CN107974599A - A kind of manufacture method of low-cost rare earth cast magnesium alloy and its casting - Google Patents

A kind of manufacture method of low-cost rare earth cast magnesium alloy and its casting Download PDF

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Publication number
CN107974599A
CN107974599A CN201711140742.4A CN201711140742A CN107974599A CN 107974599 A CN107974599 A CN 107974599A CN 201711140742 A CN201711140742 A CN 201711140742A CN 107974599 A CN107974599 A CN 107974599A
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CN
China
Prior art keywords
casting
magnesium alloy
rare earth
low
cast magnesium
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CN201711140742.4A
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Chinese (zh)
Inventor
肖旅
杨力祥
王先飞
陈舸
李中权
袁勇
李宝辉
田莹
孔振
邹文兵
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Shanghai Space Precision Machinery Research Institute
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Shanghai Space Precision Machinery Research Institute
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Priority to CN201711140742.4A priority Critical patent/CN107974599A/en
Publication of CN107974599A publication Critical patent/CN107974599A/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C23/00—Alloys based on magnesium
    • C22C23/06—Alloys based on magnesium with a rare earth metal as the next major constituent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/02—Making non-ferrous alloys by melting
    • C22C1/03—Making non-ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C1/00—Making non-ferrous alloys
    • C22C1/06—Making non-ferrous alloys with the use of special agents for refining or deoxidising
    • 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
    • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
    • C22F1/06—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of magnesium or alloys based thereon

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The invention discloses the manufacture method of a kind of low-cost rare earth cast magnesium alloy and its casting, each component and its weight percent content are in the magnesium alloy：Y 1.8~3.2%, Sm 0.4~2.2%, Gd 1.0~2.8%, Zr 0.4~1.0%, and the sum of mass percent of Y, Gd and Sm, between 4.0~6.5%, Mg is surplus.Compared with prior art, magnesium-rare earth of the present invention employs cheap rare earth element, total amount of rare earth is low and possesses certain ageing strengthening ability, all kinds of metallurgical imperfection formabilities are low in casting process at the same time, compared with other rare earth cast magnesium alloys, its casting manufactured has the advantage that raw material are low with process costs, qualification rate is high, cost-effective.

Description

A kind of manufacture method of low-cost rare earth cast magnesium alloy and its casting
Technical field
The present invention relates to a kind of magnesium alloy of technical field of metal material, is specifically a kind of low-cost rare earth casting magnesium The manufacture method of alloy and its casting.
Background technology
Magnesium alloy has the advantages that low-density, high specific strength, has widely in aerospace, military project and major industrial circle Using.Cast magnesium alloy is suitable for liquid forming, available for manufacture complex thin-wall component.Existing domestic and international cast magnesium alloy In, magnesium alloy containing aluminum casting and cast magnesium alloy containing zirconium can be divided into.Magnesium alloy containing aluminum casting in order to reach certain mechanical property, High aluminium content is generally used, freezing range is wide, has and forms Micro shrinkage, the tendency of inverse segregation, and casting forming process is poor, The process costs for manufacturing large-scale complex thin-wall component are high.Cast magnesium alloy containing zirconium generally strengthens member using zinc and rare earth as main Element, wider with the cast magnesium alloy freezing range ratio magnesium alloy containing aluminum casting of iron fortified, casting forming process is worse；It is existing with For the cast magnesium alloy of rare earth reinforced in order to pursue high-performance, content of rare earth is higher, causes material cost to increase substantially, and casting Easily brittle, qualification rate is not high, also results in casting totle drilling cost height, is unfavorable for the industrial applications of product.
Therefore, by design of alloy, exploitation content of rare earth is low, casting forming process is outstanding, good mechanical properties Cast magnesium alloy, the qualification rate and quality of Mg alloy castings can be increased substantially, so as to reduce the raw material of Mg alloy castings Cost and manufacture cost, the final comprehensive manufacture cost for reducing Mg alloy castings.To expanding cast magnesium alloy application field, have Particularly important meaning.
Currently without the explanation or report for finding technology similar to the present invention, money similar both at home and abroad is also not yet searched Material.
The content of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide a kind of low-cost rare earth cast magnesium alloy and its casting The manufacture method of part；The cast magnesium alloy is by controlling the content of main rare earth alloy element to adjust at the same time in relatively low level With the relatively low rare earth element ratio of the prime cost such as Y, Gd, Sm, alloy is set still to possess ageing strengthening ability.It is simultaneously as dilute Native content reduces, and the casting forming process of alloy significantly improves, and being integrated in casting in cost and quality has significant advantage.
The present invention is achieved by the following technical solutions：
A kind of low-cost rare earth cast magnesium alloy, each component and its weight percent content are in the magnesium alloy：
Y 1.8~3.2%；Gd 1.0~2.8%；Sm 0.4~2.2%；Zr 0.4~1.0%；And the matter of Y, Gd and Sm The sum of percentage is measured between 4.0~6.5%；Surplus is Mg.
Present invention also offers a kind of manufacture method of the casting of above-mentioned nearly low-cost rare earth cast magnesium alloy, including such as Lower step：
S1, by the mass percent in above-mentioned formula weigh each raw material, and preheats；
S2, by the raw material melting after the completion of preheating, uniformly mixing；Poured into a mould after covering, refining treatment, obtain original cast Green casting；
S3, the original cast green casting to gained carry out solution treatment, cooling, ageing treatment, cooling successively, up to it is low into The spray of this rare earth cast magnesium alloy.
Preferably, the temperature preheated in the step S1 is 200 DEG C, when the time is 8 small.
Preferably, the coverture used is covered in the step S2 as JDMF, refines the refining agent used as RJ6, is poured into a mould Temperature be 680 DEG C~710 DEG C.
Preferably, the condition of solution treatment is in the step S3：When processing 20~30 is small at 400~450 DEG C；When described Imitating the condition handled is：When processing 50~100 is small at 150~190 DEG C.
Preferably, the cooling of the step S3 is by the way of natural cooling in atmosphere.
Compared with prior art, the casting manufactured using low-cost rare earth cast magnesium alloy of the present invention, is being possessed and routine While Mg alloy castings suitable mechanical property and the cost of raw material, formed shrink class defect and segregation tendency it is low, cast Technology difficulty significantly reduces, and is adapted to heavy industrialization batch production.
Embodiment
Elaborate below to the embodiment of the present invention：The present embodiment is carried out lower premised on technical solution of the present invention Implement, give detailed embodiment and process, but protection scope of the present invention is not limited to the conjunction that following embodiments is enumerated Golden component.
Embodiment 1
Smelting and pouring prepares the low-cost rare earth that mass percent is Mg-1.8%Y-1.1%Gd-1.1%Sm-0.4%Zr Cast magnesium alloy, comprises the following steps：
Step 1, weighed pure magnesium, foundry returns, Mg-Gd intermediate alloys, Mg-Y intermediate alloys, Mg- by above-mentioned mass percent Sm intermediate alloys, Mg-Zr intermediate alloys, and all raw material weighed is preheated at 200 DEG C, when processing 8 is small；
Step 2, will preheat complete raw material using crucible electrical resistance furnace carry out melting, add coverture JDMF covered, After refining agent RJ6 carries out refining treatment, each alloying component is uniformly mixed, removal of inclusions, poured into a mould at 710 DEG C, obtained former Begin casting green casting；
Step 3, carry out the original cast green castings of gained at 400 DEG C solution treatment, processing time for 300 it is small when, it is empty It is cold；Ageing treatment is carried out at 150 DEG C, it is air-cooled when processing time is 100 small, obtain spray.
After testing, the mechanical castings of the low-cost rare earth cast magnesium alloy manufacture obtained by the present embodiment are good, casting Body sampling performance can stably reach：R at room temperaturem>=200MPa, A >=6%, and casting qualified rate are high.
Embodiment 2
Smelting and pouring prepares the low-cost rare earth that mass percent is Mg-2.5%Y-0.7%Gd-1.8%Sm-0.7%Zr Cast magnesium alloy, comprises the following steps：
Step 1, weighed pure magnesium, foundry returns, Mg-Gd intermediate alloys, Mg-Y intermediate alloys, Mg- by above-mentioned mass percent Sm intermediate alloys, Mg-Zr intermediate alloys, and by all raw material weighed when 200 DEG C of the pre-heat treatments 8 are small；
Raw material after the pre-heat treatment, is used crucible electrical resistance furnace melting by S2, is added coverture JDMF and is covered, is smart After refining agent RJ6 progress refining treatments, each alloying component is uniformly mixed, removal of inclusions, poured into a mould at 690 DEG C, obtained original Cast green casting；
Step 3, carry out the original cast green castings of gained at 430 DEG C solution treatment, processing time for 25 it is small when, it is empty It is cold；Ageing treatment is carried out at 170 DEG C, it is air-cooled when processing time is 75 small, obtain spray.
After testing, the mechanical castings of the present embodiment low-cost rare earth cast magnesium alloy manufacture are good, and casting body takes Sample performance can stably reach：R at room temperaturem>=240MPa, A >=4%, and casting qualified rate are high.
Embodiment 3
Smelting and pouring prepares the low-cost rare earth that mass percent is Mg-3.2%Y-2.8%Gd-0.5%Sm-1.0%Zr Cast magnesium alloy, comprises the following steps：
Step 1, weighed pure magnesium, foundry returns, Mg-Gd intermediate alloys, Mg-Y intermediate alloys, Mg- by above-mentioned mass percent Sm intermediate alloys, Mg-Zr intermediate alloys.All raw material is when 200 DEG C of the pre-heat treatments 8 are small.
Raw material after the pre-heat treatment, is used crucible electrical resistance furnace melting by step 2, is added coverture JDMF and is covered After lid, refining agent RJ6 carry out refining treatment, each alloying component is uniformly mixed, removal of inclusions, poured into a mould, obtained at 680 DEG C Original cast green casting.
Step 3, carry out the original cast green castings of gained at 450 DEG C solution treatment, processing time for 20 it is small when, it is empty It is cold；Ageing treatment is carried out at 190 DEG C, it is air-cooled when processing time is 50 small, obtain spray.
After testing, the mechanical castings of the present embodiment low-cost rare earth cast magnesium alloy manufacture are good, and casting body takes Sample performance can stably reach：R at room temperaturem>=250MPa, A >=3%, and casting qualified rate are high.
Comparative example 1
This comparative example is the comparative example of embodiment 1, and the present embodiment is related to a kind of low-cost rare earth cast magnesium alloy；With implementation 1 difference of example is that the mass percent of the cast magnesium alloy main alloy element is Mg-1.8%Y-1.0%Gd- 0.4%Sm-0.4%Zr, is unsatisfactory for requirement of the sum of the mass percent of Y, Gd and Sm between 4.0~6.5%；
After testing, the casting qualified rate of this comparative example low-cost rare earth cast magnesium alloy manufacture is high, but mechanical property is too low, Casting body sampling performance stably reaches：σ at room temperatureb>=150MPa, δ5>=6%.
Comparative example 2
This comparative example is the comparative example of embodiment 2, and the present embodiment is related to a kind of low-cost rare earth cast magnesium alloy；With implementation Example 2 the difference is that only the cast magnesium alloy casting without heat treatment；
The casting qualified rate that this manufactures example low-cost rare earth cast magnesium alloy is high, but mechanical property is too low, casting body Sampling performance stably reaches：σ at room temperatureb>=170MPa, δ5>=4%.
Comparative example 3
This comparative example is the comparative example of embodiment 3, and the present embodiment is related to a kind of cast magnesium alloy；It is different from embodiment 3 it The mass percent being in the cast magnesium alloy main alloy element is Mg-3.2%Y-2.8%Gd-2.2%Sm-1.0% Zr, is unsatisfactory for requirement of the sum of the mass percent of Y, Gd and Sm between 4.0~6.5%.
The good mechanical properties of this comparative example cast magnesium alloy, but the cost of raw material is higher, and casting qualified rate is not high, makes It is higher into comprehensive cost.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow Ring the substantive content of the present invention.

Claims (6)

1. a kind of low-cost rare earth cast magnesium alloy, it is characterised in that each component and its weight percent content in the magnesium alloy For：
Y 1.8~3.2%；
Gd 1.0~2.8%；
Sm 0.4~2.2%；
Zr 0.4~1.0%；
And the sum of mass percent of Y, Gd and Sm is between 4.0~6.5%；Surplus is Mg.
A kind of 2. manufacture method of the casting of the nearly low-cost rare earth cast magnesium alloy described in claim 1, it is characterised in that bag Include following steps：
S1, the mass percent as described in claim 1 weigh each raw material, and preheat；
S2, by the raw material melting after the completion of preheating, uniformly mixing；Poured into a mould after covering, refining treatment, obtain the casting of original cast state Part；
S3, the original cast green casting to gained carry out solution treatment, cooling, ageing treatment, cooling successively, dilute up to low cost The spray of native cast magnesium alloy.
3. the manufacture method of the casting of low-cost rare earth cast magnesium alloy according to claim 2, it is characterised in that described The temperature preheated in step S1 is 200 DEG C, when the time is 8 small.
4. the manufacture method of the casting of low-cost rare earth cast magnesium alloy according to claim 2, it is characterised in that described The coverture used is covered in step S2 as JDMF, refines the refining agent used as RJ6, the temperature of cast is 680 DEG C~710 ℃。
5. the manufacture method of the casting of low-cost rare earth cast magnesium alloy according to claim 2, it is characterised in that described The condition of solution treatment is in step S3：When processing 20~30 is small at 400~450 DEG C；The condition of the ageing treatment is：150 When processing 50~100 is small at~190 DEG C.
6. the manufacture method of the casting of low-cost rare earth cast magnesium alloy according to claim 2, it is characterised in that described The cooling of step S3 is by the way of natural cooling in atmosphere.
CN201711140742.4A 2017-11-16 2017-11-16 A kind of manufacture method of low-cost rare earth cast magnesium alloy and its casting Pending CN107974599A (en)

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102628134A (en) * 2011-02-01 2012-08-08 亥姆霍兹中心盖斯特哈赫特材料及海岸研究中心有限公司 Single-phase solid solution cast or wrought magnesium alloys
CN105200293A (en) * 2015-10-27 2015-12-30 上海航天精密机械研究所 High-performance heatproof cast magnesium alloy and casting method for sand casting prepared from cast magnesium alloy
CN106399784A (en) * 2016-10-31 2017-02-15 上海航天精密机械研究所 Cast magnesium alloy with almost no eutectic solidification phase and manufacturing method of casting made of cast magnesium alloy with almost no eutectic solidification phase

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102628134A (en) * 2011-02-01 2012-08-08 亥姆霍兹中心盖斯特哈赫特材料及海岸研究中心有限公司 Single-phase solid solution cast or wrought magnesium alloys
CN105200293A (en) * 2015-10-27 2015-12-30 上海航天精密机械研究所 High-performance heatproof cast magnesium alloy and casting method for sand casting prepared from cast magnesium alloy
CN106399784A (en) * 2016-10-31 2017-02-15 上海航天精密机械研究所 Cast magnesium alloy with almost no eutectic solidification phase and manufacturing method of casting made of cast magnesium alloy with almost no eutectic solidification phase

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Application publication date: 20180501