CN113667915A - Treatment method for improving fatigue life of titanium alloy by using pulsed magnetic field treatment - Google Patents
Treatment method for improving fatigue life of titanium alloy by using pulsed magnetic field treatment Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
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- B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
- B22F10/60—Treatment of workpieces or articles after build-up
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention discloses a processing method for improving the fatigue life of titanium alloy by using pulsed magnetic field processing, which utilizes the instantaneous high-energy pulse action of a pulsed magnetic field to release internal residual stress by micro-scale adjustment of a part matrix structure on the premise of ensuring the dimensional precision of a part, thereby improving the microstructure and the stress state of the part and achieving the effect of improving the mechanical property of the part. The main process is that the titanium alloy part prepared by the additive manufacturing method is applied with 0-3T pulse magnetic field intensity, and the pulse frequency is controlled for 10-100 times, so that the internal participation stress of the titanium alloy part is reduced, and the fatigue performance is improved. The method can improve the internal stress state and defects of the titanium alloy in a short time, has a fast treatment process and good stability, does not deform and ensures the dimensional accuracy of the part. The treatment method provided by the invention has the advantages of simple process, easy operation, excellent product performance and no pollution, and meets the requirement of green production.
Description
Technical Field
The invention relates to the technical field of titanium alloy performance improvement, in particular to a processing method for improving the fatigue life of a titanium alloy by using pulsed magnetic field processing.
Background
The titanium alloy has the advantages of high specific strength, excellent corrosion resistance, good biocompatibility and the like, and is popularized and applied in the fields of medical treatment, aerospace and the like. In recent years, the additive manufacturing technology is continuously developed, the production cycle of titanium alloy parts is shortened, and the demand of the fields for the titanium alloy parts is gradually increased. However, the prepared parts often have defects such as a large number of pores and vacancies, a large number of stresses are accumulated, the parts are easy to deform and crack seriously, the titanium alloy has poor heat conductivity, and a large temperature gradient is formed in additive manufacturing, so that the organization structure is in a lath shape and is not uniformly distributed, and the service energy is seriously influenced. How to carry out post-treatment on the titanium alloy material prepared by additive manufacturing becomes one of the important contents of domestic and foreign research. The existing post-treatment methods at home and abroad mainly comprise heat treatment methods such as stress relief annealing, solid solution strengthening, hot isostatic pressing and the like, and surface treatment methods such as shot blasting, electrolytic polishing, Ultrasonic Nanocrystalline Surface Modification (UNSM), Ultrasonic Surface Mechanical Abrasion (USMAT) and the like. Although the material defects can be eliminated to a certain extent and the stress distribution state can be improved, the traditional heat treatment and the hot isostatic pressing take long time, and the traditional heat treatment has the defects of high cost, environmental pollution and the like. In addition, the surface treatment technology can not eliminate the internal defects of the material, is not suitable for modifying parts with complex shapes, and has the problem that a strengthening layer is difficult to effectively control.
In recent years, pulsed electromagnetic field treatment is gradually developed as a post-treatment technology for additive manufacturing of titanium alloy, and Zhouyijun et al (patent No.: ZL CN 110527937A) invents a method for treating 3D printed matter by adopting electric pulses, so that the porosity of the additive manufacturing titanium alloy is reduced, and the elongation is obviously improved. The pulse magnetic field treatment for 3D printing of the titanium alloy is rarely reported at present, and although the pulse magnetic field has been found at home and abroad to have a good treatment effect on the titanium alloy prepared by the traditional process, the strength and the plasticity are effectively improved. However, the research and the results of the pulsed magnetic field treatment for the additive manufacturing of the titanium alloy are very few at present, and particularly, the research and the results are in the fields of improving the residual stress of parts and prolonging the fatigue life. Therefore, a new treatment process is needed to fully utilize the technical advantages of the manufacturing technology and the pulsed magnetic field, and to realize high-quality application of titanium alloy.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a processing method for improving the fatigue life of a titanium alloy by using pulsed magnetic field processing, which can improve the microstructure of a part, eliminate defects, improve comprehensive mechanical properties, improve the fatigue life of the titanium alloy part manufactured by additive manufacturing by performing post-processing on the titanium alloy metal part manufactured by additive manufacturing on the premise of not causing material phase change in a short time and ensuring the dimensional precision and surface quality of the part, and solves the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme: a treatment method for improving the fatigue life of titanium alloy by using pulsed magnetic field treatment comprises the following steps:
s1, selecting titanium alloy metal powder with the powder particle size of 45-105 mu m;
s2, preparing a titanium alloy blank by adopting an additive manufacturing technology;
s3, machining the prepared titanium alloy blank to obtain a standard tensile sample;
s4, fixing the standard tensile sample in a magnetic field generating device by using a clamp, and setting magnetic field processing parameters;
and S5, starting the pulse magnetic field, and finishing the pulse magnetic field treatment on the standard tensile sample.
Preferably, the components of the titanium alloy metal powder in the step S1 meet the requirements of GB/T3620.1-2016 on the components of titanium alloy grades.
Preferably, the additive manufacturing technique in step S2 includes SLS, FDM, or SLM.
Preferably, the additive manufacturing technique is SLM.
Preferably, the machining is carried out according to the national standard GB/T228.1-2010.
Preferably, the clamp in step S4 is made of a general high molecular polymer material, and has good insulation and extremely low magnetic permeability, and no other metal interference material exists in the range of the pulsed magnetic field processing during the fixing process.
Preferably, the selection criterion of the parameters in the set magnetic field processing parameters is based on the improvement target of the residual stress of the sample, and the product of the pulse magnetic field intensity and the pulse magnetic field processing times is 95-105% of the reduction amount of the residual stress.
Preferably, in the magnetic field treatment parameters, the pulse magnetic field intensity is 0-3T, and the pulse magnetic field treatment times are 10-100.
Preferably, the surface temperature of the sample is less than or equal to 160 ℃ when the pulsed magnetic field is activated in the step S5.
The invention has the beneficial effects that:
1) the method only utilizes the pulse magnetic field to carry out modification treatment on the titanium alloy parts for additive manufacturing, has low energy consumption, short treatment time and high efficiency, does not need further surface pretreatment process, has simple steps, and can carry out batch rapid treatment on small-size and small-batch parts.
2) In the process of the pulsed magnetic field treatment, almost no thermal effect is generated, the treatment platform is not in physical contact with a sample to be treated, the surface of the sample is not oxidized and the material is not subjected to phase change due to the action of the thermal effect or contact force, and the geometric precision of the sample is not changed.
3) The resistance change rate of the titanium alloy part is not more than 0.5 percent before and after the treatment, and the conductivity of the titanium alloy part is not influenced; the change of the tensile strength and the yield strength of the titanium alloy part is not more than 1 percent, but the elongation can be improved by more than 10 percent; the microstructure is changed from partial lath shape into spherical shape and polygonal shape and is staggered; improved residual stress and fatigue life cycle of 1.24x105Lifting to 7.08x105The fatigue performance is improved, and the target effect can be achieved; the pulsed magnetic field treatment can comprehensively improve the fatigue life of the titanium alloy parts.
Drawings
FIG. 1 is a schematic flow chart of the process of the present invention;
FIG. 2 is a microstructure of a sample of example 1 of the present invention before being subjected to a pulsed magnetic field treatment;
FIG. 3 is a microstructure of a sample of example 1 of the present invention after a pulsed magnetic field treatment;
FIG. 4 is a diagram showing the residual stress state of the sample of example 1 before and after the pulsed magnetic field treatment;
fig. 5 is a schematic view of the components of a bone plate sample according to embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
As shown in fig. 1, is a flow step of the entire processing method. Firstly, preparing a titanium alloy sample, selecting proper TC4 titanium alloy powder according to GB/T3620.1-2016, wherein the particle size of the powder is 45-105 microns, the main components of the powder are titanium, aluminum and vanadium, preparing a titanium alloy blank by adopting a selective laser melting method (SLM), and mechanically processing the titanium alloy blank according to GB/T228.1-2010 to prepare a standard tensile sample.
Preparing a metallographic specimen of a standard tensile specimen, obtaining an initial microstructure of the metallographic specimen as shown in fig. 2, comparing the microstructure before and after processing, detecting to obtain an initial residual stress state of the metallographic specimen, comparing the residual stress state before and after processing, and simultaneously, reserving a part of metallographic specimen for comparing the fatigue life performance.
The sample is fixed in the magnetic field generating equipment by the clamp, the clamp is made of PTFE, has good insulativity and extremely low magnetic conductivity, can fully fix the sample to be processed, and does not influence the processing effect of the pulsed magnetic field.
When the sample is completely fixed, the stability and the reliability of sample treatment are ensured according to the initial residual stress state of the sample of-97 MPa, -19MPa, -115MPa, the target improvement profit participation state is-40 MPa, therefore, the sample is subjected to pulsed magnetic field treatment by adopting the pulsed magnetic field intensity of 2T and the pulse treatment times of 20 times, and the microstructure after the pulsed magnetic field treatment is shown in figure 3.
Starting a pulse magnetic field, determining that the surface temperature of a sample does not exceed 160 ℃ in the treatment process, wherein no ferromagnetic substance is interfered in the range of the pulse magnetic field of a treated part, finishing the pulse magnetic field treatment of the sample after the waiting time is over, and performing near-in-situ repeated test on the sample subjected to the residual stress test, wherein the residual stress state before and after the pulse magnetic field treatment is shown in figure 4, and the residual stress state of the sample is-135 MPa, -49MPa, -156MPa after the detection, so that the compressive stress of about 30-45 is increased, and the fatigue life is prolonged.
In addition, other control groups are selected for fatigue life test, the fatigue life after pulse magnetic field treatment is compared as shown in the following table,
| processing method | Stress level (Mpa) | Fatigue life |
| Before treatment | 250 | 1.24x105 |
| After treatment | 250 | 7.08x105 |
(comparison of fatigue Life after pulsed magnetic field treatment)
The test comparison shows that the fatigue life cycle of the sample is from 1.24x10 at the fatigue load of 250MPa5Lifting to 7.08x105The fatigue performance is improved. The detection of the microstructure shows that the lath-shaped microstructure in the initial microstructure of the titanium alloy part manufactured by the additive is converted into spherical and polygonal staggered distribution after coupling treatment, a certain amount of beta phase is precipitated in the alpha phase, and the new substances reduce the slip resistance during stretching, so that the fatigue limit of the material is improved, and the fatigue life of the titanium alloy is prolonged.
Example 2
As shown in fig. 1, is a flow step of the entire processing method. Firstly, preparing a titanium alloy part, selecting proper TC4 titanium alloy powder according to GB/T3620.1-2016, wherein the particle size of the powder is 45-105 mu m, the main components of the powder are titanium, aluminum and vanadium, preparing a titanium alloy part blank by adopting a Selective Laser Melting (SLM) method, and preparing the part for detection according to a certain type of titanium alloy bone fracture plate, wherein the schematic diagram of the titanium alloy bone fracture plate is shown in FIG. 5. According to the use requirements in practical application and achieving good treatment effect and reliable performance improvement, firstly, the titanium alloy bone fracture plate blank is subjected to plasma polishing treatment, and then pulsed magnetic field treatment is carried out. It should be noted that the bone fracture plate product adopted here is a common application product in practical application, and does not represent that the pulsed magnetic field technology provided by the present invention is only effective for the product, and meanwhile, the plasma polishing treatment is a process step adopted in the production of titanium alloy bone fracture plates to meet the use requirements, and does not represent that the pulsed magnetic field technology provided by the present invention can only achieve the performance improvement under the premise that the plasma polishing process exists.
The bone fracture plate is fixed in the magnetic field generating equipment by the fixture, the fixture is made of PTFE (polytetrafluoroethylene), has good insulativity and extremely low magnetic conductivity, can fully fix a sample to be treated, and does not influence the treatment effect of the pulsed magnetic field.
When the sample is completely fixed, three data points are obtained from the bone fracture working positions of the bone fracture plate according to the initial residual stress state of the sample of-37 MPa, -28 MPa-13 MPa, the three results are taken to ensure the stability and the reliability of sample treatment, and the target improvement profit participation state is-30 MPa, so that the sample is subjected to pulsed magnetic field treatment by adopting the pulsed magnetic field strength of 1.5T and the pulse treatment times of 20 times.
Starting a pulse magnetic field, determining that the surface temperature of the sample does not exceed 160 ℃ in the treatment process, no ferromagnetic substance interference exists in the range of the pulse magnetic field of the treated part, finishing the treatment of the pulse magnetic field of the sample after the waiting time is over, performing fatigue performance tests on the treated sample and an untreated sample for reference, comparing the fatigue life after the pulse magnetic field treatment as shown in the following table,
(comparison of fatigue Life after pulsed magnetic field treatment)
The test comparison shows that the fatigue life cycle of the sample is from 1.24x10 at the fatigue load of 250MPa5Lifting to 1.53x105At a fatigue load of 200MPa, the fatigue life cycle of the sample was from 2.89X105Lifting to 9.32x105The fatigue performance is improved.
On the premise of ensuring the dimensional accuracy of the part, the method releases the internal residual stress by utilizing the instantaneous high-energy pulse action of the pulsed magnetic field and carrying out micro-scale adjustment on the matrix structure of the part, thereby improving the microstructure and the stress state of the part and achieving the effect of improving the mechanical property of the part. The main process is that the titanium alloy part prepared by the additive manufacturing method is applied with 0-3T pulse magnetic field intensity, and the pulse frequency is controlled for 10-100 times, so that the internal participation stress of the titanium alloy part is reduced, and the fatigue performance is improved. The method can improve the internal stress state and defects of the titanium alloy in a short time, has a fast treatment process and good stability, does not deform and ensures the dimensional accuracy of the part.
Although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes in the embodiments and/or modifications of the invention can be made, and equivalents and modifications of some features of the invention can be made without departing from the spirit and scope of the invention.
Claims (9)
1. A treatment method for improving the fatigue life of titanium alloy by using pulsed magnetic field treatment is characterized by comprising the following steps:
s1, selecting titanium alloy metal powder with the powder particle size of 45-105 mu m;
s2, preparing a titanium alloy blank by adopting an additive manufacturing technology;
s3, machining the prepared titanium alloy blank to obtain a standard tensile sample;
s4, fixing the standard tensile sample in a magnetic field generating device by using a clamp, and setting magnetic field processing parameters;
and S5, starting the pulse magnetic field, and finishing the pulse magnetic field treatment on the standard tensile sample.
2. The method of claim 1, wherein the pulsed magnetic field treatment is used to improve the fatigue life of the titanium alloy, and the method comprises the following steps: the components of the titanium alloy metal powder in the step S1 meet the component requirements of GB/T3620.1-2016 on titanium alloy grades.
3. The method of claim 1, wherein the pulsed magnetic field treatment is used to improve the fatigue life of the titanium alloy, and the method comprises the following steps: the additive manufacturing technique in step S2 includes SLS, FDM, or SLM.
4. The method of claim 3, wherein the pulsed magnetic field treatment is used to improve the fatigue life of the titanium alloy, and the method comprises the following steps: the additive manufacturing technique is SLM.
5. The method of claim 1, wherein the pulsed magnetic field treatment is used to improve the fatigue life of the titanium alloy, and the method comprises the following steps: the mechanical processing is carried out according to the national standard GB/T228.1-2010.
6. The method of claim 1, wherein the pulsed magnetic field treatment is used to improve the fatigue life of the titanium alloy, and the method comprises the following steps: the clamp in the step S4 is made of a general high molecular polymer material, has good insulation and extremely low magnetic permeability, and no other metal interference material exists in the pulse magnetic field processing range during the fixing process.
7. The method of claim 1, wherein the pulsed magnetic field treatment is used to improve the fatigue life of the titanium alloy, and the method comprises the following steps: the selection standard of parameters in the set magnetic field processing parameters is based on the improvement target of the residual stress of the sample, and the product of the pulse magnetic field intensity and the pulse magnetic field processing times is 95-105% of the reduction amount of the residual stress.
8. The method of claim 1, wherein the pulsed magnetic field treatment is used to improve the fatigue life of the titanium alloy, and the method comprises the following steps: in the magnetic field treatment parameters, the intensity of the pulse magnetic field is 0-3T, and the treatment times of the pulse magnetic field are 10-100 times.
9. The method of claim 1, wherein the pulsed magnetic field treatment is used to improve the fatigue life of the titanium alloy, and the method comprises the following steps: and the surface temperature of the sample is less than or equal to 160 ℃ when the pulse magnetic field is started in the step S5.
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Effective date of registration: 20220118 Address after: 610000 floor 3, No. 2-305, tongshunqiao street, Qingyang District, Chengdu, Sichuan Applicant after: Chengdu Kunwu Technology Co.,Ltd. Address before: 610064, No. 24, south section of Ring Road, Sichuan, Chengdu Applicant before: SICHUAN University |
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| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20211119 |