic efficiency, production cycle extend, oxidation defect and crackle obviously, degradation etc.Therefore, the present invention passes through the forging times in each forging stage and the optimal control of forging deformation amount, make under the prerequisite ensureing quality product, reduction adds showing tremendous enthusiasm time and forging number of times as far as possible, final design goes out the preparation method of the rational TC4ELI titanium alloy rod bar of science, made TC4ELI titanium alloy rod bar homogeneous microstructure is tiny, good mechanical performance.
3, suitable forging mode and forging equipment is selected to be that the present invention improves one of important content of TC4ELI titanium alloy material performance.Utilizing quick forging machine to carry out cogging forging can broken bulk tissue, and can improve banded structure; Flat-die forging equipment carries out upsetting pull forging not only makes the tissue on forging surface be uniformly distributed, and the tissue of forging height of center line of segragation can also be made to move on to outer next, thus the segregation situation in the middle part of forging is improved.The forging mode that the present invention preferably adopts radial cross upsetting pull to forge, makes forging centre portions have high segregation and organizes and more easily move to outer surface, thus can effectively ensure that homogeneous microstructure is tiny, ensure the superior in quality of TC4ELI titanium alloy rod bar.
4, the present invention is when preparing diameter of section and being the small-sized bar of 8mm ~ 15mm, how fiery upsetting pull technology is combined with the rolling technique of aximal deformation value, can effective fragmentation crystal grain, effective elimination distortion dead band is on the impact of tissue consistency, be conducive to the homogeneity of structure improving TC4ELI titanium alloy rod bar, make its microstructure thinning degree at least improve 1 ~ 2 rank compared with similar specification product.
5, the present invention adopts the lesser temps of 400 DEG C ~ 500 DEG C to align, and can effectively prevent growing up of crystal grain, ensures the evenly tiny of tissue.
6, adopt the TC4ELI titanium alloy rod bar prepared of the present invention etc. axle α phase volume fraction reach more than 70%, without the generation of lamella α phase boundling, wait axle α uniform small grains.The TC4ELI titanium alloy rod bar adopting the present invention to prepare compares with similar products at home and abroad, it is greater than 14% at unit elongation, relative reduction in area is greater than on the basis of 45%, tensile strength is 989MPa ~ 1152MPa, yield strength is 908MPa ~ 1093MPa, microstructure is rated A1 ~ A3 level, and ultrasonic inspection rank is high.In addition, this TC4ELI titanium alloy rod bar has good biocompatibility, machinability and high erosion resistance, can conveniently for the making of medicine equipment.
7, process window of the present invention is wide, and homogeneity of structure is easy to control, and lot stability improves greatly, product strength, toughness and plasticity good match.
8, preparation technology of the present invention is simple, repeatable strong, is suitable for large-scale industrial production.
Below in conjunction with embodiment, the present invention is described in further detail.
Embodiment
Embodiment 1
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 640mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 300mm; Described cogging forging is divided into 2 fire and completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 150 DEG C, and the final forging temperature of every fire time cogging forging is all not less than 700 DEG C;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, wherein the 1st fire is more than beta transformation point 110 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 30 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 30 DEG C; The cross-sectional shape of described middle forging stock is square, and the foursquare length of side is 110mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is air hammer; Described upsetting pull forging is preferably radial cross upsetting pull, and described radial cross upsetting pull refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulls out vertically again; The final forging temperature of every fire time upsetting pull forging is all not less than 700 DEG C;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 20mm; Described precision fork is divided into 2 fire and completes, wherein the initial forging temperature of the first fire time precision fork is 950 DEG C, in the middle of after first fire time precision fork, forging stock is transformed into diameter of section is the cylindrical of 60mm, the initial forging temperature of the second fire time precision fork is 880 DEG C, and the final forging temperature of every fire time precision fork is all not less than 700 DEG C;
Step 4, the bar of work in-process described in step 3 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; The temperature of described aligning is 450 DEG C, and the temperature of described anneal is 720 DEG C, and the time of described anneal is 60min; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 20mm.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in table 1.
Embodiment 2
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 410mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 260mm; Described cogging forging is divided into 3 fire and completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 180 DEG C, and the final forging temperature of every fire time cogging forging is all not less than 700 DEG C;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, wherein the 1st fire is more than beta transformation point 120 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 35 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 35 DEG C; The cross-sectional shape of described middle forging stock is square, and the foursquare length of side is 95mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is steam driven hammer; Described upsetting pull forging is preferably radial cross upsetting pull, and described radial cross upsetting pull refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulls out vertically again; The final forging temperature of every fire time upsetting pull forging is all not less than 700 DEG C;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 15mm; Described precision fork is divided into 2 fire and completes, wherein the initial forging temperature of the first fire time precision fork is 930 DEG C, in the middle of after first fire time precision fork, forging stock is transformed into diameter of section is the cylindrical of 50mm, the initial forging temperature of the second fire time precision fork is 850 DEG C, and the final forging temperature of every fire time precision fork is all not less than 700 DEG C;
Step 4, the bar of work in-process described in step 3 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; The temperature of described aligning is 480 DEG C, and the temperature of described anneal is 710 DEG C, and the time of described anneal is 50min; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 15mm.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in table 1.
Embodiment 3
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 950mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 480mm; Described cogging forging is divided into 2 fire and completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 200 DEG C, and the final forging temperature of every fire time cogging forging is all not less than 700 DEG C;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, wherein the 1st fire is more than beta transformation point 120 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 25 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 25 DEG C; The cross-sectional shape of described middle forging stock is square, and the foursquare length of side is 125mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is water pressure engine; Described upsetting pull forging is preferably radial cross upsetting pull, and described radial cross upsetting pull refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulls out vertically again; The final forging temperature of every fire time upsetting pull forging is all not less than 700 DEG C;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 32mm; Described precision fork is divided into 2 fire and completes, wherein the initial forging temperature of the first fire time precision fork is 960 DEG C, in the middle of after first fire time precision fork, forging stock is transformed into diameter of section is 68mm, the initial forging temperature of the second fire time precision fork is 870 DEG C, and the final forging temperature of every fire time precision fork is all not less than 700 DEG C;
Step 4, the bar of work in-process described in step 3 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; The temperature of described aligning is 500 DEG C, and the temperature of described anneal is 720 DEG C, and the time of described anneal is 70min; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is the circle of 32mm.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in table 1.
Embodiment 4
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 950mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 480mm; Described cogging forging is divided into 4 fire and completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 170 DEG C, and the final forging temperature of every fire time cogging forging is all not less than 700 DEG C;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, wherein the 1st fire is more than beta transformation point 100 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 25 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 25 DEG C; The cross-sectional shape of described middle forging stock is square, and the foursquare length of side is 135mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is air hammer; Described upsetting pull forging is preferably radial cross upsetting pull, and described radial cross upsetting pull refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulls out vertically again; The final forging temperature of every fire time upsetting pull forging is all not less than 700 DEG C;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 80mm; Described precision fork is divided into 1 fire and completes, and the initial forging temperature of described precision fork is 90 DEG C, and the final forging temperature of described precision fork is not less than 700 DEG C;
Step 4, the bar of work in-process described in step 3 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; The temperature of described aligning is 450 DEG C, and the temperature of described anneal is 730 DEG C, and the time of described anneal is 80min; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 80mm.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in table 1.
Embodiment 5
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 1020mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 550mm; Described cogging forging is divided into 4 fire and completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 130 DEG C, and the final forging temperature of every fire time cogging forging is all not less than 700 DEG C;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, wherein the 1st fire is more than beta transformation point 120 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 25 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 25 DEG C; The cross-sectional shape of described middle forging stock is square, and the foursquare length of side is 150mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is steam driven hammer; Described upsetting pull forging is preferably radial cross upsetting pull, and described radial cross upsetting pull refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulls out vertically again; The final forging temperature of every fire time upsetting pull forging is all not less than 700 DEG C;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 90mm; Described precision fork is divided into 1 fire and completes, and the initial forging temperature of described precision fork is 910 DEG C, and the final forging temperature of described precision fork is not less than 700 DEG C;
Step 4, the bar of work in-process described in step 3 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; The temperature of described aligning is 420 DEG C, and the temperature of described anneal is 750 DEG C, and the time of described anneal is 70min; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 90mm.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in table 1.
Embodiment 6
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 640mm, and the cross-sectional shape of described elementary forging stock is square, and its length of side is 300mm; Described cogging forging is divided into 3 fire and completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 150 DEG C, and the final forging temperature of every fire time cogging forging is all not less than 700 DEG C;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, wherein the 1st fire is more than beta transformation point 110 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 30 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 30 DEG C; The cross-sectional shape of described middle forging stock is square, and its length of side is 110mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is air hammer; Described upsetting pull forging is preferably radial cross upsetting pull, and described radial cross upsetting pull refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulls out vertically again; The final forging temperature of every fire time upsetting pull forging is all not less than 700 DEG C;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described smart forging rod billet is cylindrical bar base, and its diameter of section is 25mm; Described precision fork is divided into two fire and completes, wherein the initial forging temperature of the first fire time precision fork is 900 DEG C, in the middle of after first fire time precision fork, forging stock is transformed into diameter of section is the cylindrical of 60mm, the initial forging temperature of the second fire time precision fork is 850 DEG C, and the final forging temperature of every fire time precision fork is all not less than 700 DEG C;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to forging rod billet smart described in step 3, after air cooling, obtain work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 10mm; It is 780 DEG C that the beginning of described rolling rolls temperature, and the finishing temperature of described rolling is not less than 700 DEG C;
Step 5, the bar of work in-process described in step 4 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 10mm; The temperature of described anneal 730 DEG C, the time of described anneal is 70min, and the temperature of described aligning is 480 DEG C.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in table 1.
Embodiment 7
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 720mm, and the cross-sectional shape of described elementary forging stock is square, and its length of side is 400mm; Described cogging forging is divided into 2 fire and completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 100 DEG C, and the final forging temperature of every fire time cogging forging is all not less than 700 DEG C;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, wherein the 1st fire is more than beta transformation point 120 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 35 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 35 DEG C; The cross-sectional shape of described middle forging stock is square, and its length of side is 120mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is steam driven hammer; Described upsetting pull forging is preferably radial cross upsetting pull, and described radial cross upsetting pull refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulls out vertically again; The final forging temperature of every fire time upsetting pull forging is all not less than 700 DEG C;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described smart forging rod billet is cylindrical bar base, and its diameter of section is 30mm; Described precision fork is divided into two fire and completes, wherein the initial forging temperature of the first fire time precision fork is 950 DEG C, in the middle of after first fire time precision fork, forging stock is transformed into diameter of section is the cylindrical of 65mm, the initial forging temperature of the second fire time precision fork is 920 DEG C, and the final forging temperature of every fire time precision fork is all not less than 700 DEG C;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to forging rod billet smart described in step 3, after air cooling, obtain work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 13mm; It is 760 DEG C that the beginning of described rolling rolls temperature, and the finishing temperature of described rolling is not less than 700 DEG C;
Step 5, the bar of work in-process described in step 4 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 13mm; The temperature of described anneal is 710 DEG C, and the time of described anneal is 60min, and the temperature of described aligning is 450 DEG C.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in table 1.
Embodiment 8
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 410mm, and the cross-sectional shape of described elementary forging stock is square, and its length of side is 260mm; Described cogging forging is divided into 2 fire and completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 200 DEG C, and the final forging temperature of every fire time cogging forging is all not less than 700 DEG C;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, wherein the 1st fire is more than beta transformation point 120 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 35 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 35 DEG C; The cross-sectional shape of described middle forging stock is square, and its length of side is 95mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is water pressure engine; Described upsetting pull forging is preferably radial cross upsetting pull, and described radial cross upsetting pull refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulls out vertically again; The final forging temperature of every fire time upsetting pull forging is all not less than 700 DEG C;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described smart forging rod billet is cylindrical bar base, and its diameter of section is 25mm; Described precision fork is divided into two fire and completes, wherein the initial forging temperature of the first fire time precision fork is 900 DEG C, in the middle of after first fire time precision fork, forging is transformed into diameter of section is the cylindrical of 58mm, the initial forging temperature of the second fire time precision fork is 850 DEG C, and the final forging temperature of every fire time precision fork is all not less than 700 DEG C;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to forging rod billet smart described in step 3, after air cooling, obtain work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 8mm; It is 750 DEG C that the beginning of described rolling rolls temperature, and the finishing temperature of described rolling is not less than 700 DEG C;
Step 5, the bar of work in-process described in step 4 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 8mm; The temperature of described anneal is 710 DEG C, and the time of described anneal is 80min, and the temperature of described aligning is 400 DEG C.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in table 1.
Embodiment 9
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 1020mm, and the cross-sectional shape of described elementary forging stock is square, and its length of side is 550mm; Described cogging forging totally 4 fire completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 100 DEG C, and the final forging temperature of every fire time cogging forging is all not less than 700 DEG C;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, wherein the 1st fire is more than beta transformation point 120 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 25 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 25 DEG C; The cross-sectional shape of described middle forging stock is square, and its length of side is 150mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is air hammer; Described upsetting pull forging is preferably radial cross upsetting pull, and described radial cross upsetting pull refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulls out vertically again; The final forging temperature of every fire time upsetting pull forging is all not less than 700 DEG C;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described smart forging rod billet is cylindrical bar base, and its diameter of section is 40mm; Described precision fork is divided into two fire and completes, wherein the initial forging temperature of the first fire time precision fork is 960 DEG C, the circle of the cross-sectional shape of forging stock to be diameter be 70mm in the middle of after first precision fork, the initial forging temperature of the second fire time precision fork is 930 DEG C, and the final forging temperature of every fire time precision fork is all not less than 700 DEG C;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to forging rod billet smart described in step 3, after air cooling, obtain work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 15mm; It is 780 DEG C that the beginning of described rolling rolls temperature, and the finishing temperature of described rolling is not less than 700 DEG C;
Step 5, the bar of work in-process described in step 4 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 15mm; The temperature of described anneal is 750 DEG C, and the time of described anneal is 50min, and the temperature of described aligning is 400 DEG C.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in table 1.
Embodiment 10
The preparation method of the present embodiment TC4ELI titanium alloy rod bar comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 950mm, and the cross-sectional shape of described elementary forging stock is square, and its length of side is 480mm; Described cogging forging is divided into 3 fire and completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 200 DEG C, and the final forging temperature of every fire time cogging forging is all not less than 700 DEG C;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, wherein the 1st fire is more than beta transformation point 100 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 25 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 25 DEG C; The cross-sectional shape of described middle forging stock is square, and its length of side is 135mm; Described flat-die forging equipment is preferably air hammer, steam driven hammer or water pressure engine, and the flat-die forging equipment that the present embodiment adopts is water pressure engine; Described upsetting pull forging is preferably radial cross upsetting pull, and described radial cross upsetting pull refers to first carries out jumping-up vertically by elementary forging stock, then carries out repeatedly jumping-up and pulling along two mutually perpendicular directions on cross section, finally pulls out vertically again; The final forging temperature of every fire time upsetting pull forging is all not less than 700 DEG C;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described smart forging rod billet is cylindrical bar base, and its diameter of section is 32mm; Described precision fork is divided into two fire and completes, wherein the initial forging temperature of the first fire time precision fork is 900 DEG C, in the middle of after first fire time precision fork, forging is transformed into diameter of section is the cylindrical of 65mm, the initial forging temperature of the second fire time precision fork is 850 DEG C, and the final forging temperature of every fire time precision fork is all not less than 700 DEG C;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to forging rod billet smart described in step 3, after air cooling, obtain work in-process bar; Described work in-process bar is cylindrical bar, and its diameter of section is 13.5mm; It is 750 DEG C that the beginning of described rolling rolls temperature, and the finishing temperature of described rolling is not less than 700 DEG C;
Step 5, the bar of work in-process described in step 4 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 13.5mm; The temperature of described anneal is 710 DEG C, and the time of described anneal is 80min, and the temperature of described aligning is 400 DEG C.
The performance test data of TC4ELI titanium alloy rod bar prepared by the present embodiment is in table 1.
The performance test data of table 1 embodiment of the present invention 1 to 10TC4ELI titanium alloy rod bar
As shown in Table 1, the diameter of section specification of the TC4ELI titanium alloy rod bar adopting the present invention to prepare is 8mm ~ 90mm, the tensile strength R under 25 DEG C of room temperature conditions
mfor 989MPa ~ 1152MPa, yield strength R
afor 908MPa ~ 1093MPa, unit elongation A is 14% ~ 17.5%, relative reduction in area Z is 45% ~ 53%, and microstructure is rated A1 ~ A3 level, is significantly better than existing TC4ELI titanium alloy rod bar; TC4ELI titanium alloy rod bar excellent combination property prepared by the present invention is described thus.
The above is only preferred embodiment of the present invention, not imposes any restrictions the present invention.Every above embodiment is done according to invention technical spirit any simple modification, change and equivalence change, all still belong in the protection domain of technical solution of the present invention.
Claims (5)
1. a preparation method for TC4ELI titanium alloy rod bar, is characterized in that, the method comprises the following steps:
Step one, utilize quick forging machine to carry out cogging forging to TC4ELI titan alloy casting ingot, after air cooling, obtain elementary forging stock; Described cogging forging is divided into 2 ~ 4 fire and completes, and the initial forging temperature of every fire time cogging forging is more than beta transformation point 100 DEG C ~ 200 DEG C; Described TC4ELI titan alloy casting ingot is cylindrical ingot, and its diameter of section is 410mm ~ 1020mm, and the cross-sectional shape of described elementary forging stock is square, and the foursquare length of side is 260mm ~ 550mm;
Step 2, utilize flat-die forging equipment to carry out upsetting pull forging to forging stock elementary described in step one, after water-cooled, obtain middle forging stock; Described upsetting pull forging is divided into 6 fire and completes, 1st fire is more than beta transformation point 100 DEG C ~ 120 DEG C with the initial forging temperature of the 2nd fire time upsetting pull forging, 3rd fire is more than beta transformation point 25 DEG C ~ 35 DEG C with the initial forging temperature of the 4th fire time upsetting pull forging, and the 5th fire initial forging temperature that is secondary and time upsetting pull forging of the 6th fire is below beta transformation point 25 DEG C ~ 35 DEG C; The cross-sectional shape of described middle forging stock is square, and the foursquare length of side is 95mm ~ 150mm;
Step 3, utilize precise forging machine to carry out precision fork to forging stock in the middle of described in step 2, after air cooling, obtain smart forging rod billet; Described precision fork is divided into two fire and completes, and wherein the initial forging temperature of the first fire time precision fork is 900 DEG C ~ 960 DEG C, and the initial forging temperature of the second fire time precision fork is 850 DEG C ~ 930 DEG C; Described smart forging rod billet is cylindrical bar base, and its diameter of section is 25mm ~ 40mm;
Step 4, utilize bar materials on continuous rolling mill to carry out a fire time rolling to forging rod billet smart described in step 3, after air cooling, obtain work in-process bar; It is 750 DEG C ~ 780 DEG C that the beginning of described rolling rolls temperature, and described work in-process bar is cylindrical bar, and its diameter of section is 8mm ~ 15mm;
Step 5, the bar of work in-process described in step 4 is carried out cutting to length, aligning and anneal successively, obtain TC4ELI titanium alloy rod bar; Described TC4ELI titanium alloy rod bar is cylindrical bar, and its diameter of section is 8mm ~ 15mm.
2. the preparation method of a kind of TC4ELI titanium alloy rod bar according to claim 1, is characterized in that, the equipment of flat-die forging described in step 2 is air hammer, steam driven hammer or water pressure engine.
3. the preparation method of a kind of TC4ELI titanium alloy rod bar according to claim 1, is characterized in that, upsetting pull described in step 2 is forged to radial cross upsetting pull forging.
4. the preparation method of a kind of TC4ELI titanium alloy rod bar according to claim 1, it is characterized in that, in the final forging temperature of every fire time upsetting pull forging in the final forging temperature of every fire time cogging forging in step one, step 2, step 3, described in the final forging temperature of every fire time precision fork and step 4, the finishing temperature of rolling is all not less than 700 DEG C.
5. the preparation method of a kind of TC4ELI titanium alloy rod bar according to claim 1, is characterized in that, the temperature of anneal described in step 5 is 710 DEG C ~ 750 DEG C, and the time of described anneal is 50min ~ 80min; The temperature of described aligning is 400 DEG C ~ 500 DEG C.
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