CN106435424A - Laser shocking method of changing whole performance of AZ31B magnesium alloy - Google Patents
Laser shocking method of changing whole performance of AZ31B magnesium alloy Download PDFInfo
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- CN106435424A CN106435424A CN201610841370.7A CN201610841370A CN106435424A CN 106435424 A CN106435424 A CN 106435424A CN 201610841370 A CN201610841370 A CN 201610841370A CN 106435424 A CN106435424 A CN 106435424A
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- magnesium alloy
- laser
- az31b
- az31b magnesium
- temperature resistant
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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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- Crystallography & Structural Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Other Surface Treatments For Metallic Materials (AREA)
Abstract
The invention discloses a laser shocking method of changing the whole performance of AZ31B magnesium alloy. The laser shocking method comprises the following steps: (1) mechanically polishing the surface of the AZ31B magnesium alloy, and removing an oxide film; (2) spraying a layer of high-temperature resistant black paint on the surface of the AZ31B magnesium alloy; and (3) laser shocking the AZ31B magnesium alloy, wherein the laser power adopted in the third step is 1000-3000W, the scanning rate is 300-1200mm/min, the diameter of a light spot is 4mm, the overlapping rate is 15%, and protective gas is argon with the flow being 25mL/min. As for the magnesium alloy after being processed by the method, the strength of a solidified layer is high, the size of microstructure grains of the solidified layer is lowered by 64 percent or more relative to the original AZ31B magnesium alloy, the magnesium alloy is higher in elongation rate, and the whole performance is remarkably improved.
Description
Technical field
The present invention relates to Laser Surface Treatment field, more particularly, to a kind of laser of change AZ31B magnesium alloy overall performance
Impact method.
Background technology
Magnesium and magnesium alloy have many outstanding performances, such as high specific stiffness and specific strength, good damping capacity and lead
Hot, good electromagnetic shielding capability etc..Therefore, magnesium material has become the third-largest engineering material.However, the room temperature of magnesium alloy
Mechanical property (especially hardness, toughness) is relatively low, corrosion-resistant poor, this severely limits research and the application of magnesium alloy.Therefore,
The intensity, hardness, wearability and the corrosion resistance that how to improve magnesium alloy materials are difficult problems urgently to be resolved hurrily.
Laser impact technology can improve tissue and the performance of material surface in the case of being not added with any other material, can
Reduce production cost with effective.Using YAG laser, laser power is 2000W, and scanning speed is 800mm/min, spot diameter
For 5mm, protective gas is argon, and throughput is 25mL/min, and ZE41 magnesium alloy is carried out with laser-impact experiment, consolidation layer hardness
424HV is brought up to by 72HV；In salt bath experiment, the time that point corrosion in ZE41 magnesium alloy brings up to 13h by 2h.Using
CO2Laser instrument, laser power is 2500W, and scanning speed is 1000mm/min, a diameter of 6mm of LASER SPECKLE, and protective gas is argon
Gas, throughput is 25mL/min, and MEZ magnesium alloy (Zn 0.5%, Mn 0.1%, Zr 0.1%, rare earth element 2%) is swashed
Light impact experiment, tensile strength brings up to 578MPa by 301MPa, and hardness brings up to 78HV by 45HV.Using CO2Laser instrument, swashs
Luminous power is 2300W, and scanning speed is 900mm/min, a diameter of 4mm of LASER SPECKLE, and protective gas is argon, and throughput is
25mL/min, to AZ31, tri- kinds of magnesium alloys of AZ61 and WE43 carry out laser-impact experiment, are then immersed in 10 in 5%NaCl solution
My god, three kinds of quality of magnesium alloy decrease 30%, 60% and 87% respectively.Using YAG laser, laser power is 2100W, scanning
Speed is 800mm/min, a diameter of 5mm of LASER SPECKLE, and protective gas is argon, and throughput is 25mL/min, and AZ91D magnesium is closed
Gold carries out laser-impact experiment, carries out electrochemical corrosion experimental in 3.5%NaCl solution, and corrosion potentials are improved by -1559mV
Arrive -1536mV, corrosion current is by 0.0459mA/cm2It is reduced to 0.0457mA/cm2, the decay resistance to AZ91D for the laser-impact
Change inconspicuous.
From examples detailed above, although existing laser impact technology to Mg alloy surface tissue and performance have certain
Improvement result, but its improvement is single, is only capable of improving performance in a certain respect.
Content of the invention
It is an object of the invention to provide a kind of laser shock method that can change AZ31B magnesium alloy multinomial performance.
The purpose of the present invention is achieved through the following technical solutions：
A kind of laser shock method of change AZ31B magnesium alloy overall performance, comprises the steps：
(1) by AZ31B Mg alloy surface mechanical grinding, remove oxide-film；
(2) in one layer of high temperature black colored paint of AZ31B magnesium alloy surface spraying；
(3) laser-impact is carried out to AZ31B magnesium alloy；
The laser power adopting in above-mentioned steps (3) is 1000W-3000W, and sweep speed is 300-1200mm/min, light
Spot diameter is 4mm, and overlapping rate is 15%, and protective gas is 25mL/min for the flow of argon and argon.
Preferably, described laser power is 1500W-2500W, and sweep speed is 500-1000mm/min.
Described high temperature resistant pitch-dark temperature resistant range is 800～1000 DEG C.
AZ31B magnesium alloy after being processed with the inventive method has advantages below：
(1) the consolidation layer of AZ31B magnesium alloy has the intensity of 400MPa or higher, 24% or higher extension in room temperature
Rate, overall performance is significantly improved.And tradition magnesium alloy is that single aspect performance is higher, overall performance is low, has bright
Aobvious shortcoming.
(2) crystallite dimension of AZ31B magnesium alloy consolidation layer tissue reduces 64% or more with respect to original AZ31B magnesium alloy
Many.
Specific embodiment
With reference to specific embodiment, the inventive method is described in further detail.
According to the following steps laser-impact is carried out to AZ31B magnesium alloy：
(1) by AZ31B Mg alloy surface mechanical grinding, remove oxide-film；
(2) high temperature resistant pitch-dark in one layer of AZ31B magnesium alloy surface spraying, high temperature resistant pitch-dark temperature resistant range is 800～
1000℃；
(3) laser-impact is carried out to AZ31B magnesium alloy.
The concrete laser-impact process conditions of 9 embodiments and testing result see table：
Original AZ31B magnesium alloy crystallite dimension is about 25 μm, and tensile strength is about 290MPa, and elongation percentage is about 12%.
As seen from the above table, carry out the AZ31B magnesium alloy after laser-impact process and original AZ31B magnesium with the method for the present invention
Alloy is compared with advantages below：
(1) the AZ31B magnesium alloy consolidation layer after laser-impact is processed has the tensile strength of 400MPa or higher in room temperature,
24% or higher elongation percentage, overall performance is significantly improved.And tradition magnesium alloy is that single aspect performance is higher, overall
Performance is low, has obvious shortcoming.
(2) AZ31B magnesium alloy consolidation layer tissue crystallite dimension reduces 64% or more with respect to original AZ31B magnesium alloy
Many.
Claims (3)
1. a kind of laser shock method of change AZ31B magnesium alloy overall performance it is characterised in that：Comprise the steps：
(1) by AZ31B Mg alloy surface mechanical grinding, remove oxide-film；
(2) high temperature resistant pitch-dark in one layer of AZ31B magnesium alloy surface spraying；
(3) laser-impact is carried out to AZ31B magnesium alloy；
The laser power adopting in above-mentioned steps (3) is 1000W-3000W, and sweep speed is 300-1200mm/min, and hot spot is straight
Footpath is 4mm, and overlapping rate is 15%, and protective gas is 25mL/min for the flow of argon and argon.
2. laser shock method according to claim 1 it is characterised in that：Described laser power is 1500W-2500W,
Sweep speed is 500-1000mm/min.
3. laser shock method according to claim 1 it is characterised in that：Described high temperature resistant pitch-dark temperature resistant range is
800～1000 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610841370.7A CN106435424A (en) | 2016-09-22 | 2016-09-22 | Laser shocking method of changing whole performance of AZ31B magnesium alloy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610841370.7A CN106435424A (en) | 2016-09-22 | 2016-09-22 | Laser shocking method of changing whole performance of AZ31B magnesium alloy |
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| CN106435424A true CN106435424A (en) | 2017-02-22 |
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| CN201610841370.7A Pending CN106435424A (en) | 2016-09-22 | 2016-09-22 | Laser shocking method of changing whole performance of AZ31B magnesium alloy |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114774815A (en) * | 2022-05-10 | 2022-07-22 | 西南交通大学 | Laser melting process beneficial to improving wear resistance of alloy |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1986841A (en) * | 2006-11-03 | 2007-06-27 | 江苏大学 | Method of raising corrosion resistance of magnesium alloy based on reiforcing laser impact technology |
| CN101532134A (en) * | 2009-04-24 | 2009-09-16 | 太原理工大学 | Method for enhancing surface of magnesium aluminium alloy by laser remelting |
| CN104784750A (en) * | 2015-04-03 | 2015-07-22 | 中国科学院金属研究所 | Surface modification method for improving corrosion resistance of deformable biomedical magnesium alloy implantable device |
-
2016
- 2016-09-22 CN CN201610841370.7A patent/CN106435424A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1986841A (en) * | 2006-11-03 | 2007-06-27 | 江苏大学 | Method of raising corrosion resistance of magnesium alloy based on reiforcing laser impact technology |
| CN101532134A (en) * | 2009-04-24 | 2009-09-16 | 太原理工大学 | Method for enhancing surface of magnesium aluminium alloy by laser remelting |
| CN104784750A (en) * | 2015-04-03 | 2015-07-22 | 中国科学院金属研究所 | Surface modification method for improving corrosion resistance of deformable biomedical magnesium alloy implantable device |
Non-Patent Citations (1)
| Title |
|---|
| 葛亚琼: "AZ31B镁合金CO2气体激光表面改性的组织和性能研究", 《中国优秀硕士学位论文全文数据库 工程科技1辑》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114774815A (en) * | 2022-05-10 | 2022-07-22 | 西南交通大学 | Laser melting process beneficial to improving wear resistance of alloy |
| CN114774815B (en) * | 2022-05-10 | 2023-04-11 | 西南交通大学 | Laser melting process beneficial to improving wear resistance of alloy |
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Application publication date: 20170222 |
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