CN111411314A - Method for improving fatigue property of magnesium alloy - Google Patents
Method for improving fatigue property of magnesium alloy Download PDFInfo
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- CN111411314A CN111411314A CN202010412315.2A CN202010412315A CN111411314A CN 111411314 A CN111411314 A CN 111411314A CN 202010412315 A CN202010412315 A CN 202010412315A CN 111411314 A CN111411314 A CN 111411314A
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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
- 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
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C26/00—Coating not provided for in groups C23C2/00 - C23C24/00
- C23C26/02—Coating not provided for in groups C23C2/00 - C23C24/00 applying molten material to the substrate
Abstract
The invention discloses a method for improving fatigue performance of magnesium alloy, which is characterized in that a fatigue testing machine is utilized to pre-load a magnesium alloy sample by adopting a tensile-compression cyclic stress load lower than the yield limit in a room environment; after preloading, putting the magnesium alloy sample into lubricating oil containing nano-grade high-furnace titanium slag as an additive for soaking treatment, and taking out after soaking for 2-4 hours; after the surface of the magnesium alloy sample is degreased, shot blasting strengthening treatment is carried out on the surface of the magnesium alloy sample. The method for improving the fatigue performance of the magnesium alloy can refine magnesium alloy grains and improve the fatigue strength of the material by adopting the technology of combining low stress cycle preloading with nano material surface repair, and meanwhile, the defects or the unevenness of the surface of the magnesium alloy material are subjected to surface repair by using the nano-grade high-furnace titanium slag, so that the corrosion of the magnesium alloy material under the working condition of lubricating oil can be effectively slowed or prevented, and the fatigue performance of the magnesium alloy material under the working condition of the lubricating oil is greatly improved.
Description
Technical Field
The invention belongs to the technical field of magnesium alloy, and particularly relates to a method for improving fatigue property of magnesium alloy.
Background
As a typical lightweight material, the magnesium alloy has the characteristics of low density, high strength and high rigidity, has wide application prospect in the fields of automobiles, aerospace, electronics, medicines and the like, and has wide market prospect. Based on the wide market application prospect of magnesium alloy, in recent years, how to improve the fatigue property of magnesium alloy to better adapt to various working conditions has become a research focus and a focus of the current magnesium alloy material.
At present, methods for improving the fatigue performance of magnesium alloy mainly adopt methods of rare earth element addition, heat treatment, predeformation, shot peening strengthening and the like, wherein the methods mainly focus on grain refinement inside or on the surface of the magnesium alloy so as to improve the fatigue performance of the magnesium alloy, have little influence on corrosive media in actual working conditions, and can not prevent the corrosive media in the actual working conditions from corroding the surface of the magnesium alloy. Although the fatigue performance of the magnesium alloy can be improved to a certain extent for the actual working conditions, the method has the condition that corrosive media exist for the actual working conditions, such as CO in the air when the moisture content is larger2Cl in acid rain and aqueous environment-And the method has limited improvement on the fatigue property of the magnesium alloy.
Aiming at the corrosion resistance of the magnesium alloy, the physical stability of the blast furnace titanium slag is researched and utilized, and the nano-grade blast furnace titanium slag is adopted as a lubricating oil additive to repair the defects or the unevenness of the surface of the material to form a corresponding self-repairing film so as to improve the corrosion resistance of the surface of the magnesium alloy. The method is low in cost, and meanwhile, the formed repair film has an anti-corrosion effect, but the repair film is formed only by adsorption of the nano-grade high-furnace titanium slag on the surface of the magnesium alloy, the bonding degree of the repair film and the surface of the magnesium alloy is not enough, and when the repair film bears a fatigue load (repeated action of alternating load), the repair film is easy to fall off to form a weak link, so that the fatigue performance is reduced.
In conclusion, for the improvement of the fatigue performance of the magnesium alloy, how to find an effective, simple, convenient and feasible process technical method with lower cost so as to improve the fatigue performance of the magnesium alloy under the actual working condition, especially under the condition that corrosive media exist in the actual working condition, has great significance for the popularization and application of the magnesium alloy material.
Disclosure of Invention
In view of the above, the present invention provides a method for improving fatigue properties of a magnesium alloy, which can effectively improve corrosion resistance, wear resistance and fatigue properties of the material.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for improving the fatigue property of magnesium alloy, utilize fatigue testing machine to adopt under the room temperature environment to pull-press the cyclic stress load of the yield limit to carry on the preloading to the magnesium alloy sample;
after preloading, putting the magnesium alloy sample into lubricating oil containing nano-grade high-furnace titanium slag as an additive for soaking treatment, and taking out after soaking for 2-4 hours;
after the surface of the magnesium alloy sample is degreased, shot blasting strengthening treatment is carried out on the surface of the magnesium alloy sample.
Further, the surface roughness of the magnesium alloy sample is 0.2 to 0.8.
Further, the acid value of the lubricating oil is 0.1mgKOH/g or less.
Further, the lubricating oil is a semi-synthetic lubricating oil or a fully synthetic lubricating oil.
Further, the granularity of the nano-grade high-furnace titanium slag is 10-50 nm.
Furthermore, the content of the nano-grade high furnace titanium slag is 0.5 to 1 percent of the mass of the lubricating oil.
Further, in the nano-grade high furnace titanium slag, TiO215-25% of SiO215 to 20 percent of Al2O3The mass content of (A) is 10-15%.
Furthermore, shot blasting shots adopted in the shot blasting strengthening process are ceramic shots; the diameter of the ceramic pill is 0.6-0.85mm, the shot blasting speed is 10-30m/s, the vibration frequency of a shot blasting vibrator is 30-50Hz, the shot blasting time is 10-20 minutes, the distance from a nozzle to the surface of the sample is 50-100mm, the shot blasting angle is 90 degrees, and the shot blasting is vertical blasting.
Further, the maximum stress in the tensile-compression cyclic stress load when the fatigue testing machine is adopted to pre-load the magnesium alloy sample is 10% -20% of the yield limit, the stress ratio is 0, and the pre-loading cycle frequency is 5000 plus 10000 cycles.
The invention has the beneficial effects that:
the method for improving the fatigue property of the magnesium alloy adopts the tensile-compression cyclic stress load lower than the yield limit for preloading, so that the crystal grains can be refined, and the fatigue strength can be improved; the magnesium alloy sample which is pre-loaded by a tensile-compressive cyclic stress load lower than the yield limit is placed in lubricating oil containing nano-grade high-furnace titanium slag as an additive for soaking treatment, then the surface of the magnesium alloy sample is treated by a shot peening strengthening method, the instantaneous high temperature generated on the surface of the sample is strengthened by shot peening, the adsorption capacity of the nano-grade high-furnace titanium slag on the surface of the sample is greatly improved, the nano-grade high-furnace titanium slag is in a molten or semi-molten state, and an extremely compact and fine repair film is further formed on the surface of the material; in addition, the surface of the sample is processed by using a shot peening strengthening method, a magnesium alloy nano-layer with residual compressive stress is formed on the lower surface of the nano-grade high-furnace titanium slag repair film, and the fatigue performance and the wear resistance of the material can be effectively improved. The method has simple and easy process, the raw material of the nano-grade high-furnace titanium slag for surface repair belongs to solid waste recovery, the cost is lower, and the integral technical and economic advantages are very obvious.
Other technical effects of the invention are as follows:
(1) the blast furnace titanium slag is slag generated after the blast furnace smelting of the vanadium titano-magnetite, the mineral phases are complex, the main mineral phases are perovskite, Panti diopside, rich-Ti diopside and magnesia-alumina spinel, and the chemical property is stable and is insoluble in general acid and alkali. In the invention, the repair film formed by the nano-grade high-furnace titanium slag is compared with nano-copper and nano-TiO2The magnesium alloy material has the advantages of being more stable and stronger in corrosion resistance, being capable of effectively enhancing the fatigue performance of the magnesium alloy material in the presence of corrosive media under actual working conditions, and having obvious cost advantage.
(2) The stress ratio of the tensile-compressive cyclic stress load is 0 (i.e., the minimum stress is 0, and the stress is completely unloaded in each cycle), so that instability in the preloading process and material damage caused by residual stress in each cycle can be avoided. In addition, after cyclic stress load preloading, defects or irregularities on the surface of the magnesium alloy material are more fully exposed, at the moment, the magnesium alloy material is placed in lubricating oil containing nano-grade high-furnace titanium slag as an additive for soaking treatment, and the adsorption of the nano-grade high-furnace titanium slag on the defects or irregularities on the surface of the material is more fully, so that the formation of a subsequent nano-grade high-furnace titanium slag repairing film is facilitated.
(3) The shot peening strengthening can form a nano layer with a nano-grade high furnace titanium slag repairing film on the surface of the magnesium alloy, and effectively improves the corrosion resistance, the wear resistance and the fatigue performance of the material by utilizing the physical stability of the high furnace titanium slag and the residual compressive stress in the nano layer. Meanwhile, the invention can also refine grains to further improve the fatigue strength of the material.
Drawings
In order to make the object, technical scheme and beneficial effect of the invention more clear, the invention provides the following drawings for explanation:
FIG. 1 is a process flow diagram of the method for improving the fatigue properties of magnesium alloys according to the present invention.
Detailed Description
The present invention is further described with reference to the following drawings and specific examples so that those skilled in the art can better understand the present invention and can practice the present invention, but the examples are not intended to limit the present invention.
FIG. 1 is a process flow chart of the method for improving the fatigue property of the magnesium alloy according to the invention. The method for improving the fatigue performance of the magnesium alloy comprises the following steps:
and preloading the magnesium alloy sample by using a tensile-compression cyclic stress load lower than the yield limit in a room temperature environment by using a fatigue testing machine. Specifically, the surface roughness of the magnesium alloy sample is 0.2 to 0.8. The maximum stress in the tensile-compression cyclic stress load when the fatigue testing machine is adopted to pre-load the magnesium alloy sample is 10-20% of the yield limit, the stress ratio is 0, and the pre-loading cycle number is 5000-10000 cycles. The stress ratio of the tensile-compressive cyclic stress load is 0 (i.e., the minimum stress is 0, and the stress is completely unloaded in each cycle), so that instability in the preloading process and material damage caused by residual stress in each cycle can be avoided. In addition, after cyclic stress load preloading, defects or irregularities on the surface of the magnesium alloy material are more fully exposed, at the moment, the magnesium alloy material is placed in lubricating oil containing nano-grade high-furnace titanium slag as an additive for soaking treatment, and the adsorption of the nano-grade high-furnace titanium slag on the defects or irregularities on the surface of the material is more fully, so that the formation of a subsequent nano-grade high-furnace titanium slag repairing film is facilitated.
After the preloading is finished, the magnesium alloy sample is placed in lubricating oil containing nano-grade high-furnace titanium slag as an additive for soaking treatment, and is taken out after being soaked for 2-4 hours. Specifically, the lubricating oil is semisynthetic lubricating oil or fully synthetic lubricating oil, and the acid value of the lubricating oil is less than or equal to 0.1 mgKOH/g. The granularity of the nano-grade high furnace titanium slag is 10-50nm, the content of the nano-grade high furnace titanium slag is 0.5-1 percent of the mass of the lubricating oil, and TiO in the nano-grade high furnace titanium slag215-25% of SiO215 to 20 percent of Al2O3The mass content of (A) is 10-15%. The blast furnace titanium slag is slag generated after the blast furnace smelting of the vanadium titano-magnetite, the mineral phases are complex, the main mineral phases are perovskite, Panti diopside, rich-Ti diopside and magnesia-alumina spinel, and the chemical property is stable and is insoluble in general acid and alkali. In the invention, the repair film formed by the nano-grade high-furnace titanium slag is compared with nano-copper and nano-TiO2The magnesium alloy material has the advantages of being more stable and stronger in corrosion resistance, being capable of effectively enhancing the fatigue performance of the magnesium alloy material in the presence of corrosive media under actual working conditions, and having obvious cost advantage.
After the surface of the magnesium alloy sample is degreased, shot blasting strengthening treatment is carried out on the surface of the magnesium alloy sample. Specifically, shot blasting shots adopted in the shot blasting strengthening process are ceramic shots; the diameter of the ceramic pill is 0.6-0.85mm, the shot blasting speed is 10-30m/s, the vibration frequency of a shot blasting vibrator is 30-50Hz, the shot blasting time is 10-20 minutes, the distance from a nozzle to the surface of the sample is 50-100mm, the shot blasting angle is 90 degrees, and the shot blasting is vertical blasting. The shot peening strengthening can form a nano layer with a nano-grade high furnace titanium slag repairing film on the surface of the magnesium alloy, and effectively improves the corrosion resistance, the wear resistance and the fatigue performance of the material by utilizing the physical stability of the high furnace titanium slag and the residual compressive stress in the nano layer. Meanwhile, the invention can also refine grains to further improve the fatigue strength of the material.
In the method for improving the fatigue property of the magnesium alloy, the tensile-compressive cyclic stress load lower than the yield limit is adopted for preloading, so that the crystal grains can be refined, and the fatigue strength can be improved; the magnesium alloy sample which is pre-loaded by a tensile-compressive cyclic stress load lower than the yield limit is placed in lubricating oil containing nano-grade high-furnace titanium slag as an additive for soaking treatment, then the surface of the magnesium alloy sample is treated by a shot peening strengthening method, the instantaneous high temperature generated on the surface of the sample is strengthened by shot peening, the adsorption capacity of the nano-grade high-furnace titanium slag on the surface of the sample is greatly improved, the nano-grade high-furnace titanium slag is in a molten or semi-molten state, and an extremely compact and fine repair film is further formed on the surface of the material; in addition, the surface of the sample is processed by using a shot peening strengthening method, a magnesium alloy nano-layer with residual compressive stress is formed on the lower surface of the nano-grade high-furnace titanium slag repair film, and the fatigue performance and the wear resistance of the material can be effectively improved. The method has simple and easy process, the raw material of the nano-grade high-furnace titanium slag for surface repair belongs to solid waste recovery, the cost is lower, and the overall technical and economic advantages are very obvious.
The following describes in detail embodiments of the present invention with reference to specific examples.
Example 1
The method for improving the fatigue performance of the magnesium alloy comprises the following steps:
and preloading the magnesium alloy sample by using a tensile-compression cyclic stress load lower than the yield limit in a room temperature environment by using a fatigue testing machine. Specifically, the surface roughness of the magnesium alloy sample was 0.2. The maximum stress in the tensile-compression cyclic stress load when the fatigue testing machine is adopted to pre-load the magnesium alloy sample is 10 percent of the yield limit, the stress ratio is 0, and the number of pre-loading cycles is 10000 cycles.
After the preloading is finished, the magnesium alloy sample is placed in lubricating oil containing nano-grade high-furnace titanium slag as an additive for soaking treatment, and is taken out after being soaked for 2 hours. Specifically, the lubricating oil is semisynthetic lubricating oil or fully synthetic lubricating oil, and the acid value of the lubricating oil is 0.03 mgKOH/g. The granularity of the nano-grade blast furnace titanium slag is 10nm, the content of the nano-grade blast furnace titanium slag is 0.5 percent of the mass of the lubricating oil, and TiO in the nano-grade blast furnace titanium slag215% by mass of SiO2Is 15% by mass, Al2O3The mass content of (A) is 10%.
After the surface of the magnesium alloy sample is degreased, shot blasting strengthening treatment is carried out on the surface of the magnesium alloy sample. Specifically, shot blasting shots adopted in the shot blasting strengthening process are ceramic shots; the diameter of the ceramic pellet was 0.6mm, the blasting velocity was 10m/s, the vibration frequency of the blasting vibrator was 30Hz, the blasting time was 10 minutes, the distance from the nozzle to the surface of the sample was 50mm, and the blast angle of the blasting was 90 degrees, which was vertical blasting.
Example 2
The method for improving the fatigue performance of the magnesium alloy comprises the following steps:
and preloading the magnesium alloy sample by using a tensile-compression cyclic stress load lower than the yield limit in a room temperature environment by using a fatigue testing machine. Specifically, the surface roughness of the magnesium alloy sample was 0.6. The maximum stress in the tensile-compression cyclic stress load when the fatigue testing machine is adopted to pre-load the magnesium alloy sample is 15 percent of the yield limit, the stress ratio is 0, and the number of times of pre-loading cycles is 7500 times.
After the preloading is finished, the magnesium alloy sample is placed in lubricating oil containing nano-grade high-furnace titanium slag as an additive for soaking treatment, and is taken out after being soaked for 2 hours. Specifically, the lubricating oil is semisynthetic lubricating oil or fully synthetic lubricating oil, and the acid value of the lubricating oil is 0.05 mgKOH/g. The granularity of the nano-grade blast furnace titanium slag is 30nm, the content of the nano-grade blast furnace titanium slag is 0.75 percent of the mass of the lubricating oil, and TiO in the nano-grade blast furnace titanium slag220% by mass of SiO2Is 17.5% by mass, Al2O3Has a mass content of 12.5％。
After the surface of the magnesium alloy sample is degreased, shot blasting strengthening treatment is carried out on the surface of the magnesium alloy sample. Specifically, shot blasting shots adopted in the shot blasting strengthening process are ceramic shots; the diameter of the ceramic pellet was 0.75mm, the blasting velocity was 20m/s, the vibration frequency of the blasting vibrator was 40Hz, the blasting time was 15 minutes, the distance from the nozzle to the surface of the sample was 75mm, and the blast angle of the blasting was 90 degrees, which was vertical blasting.
Example 3
The method for improving the fatigue performance of the magnesium alloy comprises the following steps:
and preloading the magnesium alloy sample by using a tensile-compression cyclic stress load lower than the yield limit in a room temperature environment by using a fatigue testing machine. Specifically, the surface roughness of the magnesium alloy sample was 0.8. The maximum stress in the tensile-compression cyclic stress load when the fatigue testing machine is adopted to pre-load the magnesium alloy sample is 20 percent of the yield limit, the stress ratio is 0, and the number of times of pre-loading cycles is 5000 cycles.
After the preloading is finished, the magnesium alloy sample is placed in lubricating oil containing nano-grade high-furnace titanium slag as an additive for soaking treatment, and is taken out after being soaked for 2 hours. Specifically, the lubricating oil is a semisynthetic lubricating oil or a fully synthetic lubricating oil, and the acid value of the lubricating oil is 0.1 mgKOH/g. The granularity of the nano-grade high furnace titanium slag is 50nm, the content of the nano-grade high furnace titanium slag is 1 percent of the mass of the lubricating oil, and TiO in the nano-grade high furnace titanium slag2Is 25% by mass of SiO220% by mass of Al2O3The mass content of (A) is 15%.
After the surface of the magnesium alloy sample is degreased, shot blasting strengthening treatment is carried out on the surface of the magnesium alloy sample. Specifically, shot blasting shots adopted in the shot blasting strengthening process are ceramic shots; the diameter of the ceramic pellet was 0.85mm, the blasting velocity was 30m/s, the vibration frequency of the blasting vibrator was 50Hz, the blasting time was 20 minutes, the distance from the nozzle to the surface of the sample was 100mm, and the blast angle of the blasting was 90 degrees, which was vertical blasting.
The above-mentioned embodiments are merely preferred embodiments for fully illustrating the present invention, and the scope of the present invention is not limited thereto. The equivalent substitution or change made by the technical personnel in the technical field on the basis of the invention is all within the protection scope of the invention. The protection scope of the invention is subject to the claims.
Claims (9)
1. A method for improving the fatigue property of magnesium alloy is characterized in that:
preloading a magnesium alloy sample by adopting a tensile-compression cyclic stress load lower than the yield limit in a room temperature environment by using a fatigue testing machine;
after preloading, putting the magnesium alloy sample into lubricating oil containing nano-grade high-furnace titanium slag as an additive for soaking treatment, and taking out after soaking for 2-4 hours;
after the surface of the magnesium alloy sample is degreased, shot blasting strengthening treatment is carried out on the surface of the magnesium alloy sample.
2. The method for improving fatigue performance of magnesium alloy according to claim 1, wherein: the surface roughness of the magnesium alloy sample is 0.2-0.8.
3. The method for improving fatigue performance of magnesium alloy according to claim 1, wherein: the acid value of the lubricating oil is not more than 0.1 mgKOH/g.
4. A method of improving fatigue performance of a magnesium alloy according to claim 3, wherein: the lubricating oil is semisynthetic lubricating oil or fully synthetic lubricating oil.
5. The method for improving fatigue performance of magnesium alloy according to claim 1, wherein: the granularity of the nano-grade high furnace titanium slag is 10-50 nm.
6. A method for improving fatigue properties of a magnesium alloy according to any of claims 1-5, wherein: the content of the nano-grade high furnace titanium slag is 0.5 to 1 percent of the mass of the lubricating oil.
7. According to the claimsThe method for improving the fatigue performance of the magnesium alloy is characterized by comprising the following steps: in nano-grade high furnace titanium slag, TiO215-25% of SiO215 to 20 percent of Al2O3The mass content of (A) is 10-15%.
8. The method for improving fatigue performance of magnesium alloy according to claim 1, wherein: the shot blasting shot adopted in the shot blasting strengthening procedure is ceramic shot; the diameter of the ceramic pill is 0.6-0.85mm, the shot blasting speed is 10-30m/s, the vibration frequency of a shot blasting vibrator is 30-50Hz, the shot blasting time is 10-20 minutes, the distance from a nozzle to the surface of the sample is 50-100mm, the shot blasting angle is 90 degrees, and the shot blasting is vertical blasting.
9. A method for improving fatigue performance of a magnesium alloy according to any of claims 1-5,8, wherein: the maximum stress in the tensile-compression cyclic stress load when the fatigue testing machine is adopted to pre-load the magnesium alloy sample is 10-20% of the yield limit, the stress ratio is 0, and the pre-loading cycle number is 5000-10000 cycles.
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Application publication date: 20200714 |