CN101130843B - High-strength heat-resistant magnesium alloy and smelting method thereof - Google Patents
High-strength heat-resistant magnesium alloy and smelting method thereof Download PDFInfo
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Abstract
The present invention relates to a high-strength heat-resistant magnesium alloy. Its composition contains (by wt%) 8-16% of Y, 2-4.5% of Nd, and the rest is Mg. Besides, said invention also provides its preparation method and concrete operation steps.
Description
Technical field
The present invention relates to a kind of high-strength heat-resistant magnesium alloy and melting method thereof.The category that belongs to industrial magnesium alloy.
Background technology
At present, along with energy-conserving and environment-protective and automotive performance promote improving constantly of requiring, magnesium alloy is because little, the specific tenacity specific rigidity height of density, good casting property, especially be easy to die cast, remove this and also have good damping property and be easy to advantage such as recovery, present flourish gesture in the application of automotive industry.The continuous expansion of on automobile, using along with magnesium alloy, component are to the structural part and the functional part development of critical positions such as engine support, piston, wheel hub as from original gear box casing, panel board, car door etc., people also satisfy the various different magnesium alloy that require in exploitation, as high-strength and high ductility heat resistance magnesium alloy, high temperature and creep resistance corrosion-resistant magnesium alloy etc.
Traditional magnesium alloy such as AZ91D, AM60B, AS41, AE42 etc. have obtained to use widely, still are several magnesium alloy of present application quantity maximum.But these alloys all have some shortcoming, for example the intensity in temperature more than 250 ℃ very low (≤100MPa), corrosion resistance is poor, creep-resistant property low (AZ91D, AM60B).Restricting the application of magnesium alloy on vitals such as engine.
Summary of the invention
The purpose of this invention is to provide a kind of high-strength heat-resistant magnesium alloy.It can satisfy the requirement of higher mechanical property and high-temperature creep resistance, has the corrosion resistance more much higher than existing magnesium alloy.
Another object of the present invention provides a kind of melting method of high-strength heat-resistant magnesium alloy.
For achieving the above object, the present invention takes following technical scheme:
A kind of high-strength heat-resistant magnesium alloy, the component content of this magnesium alloy is: the content of Y is 7～16wt%, and the content of Nd is 2～4.5wt%, and all the other are Mg.
In high-strength heat-resistant magnesium alloy of the present invention, the optimum content of described Y is 8～13wt%, and the optimum content of Nd is 2.2～3.8wt%.
A kind of melting method of high-strength heat-resistant magnesium alloy, this method comprises the steps:
(1), gets the raw materials ready by the weight percent of the composition of magnesium alloy of the present invention;
(2), preheating oven is warmed up to 160～660 ℃, and smelting furnace is warmed up to 500～800 ℃, and feeds shielding gas to smelting furnace;
(3), in preheating oven, pure magnesium ingot is preheating to 100～600 ℃, simultaneously pure Y ingot and pure Nd ingot are preheating to 100～500 ℃;
(4), in the smelting furnace of preheating, carry out the melting of pure magnesium ingot, the preheating pure magnesium ingot that at first will account for the fusing weight 1/2～1/20 of 1 smelting furnace adds in the smelting furnace, make its fusing fully under the protection of shielding gas, join remaining preheating pure magnesium ingot in the smelting furnace then in batches, after a collection of preheating pure magnesium ingot melts before treating, add the next batch preheated magnesium ingot again, every batch of add-on is submerged in the magnesium melt fully with pure magnesium ingot and is as the criterion; So repeat, reach preset value, after the fusing, the scum silica frost of molten surface is cleaned out fully, temperature is controlled at 680～860 ℃ until the pure magnesium ingot add-on;
(5), the pure Y ingot after the preheating and pure Nd ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, adding charging basket is that soft steel or high chromium steel are made, and is thick with a large amount of apertures on it, is convenient to dissolving and the diffusion of Y and Nd;
(6), the magnesium melt temperature is controlled at 720～860 ℃, treat that Y and Nd dissolve fully after, 750～860 ℃ of insulations 10～60 minutes, alloying element Y and Nd are evenly distributed in the magnesium melt again;
(7), last, the magnesium alloy liquation is poured in the permanent mold casting mould of abundant preheating or the sand mold casting mould is frozen into ingot casting or foundry goods; Perhaps the magnesium alloy liquation is transported in the crystallizer, carries out continuously or semicontinuous casting; Perhaps the magnesium alloy liquation is poured in extrusion casting machine or the pressure die-casting machine in batches extrusion casting or be cast into foundry goods according to casting weight.
In the melting method of magnesium alloy of the present invention, described shielding gas is preferably and contains 0.2～0.5 volume %SF
6N
2Be designated hereinafter simply as shielding gas (0.2～0.5%SF
6+ N
2).
Advantage of the present invention is: magnesium alloy of the present invention can satisfy the requirement of higher mechanical property and high-temperature creep resistance, has the corrosion resistance more much higher than existing magnesium alloy.
Embodiment
Embodiment 1:1000 kilogram Mg-10Y-3Nd magnesium alloy smelting method.
1, melting is prepared
Connect the power supply of preheating oven, smelting furnace, heat up.Preheating oven is warmed up to 420～460 ℃, smelting furnace is warmed up to 600～620 ℃, in smelting furnace, feed shielding gas (0.2～0.5%SF
6+ N
2).
2, pure magnesium ingot, pure Y ingot and the preheating of pure Nd ingot
Adopt preheating oven that 880 kilograms of pure magnesium ingots of surface cleaning, 102 kilograms of pure Y ingots and 31 kilograms of pure Nd ingots are preheating to 260～360 ℃, wherein pure Y ingot and pure Nd ingot is contained in Y and Nd adds in the charging basket is put into the preheating oven preheating together with adding charging basket.Add charging basket and adopt the thick Cr13 steel plate of 3mm to be processed into, on steel plate, get out the aperture of a large amount of Φ 5mm, make it into sieve-like.
3, pure magnesium ingot fusing
The pure magnesium ingot that at first adds 80～90 kilograms of surface cleanings makes it in aforementioned mixed gas protected fusing fully down, and the pure magnesium ingot that in batches will be preheating to design temperature then joins in the smelting furnace.Add about 25～40 kilograms the 1st time, concrete add-on is submerged in fully in the magnesium liquid with magnesium ingot and is as the criterion; Add the 2nd batch of preheated magnesium ingot until completely melted again, add-on still is submerged in fully in the magnesium liquid with magnesium ingot and is as the criterion; So repeatedly, reach 880 kilograms of preset values, after the fusing, the scum silica frost of molten surface is cleaned out fully, temperature is controlled at 760～780 ℃ with the spoon of skimming until the magnesium ingot add-on.
4, alloying
Pure Y ingot after the preheating and pure Nd ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, the magnesium melt temperature is controlled at 780～790 ℃, after treating that Y and Nd dissolve fully, under this temperature, be incubated 30～40 minutes again, alloying element Y and Nd are evenly distributed in the magnesium melt;
5, cast
With the melt transfer pump magnesium alloy liquation is poured in the permanent mold casting mould of abundant preheating and is frozen into ingot casting.So far melting finishes.
Mg-10Y-3Nd magnesium alloy of the present invention has following performance after Overheating Treatment: the room temperature tensile strength sigma
bBe 360～380MPa, yield strength σ
0.2Be 280～290Mpa; Tensile strength sigma in the time of 250 ℃
bBe 300～310Mpa; 250 ℃, 200Mpa stress continue to load 10 hours, and the creep strain of generation is less than 0.2%; Neutral salt spray test salt fog resistance corrodibility, weightlessness≤0.11mg/cm
2.24 hour.
Embodiment 2:1000 kilogram Mg-8Y-3.7Nd magnesium alloy smelting method.
1, melting is prepared
Connect the power supply of preheating oven, smelting furnace, heat up.Preheating oven is warmed up to 420～460 ℃, smelting furnace is warmed up to 600～620 ℃, in smelting furnace, feed shielding gas (0.2～0.5%SF
6+ N
2).
2, pure magnesium ingot, pure Y ingot and the preheating of pure Nd ingot
Adopt preheating oven that 900 kilograms of pure magnesium ingots of surface cleaning, 82 kilograms of pure Y ingots and 38 kilograms of pure Nd ingots are preheating to 260～360 ℃, wherein pure Y ingot and pure Nd ingot is contained in Y and Nd adds in the charging basket is put into the preheating oven preheating together with adding charging basket.Add charging basket and adopt the thick Cr13 steel plate of 3mm to be processed into, on steel plate, get out the aperture of a large amount of Φ 5mm, make it into sieve-like.
3, pure magnesium ingot fusing
The pure magnesium ingot that at first adds 80～90 kilograms of surface cleanings makes it in aforementioned mixed gas protected fusing fully down, and the pure magnesium ingot that in batches will be preheating to design temperature then joins in the smelting furnace.Add about 25～40 kilograms the 1st time, concrete add-on is submerged in fully in the magnesium liquid with magnesium ingot and is as the criterion; Add the 2nd batch of preheated magnesium ingot until completely melted again, add-on still is submerged in fully in the magnesium liquid with magnesium ingot and is as the criterion; So repeatedly, reach 900 kilograms of preset values, after the fusing, the scum silica frost of molten surface is cleaned out fully, temperature is controlled at 760～780 ℃ with the spoon of skimming until the magnesium ingot add-on.
4, alloying
Pure Y ingot after the preheating and pure Nd ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, the magnesium melt temperature is controlled at 780～790 ℃, after treating that Y and Nd dissolve fully, under this temperature, be incubated 30～40 minutes again, alloying element Y and Nd are evenly distributed in the magnesium melt;
5, cast
With the melt transfer pump magnesium alloy liquation is transported in the crystallizer, carries out semicontinuous casting, be prepared into the billet that press working is used.
Has following performance after Mg-8Y-3.7Nd magnesium alloy process deformation processing of the present invention and the thermal treatment: the room temperature tensile strength sigma
bBe 415～425MPa, yield strength σ
0.2Be 305～325Mpa; Tensile strength sigma in the time of 250 ℃
bBe 290～310Mpa; 250 ℃, 200Mpa stress continue to load 10 hours, and the creep strain of generation is less than 0.2%; Neutral salt spray test salt fog resistance corrodibility, weightlessness≤0.11mg/cm
2.24 hour.
Embodiment 3:1000 kilogram Mg-13Y-2.5Nd magnesium alloy smelting method.
1, melting is prepared
Connect the power supply of preheating oven, smelting furnace, heat up.Preheating oven is warmed up to 420～460 ℃, smelting furnace is warmed up to 600～620 ℃, in smelting furnace, feed shielding gas (0.2～0.5%SF
6+ N
2).
2, pure magnesium ingot, pure Y ingot and the preheating of pure Nd ingot
Adopt preheating oven that 850 kilograms of pure magnesium ingots of surface cleaning, 132 kilograms of pure Y ingots and 27 kilograms of pure Nd ingots are preheating to 260～360 ℃, wherein pure Y ingot and pure Nd ingot is contained in Y and Nd adds in the charging basket is put into the preheating oven preheating together with adding charging basket.Add charging basket and adopt the thick Cr13 steel plate of 3mm to be processed into, on steel plate, get out the aperture of a large amount of Φ 5mm, make it into sieve-like.
3, pure magnesium ingot fusing
The pure magnesium ingot that at first adds 80～90 kilograms of surface cleanings makes it in aforementioned mixed gas protected fusing fully down, and the pure magnesium ingot that in batches will be preheating to design temperature then joins in the smelting furnace.Add about 25～40 kilograms the 1st time, concrete add-on is submerged in fully in the magnesium liquid with magnesium ingot and is as the criterion; Add the 2nd batch of preheated magnesium ingot until completely melted again, add-on still is submerged in fully in the magnesium liquid with magnesium ingot and is as the criterion; So repeatedly, reach 840 kilograms of preset values, after the fusing, the scum silica frost of molten surface is cleaned out fully, temperature is controlled at 760～780 ℃ with the spoon of skimming until the magnesium ingot add-on.
4, alloying
Pure Y ingot after the preheating and pure Nd ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, the magnesium melt temperature is controlled at 800～810 ℃, after treating that Y and Nd dissolve fully, under this temperature, be incubated 30～40 minutes again, alloying element Y and Nd are evenly distributed in the magnesium melt;
5, casting
According to casting weight, with the melt transfer pump magnesium alloy liquation is poured in the extrusion casting machine in batches, extrusion casting becomes foundry goods.
Has following performance after Mg-13Y-2.5Nd magnesium alloy process extrusion casting moulding of the present invention and the thermal treatment: its room temperature tensile strength sigma
bBe 370～390MPa, yield strength σ
0.2Be 305～315Mpa; Tensile strength sigma in the time of 250 ℃
bBe 300～320Mpa; 250 ℃, 200Mpa stress continue to load 10 hours, and the creep strain of generation is less than 0.2%; Neutral salt spray test salt fog resistance corrodibility, weightlessness≤0.11mg/cm
2.24 hour.
Embodiment 4:1000 kilogram Mg-16Y-4.5Nd magnesium alloy smelting method.
1, melting is prepared
Connect the power supply of preheating oven, smelting furnace, heat up.Preheating oven is warmed up to 420～460 ℃, smelting furnace is warmed up to 600～620 ℃, in smelting furnace, feed shielding gas (0.2～0.5%SF
6+ N
2).
2, pure magnesium ingot, pure Y ingot and the preheating of pure Nd ingot
Adopt preheating oven that 800 kilograms of pure magnesium ingots of surface cleaning, 165 kilograms of pure Y ingots and 47 kilograms of pure Nd ingots are preheating to 260～360 ℃, wherein pure Y ingot and pure Nd ingot is contained in Y and Nd adds in the charging basket is put into the preheating oven preheating together with adding charging basket.Add charging basket and adopt the thick Cr13 steel plate of 3mm to be processed into, on steel plate, get out the aperture of a large amount of Φ 5mm, make it into sieve-like.
3, pure magnesium ingot fusing
The pure magnesium ingot that at first adds 80～90 kilograms of surface cleanings makes it in aforementioned mixed gas protected fusing fully down, and the pure magnesium ingot that in batches will be preheating to design temperature then joins in the smelting furnace.Add about 25～40 kilograms the 1st time, concrete add-on is submerged in fully in the magnesium liquid with magnesium ingot and is as the criterion; Add the 2nd batch of preheated magnesium ingot until completely melted again, add-on still is submerged in fully in the magnesium liquid with magnesium ingot and is as the criterion; So repeatedly, reach 800 kilograms of preset values, after the fusing, the scum silica frost of molten surface is cleaned out fully, temperature is controlled at 760～780 ℃ with the spoon of skimming until the magnesium ingot add-on.
4, alloying
Pure Y ingot after the preheating and pure Nd ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, the magnesium melt temperature is controlled at 800～810 ℃, after treating that Y and Nd dissolve fully, under this temperature, be incubated 30～40 minutes again, alloying element Y and Nd are evenly distributed in the magnesium melt;
5, casting
According to casting weight, with the melt transfer pump magnesium alloy liquation is poured in the extrusion casting machine in batches, extrusion casting becomes foundry goods.
Have following performance after Mg-16Y-4.5Nd magnesium alloy process casting of the present invention and the thermal treatment:
Its room temperature tensile strength sigma
bBe 350～370MPa, yield strength σ
0.2Be 315～325Mpa; Tensile strength sigma in the time of 250 ℃
bBe 300～320Mpa; 250 ℃, 250Mpa stress continue to load 10 hours, and the creep strain of generation is less than 0.2%; Neutral salt spray test salt fog resistance corrodibility, weightlessness≤0.11mg/cm
2.24 hour.
Claims (3)
1. high-strength heat-resistant magnesium alloy, it is characterized in that: the component content of this magnesium alloy is: the content of Y is 7～16wt%, and the content of Nd is 2.5～4.5wt%, and all the other are Mg, and this magnesium alloy adopts following melting method to make:
(1), gets the raw materials ready by the weight percent of the composition of above-mentioned magnesium alloy;
(2), preheating oven is warmed up to 160～660 ℃, and smelting furnace is warmed up to 500～800 ℃, and feeds shielding gas to smelting furnace;
(3), in preheating oven, pure magnesium ingot is preheating to 100～600 ℃, simultaneously pure Y ingot and pure Nd ingot are preheating to 100～500 ℃;
(4), in the smelting furnace of preheating, carry out the melting of pure magnesium ingot, the preheating pure magnesium ingot that at first will account for the fusing weight 1/2～1/20 of 1 smelting furnace adds in the smelting furnace, make its fusing fully under the protection of shielding gas, join remaining preheating pure magnesium ingot in the smelting furnace then in batches, after a collection of preheating pure magnesium ingot melts before treating, add the next batch preheated magnesium ingot again, every batch of add-on is submerged in the magnesium melt fully with pure magnesium ingot and is as the criterion; So repeat, reach preset value, after the fusing, the scum silica frost of molten surface is cleaned out fully, temperature is controlled at 680～860 ℃ until the pure magnesium ingot add-on;
(5), the pure Y ingot after the preheating and pure Nd ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, adding charging basket is that soft steel or high chromium steel are made, and is thick with a large amount of apertures on it, is convenient to dissolving and the diffusion of Y and Nd;
(6), the magnesium melt temperature is controlled at 720～860 ℃, treat that Y and Nd dissolve fully after, 750～860 ℃ of insulations 10～60 minutes, alloying element Y and Nd are evenly distributed in the magnesium melt again;
(7), last, the magnesium alloy liquation is poured in the permanent mold casting mould of abundant preheating or the sand mold casting mould is frozen into ingot casting or foundry goods; Perhaps the magnesium alloy liquation is transported in the crystallizer, carries out continuously or semicontinuous casting; Perhaps the magnesium alloy liquation is poured in extrusion casting machine or the pressure die-casting machine in batches extrusion casting or be cast into foundry goods according to casting weight.
2. the melting method of the described magnesium alloy of claim 1, it is characterized in that: this method comprises the steps:
(1), gets the raw materials ready by the weight percent of the composition of the described magnesium alloy of claim 1;
(2), preheating oven is warmed up to 160～660 ℃, and smelting furnace is warmed up to 500～800 ℃, and feeds shielding gas to smelting furnace;
(3), in preheating oven, pure magnesium ingot is preheating to 100～600 ℃, simultaneously pure Y ingot and pure Nd ingot are preheating to 100～500 ℃;
(4), in the smelting furnace of preheating, carry out the melting of pure magnesium ingot, the preheating pure magnesium ingot that at first will account for the fusing weight 1/2～1/20 of 1 smelting furnace adds in the smelting furnace, make its fusing fully under the protection of shielding gas, join remaining preheating pure magnesium ingot in the smelting furnace then in batches, after a collection of preheating pure magnesium ingot melts before treating, add the next batch preheated magnesium ingot again, every batch of add-on is submerged in the magnesium melt fully with pure magnesium ingot and is as the criterion; So repeat, reach preset value, after the fusing, the scum silica frost of molten surface is cleaned out fully, temperature is controlled at 680～860 ℃ until the pure magnesium ingot add-on;
(5), the pure Y ingot after the preheating and pure Nd ingot are submerged in the magnesium melt together with the charging basket that adds that holds them, adding charging basket is that soft steel or high chromium steel are made, and is thick with a large amount of apertures on it, is convenient to dissolving and the diffusion of Y and Nd;
(6), the magnesium melt temperature is controlled at 720～860 ℃, treat that Y and Nd dissolve fully after, 750～860 ℃ of insulations 10～60 minutes, alloying element Y and Nd are evenly distributed in the magnesium melt again;
(7), last, the magnesium alloy liquation is poured in the permanent mold casting mould of abundant preheating or the sand mold casting mould is frozen into ingot casting or foundry goods; Perhaps the magnesium alloy liquation is transported in the crystallizer, carries out continuously or semicontinuous casting; Perhaps the magnesium alloy liquation is poured in extrusion casting machine or the pressure die-casting machine in batches extrusion casting or be cast into foundry goods according to casting weight.
3. the melting method of magnesium alloy according to claim 2, it is characterized in that: described shielding gas is for containing 0.2～0.5 volume %SF
6N
2
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| CN101130843B true CN101130843B (en) | 2010-10-06 |
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| CN105400972B (en) * | 2015-11-30 | 2017-07-11 | 贵州航天风华精密设备有限公司 | A kind of process for smelting magnesium alloy |
| CN106834766B (en) * | 2015-12-03 | 2018-11-30 | 北京有色金属研究总院 | A method of preparing large scale high alloy constituent content magnesium alloy ingot |
| CN114540653B (en) * | 2022-02-24 | 2022-11-25 | 惠州云海镁业有限公司 | High-corrosion-resistance magnesium alloy processing technology |
| CN115449680B (en) * | 2022-08-17 | 2023-05-19 | 深圳市飞航精工科技有限公司 | Corrosion-resistant magnesium alloy material and preparation method thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4401621A (en) * | 1981-03-25 | 1983-08-30 | Magnesium Elektron Limited | Magnesium alloys |
| CN1717500A (en) * | 2003-10-10 | 2006-01-04 | 镁电子有限公司 | Castable magnesium alloys |
-
2006
- 2006-08-25 CN CN2006101126271A patent/CN101130843B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4401621A (en) * | 1981-03-25 | 1983-08-30 | Magnesium Elektron Limited | Magnesium alloys |
| CN1717500A (en) * | 2003-10-10 | 2006-01-04 | 镁电子有限公司 | Castable magnesium alloys |
Non-Patent Citations (3)
| Title |
|---|
| CN 1717500 A,全文. |
| Shotaro Morozumi ,Hiroshi Saikawa.Tensile Properties of Internally Hydrided andT6-TreatedMg-10%Y-2%Nd Alloys at Elevated temperatures.Materials Transactions42 7.2001,42(7),1268-1272. |
| Shotaro Morozumi,Hiroshi Saikawa.Tensile Properties of Internally Hydrided andT6-TreatedMg-10%Y-2%Nd Alloys at Elevated temperatures.Materials Transactions42 7.2001,42(7),1268-1272. * |
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