CN109822023A - A kind of heat cladding forging method of cobalt-base alloys ingot - Google Patents
A kind of heat cladding forging method of cobalt-base alloys ingot Download PDFInfo
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- CN109822023A CN109822023A CN201910131058.2A CN201910131058A CN109822023A CN 109822023 A CN109822023 A CN 109822023A CN 201910131058 A CN201910131058 A CN 201910131058A CN 109822023 A CN109822023 A CN 109822023A
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Abstract
The present invention relates to the hot-working method of alloy field, the heat cladding forging method of specially a kind of cobalt-base alloys ingot belongs to the forging field of difficult deformation cobalt-base alloys.Forging blank is obtained by vacuum induction melting, electroslag remelting first, then blank heating is kept the temperature to 1150 DEG C~1250 DEG C, then with fire resisting asbestos carry out cladding heat preservation, is forged after reaching soaking time.This method uses fire resisting asbestos to carry out cladding forging for the first time, strict control blank temperature is within the scope of certain temperature in forging process, and through excessive fire time forging, cladding heat preservation is all carried out after every fire time, it is final to obtain qualified forging to ensure that CoCrMo alloy forging stock is constantly in good plastic processing state.
Description
Technical field
The present invention relates to the hot-working method of alloy field, the heat cladding forging method of specially a kind of cobalt-base alloys ingot,
Belong to the forging field of difficult deformation cobalt-base alloys.
Background technique
Cobalt-base alloys has excellent high-temperature behavior, excellent heat resistance, corrosion resistance, and has marresistance outstanding
Energy.Therefore, cobalt-base alloys is in fields such as Aeronautics and Astronautics, nuclear engineering, energy source and power, communications and transportation, petrochemical industry, metallurgy, medicine
There is wide purposes.The cobalt-base alloys medically used is often referred to cochrome, at abroad, cobalt-base alloys is in joint prosthesis
Aspect is widely used, forging vitallium (molybdenum is added in cochrome) therein, is widely used in manufacture human body implantation
Bone.1) vitallium has no toxic side effect in addition to including；2) good bio-compatibility；3) high-intensitive；4) good stabilization
Property and reliability outside, and there is 5) excellent corrosion resistance, the corrosion including tissue liquid, in human body always in blunt
State can accomplish not change all the life.But the forgeability of cobalt-base alloys (including vitallium) is very poor.Vitallium leads to
Common Foundry Production, in some developed country's forgings；Compared to foreign countries, domestic forging technology gap it is obvious that
Influence the popularization and application of domestic vitallium product.
Medical Cobalt-Based Alloys typically contain the alloying elements such as nickel, molybdenum, tungsten using cobalt and chromium as basis.U.S. material with
Testing 4 kinds of association (ASTM:American Society for Testing and Materials) recommendation can be in surgical implantation
Used in cobalt-base alloys, be respectively: forging Co-Cr-Mo alloy, forge Co-Cr-W-Ni alloy, forging Co-Ni-Cr-Mo close
Gold forges Co-Ni-Cr-Mo-W-Fe alloy.Wherein, forging Co-Cr-Mo alloy and forging Co-Ni-Cr-Mo alloy are extensive
It is manufactured for implant.Due to containing Ni in forging Co-Ni-Cr-Mo alloy, although improving its casting character and processing performance,
Ni can release Ni ion in human body, cause allergic reaction, so the forging Co-Cr-Mo alloy without Ni allows user to feel
Feel safer.
It casts CoCrMo alloy and has just been used to manufacturing artificial joint in nineteen fifties.Cast CoCrMo alloy
In tissue, since there are brittle carbide and intermetallic compound phases, so that the ductility of casting CoCrMo alloy is deteriorated；Together
When, since the corrosion resistance for unevenly making casting CoCrMo alloy of ingredient in cast structure is affected.And pass through forging
After making, CoCrMo alloy has much higher intensity and ductility, and corrosion resistance also has improvement.Forge cobalt-base alloys tool
There is face-centered cubic crystal structure, microstructure is austenite；Moreover, austenite will not occur in 650 DEG C of temperatures above forgings
The recrystallization of tissue can smash original austenite grain, by annealing, obtain more tiny crystallite dimension and showing more evenly
Micro-structure.
Currently, there are no CoCrMo alloy pigs to forge successfully report at home.
Summary of the invention
The purpose of the present invention is to provide a kind of heat cladding forging methods of cobalt-base alloys ingot, as joint prosthesis material
The new forging production technique method of CoCrMo alloy, successfully produces qualified cobalt-base alloys forging.
The technical scheme is that
A kind of heat cladding forging method of cobalt-base alloys ingot, by weight percentage, the chemical component of cobalt-base alloys:
Cr28.0%~30%, Mo5.5%~6.5%, Ni, Fe, Mn, Nb, Si are respectively less than 0.1%, O, C be respectively less than 0.05%, N <
0.20%, Co surplus；It is coated using the asbestos of fire resisting containing zirconium, zirconium fire resisting asbestos will be contained before package and are layered on the ground, high temperature is waited
Forging stock is wrapped up after coming out of the stove；When cobalt-base alloys forging stock shove charge, for furnace temperature no more than 600 DEG C, heating rate cannot be too fast, is less than
50 DEG C/h, forging stock is first heated to 1150 DEG C~1250 DEG C, package of coming out of the stove after keeping the temperature 1~3 hour；Continuation is melted down after package to exist
After 1150 DEG C~1250 DEG C keep the temperature 1~3 hour, forging of coming out of the stove.
The heat cladding forging method of the cobalt-base alloys ingot, operates without jumping-up when forging and stamping.
The heat cladding forging method of the cobalt-base alloys ingot, alloy pig will sufficiently be kept the temperature before every fire time is forged, i.e., will be through
The forging stock for crossing one heat forging, which melts down, to be heated to require temperature, is reached package of coming out of the stove after soaking time, is melted down guarantor again after package
Temperature, the soaking time for reaching requirement is come out of the stove again carries out lower one heat forging.
The heat cladding forging method of the cobalt-base alloys ingot, last fire time forging blank holding temperature is 1150 DEG C,
Soaking time was controlled at 1~2 hour.
The heat cladding forging method of the cobalt-base alloys ingot, shortens the time interval after coming out of the stove to forging chopping block as far as possible,
Avoid blank temperature drop too many.
The heat cladding forging method of the cobalt-base alloys ingot, the final forging temperature of every fire time blank cannot be below 1020 DEG C.
The heat cladding forging method of the cobalt-base alloys ingot, the deflection of every fire time forging want duplex forging technique to want
It asks.
The heat cladding forging method of the cobalt-base alloys ingot, real-time measurement forging stock temperature when forging.
The heat cladding forging method of the cobalt-base alloys ingot, forging stock after last one heat forging 1020 DEG C~
1050 DEG C are diffused annealing, and soaking time was at 1~2 hour.
The heat cladding forging method of the cobalt-base alloys ingot, in the asbestos of fire resisting containing zirconium, the weight content of zirconium oxide is
15%~16%.
Design philosophy of the invention is:
The deformation of cobalt-base alloys difficulty, hot-working character are poor, it is difficult to obtain qualified forging stock.During practical forging, together
Steel are compared, and the forging temperature section of cobalt-base alloys forging stock is relatively high, and when forging stock temperature is reduced to forging temperature section, must
It must stop forging, forging stock cracking and other issues otherwise can occur, waste product occur.To guarantee that the forging stock temperature long period is in forging
Temperature range is made, forging production efficiency and forging stock quality are improved, wraps up forging stock using fire resisting asbestos, reaching prevents forging stock temperature drop mistake
Fastly, extend the purpose of forging time, to obtain qualified forging, improve production efficiency.
The invention has the advantages and beneficial effects that:
The forging production technique method of joint prosthesis of the present invention material C oCrMo alloy, this method pass through vaccum sensitive stove
Melting, electroslag remelting obtain forging blank.Then blank heating is kept the temperature to 1150 DEG C~1250 DEG C, then is carried out with fire resisting asbestos
Cladding heat preservation, is forged after reaching soaking time.This method uses fire resisting asbestos cladding to forge for the first time, stringent in forging process
Blank temperature is controlled within the scope of certain temperature, and through excessively fire time forging, cladding heat preservation is all carried out after every fire is secondary, to ensure
CoCrMo alloy forging stock is constantly in good plastic processing state, final to obtain qualified forging.
Detailed description of the invention
Fig. 1 is in fire resisting asbestos tiling macrograph.
Fig. 2 is the forging stock shove charge heating and thermal insulation figure after package.
Fig. 3 is to forge to Φ 150mm material base macrograph.
Fig. 4 is the forging material macrograph finally obtained.
Fig. 5 is the macrograph of product after forging, and surface scale is fallen in reconditioning.
Fig. 6 is the macrograph after forging after product machining.
Fig. 7 is product metallographic microscope after forging.
Specific embodiment
In the following, making further illustrate to the present invention in conjunction with specific embodiments.
Embodiment 1:
(1) obtain forging stock, i.e., the ESR ingot obtained after vaccum sensitive stove and electroslag remelting, having a size of diameter 240mm,
Long 580mm；
It (2), will be with a thickness of the ovenstone containing zirconium of 15~20mm as shown in Figure 1, selecting the asbestos of fire resisting containing zirconium of sufficient size
Cotton is layered on the ground, is wrapped up after waiting high temperature forging stock to come out of the stove；
In the asbestos of fire resisting containing zirconium of the present embodiment, the weight content of zirconium oxide is 15%~16%.
(3) furnace temperature reaches between 600 DEG C~700 DEG C, forging stock shove charge, is uniformly heating to 1150 DEG C and then keeps the temperature again, keeps the temperature
It comes out of the stove after 150min and wraps up the asbestos of fire resisting containing zirconium；
(4) as shown in Fig. 2, the forging stock after package melts down again, in 1150 DEG C of 60~90min of heat preservation；
(5) before one heat forging, it is necessary to which being preheated to chopping block (can also be by way of first forging other products
Preheat chopping block) to 150 DEG C or more, temperature drop is too fast when preventing from forging cobalt-base alloys；
(6) the Φ 240mm ESR ingot of the asbestos of fire resisting containing zirconium is wrapped up after 1150 DEG C of heating and thermal insulation enough times, carries out first
Then fiery forging, forging to diameter of phi 210mm are melted down, the asbestos of fire resisting containing zirconium are wrapped up after 1150 DEG C of heat preservation 150min, then melt down
Keep the temperature 60~90min；
(7) the second fire time forging is carried out to forge Φ 210mm forging stock to Φ 180mm；Again through third fire time forging, by Φ
180mm forging stock is forged to Φ 150mm；Forging stock will be melted down after every fire time forging, package is resistance to containing zirconium after 1150 DEG C of heat preservation 150min
Flint cotton, then 60~90min of heat preservation is melted down, material base is shown in Fig. 3 after forging；
(8) the 4th fire time forging is carried out to forge Φ 150mm forging stock to Φ 130mm；Again through the 5th fire time forging, by Φ
130mm forging stock is forged to Φ 110mm；Forging stock will be melted down after every fire time forging, fire resisting containing zirconium is wrapped up after 1150 DEG C of heat preservation 60min
Asbestos, then 60~90min of heat preservation is melted down, material base is shown in Fig. 4 after forging, sees Fig. 5 by descale reconditioning；
Wherein, it is operated when forging and stamping without jumping-up, forging stock will be melted down heating and thermal insulation after every fire time forging, reach heat preservation and want
It comes out of the stove after asking package, held for some time is melted down after package, forging of then coming out of the stove.Forging stock after last one heat forging exists
1030 DEG C are diffused annealing, and soaking time is in 90min.
(9) as shown in fig. 6, obtaining the ingot of Φ 99mm after machining；
(10) table 1 is chemical component inspection after forging, and inspection result meets product requirement；Coefficient of thermal expansion detects after forging, meets
It is required that linear expansion coefficient (20~600 DEG C): 14.9756 × 10-6K-1, in error range；Table 2 is mechanical property after forging
Detection, satisfactory Rp0.2 >=360MPa；
Chemical component after table 1 is forged
Mechanical property after table 2 is forged
As shown in fig. 7, grain size detects after forging, grain grade is not more than 5.5 grades, meets the requirements.
The above is only embodiments of the present invention, it is noted that those of ordinary skill in the art,
Without departing from the principles of the invention, several advantageous embodiments and retouching can also be made, these improvements and modifications also should be regarded as
Protection scope of the present invention.
Claims (10)
1. a kind of heat cladding forging method of cobalt-base alloys ingot, which is characterized in that by weight percentage, the chemistry of cobalt-base alloys
Ingredient: Cr28.0%~30%, Mo5.5%~6.5%, Ni, Fe, Mn, Nb, Si are respectively less than 0.1%, and O, C are respectively less than 0.05%,
N < 0.20%, Co surplus；It is coated using the asbestos of fire resisting containing zirconium, zirconium fire resisting asbestos will be contained before package and are layered on the ground, are waited high
Warm forging base is wrapped up after coming out of the stove；When cobalt-base alloys forging stock shove charge, for furnace temperature no more than 600 DEG C, heating rate cannot be too fast, small
In 50 DEG C/h, forging stock is first heated to 1150 DEG C~1250 DEG C, package of coming out of the stove after keeping the temperature 1~3 hour；Continuation is melted down after package to exist
After 1150 DEG C~1250 DEG C keep the temperature 1~3 hour, forging of coming out of the stove.
2. the heat cladding forging method of cobalt-base alloys ingot described in accordance with the claim 1, which is characterized in that without upsetting when forging and stamping
Thick operation.
3. the heat cladding forging method of cobalt-base alloys ingot described in accordance with the claim 1, which is characterized in that alloy before every fire time is forged
Ingot will sufficiently be kept the temperature, i.e., will melt down by the forging stock of upper one heat forging and be heated to require temperature, be gone out after reaching soaking time
Furnace wraps up, and melts down heat preservation again after package, the soaking time for reaching requirement is come out of the stove again carries out lower one heat forging.
4. the heat cladding forging method of cobalt-base alloys ingot described in accordance with the claim 1, which is characterized in that last one heat forging
Blank holding temperature is 1150 DEG C, and soaking time was controlled at 1~2 hour.
5. the heat cladding forging method of cobalt-base alloys ingot described in accordance with the claim 1, which is characterized in that shorten after coming out of the stove as far as possible
To the time interval of forging chopping block, avoid blank temperature drop too many.
6. the heat cladding forging method of cobalt-base alloys ingot described in accordance with the claim 1, which is characterized in that the end of every fire time blank
Forging temperature cannot be below 1020 DEG C.
7. the heat cladding forging method of cobalt-base alloys ingot described in accordance with the claim 1, which is characterized in that the change of every fire time forging
Shape amount wants the requirement of duplex forging technique.
8. the heat cladding forging method of cobalt-base alloys ingot described in accordance with the claim 1, which is characterized in that real-time measurement when forging
Forging stock temperature.
9. the heat cladding forging method of cobalt-base alloys ingot described in accordance with the claim 1, which is characterized in that by last fire
Forging stock after forging is diffused annealing at 1020 DEG C~1050 DEG C, and soaking time was at 1~2 hour.
10. the heat cladding forging method of cobalt-base alloys ingot described in accordance with the claim 1, which is characterized in that the asbestos of fire resisting containing zirconium
In, the weight content of zirconium oxide is 15%~16%.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110129591A (en) * | 2019-06-03 | 2019-08-16 | 凯里学院 | The production method of joint prosthesis CoCrMo alloy |
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| CN110129591A (en) * | 2019-06-03 | 2019-08-16 | 凯里学院 | The production method of joint prosthesis CoCrMo alloy |
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Application publication date: 20190531 |