CN112779486A - Method for improving fatigue performance of magnesium alloy under asymmetric stress working condition - Google Patents
Method for improving fatigue performance of magnesium alloy under asymmetric stress working condition Download PDFInfo
- Publication number
- CN112779486A CN112779486A CN202011558113.5A CN202011558113A CN112779486A CN 112779486 A CN112779486 A CN 112779486A CN 202011558113 A CN202011558113 A CN 202011558113A CN 112779486 A CN112779486 A CN 112779486A
- Authority
- CN
- China
- Prior art keywords
- stress
- magnesium alloy
- sample
- tensile
- electric field
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910000861 Mg alloy Inorganic materials 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 38
- 125000004122 cyclic group Chemical group 0.000 claims abstract description 69
- 230000005684 electric field Effects 0.000 claims abstract description 48
- 238000007906 compression Methods 0.000 claims abstract description 39
- 238000009661 fatigue test Methods 0.000 claims abstract description 18
- 230000008569 process Effects 0.000 claims abstract description 7
- 230000036316 preload Effects 0.000 claims abstract 3
- 238000012545 processing Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 44
- 239000000956 alloy Substances 0.000 abstract description 11
- 230000000694 effects Effects 0.000 abstract description 10
- 239000013078 crystal Substances 0.000 abstract description 4
- 238000011160 research Methods 0.000 description 4
- 238000005728 strengthening Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000005480 shot peening Methods 0.000 description 3
- 230000000376 effect on fatigue Effects 0.000 description 2
- 239000002052 molecular layer Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000003313 weakening effect Effects 0.000 description 1
Images
Classifications
-
- 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
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon
Landscapes
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
本发明公开了一种提高镁合金非对称应力工况疲劳性能的方法，将镁合金制备成易于疲劳试验机夹持的样品，利用疲劳试验机，在室温20℃～30℃环境下对上述样品采用低于屈服极限的拉‑压循环应力载荷进行一次预加载，一次预加载后的样品采用高于屈服极限的拉‑压循环应力载荷进行过载处理，过载处理后的样品采用低于屈服极限的拉‑压循环应力载荷进行二次预加载，然后将样品置于脉冲电场中利用脉冲电流对样品进行处理，完成对镁合金样品的处理。本发明基于瞬时过载，在镁合金材料内部形成残余压应力，抵消非对称应力工况棘轮效应的影响，同时利用脉冲电流恢复及提高材料韧性及进一步细化材料晶粒，提高材料非对称应力工况下的疲劳性能。
The invention discloses a method for improving the fatigue performance of magnesium alloy under asymmetric stress conditions. The magnesium alloy is prepared into a sample that is easy to be clamped by a fatigue testing machine, and the above-mentioned sample is tested by the fatigue testing machine at a room temperature of 20°C to 30°C. The tensile-compression cyclic stress load below the yield limit was used for one preloading, and the samples after one preload were subjected to overload treatment with the tensile-compression cyclic stress load above the yield limit. The tensile-compression cyclic stress load is used for secondary preloading, and then the sample is placed in a pulsed electric field to process the sample with a pulsed current to complete the treatment of the magnesium alloy sample. Based on the instantaneous overload, the invention forms residual compressive stress inside the magnesium alloy material, offsets the influence of the ratchet effect of the asymmetric stress condition, and at the same time utilizes the pulse current to restore and improve the toughness of the material and further refine the crystal grains of the material, so as to improve the workability of the asymmetric stress of the material. fatigue performance under conditions.
Description
Technical Field
The invention belongs to the technical field of magnesium alloy material performance, and relates to a method for improving the fatigue performance of a magnesium alloy under an asymmetric stress working condition.
Technical Field
In recent years, due to the large number of applications of magnesium alloys in the fields of automobiles, aerospace and the like, researches on how to improve the fatigue properties of magnesium alloys have been receiving wide attention. At present, researches for improving fatigue performance of magnesium alloy focus on grain refinement, surface strengthening and the like in materials, methods such as rare earth element addition, heat treatment, pre-deformation, shot peening strengthening and the like are mainly used, and the researches on fatigue performance and the like under actual working conditions are less.
In actual working conditions, the magnesium alloy part bears the action of asymmetric cyclic stress load, besides fatigue load, the part also bears the influence of ratchet effect caused by average stress, and the fatigue life of the magnesium alloy is obviously reduced along with the accumulation of ratchet strain caused by the average stress. At present, few fatigue researches are carried out on the magnesium alloy under the working condition of asymmetric stress, a shot peening strengthening method is adopted to form a nano layer on the surface of a material, and the influence of ratchet effect on the fatigue performance under the asymmetric stress load is reduced by utilizing the residual compressive stress in the nano layer so as to improve the fatigue performance of the material.
In conclusion, for the improvement of the fatigue performance of the magnesium alloy under the asymmetric stress working condition, how to find an effective, simple and feasible process technical method to improve the fatigue performance of the magnesium alloy under the actual working condition has great significance for the popularization and the application of the magnesium alloy material.
Disclosure of Invention
Aiming at the fatigue performance of the existing magnesium alloy under the actual working condition, in particular to the condition of bearing asymmetric cyclic stress load, the invention provides a method for improving the fatigue performance of the magnesium alloy under the asymmetric stress working condition. The method is based on instantaneous overload, and forms residual compressive stress in the magnesium alloy material to offset the influence of ratchet effect on fatigue performance under the working condition of asymmetric stress load, and on the basis, pulse current is utilized to recover and improve the toughness of the material reduced by the instantaneous overload, and simultaneously, material grains are further effectively refined, and the fatigue performance of the material under the working condition of asymmetric stress is effectively improved.
In order to solve the technical problems, the invention adopts the following technical scheme:
a method for improving the fatigue performance of magnesium alloy under asymmetric stress working condition includes preparing a sample easy to be clamped by a fatigue testing machine from magnesium alloy, pre-loading the sample by a tensile-compression cyclic stress load lower than a yield limit at room temperature of 20-30 ℃ by using the fatigue testing machine, carrying out overload treatment on the sample subjected to the pre-loading by the tensile-compression cyclic stress load higher than the yield limit, carrying out secondary pre-loading on the sample subjected to the overload treatment by the tensile-compression cyclic stress load lower than the yield limit, and then processing the sample by pulse current in a pulse electric field to finish the treatment of the magnesium alloy sample.
As a preferable scheme of the invention, the pulse electric field is a square wave pulse electric field; the initial voltage of the pulse electric field is 0, and the peak voltage is 5 kV-15 kV; the pulse duty ratio of the pulse electric field is 0.1-0.25; the electric field frequency of the pulse electric field is 10 Hz-50 Hz.
In a preferred embodiment of the present invention, the sample is treated in a pulsed electric field with a pulsed current for 0.5-2 seconds.
As a preferable scheme of the invention, the magnesium alloy sample is subjected to primary preloading by using a tensile-compression cyclic stress load lower than the yield limit by using a fatigue testing machine, the loading frequency of the tensile-compression cyclic stress load is 5 Hz-20 Hz, the maximum stress in the tensile-compression cyclic stress load is 5% -10% of the yield limit, the stress ratio is 0, and the cycle number of the primary preloading is 1000-2000 weeks.
As a preferable scheme of the invention, the magnesium alloy sample after primary preloading is subjected to overload treatment by using a fatigue testing machine by adopting a tensile-compressive cyclic stress load higher than the yield limit, the loading frequency of the tensile-compressive cyclic stress load is 1 Hz-3 Hz, the maximum stress in the tensile-compressive cyclic stress load is 105% -115% of the yield limit, the stress ratio is 0, and the cycle number of the overload treatment is 1-3 weeks.
As a preferable scheme of the invention, the magnesium alloy sample after overload treatment is subjected to secondary preloading by using a fatigue testing machine by adopting a tensile-compressive cyclic stress load lower than the yield limit, the loading frequency of the tensile-compressive cyclic stress load is 5 Hz-20 Hz, the maximum stress in the tensile-compressive cyclic stress load is 10% -20% of the yield limit, the stress ratio is 0, and the cycle frequency of the secondary preloading is 2000-5000 cycles.
In the invention, the magnesium alloy material which is subjected to primary preloading by adopting the pull-press cyclic stress load lower than the yield limit is subjected to instantaneous overload treatment, then the pull-press cyclic stress load lower than the yield limit is subjected to secondary preloading, and then the magnesium alloy material is treated by utilizing pulse current. The invention has the following beneficial effects.
1) The invention utilizes the instantaneous overload method to form residual compressive stress with corresponding degree in the material, can effectively offset the influence of the ratchet effect on the fatigue performance under the working condition of asymmetric stress load, and improves the fatigue performance under the working condition of asymmetric stress of the material.
2) According to the invention, the tension-compression cyclic stress load lower than the yield limit is adopted for preloading before and after instantaneous loading, so that the uniformity of the internal structure of the material can be effectively improved, the residual compressive stress generated by the instantaneous loading is uniformly distributed in the material, the effectiveness of the residual compressive stress on the ratchet effect offset is improved, and the fatigue performance of the material under the working condition of asymmetric stress is effectively enhanced. In addition, the tensile-compression cyclic stress load lower than the yield limit is adopted for preloading, so that the material grains can be effectively refined, and the material fatigue strength can be improved.
3) The magnesium alloy material after instantaneous overload is treated by using the pulse current, so that the toughness of the material reduced by the instantaneous overload can be effectively recovered and improved, the crystal grains of the material can be further refined, and the fatigue performance of the material under the working condition of asymmetric stress can be effectively improved.
4) Compared with the traditional shot peening strengthening process, the method has simple and easy process, can fully and effectively counteract the weakening of the ratchet effect on the fatigue performance, simultaneously can effectively avoid the reduction of the toughness of the material, can fully and effectively refine the grains of the material, effectively improves the fatigue performance of the material under the working condition of asymmetric stress, and has very obvious overall technical and economic advantages.
Drawings
FIG. 1 is a schematic flow chart of the present invention.
Detailed Description
The invention is described in further detail below with reference to the figures and the detailed description.
As shown in FIG. 1, a method for improving the fatigue performance of magnesium alloy under asymmetric stress working conditions comprises the following steps:
1) preparing a magnesium alloy into a sample which is easy to clamp by a fatigue testing machine, performing primary preloading on the sample by using a pull-press cyclic stress load lower than the yield limit at the room temperature of 20-30 ℃ by using the fatigue testing machine, performing overload treatment on the sample subjected to the primary preloading by using the pull-press cyclic stress load higher than the yield limit, performing secondary preloading on the sample subjected to the overload treatment by using the pull-press cyclic stress load lower than the yield limit, and then placing the sample in a pulse electric field to treat the sample by using pulse current to complete the treatment on the magnesium alloy sample. The pulse electric field for processing the magnesium alloy sample is a square wave pulse electric field; the initial pulse voltage of the pulse electric field is 0, and the peak voltage is 5 kV-15 kV; the pulse duty ratio of the pulse electric field is 0.1-0.25; the electric field frequency of the pulse electric field is 10 Hz-50 Hz; and (3) placing the magnesium alloy sample in a pulse electric field, and treating the sample by using pulse current, wherein the treatment time is 0.5-2 seconds.
2) In the step 1), the loading frequency of the primary preloaded tensile-compression cyclic stress load is 5Hz to 20Hz, the maximum stress of the primary preloaded tensile-compression cyclic stress load is 5 percent to 10 percent of the yield limit, the stress ratio is 0, and the cycle frequency of the primary preloading is 1000 to 2000 cycles.
3) In the step 1), the loading frequency of the overload treatment pull-press cyclic stress load is 1Hz to 3Hz, the maximum stress of the overload treatment pull-press cyclic stress load is 105 percent to 115 percent of the yield limit, the stress ratio is 0, and the number of overload treatment cycles is 1 to 3 weeks.
4) In the step 1), the loading frequency of the secondary pre-loaded tensile-compression cyclic stress load is 5Hz to 20Hz, the maximum stress of the secondary pre-loaded tensile-compression cyclic stress load is 10 percent to 20 percent of the yield limit, the stress ratio is 0, and the cycle frequency of the primary pre-loading is 2000 to 5000 cycles.
Based on instantaneous overload, the invention forms residual compressive stress in the magnesium alloy material to offset the influence of ratchet effect on fatigue performance under the working condition of asymmetric stress load, and in addition, the invention adopts a low-stress preloading method to refine material crystal grains and improve the uniformity of internal structure of the material before and after the instantaneous loading, so that the residual compressive stress generated by the instantaneous loading is uniformly distributed in the material, the effectiveness of the material on the offset of the ratchet effect is improved, on the basis, pulse current is utilized to recover and improve the toughness of the material reduced by the instantaneous overload, meanwhile, the material crystal grains are further effectively refined, and the fatigue performance of the material under the working condition of asymmetric stress is effectively improved. The method has simple and easy process and obvious overall technical and economic advantages.
Example 1
A method for improving the fatigue performance of magnesium alloy under the asymmetric stress working condition comprises the following steps:
1) preparing a magnesium alloy into a sample which is easy to clamp by a fatigue testing machine, performing primary preloading on the sample by using a pull-press cyclic stress load lower than the yield limit at the room temperature of 20 ℃, performing overload treatment on the sample subjected to primary preloading by using a pull-press cyclic stress load higher than the yield limit, performing secondary preloading on the sample subjected to overload treatment by using the pull-press cyclic stress load lower than the yield limit, and then placing the sample in a pulse electric field to treat the sample by using pulse current to finish the treatment on the magnesium alloy sample. The pulse electric field for processing the magnesium alloy sample is a square wave pulse electric field; the initial voltage of the pulse electric field is 0, and the peak voltage is 5 kV; the pulse duty ratio of the pulse electric field is 0.1; the electric field frequency of the pulse electric field is 10 Hz; and (3) placing the magnesium alloy sample in a pulse electric field, and treating the sample by using pulse current, wherein the treatment time is 0.5 second.
2) In the step 1), the loading frequency of the once preloaded tension-compression cyclic stress load is 5Hz, the maximum stress of the once preloaded tension-compression cyclic stress load is 5 percent of the yield limit, the stress ratio is 0, and the cycle number of the once preloading is 1000 cycles.
3) In the step 1), the loading frequency of the tensile-compressive cyclic stress load of the overload treatment is 1Hz, the maximum stress of the tensile-compressive cyclic stress load of the overload treatment is 105 percent of the yield limit, the stress ratio is 0, and the cycle number of the overload treatment is 1 week.
4) In the step 1), the loading frequency of the secondary pre-loading tensile-compression cyclic stress load is 5Hz, the maximum stress of the secondary pre-loading tensile-compression cyclic stress load is 10 percent of the yield limit, the stress ratio is 0, and the cycle number of the primary pre-loading is 2000 weeks.
The embodiment is based on instantaneous overload, residual compressive stress is formed in the magnesium alloy material to offset the influence of the ratchet effect on the fatigue performance under the working condition of asymmetric stress load, and simultaneously, a low-stress preloading method is adopted to refine material grains and improve the uniformity of internal tissues of the material before and after the instantaneous overload, so that on the basis, pulse current is utilized to recover and improve the toughness of the material reduced due to the instantaneous overload, the material grains are further effectively refined, and the fatigue performance of the material under the working condition of asymmetric stress is effectively improved. The method is simple and easy to implement, and has obvious advantages of the whole technology and the economy.
Example 2
A method for improving the fatigue performance of magnesium alloy under the asymmetric stress working condition comprises the following steps:
1) preparing a magnesium alloy into a sample which is easy to clamp by a fatigue testing machine, performing primary preloading on the sample at room temperature and 25 ℃ by using a tensile-compression cyclic stress load lower than the yield limit by using the fatigue testing machine, performing overload treatment on the sample subjected to the primary preloading by using a tensile-compression cyclic stress load higher than the yield limit, performing secondary preloading on the sample subjected to the overload treatment by using the tensile-compression cyclic stress load lower than the yield limit, then placing the sample in a pulse electric field, and treating the sample by using pulse current to complete the treatment on the magnesium alloy sample. The pulse electric field for processing the magnesium alloy sample is a square wave pulse electric field; the initial voltage of the pulse electric field is 0, and the peak voltage is 10 kV; the pulse duty ratio of the pulse electric field is 0.2; the electric field frequency of the pulse electric field is 30 Hz; and (3) placing the magnesium alloy sample in a pulse electric field, and treating the sample by using pulse current, wherein the treatment time is 1 second.
2) In the step 1), the loading frequency of the primary preloaded tensile-compression cyclic stress load is 15Hz, the maximum stress of the primary preloaded tensile-compression cyclic stress load is 7.5 percent of the yield limit, the stress ratio is 0, and the cycle number of the primary preloading is 1500 weeks.
3) In the step 1), the loading frequency of the tensile-compressive cyclic stress load of the overload treatment is 2Hz, the maximum stress of the tensile-compressive cyclic stress load of the overload treatment is 110 percent of the yield limit, the stress ratio is 0, and the cycle number of the overload treatment is 2 weeks.
4) In the step 1), the loading frequency of the tensile-compressive cyclic stress load of the secondary preloading is 15Hz, the maximum stress of the tensile-compressive cyclic stress load of the secondary preloading is 15 percent of the yield limit, the stress ratio is 0, and the cycle number of the primary preloading is 3500 cycles.
The embodiment is based on instantaneous overload, residual compressive stress is formed in the magnesium alloy material to offset the influence of the ratchet effect on the fatigue performance under the working condition of asymmetric stress load, and simultaneously, a low-stress preloading method is adopted to refine material grains and improve the uniformity of internal tissues of the material before and after the instantaneous overload, so that on the basis, pulse current is utilized to recover and improve the toughness of the material reduced due to the instantaneous overload, the material grains are further effectively refined, and the fatigue performance of the material under the working condition of asymmetric stress is effectively improved. The method is simple and easy to implement, and has obvious advantages of the whole technology and the economy.
Example 3
A method for improving the fatigue performance of magnesium alloy under the asymmetric stress working condition comprises the following steps:
1) preparing a magnesium alloy into a sample which is easy to clamp by a fatigue testing machine, performing primary preloading on the sample by using a pull-press cyclic stress load lower than the yield limit at the room temperature of 30 ℃, performing overload treatment on the sample subjected to primary preloading by using a pull-press cyclic stress load higher than the yield limit, performing secondary preloading on the sample subjected to overload treatment by using the pull-press cyclic stress load lower than the yield limit, and then placing the sample in a pulse electric field to treat the sample by using pulse current to finish the treatment on the magnesium alloy sample. The pulse electric field for processing the magnesium alloy sample is a square wave pulse electric field; the initial voltage of the pulse electric field is 0, and the peak voltage is 15 kV; the pulse duty ratio of the pulse electric field is 0.25; the electric field frequency of the pulse electric field is 50 Hz; and (3) placing the magnesium alloy sample in a pulse electric field, and treating the sample by using pulse current, wherein the treatment time is 2 seconds.
2) In the step 1), the loading frequency of the once preloaded tensile-compression cyclic stress load is 20Hz, the maximum stress of the once preloaded tensile-compression cyclic stress load is 10 percent of the yield limit, the stress ratio is 0, and the cycle number of the once preloading is 2000 weeks.
3) In the step 1), the loading frequency of the overload treatment pull-press cyclic stress load is 3Hz, the maximum stress of the overload treatment pull-press cyclic stress load is 115% of the yield limit, the stress ratio is 0, and the number of overload treatment cycles is 3 weeks.
4) In the step 1), the loading frequency of the secondary pre-loading tensile-compression cyclic stress load is 20Hz, the maximum stress of the secondary pre-loading tensile-compression cyclic stress load is 20 percent of the yield limit, the stress ratio is 0, and the cycle number of the primary pre-loading is 5000 cycles.
The embodiment is based on instantaneous overload, residual compressive stress is formed in the magnesium alloy material to offset the influence of the ratchet effect on the fatigue performance under the working condition of asymmetric stress load, and simultaneously, a low-stress preloading method is adopted to refine material grains and improve the uniformity of internal tissues of the material before and after the instantaneous overload, so that on the basis, pulse current is utilized to recover and improve the toughness of the material reduced due to the instantaneous overload, the material grains are further effectively refined, and the fatigue performance of the material under the working condition of asymmetric stress is effectively improved. The method is simple and easy to implement, and has obvious advantages of the whole technology and the economy.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (6)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011558113.5A CN112779486B (en) | 2020-12-24 | 2020-12-24 | Method for improving fatigue performance of magnesium alloy under asymmetric stress working condition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011558113.5A CN112779486B (en) | 2020-12-24 | 2020-12-24 | Method for improving fatigue performance of magnesium alloy under asymmetric stress working condition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112779486A true CN112779486A (en) | 2021-05-11 |
| CN112779486B CN112779486B (en) | 2021-11-09 |
Family
ID=75752354
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011558113.5A Active CN112779486B (en) | 2020-12-24 | 2020-12-24 | Method for improving fatigue performance of magnesium alloy under asymmetric stress working condition |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112779486B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339689A (en) * | 2021-06-15 | 2021-09-03 | 重庆工商大学 | Method for improving fatigue performance of dry-type thin oil sealed gas cabinet body |
| CN115452627A (en) * | 2022-10-10 | 2022-12-09 | 沈阳航空航天大学 | Method for determining loading frequency range of magnesium alloy component in engineering |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112827A (en) * | 2015-09-14 | 2015-12-02 | 重庆大学 | Method for refining crystalline grains of wrought magnesium alloy at room temperature |
| CN107130196A (en) * | 2017-05-24 | 2017-09-05 | 重庆工商大学 | A kind of new method for improving magnesium alloy lubricating oil operating mode fatigue behaviour |
| CN111411314A (en) * | 2020-05-15 | 2020-07-14 | 重庆工商大学 | A method for improving fatigue properties of magnesium alloys |
-
2020
- 2020-12-24 CN CN202011558113.5A patent/CN112779486B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105112827A (en) * | 2015-09-14 | 2015-12-02 | 重庆大学 | Method for refining crystalline grains of wrought magnesium alloy at room temperature |
| CN107130196A (en) * | 2017-05-24 | 2017-09-05 | 重庆工商大学 | A kind of new method for improving magnesium alloy lubricating oil operating mode fatigue behaviour |
| CN111411314A (en) * | 2020-05-15 | 2020-07-14 | 重庆工商大学 | A method for improving fatigue properties of magnesium alloys |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113339689A (en) * | 2021-06-15 | 2021-09-03 | 重庆工商大学 | Method for improving fatigue performance of dry-type thin oil sealed gas cabinet body |
| CN115452627A (en) * | 2022-10-10 | 2022-12-09 | 沈阳航空航天大学 | Method for determining loading frequency range of magnesium alloy component in engineering |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112779486B (en) | 2021-11-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Yang et al. | The effect of ultrasonic surface rolling process on the fretting fatigue property of GH4169 superalloy | |
| CN110343816B (en) | A method for modifying metal parts using electric, magnetic and electromagnetic coupled pulses | |
| CN112779486B (en) | Method for improving fatigue performance of magnesium alloy under asymmetric stress working condition | |
| Jiang et al. | Effects of shot-peening and re-shot-peening on four-point bend fatigue behavior of Ti–6Al–4V | |
| Reis et al. | Effect of artificial aging on the mechanical properties of an aerospace aluminum alloy 2024 | |
| CN112609068B (en) | Composite strengthening method for improving stress corrosion resistance of light alloy | |
| US20120160378A1 (en) | Preparation method of nanocrystalline titanium alloy at low strain | |
| Yang et al. | Effects of cold working and corrosion on fatigue properties and fracture behaviors of precipitate strengthened Cu-Ni-Si alloy | |
| Sanusi et al. | Experiment on Effect of heat treatment on mechanical and microstructure properties of AISI steel | |
| Gong et al. | Effect of aging state on fatigue property of wrought aluminum alloys | |
| Fakioglu et al. | Effects of different heat treatment conditions on fatigue behavior of AA7075 alloy | |
| CN105349923A (en) | Treatment process for shape memory alloy wire | |
| CN110592504B (en) | A heat treatment method for improving comprehensive properties of alloy sheet | |
| Xia et al. | Mechanical properties and corrosion behavior of a ZK60 magnesium alloy containing profuse twins and precipitates | |
| Rout et al. | Effect of interrupted ageing on stress corrosion cracking (SCC) behaviour of an Al-Zn-Mg-Cu alloy | |
| Chen et al. | Multi-scale characterization of deformation features and precipitation behavior in a near β-Ti alloy | |
| CN102051563B (en) | A aging process for 7075 aluminum alloy | |
| Zhang et al. | Effect of aging treatment on high temperature mechanical properties of a cast Al–Li–Cu alloy | |
| Yang et al. | Effects of aging temperature on microstructure and high cycle fatigue performance of 7075 aluminum alloy | |
| Chen et al. | Effect of a novel three-step aging on strength, stress corrosion cracking and microstructure of AA7085 | |
| Isadare et al. | Effect of As-Cast cooling on the microstructure and mechanical properties of agehardened 7000 Series aluminium alloy | |
| Wang et al. | Effects of a short-duration preprecipitation process prior to predeformation aging on the mechanical properties and corrosion resistance of Al-Cu-Mg-Ag alloy | |
| Hockauf et al. | Cyclic behavior and microstructural stability of ultrafine-grained AA6060 under strain-controlled fatigue | |
| Li et al. | Effect of aging on fracture toughness and stress corrosion cracking resistance of forged 7475 aluminum alloy | |
| RU2547984C1 (en) | Method of intensive plastic deformation by torsion under high cyclic pressure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |