CN103320730B - Magnesium alloy heat treatment method combined with high-energy ultrasonic processing - Google Patents
Magnesium alloy heat treatment method combined with high-energy ultrasonic processing Download PDFInfo
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Abstract
The present invention relates to the technical field of heat treatment of magnesium alloy, specifically to a heat treatment method of magnesium alloy under the effect of high- energy ultrasonic field. According to the invention, magnesium alloy is placed below the end of high- energy ultrasonic amplitude-change pole and heated in an oil medium at a certain temperature for solution treatment for an appropriate time, and meanwhile high- energy ultrasound with different power is applied. After that, quenching treatment is undertaken in an oil medium at a certain temperature. Then magnesium alloy is placed below the end of high- energy ultrasonic amplitude-change pole and heated in an oil medium at a certain temperature for aging treatment for an appropriate time and meanwhile high- energy ultrasound with different power is applied; after the aging treatment and ultrasonic processing, the adjusting bolt is loosened, and the sample is taken to be air cooled to room temperature. The art provided by the invention is simple, and the grain of magnesium alloy after heat-treatment is fine with round appearance, improving the performance of the magnesium alloy.
Description
Technical field
The present invention relates to the heat treated technical field of magnesium alloy, be related specifically to the magnesium alloy heat treatment process under high-energy ultrasonic field action.
Background technology
Magnesium alloy is structural metallic materials the lightest in practical application, has the characteristics such as density is little, specific tenacity is high, thermal diffusivity is good, absorbing is good, electromagnetic wave shielding is good, in automobile, communication and electron trade, obtains increasingly extensive application.Thermal treatment is the important means improving or adjust magnesium alloy mechanical property and processing characteristics; Some thermal treatment process can reduce casting internal stress or the quenching stress of Mg alloy castings, thus improve the dimensional stability of workpiece, and some thermal treatment process can make magnesium alloy produce strengthening; Can the solid solubility of magnesium alloy inner alloy element determine this magnesium alloy and improve its performance by thermal treatment, if solid solubility varies with temperature, then can pass through thermal treatment improving SNR; The thermal treatment of magnesium alloy is treated to master with solution treatment and artificial aging.Solution treatment is under certain temperature and soaking time, makes magnesium alloy interalloy element solid solution form sosoloid in α-Mg matrix, obtains suitable grain fineness number, improves the intensity of magnesium alloy, hardness and creep property; But because magnesium alloy inner element performance is more stable, atomic diffusion is comparatively slow, so will carry out longer heat-up time to ensure that strengthening phase fully dissolves to it, this process is very slowly and requires great effort; In order to prevent magnesium alloy from heat treated process, oxidizing reaction occurring, also must pass into nitrogen, helium or argon gas and protect, process for producing is loaded down with trivial details; Magnesium alloy then carries out artificial aging again after carrying out solution treatment, can produce precipitated phase, and precipitated phase and glissile dislocation interact, and yield strength is improved, and magnesium alloy is strengthened, but long-time heating remains Problems existing in this process.
The retrieval of prior art document is found, heat treatment technics for magnesium alloy has many bibliographical informations, as China Patent No. 200610095197.3(title " a kind of solid solution treatment method for Mg-Al series cast magnesium alloy heat treatment reinforcement "), this patented technology is after alloy melting is warmed up to 700 ~ 720 DEG C, cast, in castingprocesses after the temperature of alloy drops to the solid solution temperature of below alloy solidus temperature, 12 ~ 17 hours are incubated under protective atmosphere, then taking out fast quenches in water, this technomania treatment temp is high, treatment time is long, cost is high, prepared alloy property awaits further raising, China Patent No. 200610125518.3(title " a kind of magnesium alloy heat treatment process in conjunction with current processing "), traditional magnesium alloy thermal treatment process basis applies electric current, solid solution aging temperature is higher, solution treatment and aging time longer, there is certain limitation in this preparation technology.
Up to the present, the magnesium alloy heat treatment technics under high-energy ultrasonic effect has no report; Therefore, the art of this patent provides a kind of magnesium alloy heat treatment process in conjunction with high-energy ultrasonic process.The method can shorten magnesium alloy thermal treatment solution time and artificial aging time greatly, reduces magnesium alloy solid solution aging temperature, avoids magnesium alloy oxidation under the high temperature conditions.Improve efficiency, reduce costs, improve the performance of magnesium alloy.
Summary of the invention
The object of the invention is the deficiency existed for prior art, a kind of magnesium alloy heat treatment process in conjunction with high-energy ultrasonic process is provided, under lesser temps and short period heat-treat condition, the high-energy ultrasonic effect of high-energy ultrasonic (heat effect, sound cavitation effect, acoustic streaming effect) is utilized to improve magnesium alloy thermal treatment process, there is the advantages such as technique is simple, pollution-free, preparation cost is low, and the Properties of Magnesium Alloy after thermal treatment is excellent.
The present invention is achieved by the following technical solutions, be connected with high-energy ultrasonic horn end by magnesium alloy, the oily medium being placed in certain temperature heats, and carries out solution treatment for some time, apply the high-energy ultrasonic of different capacity simultaneously, then in the oily medium of certain temperature, carry out quench treatment; This technical matters is simple, and the magnesium alloy grain-size after thermal treatment is tiny, and pattern rounding improves the performance of magnesium alloy.Technological process comprises that magnesium alloy is connected with high-energy ultrasonic horn end, heat-treatment medium heats, apply high-energy ultrasonic and quenching.
The present invention includes following steps:
(1) be placed in by magnesium alloy on sample support plate, sample support plate is connected with end support in high-energy ultrasonic horn with adjusting nut by adjustment bolt; Sample and horn end is made to keep certain spacing H by adjustment bolt.
(2) device that step (1) connects is immersed in oily medium, keeps horn top to be immersed in certain depth in oily medium, Medium Oil is heated to certain temperature, solution treatment for some time is carried out to sample.
(3) open the ultra-sonic generator in step (1) while solution treatment, adjustment ultrasonic power size, carries out the supersound process of the different mode of action to sample.
(4) to step (3) with after (4) process for some time, unclamped by the adjustment bolt in step (1), oily medium sample being put into fast certain temperature carries out quench treatment.
(5) by the sample repeating step (1) of step (5) quench treatment.
(6) device that step (6) connects is immersed in oily medium, keeps horn top to be immersed in certain depth in oily medium, Medium Oil is heated to certain temperature, ageing treatment is carried out to sample; The medium temperature of ageing treatment should lower than the medium temperature of step 2.
(7) repeating step (3).
(8), after timeliness and supersound process, adjustment bolt is unclamped, takes off sample air cooling to room temperature.
Device described in step (1) as shown in the figure.
Spacing H scope described in step (1) is at 5 ~ 15mm.
Medium temperature range described in step (2) is at 280 DEG C ~ 328 DEG C.
Solution treatment time range described in step (2) is at 2 ~ 5h.
Certain depth scope described in step (2) is at 5 ~ 8mm.
Ultrasonic power magnitude range described in step (3) is at 0.6kW ~ 2.0kW.
The mode of action described in step (3) is continuous action and intermittent action, and intermittent action interval time is 10 ~ 15min.
The time of putting into fast described in step (4) is less than 3s, and quenchant oil temperature is 89 DEG C.
Certain depth scope described in step (6) is at 5 ~ 8mm.
Timeliness Medium Oil temperature described in step (6) is 155 ~ 175 DEG C.
Aging time described in step (6) is 3 ~ 6h.
Compared with current existing magnesium alloy heat treatment technics, the present invention in conjunction with high-energy ultrasonic field to magnesium alloy thermal treatment, shorten the magnesium alloy heat treated solid solution aging time, reduce thermal treatment temp, avoid magnesium alloy oxidation under the high temperature conditions, have the feature of energy-efficient low cost, the preparation for low-cost and high-performance magnesium alloy provides an effective means.
Accompanying drawing explanation
Fig. 1 experimental installation schematic diagram;
The SEM figure of the magnesium alloy of short time high temperature solid solution under the low ultrasonic power of Fig. 2+long-time artificial aging process;
The SEM figure of the magnesium alloy of short time high temperature solid solution under Fig. 3 high ultrasonic power+short period of time artificial aging process.
Embodiment
Below embodiments of the invention are elaborated: this example is implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
example 1
the magnesium alloy of short time high temperature solid solution under low ultrasonic power+long-time artificial aging process
The spacing keeping AZ91D magnesium alloy sample and horn end is 10mm, sample is immersed in oily medium, horn top is kept to immerse 5mm in Medium Oil, Medium Oil is heated to 328 DEG C, open Ultrasonic Horn Apparatus simultaneously, adjustment ultrasonic power is 0.6kW, the mode of action is that interval applies, the timed interval is 15min, after solution treatment 2h, unclamp joint bolt, after the oily medium putting into 89 DEG C fast carries out quench treatment, the Medium Oil ageing treatment 3h of 175 DEG C put into by sample, and apply power is the ultrasonic of 0.6kW simultaneously; After thermal treatment terminates, sample is naturally cooled to room temperature, make SEM microtexture test samples and mechanics properties testing sample; SEM microtexture detected result shows, the β-Mg in discontinuous net distribution in matrix
17al
12phase, its pattern major part is block, as shown in Figure 2; The tensile strength of the AZ91D magnesium alloy after above-mentioned process is 298MPa, and yield strength is 267MPa, and elongation is 6.3%.
example 2
the magnesium alloy of short time high temperature solid solution under high ultrasonic power+short period of time artificial aging process
The spacing keeping AZ91D magnesium alloy sample and horn end is 13mm, sample is immersed in oily medium, horn top is kept to immerse 5mm in Medium Oil, Medium Oil is heated to 280 DEG C, open Ultrasonic Horn Apparatus simultaneously, adjustment ultrasonic power is 1.8kW, the mode of action is that interval applies, the timed interval is 15min, after solution treatment 2h, unclamp joint bolt, after the oily medium putting into 89 DEG C fast carries out quench treatment, the Medium Oil ageing treatment 4h of 165 DEG C put into by sample, apply power is the ultrasonic of 1.8kW simultaneously, after thermal treatment terminates, sample is naturally cooled to room temperature, make SEM microtexture test samples and mechanics properties testing sample, SEM microtexture detected result shows, presents the β-Mg of continuous and discontinuous net distribution in matrix
17al
12phase, its pattern is fine particle shape, as shown in Figure 3, the tensile strength of the AZ91D magnesium alloy after above-mentioned process is 320MPa, and yield strength is 280MPa, and elongation is 4.9%.
material property prepared by table one the present invention and material property prepared by other technique contrast
Claims (1)
1., in conjunction with a magnesium alloy heat treatment process for high-energy ultrasonic process, it is characterized in that comprising the following steps:
(1) be placed in by magnesium alloy on sample support plate, sample support plate is connected with end support in high-energy ultrasonic horn with adjusting nut by adjustment bolt; Sample and horn end is made to keep certain spacing H by adjustment bolt;
(2) device that step (1) connects is immersed in oily medium, keeps horn top to be immersed in certain depth in oily medium, Medium Oil is heated to certain temperature, solution treatment for some time is carried out to sample;
(3) open the ultra-sonic generator in step (1) while solution treatment, adjustment ultrasonic power size, carries out the supersound process of the different mode of action to sample;
(4) to step (2) with after (3) process for some time, unclamped by the adjustment bolt in step (1), oily medium sample being put into fast certain temperature carries out quench treatment;
(5) by the sample repeating step (1) of step (4) quench treatment;
(6) device that step (5) connects is immersed in oily medium, keeps horn top to be immersed in certain depth in oily medium, Medium Oil is heated to certain temperature, ageing treatment is carried out to sample; The medium temperature of ageing treatment should lower than the medium temperature of step (2);
(7) repeating step (3);
(8), after timeliness and supersound process, adjustment bolt is unclamped, takes off sample air cooling to room temperature;
Spacing H scope in described step (1) is at 5 ~ 15mm;
Medium temperature range in described step (2) is at 280 DEG C ~ 328 DEG C; Solution treatment time range described in step (2) is at 2 ~ 5h; Certain depth scope described in step (2) is at 5 ~ 8mm;
Ultrasonic power magnitude range in described step (3) is at 0.6kW ~ 2.0kW; The mode of action described in step (3) is continuous action and intermittent action, and intermittent action interval time is 10 ~ 15min;
The time of putting into fast in described step (4) is less than 3s, and quenchant oil temperature is 89 DEG C;
Certain depth scope in described step (6) is at 5 ~ 8mm; Timeliness Medium Oil temperature described in step (6) is 155 ~ 175 DEG C; Aging time described in step (6) is 3 ~ 6h.
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| CN104451493A (en) * | 2014-11-14 | 2015-03-25 | 无锡阳工机械制造有限公司 | Copper alloy surface treating method |
| CN104451492A (en) * | 2014-11-14 | 2015-03-25 | 无锡阳工机械制造有限公司 | Surface treatment method for lead-tin alloy |
| CN105755230B (en) * | 2014-12-18 | 2017-12-26 | 北京有色金属研究总院 | A kind of magnesium alloy quenches timeliness integrated device |
| CN109023178A (en) * | 2018-08-28 | 2018-12-18 | 安徽工程大学 | A kind of 7075 aluminium alloy low temp ultrasonic ageing effect processing methods |
| CN114182185A (en) * | 2021-12-03 | 2022-03-15 | 上海航天精密机械研究所 | Microwave-assisted solution treatment method for magnesium alloy |
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Effective date of registration: 20170407 Address after: South high tech Industrial Development Zone, Jiangsu province Zhenjiang City three road 212000 No. 8 Patentee after: Zhenjiang Haili new Mstar Technology Ltd Address before: Zhenjiang City, Jiangsu Province, 212013 Jingkou District Road No. 301 Patentee before: Jiangsu University |
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