CN100476002C - Heat resistance casting magnesium alloy and preparation method thereof - Google Patents
Heat resistance casting magnesium alloy and preparation method thereof Download PDFInfo
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- CN100476002C CN100476002C CNB2007100211553A CN200710021155A CN100476002C CN 100476002 C CN100476002 C CN 100476002C CN B2007100211553 A CNB2007100211553 A CN B2007100211553A CN 200710021155 A CN200710021155 A CN 200710021155A CN 100476002 C CN100476002 C CN 100476002C
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Abstract
A kind of heat-resistant magnesium alloy and the preparation for it, the weight percent of the components in it is: Al: 4.5- 5.5%, Mn: 0.28-0.40%, Ca: 0.8-1.2%, Sr: 0.1-0.2%, Ce: 3-4%, Zn: <=0.20 %, Si: <=0.08%, Fe: <=0.004%, Cu: <=0.008%, Ni: <=0.001%, the other impurity element<= 0.05%, the remainder is Mg. the average anti-draught intension under the casting condition of this patent is 235MPa, the bending intension is 160MPa, the extending rate after being broke is 6%, it is suitable for the production which need a higher technology standards on the heat-resistant performance, foundry performance and squirm performance.
Description
Technical field
The invention belongs to the magnesium alloy production technical field, it is good and the magnesium alloy of good creep property arranged to relate in particular to a kind of resistance toheat, castability.
Background technology
At present, the magnesium alloy that industrial melting makes can only satisfy one-side requirement, is difficult to accomplish that resistance toheat, castability, high temperature creep property take into account.Have good mechanical performance, corrosion resistance nature and castability as AZ91D, AM60B and AM50A alloy, but its high-temperature creep resistance is relatively poor, can not on temperature is higher than 125 ℃ car transmissions, uses; AE42 and AS21, because of having added RE and Si element, high-temperature creep resistance significantly improves, but the flowing property of alloy liquid is not too desirable, thereby die casting performance is relatively poor relatively, this has influence on the good article rate of final casting.With the disclosed a kind of magnesium alloy of ZL01135566.2 is example (moiety and weight percent content thereof are Al:2～6%, Mn:0.1～1.0%, Ca:0.3～2.0%, Sr:0.2～1.0%, RE:0.1～3.0%, all the other are magnesium and unavoidable impurities), though can satisfy certain foundry engieering requirement, its high temperature creep property still is difficult to satisfy to have the Foundry Production technology of wanting than hi-tech.
Summary of the invention
What the present invention will solve is exactly the problem of the high temperature creep property difference of existing magnesium alloy, provides a kind of die casting performance good and the magnesium alloy of good creep property arranged.
The weight percent of each component of the present invention is: Al:4.5～5.5%, Mn:0.28～0.40%, Ca:0.8～1.2%, Sr:0.1～0.2%, Ce:3.0～4.0%, Zn: Si≤0.20%: Fe≤0.08%: Cu≤0.004%: Ni≤0.008%: other impurity elements≤0.05%≤0.001%,, surplus are Mg.
The preparation method that the present invention adopts comprises the steps:
1, industrial magnesium ingot, aluminium ingot are dropped in the off-the-shelf clean crucible adds end flux melts, the consumption of end flux accounts for 1.5～2.5% of quality of furnace charge, be sprinkled into insulating covering agent simultaneously, the consumption of insulating covering agent accounts for 0.003～0.005% of quality of furnace charge, the whole melting process time is controlled at 2～6h, and magnesium liquid outlet temperature is controlled at 670～690 ℃;
2, fusing finishes back blowing argon gas in magnesium liquid, and adopts mechanical stirring, adds refining agent and Manganous chloride tetrahydrate simultaneously and carries out refining, and the consumption of refining agent accounts for 1.5～2.5% of quality of furnace charge, and the time is controlled at 30min, and temperature is controlled at 680～750 ℃;
Add rare-earth element cerium when 3, refining finishes back liquid magnesium alloy controlled temperature to 700～720 ℃, the time is controlled at 25min, and temperature is controlled at 700～720 ℃;
4, leave standstill cooling, make flux and inclusion sedimentation, the time is controlled at 45min, and temperature is carried out airtight transfer alloy liquid to holding furnace when reducing to 680～710 ℃; Adding aluminium calcium master alloy and aluminium strontium master alloy carry out Alloying Treatment in holding furnace then, and the melting process temperature is controlled at 660～680 ℃ all the time, and the time is controlled at 15min;
5, at last under 660～680 ℃ of temperature condition, and pour into a mould in protective atmosphere, protective atmosphere is generally SF
6, CO
2, N
2, SO
2, dry air mixed gas or mixed gas protected atmosphere, the time generally was controlled at 40～60 minutes.
Flux of the employed end among the end flux that is adopted in the above-mentioned preparation process, insulating covering agent, refining agent and the existing ordinary magnesium alloy preparation technology, insulating covering agent, refining agent are identical, no particular requirement.
The present invention passes through to add metallic element calcium, the oxidation that can alleviate the magnesium alloy liquation on the one hand, and crystal grain thinning improves the alloy creep drag on the other hand.Can also reduce the microbattery effect of magnesium alloy, improve its corrosion resistance.
The present invention is by adding the metallic element strontium, can refinement AlCa phase, improve its mechanical property and high temperature creep property to a certain extent.
The purpose of adding metallic element calcium and strontium among the present invention simultaneously mainly is to utilize the interactivity of alkaline-earth metal to eliminate monometallic to add fashionable deficiency that may occur or defective.
Adding rare-earth element cerium among the present invention, is by precipitation hardened the interaction mutually with crystal boundary its creep-resistant property to be significantly improved.Simultaneously trivalent rare earth element has improved electron density, it is interatomic in conjunction with the lining to strengthen magnesium alloy, has reduced magnesium 200～300 ℃ atomic diffusion speed.The relatively low rare earth cerium of fusing point has guaranteed that this alloy has good flowing property simultaneously.
Average tensile strength 235MPa under the as cast condition of the present invention, yield strength 160MPa, elongation after fracture 6% can further satisfy the production that resistance toheat to magnesium alloy materials, castability, creep property etc. have hi-tech more to require.
Embodiment
Below in conjunction with embodiment the present invention is further described:
Embodiment 1:
Magnesium ingot 1080kg, aluminium ingot 49.5kg are dropped in the off-the-shelf clean crucible, add flux 20kg fusing at the bottom of the RJ-2, be sprinkled into RJ-3 insulating covering agent 4kg in the process to prevent burning, the whole melting process time is controlled at 4h, and magnesium liquid outlet temperature is controlled at 670 ℃; Fusing end back blowing argon gas in magnesium liquid, and employing mechanical stirring add RJ-4 refining agent 20kg simultaneously and Manganous chloride tetrahydrate 8.2kg carries out refining, and the time is controlled at 30min, and temperature is controlled at 680 ℃; Add rare-earth element cerium 48kg during the temperature to 700 of magnesium hydraulic control afterwards ℃, the time is controlled at 25min, and temperature is controlled at 700 ℃; Thereafter leave standstill cooling, make flux and inclusion sedimentation, the time is controlled at 45min, and alloy liquid is transferred in the holding furnace, and temperature is 680 ℃ of end; Add aluminium calcium master alloy 17.6kg then and aluminium strontium master alloy 1.3kg carries out Alloying Treatment, the melting process temperature is controlled at 660 ℃ all the time, and the time is controlled at 15min; At last under 660 ℃ of temperature condition, and at SO
2Pour into a mould under the atmosphere protection, the time generally was controlled at 45 minutes.The weight percent of the chemical composition of the magnesium alloy that makes like this is Al:4.5%, Mn:0.30%, Ca:1.1%, Sr:0.10%, Ce:4.0%, Zn: Si≤0.20%: Fe≤0.08%: Cu≤0.004%: Ni≤0.008%: other impurity elements≤0.05%≤0.001%,, surplus are Mg.The average tensile strength 230MPa of present embodiment die casting coupon, yield strength 155MPa, elongation after fracture 6.5%.
Effective calcium content of the aluminium calcium master alloy that adds among the present invention generally is controlled at 72.0～78.0%, and effective strontium content of aluminium strontium master alloy generally is controlled at 87.5～91.5%.Following examples are all like this.
Since magnesium liquid leave standstill carry slag and after the deimpurity process of sedimentation in, have part material and be eliminated, add the reason of high temperature oxidation, the yield rate of making is between 95～96%.Therefore certain composition when sampling analysis, might occur and not meet the predetermined preparation requirement of alloy, at this moment should be according to predetermined prescription, the melting once more of some raw material of corresponding adding is till sampling analysis is qualified.For following embodiment above-mentioned requirement is arranged all.
Embodiment 2:
Magnesium ingot 1080kg, aluminium ingot 55.8kg are dropped in the off-the-shelf clean crucible, add flux 25kg fusing at the bottom of the RJ-2, be sprinkled into RJ-4 insulating covering agent 5kg in the process to prevent burning, the whole melting process time is controlled at 5h, and magnesium liquid outlet temperature is controlled at 680 ℃; Fusing end back blowing argon gas in magnesium liquid, and employing mechanical stirring add RJ-5 refining agent 25kg simultaneously and Manganous chloride tetrahydrate 9.6kg carries out refining, and the time is controlled at 30min, and temperature is controlled at 715 ℃; Add rare-earth element cerium 42kg during the temperature to 710 of magnesium hydraulic control afterwards ℃, the time is controlled at 25min, and temperature is controlled at 710 ℃; Thereafter leave standstill cooling, make flux and inclusion sedimentation, the time is controlled at 45min, and alloy liquid is transferred in the holding furnace, and temperature is 695 ℃ of end; Add aluminium calcium master alloy 16.0kg then and aluminium strontium master alloy 2.0kg carries out Alloying Treatment, the melting process temperature is controlled at 670 ℃ all the time, and the time is controlled at 15min; At last under 670 ℃ of temperature condition, and at CO
2Pour into a mould under the atmosphere protection, the time generally was controlled at 50 minutes.The weight percent of the chemical composition of the magnesium alloy that makes like this is Al:5.0%, Mn:0.35%, Ca:1.0%, Sr:0.15%, Ce:3.5%, Zn: Si≤0.20%: Fe≤0.08%: Cu≤0.004%: Ni≤0.008%: other impurity elements≤0.05%≤0.001%,, surplus are Mg.Average tensile strength 235MPa under the present embodiment as cast condition, yield strength 160MPa, elongation after fracture 7%.
Embodiment 3:
Magnesium ingot 1080kg, aluminium ingot 62.1kg are dropped in the off-the-shelf clean crucible, add flux 30kg fusing at the bottom of the RJ-2, be sprinkled into RJ-4 insulating covering agent 6kg in the process to prevent burning, the whole melting process time is controlled at 6h, and magnesium liquid outlet temperature is controlled at 690 ℃; Fusing end back blowing argon gas in magnesium liquid, and employing mechanical stirring add RJ-6 refining agent 30kg simultaneously and Manganous chloride tetrahydrate 11kg carries out refining, and the time is controlled at 30min, and temperature is controlled at 750 ℃; Add rare-earth element cerium 36kg during the temperature to 720 of magnesium hydraulic control afterwards ℃, the time is controlled at 25min, and temperature is controlled at 720 ℃; Thereafter leave standstill cooling, make flux and inclusion sedimentation, the time is controlled at 45min, and alloy liquid is transferred in the holding furnace, and temperature is 710 ℃ of end; Add aluminium calcium master alloy 14.4kg then and aluminium strontium master alloy 2.6kg carries out Alloying Treatment, the melting process temperature is controlled at 680 ℃ all the time, and the time is controlled at 15min; At last under 680 ℃ of temperature condition, and at SF
6Pour into a mould under the atmosphere protection, the time generally was controlled at 55 minutes.The weight percent of the chemical composition of the magnesium alloy that makes like this is Al:5.5%, Mn:0.40%, Ca:0.9%, Sr:0.20%, Ce:3.0%, Zn: Si≤0.20%: Fe≤0.08%: Cu≤0.004%: Ni≤0.008%: other impurity elements≤0.05%≤0.001%,, surplus are Mg.Average tensile strength 240MPa under the present embodiment as cast condition, yield strength 165MPa, elongation after fracture 7.5%.
Claims (2)
1, a kind of heat resistance casting magnesium alloy, the weight percent that it is characterized in that each component is: Al:4.5～5.5%, Mn:0.28～0.40%, Ca:0.8～1.2%, Sr:0.1～0.2%, Ce:3～4%, Zn: Si≤0.20%: Fe≤0.08%: Cu≤0.004%: Ni≤0.008%: other impurity elements≤0.05%≤0.001%,, surplus are Mg.
2, the preparation method of the described heat resistance casting magnesium alloy of claim 1 is characterized in that comprising the steps:
1) will add end flux melts in industrial magnesium ingot, the aluminium ingot input crucible, the consumption of end flux accounts for 1.5～2.5% of quality of furnace charge, be sprinkled into insulating covering agent simultaneously, the consumption of insulating covering agent accounts for 0.003～0.005% of quality of furnace charge, the whole melting process time is controlled at 2～6h, and magnesium liquid outlet temperature is controlled at 670～690 ℃;
2) fusing finishes back blowing argon gas in magnesium liquid, and adopts mechanical stirring, adds refining agent and Manganous chloride tetrahydrate simultaneously and carries out refining, and the consumption of refining agent accounts for 1.5～2.5% of quality of furnace charge, and the time is controlled at 30min, and temperature is controlled at 680～750 ℃;
Add rare-earth element cerium when 3) refining finishes back liquid magnesium alloy controlled temperature to 700～720 ℃, the time is controlled at 25min, and temperature is controlled at 700～720 ℃;
4) leave standstill cooling, make flux and inclusion sedimentation, the time is controlled at 45min, and temperature is carried out airtight transfer alloy liquid to holding furnace when reducing to 680～710 ℃; Adding aluminium calcium master alloy and aluminium strontium master alloy carry out Alloying Treatment in holding furnace then, and the melting process temperature is controlled at 660～680 ℃ all the time, and the time is controlled at 15min;
5) at last under 660～680 ℃ of temperature condition, and pour into a mould in protective atmosphere, protective atmosphere is SF
6, CO
2, N
2, SO
2, dry air mixed gas or mixed gas protected atmosphere, the time was controlled at 40～60 minutes.
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|---|---|---|---|
| CNB2007100211553A CN100476002C (en) | 2007-03-30 | 2007-03-30 | Heat resistance casting magnesium alloy and preparation method thereof |
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| CNB2007100211553A CN100476002C (en) | 2007-03-30 | 2007-03-30 | Heat resistance casting magnesium alloy and preparation method thereof |
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| JP5638222B2 (en) * | 2009-11-04 | 2014-12-10 | 株式会社アーレスティ | Heat-resistant magnesium alloy for casting and method for producing alloy casting |
| CN102268579B (en) * | 2011-08-02 | 2013-04-10 | 佳木斯大学 | Preparation process of heat-resistant Mg-Sr-Zn-Y alloy |
| CN103290288B (en) * | 2013-06-26 | 2015-10-07 | 重庆大学 | A kind of low cost high-ductility wrought magnesium alloy and preparation method thereof |
| CN106319314A (en) * | 2016-11-07 | 2017-01-11 | 天津东义镁制品股份有限公司 | High-speed extrusion high-strength deforming magnesium alloy and preparation method thereof |
| CN108118226B (en) * | 2016-11-30 | 2020-04-28 | 宝钢集团有限公司 | High-thermal-conductivity, corrosion-resistant and heat-resistant die-casting magnesium alloy and manufacturing method thereof |
| CN107858573A (en) * | 2017-12-11 | 2018-03-30 | 广西趣创想创客空间管理有限责任公司 | A kind of magnesium alloy and preparation method thereof |
| CN111155012B (en) * | 2020-03-17 | 2022-02-18 | 嘉丰工业科技（惠州）有限公司 | High-fluidity high-thermal conductivity rare earth magnesium alloy suitable for die-casting ultrathin parts and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5073207A (en) * | 1989-08-24 | 1991-12-17 | Pechiney Recherche | Process for obtaining magnesium alloys by spray deposition |
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Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5073207A (en) * | 1989-08-24 | 1991-12-17 | Pechiney Recherche | Process for obtaining magnesium alloys by spray deposition |
Non-Patent Citations (2)
| Title |
|---|
| 碱土镁合金的研究及开发. 李海东，彭晓东.轻金属，第6期. 2006 |
| 碱土镁合金的研究及开发. 李海东，彭晓东.轻金属，第6期. 2006 * |
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Effective date of registration: 20110621 Address after: 215125 No. 50, Jinhai Road, Suzhou Industrial Park, Jiangsu, Suzhou Patentee after: Suzhou Yunhai Magnesium Industrial Co., Ltd. Address before: 043800, Yuncheng Town, Wenxi County, Shanxi City, province, Berlin village, Wenxi sea of clouds, Pioneer Metals Corporation Patentee before: Wenxi Yunhai Metals Co., Ltd. |
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