CN102586561A - Processing technology of large-size high-strength magnesium alloy sheet - Google Patents
Processing technology of large-size high-strength magnesium alloy sheet Download PDFInfo
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Abstract
The invention provides processing technology of a large-size high-strength magnesium alloy sheet, relating to the technical field of manufacturing technology of high-strength wrought magnesium alloy sheets. The processing technology is characterized by successively carrying out homogenizing annealing, forging, post processing, rolling and saw cutting and surface cleaning treatment on magnesium alloy ingots subjected to face milling, edge milling and chamfering. The processing technology has the following advantages: by reducing the thickness of the magnesium alloy sheet and then refining the grain sizes of the magnesium alloys through rolling, the aim of improving the comprehensive mechanical properties of the magnesium alloy sheet is achieved and the final yield strength, tensile strength and other indexes of the sheet are higher than such indexes of the products produced by existing production technologies such as cast rolling, hot rolling, warm rolling and extruding during actual production of the same grade of magnesium alloys.
Description
Technical field
The present invention relates to technical field of nonferrous metal processing, particularly the manufacturing process technology field of high-strength wrought magnesium alloys sheet material.
Background technology
Magnesiumalloy has favorable conductive, thermal conductivity, and electromagnetic wave shielding is good, and specific tenacity and specific rigidity are high; Damping property is good; Cut and good dimension stability are prone to reclaim, and help advantages such as environmental protection; In industries such as aerospace, the vehicles, telecommunications great application prospect is arranged, be described as " the green engineering material of 21 century ".But because magnesiumalloy belongs to close-packed hexagonal structure, temperature-room type plasticity is lower, and forming ability is poor, big limitations the magnesiumalloy application.The production for the sheet material of wrought magnesium alloys at present mainly concentrates on hot rolling system, hot extrusion, these several kinds of modes of texturing of continuous casting and rolling; Hot rolling panel and continuous casting and rolling sheet material over-all properties are relatively poor; The hot extrusion board size is less, anisotropy is bigger, has greatly limited applying of large-size high-tensile degree wrought magnesium alloys.
Summary of the invention
The object of the invention is to propose a kind of forming, help improving a kind of complete processing of large-size high-tensile degree magnesium alloy plate of the comprehensive mechanical property of sheet material.
Technical scheme of the present invention is: to through mill face, mill the limit, the magnesium alloy ingot of chamfering carries out homogenizing annealing successively, forging, post-treatment, rolling and sawing, surface-conditioning are handled.
The present invention is through attenuate magnesium alloy plate thickness; Again through rolling refined magnesiumalloy grain fineness number; Reach the purpose of the comprehensive mechanical property that improves magnesium alloy plate, indexs such as the final ys of sheet material, tensile strength all are higher than with the product that uses existing production technique such as casting, hot rolling, warm-rolling, extruding to produce in the actual production of trade mark magnesiumalloy.
Homogenizing annealing according to the invention is: magnesium alloy ingot is heated up with stove or when furnace temperature is lower than 200 ℃, advances stove; < 10 ℃/>min of heat-up rates; And make magnesium alloy ingot temperature gradient increased temperature between 250～400 ℃, and, between 400～470 ℃, be incubated 4～20h then at each temperature section insulation 2～15h; Place air to reduce to room temperature naturally magnesium alloy ingot after coming out of the stove, guarantee the magnesiumalloy homogenization of composition and eliminate internal residual stress.
Forging according to the invention is to adopt open die forging, realizes two-sided symmetric deformation.
The road number of times of said open die forging is 3～9 times, and every time forges the back and under 350 ℃ of furnace temperature environment, melts down annealing 2h; The surface temperature of magnesium alloy ingot was 360～450 ℃ when cogging was forged, and draft is 20～55%; Every time successively decreases 15～40 ℃ the surface temperature of cogging forging back magnesium alloy plate, and each percentage pass reduction is 20～45%; The surface temperature of magnesium alloy plate was 250～350 ℃ when last passage was forged, and draft is 10～25%.Can make and be the further rolling organization condition that provides of magnesium alloy plate by even crystal grain thinning when forging attenuate magnesium alloy plate thickness (below the average grain size 60 μ m).
In addition, the mold preheating temperature that contacts with magnesium alloy plate during said open die forging must not be lower than 100 ℃ than magnesium alloy plate temperature, and minimum temperature＞200 ℃.
During said open die forging, forging between tup and the sheet material, adopting solid lubrication between chopping block and the sheet material, homogeneous deformation when guaranteeing that magnesium alloy plate forges.
In order to guarantee can to nip more reposefully when rolling, post-treatment according to the invention is: through machining, make magnesium alloy forging formation plate surface and side flawless, and carry out the side chamfering.
Rolling passage according to the invention is 2～9 times, said rolling be cold rolling or warm-rolling, each annealing back continuous rolling 1～3 time, percentage pass reduction is 4～12%.
When warm-rolling, the magnesium alloy plate surface temperature is not higher than 250 ℃, and percentage pass reduction is 6～15%, and melting down annealing temperature behind each warm-rolling is between 250～350 ℃, and annealing time is 1～3h.Can make uniform crystal particles and size control below 10 μ m.
When rolling back magnesium alloy plate length and width size all is not more than 1800mmX1800mm, can adopt the tandem rolling method rolling, when promptly rolling, whenever roll just to change after a time and roll to 90 °, or after same direction multi-pass is rolling, change again roll to.Tandem rolling and annealing process annealing process are effectively combined, make rolling attitude magnesium alloy plate crystal grain tiny evenly, anisotropy is little, helps improving the comprehensive mechanical property of sheet material.
Can carry out solution treatment, solution treatment+artificial aging, hydrogen treatment thermal treatments such as (to the Mg-Zn-Re-Zr alloy) according to selected alloy species and service condition after rolling.Magnesiumalloy (like the MB2) forging that magnesiumalloy that thermal treatment can not be strengthened (like MB1/MB8) and heat treatment reinforcement effect are little can be without thermal treatment or only through the softening annealing processing.MB3/MB5 is general only to be handled through the row softening annealing.Heat-treatable strengthened magnesiumalloy (like the MB7 magnesiumalloy) adopts solution treatment, also can handle through row solution treatment+artificial aging in case of necessity.After rolling, also can directly adopt some heat-treatable strengthened alloy (like the MB15 alloy) artificial aging of differing temps to handle sometimes.
The invention has the advantages that:
1, the present invention's method that will use heat forged and cold rolling (or warm-rolling) to combine prepares magnesium alloy plate, makes even grain size and realize refinement or super-refinement, thereby makes magnesium alloy plate have high-intensity performance characteristic.And under the situation that tandem rolling and annealing process annealing process effectively combine, rolling attitude magnesium alloy plate crystal grain is more tiny evenly, and anisotropy difference is little, helps further improving the comprehensive mechanical property of sheet material.
3, can go different thermal treatment according to selected alloy species and service condition after rolling, effectively improve the over-all properties of magnesiumalloy.
4, through this explained hereafter go out magnesium alloy plate, indexs such as ys, tensile strength all are higher than with the product that uses the existing production technique of casting, hot rolling or warm-rolling, extruding etc. to produce in the actual production of trade mark magnesiumalloy.
Embodiment
Below in conjunction with trade mark AZ31B, the production stage of magnesium alloy plate specification 28mm * 1800 mm * 2100 mm that process is that example further specifies:
1, prepare before forging: (specification: 260mm * 780mm * 1800mm) mills face, mill and carry out homogenizing after limit and the chamfering and handle to the flat ingot casting of magnesiumalloy.
Homogenizing annealing treatment process: magnesium alloy ingot is heated up with stove or when furnace temperature is lower than 200 ℃, advances stove; < 10 ℃/>min of heat-up rates; And make magnesium alloy ingot temperature gradient increased temperature between 250～400 ℃; And, between 400～470 ℃, be incubated 4～20h then at each temperature section insulation 2～15h, place air to reduce to room temperature naturally magnesium alloy ingot after coming out of the stove.
2, ingot casting heating: 430 ℃ of ingot casting Heating temperatures, soaking time 6h.
3, forging process:
The mold preheating temperature that contacts with magnesium alloy plate during forging must not be lower than 100 ℃ than magnesium alloy plate temperature, and minimum temperature＞200 ℃, and, forging between tup and the sheet material, adopting graphite or molybdenum oxide or glass powder to carry out solid lubrication between chopping block and the sheet material.
The surface temperature of magnesium alloy ingot was 430 ℃ when cogging was forged, and every time successively decreases 15～40 ℃ the surface temperature of cogging forging back magnesium alloy plate, and the surface temperature of magnesium alloy plate was 250～350 ℃ when last passage was forged.
Every time forges the back and under 350 ℃ of furnace temperature environment, melts down annealing 2h.
Smithing technological parameter sees the following form:
4, post-treatment: face, cleaning are milled in side chamfering, surface, make magnesium alloy forging formation plate surface and side flawless,
5, rolling technology:
Rolling passage is 2～9 times, can adopt cold rolling or warm-rolling, each annealing back continuous rolling 1～3 time, and percentage pass reduction is 4～12%.
When rolling, whenever roll just to change after a time and roll to 90 °, or after same direction multi-pass is rolling, change again roll to.
Normal temperature rolling (promptly cold rolling) processing parameter sees the following form:
During warm-rolling, the magnesium alloy plate surface temperature is not higher than 250 ℃, and percentage pass reduction is 6～15%, and melting down annealing temperature behind each warm-rolling is between 250～350 ℃, and annealing time is 1～3h.
6, sawing, surface-conditioning: with the burr excision, air spots and lubricant polish or mill light at normal temperatures, and product specification is 260mm * 780mm * 1800mm.
7, mechanical performance of products detects: intensity is high, and anisotropy difference is little.Wherein along forging direction, vertically forge direction, and forge direction and become the tension of 45 ° of angle directions and ys to differ very little, Rm=323～331Mpa wherein, R0.2=273～286MPa.
Magnesium alloy plate specification (length and width) and performance comparison with routine production magnesium alloy plate explained hereafter:
(1) conventional hot rolling system magnesium alloy plate
Sheet material specification width is not more than: 1800mm
Along rolling direction: Rm=270MPa, R0.2=210MPa.
Become 45 ° with rolling direction: Rm=262MPa, R0.2=189MPa
(2) conventional hot extrusion magnesium alloy plate
Sheet material specification width is not more than: 600mm (extrusion equipment is expensive to need several hundred million)
(along extruding parallel direction): Rm=300MPa, R0.2=200-270MPa.
With extrude direction and become 45 °: Rm=132.9MPa
(3) conventional continuous casting and rolling magnesium alloy plate
Sheet material specification width is not more than: 1800mm
Along rolling direction:: Rm=300MPa, R0.2=200-270MPa.
With extrude direction and become 45 °: Rm=263MPa
8, oiling packing: finished product is carried out oiling packing warehouse-in.
Claims (10)
1. a kind of complete processing of large-size high-tensile degree magnesium alloy plate, it is characterized in that to through mill face, mill the limit, the magnesium alloy ingot of chamfering carries out homogenizing annealing successively, forging, post-treatment, rolling and sawing, surface-conditioning are handled.
2. according to a kind of complete processing of the said large-size high-tensile degree of claim 1 magnesium alloy plate; It is characterized in that said homogenizing annealing is: magnesium alloy ingot is heated up with stove or when furnace temperature is lower than 200 ℃, advances stove; Heat-up rate 10 ℃/min, and make magnesium alloy ingot temperature gradient increased temperature between 250～400 ℃, and at each temperature section insulation 2～15h; Between 400～470 ℃, be incubated 4～20h then, place air to reduce to room temperature naturally magnesium alloy ingot after coming out of the stove.
3. according to a kind of complete processing of the said large-size high-tensile degree of claim 1 magnesium alloy plate, it is characterized in that said forging is to adopt the open die forging that realizes two-sided symmetric deformation.
4. according to a kind of complete processing of the said large-size high-tensile degree of claim 3 magnesium alloy plate, the road number of times that it is characterized in that said open die forging is 3～9 times, and every time forges back annealing 2h under 350 ℃ of furnace temperature environment; The surface temperature of magnesium alloy ingot was 360～450 ℃ when cogging was forged, and draft is 20～55%; Every time successively decreases 15～40 ℃ the surface temperature of cogging forging back magnesium alloy plate, and each percentage pass reduction is 20～45%; The surface temperature of magnesium alloy plate was 250～350 ℃ when last passage was forged, and draft is 10～25%.
5. according to a kind of complete processing of the said large-size high-tensile degree of claim 3 magnesium alloy plate, the mold preheating temperature that contacts with magnesium alloy plate when it is characterized in that said open die forging must not be lower than 100 ℃ than magnesium alloy plate temperature, and minimum temperature＞200 ℃.
6. according to a kind of complete processing of the said large-size high-tensile degree of claim 3 magnesium alloy plate, when it is characterized in that said open die forging, forging between tup and the sheet material, adopting solid lubrication between chopping block and the sheet material.
7. according to a kind of complete processing of the said large-size high-tensile degree of claim 1 magnesium alloy plate, it is characterized in that said post-treatment is: through machining, make magnesium alloy forging formation plate surface and side flawless, and carry out the side chamfering.
8. according to a kind of complete processing of the said large-size high-tensile degree of claim 1 magnesium alloy plate, it is characterized in that said rolling passage is 2～9 times, said rolling be cold rolling or warm-rolling, each annealing back continuous rolling 1～3 time, percentage pass reduction is 4～12%.
9. a kind of complete processing of said according to Claim 8 large-size high-tensile degree magnesium alloy plate; When it is characterized in that said warm-rolling; The magnesium alloy plate surface temperature is not higher than 250 ℃; Percentage pass reduction is 6～15%, and melting down annealing temperature behind each warm-rolling is between 250～350 ℃, and annealing time is 1～3h.
10. a kind of complete processing of said according to Claim 8 large-size high-tensile degree magnesium alloy plate is characterized in that when rolling, whenever roll just to change after a time and roll to 90 °, or after same direction multi-pass is rolling, change again roll to.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102922239A (en) * | 2012-11-13 | 2013-02-13 | 西部钛业有限责任公司 | Preparation method for TA5 titanium alloy bars with small specifications |
| CN102989764A (en) * | 2012-12-05 | 2013-03-27 | 河海大学 | High-yield processing method of ultra-fine crystal magnesium alloy thin plate |
| CN103008346A (en) * | 2012-12-26 | 2013-04-03 | 南京理工大学 | Magnesium alloy polyhedral circulation rolling method |
| CN103316911A (en) * | 2013-05-24 | 2013-09-25 | 燕山大学 | Magnesium alloy plate machining method |
| CN103447432A (en) * | 2013-09-04 | 2013-12-18 | 中南大学 | Isothermal die forging technique of large-sized magnesium alloy component |
| CN103882356A (en) * | 2014-03-19 | 2014-06-25 | 吉林大学 | Method for preparing fine-grained magnesium alloy with superplastic deformability |
| CN105755410A (en) * | 2016-04-20 | 2016-07-13 | 中南大学 | Production process of ultralight double-phase magnesium-lithium-alloy plate |
| CN105951011A (en) * | 2016-06-01 | 2016-09-21 | 扬州诚德重工有限公司 | Manufacturing process of large-sized high strength magnesium alloy sheets |
| CN109468560A (en) * | 2019-01-15 | 2019-03-15 | 吉林大学 | Second phase homogenization regulation preparation method in a kind of high aluminium content casting magnesium alloy plate |
| CN110877086A (en) * | 2019-12-13 | 2020-03-13 | 中国兵器工业第五九研究所 | Preparation method of fine-grain large-size magnesium alloy section |
| CN112481536A (en) * | 2020-11-04 | 2021-03-12 | 长沙新材料产业研究院有限公司 | Magnesium alloy thick plate and preparation method thereof |
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Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102922239A (en) * | 2012-11-13 | 2013-02-13 | 西部钛业有限责任公司 | Preparation method for TA5 titanium alloy bars with small specifications |
| CN102989764B (en) * | 2012-12-05 | 2015-01-14 | 河海大学 | High-yield processing method of ultra-fine crystal magnesium alloy thin plate |
| CN102989764A (en) * | 2012-12-05 | 2013-03-27 | 河海大学 | High-yield processing method of ultra-fine crystal magnesium alloy thin plate |
| CN103008346A (en) * | 2012-12-26 | 2013-04-03 | 南京理工大学 | Magnesium alloy polyhedral circulation rolling method |
| CN103316911A (en) * | 2013-05-24 | 2013-09-25 | 燕山大学 | Magnesium alloy plate machining method |
| CN103316911B (en) * | 2013-05-24 | 2015-03-25 | 燕山大学 | Magnesium alloy plate machining method |
| CN103447432A (en) * | 2013-09-04 | 2013-12-18 | 中南大学 | Isothermal die forging technique of large-sized magnesium alloy component |
| CN103447432B (en) * | 2013-09-04 | 2015-09-09 | 中南大学 | A kind of isothermal forging process of large scale magnesium alloy parts |
| CN103882356A (en) * | 2014-03-19 | 2014-06-25 | 吉林大学 | Method for preparing fine-grained magnesium alloy with superplastic deformability |
| CN103882356B (en) * | 2014-03-19 | 2016-01-20 | 吉林大学 | A kind of preparation method with superplastic deformation ability close grain magnesium alloy |
| CN105755410A (en) * | 2016-04-20 | 2016-07-13 | 中南大学 | Production process of ultralight double-phase magnesium-lithium-alloy plate |
| CN105951011A (en) * | 2016-06-01 | 2016-09-21 | 扬州诚德重工有限公司 | Manufacturing process of large-sized high strength magnesium alloy sheets |
| CN109468560A (en) * | 2019-01-15 | 2019-03-15 | 吉林大学 | Second phase homogenization regulation preparation method in a kind of high aluminium content casting magnesium alloy plate |
| CN110877086A (en) * | 2019-12-13 | 2020-03-13 | 中国兵器工业第五九研究所 | Preparation method of fine-grain large-size magnesium alloy section |
| CN112481536A (en) * | 2020-11-04 | 2021-03-12 | 长沙新材料产业研究院有限公司 | Magnesium alloy thick plate and preparation method thereof |
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Application publication date: 20120718 |