CN107737906A - A kind of impact-resisting and heat resistant magnesium alloy structural part and preparation method thereof - Google Patents
A kind of impact-resisting and heat resistant magnesium alloy structural part and preparation method thereof Download PDFInfo
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- CN107737906A CN107737906A CN201710971550.1A CN201710971550A CN107737906A CN 107737906 A CN107737906 A CN 107737906A CN 201710971550 A CN201710971550 A CN 201710971550A CN 107737906 A CN107737906 A CN 107737906A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/16—Casting in, on, or around objects which form part of the product for making compound objects cast of two or more different metals, e.g. for making rolls for rolling mills
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
- B22D18/04—Low pressure casting, i.e. making use of pressures up to a few bars to fill the mould
Abstract
The present invention relates to a kind of impact-resisting and heat resistant magnesium alloy structural part and preparation method thereof, magnesium alloy structural part is followed successively by intermediate alloy (1) and magnesium alloy layer (2) from inside to outside；The intermediate alloy (1) is magnesium bismuth intermediate alloy；The magnesium alloy layer (2) is AM50B magnesium alloys or AM60B magnesium alloys.Preparation method comprises the following steps：S1 founding intermediate alloy billets：S11 raw materials prepare；S12 melting magnesium ingots；S13 melting bismuth ingots；S14 refining removal of impurities；S15 ingot blanks are cast；S2 prepares intermediate alloy (1)；S3 alloy meltings：S31 magnesium alloy smeltings；S32 cast magnesium alloy structural members.The magnesium alloy increases substantially in 120 DEG C~170 DEG C of creep-resistant property, can meet application of the magnesium alloy on the important components such as automatic gear-box, crankcase, gear chamber cover, oil sump, and cost is low.
Description
Technical field
The present invention relates to industrial magnesium alloys technical field, and in particular to a kind of impact-resisting and heat resistant magnesium alloy structural part and its system
Preparation Method.
Background technology
Magnesium alloy with less density (being the minimum one kind of utility structure metal Midst density) due to making it in many fields
Closing has very significant advantage.The specific strength of magnesium alloy is high, and, good heat dissipation bigger than modulus of elasticity, absorb shock resistance is good, and withstand shocks load
The corrosive nature of lotus ability resistance to organic matter bigger than aluminium alloy and alkali is good.Main alloy element has aluminium, zinc, manganese, cerium, thorium and a small amount of
Zirconium or cadmium etc..What use was most wide at present is magnesium alloy, next to that magnesium-manganese alloy and magnesium zinc zircaloy.It is mainly used in aviation, boat
My god, transport, chemical industry, the industrial department such as rocket.It is most light metal in practical metal, the proportion of magnesium is about the 2/3 of aluminium, is
The 1/4 of iron.It is the most light metal in practical metal, high intensity, high rigidity.Particularly Aeronautics and Astronautics and automobile,
There is the advantage for being difficult to substitute in terms of the vehicles lightweights such as motorcycle, high speed/light rail train.The density of component is small to be saved
The energy is saved, also there is the small advantage of inertia in the occasion of high-speed motion, this startup and braking for the vehicles has notable
Effect.
AM50B or AM60B magnesium alloys are most widely used at present, production and usage amount also maximum magnesium alloy.The magnesium closes
The outstanding feature of gold is that have excellent extrusion process performance, higher comprehensive mechanical property and cost relatively low, and this is the conjunction
Gold obtains the main reason for extensive use.But the alloy all has a disadvantage that, be exactly 120 DEG C of temperatures above surrender it is strong
Degree is remarkably decreased, creep-resistant property is especially low.Magnesium alloy is govern in automatic gear-box, crankcase, gear chamber cover, oil sump etc.
Application on automobile important component.
In the prior art, impact-resisting and heat resistant magnesium alloy cost is higher, and application is narrower.Different impact-resisting and heat resistant magnesium
The extrusion process performance change of alloy is larger, and less alloy can be accomplished both to have kept preferable shock resistance, and and can keeps preferable
Processing characteristics.
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 impact-resisting and heat resistant magnesium alloy structural part and its
Preparation method, solve the problems, such as high cost, shock resistance difference and poor processability.
The purpose of the present invention is achieved through the following technical solutions：
A kind of impact-resisting and heat resistant magnesium alloy structural part, is followed successively by intermediate alloy and magnesium alloy layer from inside to outside；
The intermediate alloy is magnesium-bismuth intermediate alloy；
The magnesium alloy layer is AM50B magnesium alloys or AM60B magnesium alloys.
Two kinds of differences are used for magnesium alloy in preparing a kind of magnesium alloy structural part, and the bismuth-containing amount of intermediate alloy is higher, impact resistance
Energy, heat resistance and processing characteristics are excellent；The AM50B magnesium alloys or the cost of AM60B magnesium alloys that magnesium alloy layer uses are relatively low,
It is less to add the amount of intermediate alloy, cost increase is less, suitable for industrialized production；The extrusion process of magnesium alloy structural part changes
Smaller, extrusion process performance is substantially suitable with AM50B magnesium alloys or AM60B magnesium alloys, meets extrusion process requirement；At 120 DEG C
~170 DEG C of yield strength, creep-resistant property increase substantially；0.1% is produced under 150 DEG C, long-time load effect in 100 hours
The creep strength during deformation of creep, by AM50B or AM60B 7~9MPa, 25~35MPa is brought up to, can meet that the magnesium closes
Application of the gold on the important components such as automatic transmission casing, high-power engine oil sump.
Magnesium is a kind of malleable silvery white non-ferrous metal of lightweight.Contain flow control eight in universe, flow control seven is contained in the earth's crust.It is close
Spend 1.74 gram per centimeters3, 648.8 DEG C of fusing point.1107 DEG C of boiling point.Chemical valence+2,7.646 electron-volts of ionization energy, be light metal it
One, there is ductility, hydrogen can be released with hot water reaction, the white light dazzle the eyes can be produced during burning, many metals are with thermal reduction
It is prepared by its salt and oxide.Magnesium metal can close with most of nonmetallic and almost all acidifying, most of alkali, and bag
Include the organic chemical including hydrocarbon, aldehyde, alcohol, phenol, amine, fat and most of oils and magnesium simply slightly or not acts as
With.Magnesium is the important materials of aircraft industry, used for magnesium alloy in manufacture airframe, engine part etc.；Magnesium is also used for manufacturing photograph
Phase and optical instrument etc.；The non-structural application of magnesium and its alloy is also very wide；Magnesium as a kind of strong reductant, be additionally operable to titanium, zirconium,
In the production of beryllium, uranium and hafnium etc..The intensity of pure magnesium is small, but magnesium alloy is good lightweight structural material, is widely used in space skill
The industrial departments such as art, aviation, automobile and instrument.One frame supersonic plane there are about 5% magnesium alloy component, and one piece of guided missile typically disappears
Consume 100~200 kilograms of magnesium alloys.Magnesium is the major components of other alloys (particularly aluminium alloy), and it coordinates energy with other elements
Enable aluminum alloy to heat treatment reinforcement；Spheroidal graphite cast-iron magnesium makees nodulizer；And some metal (such as titanium and zirconium) production magnesium reduce
Agent；Magnesium is firebomb bullet, the constituent that flare and flash bomb can not lack；Raw material necessary to magnesium powder is red-letter day fireworks；Magnesium is
Structural material or packaging material in nuclear industry；Fertiliser containing magnesium can promote plant to absorb phosphorus, and magnesium deficiency plant, which then grows, to be tended to
Stagnate.Magnesium occupies a kind of basic material of critical role in people's lives.
Bismuth is metal of the silvery white to pink, and matter is crisp easily to be crushed, and the chemical property of bismuth is relatively stable.Bismuth in nature with
The form of free metal and mineral is present.Bismuth was considered as the maximum stable element of relative atomic mass in the past, but in 2003,
It is found that bismuth has extremely faint radioactivity.Bismuth can burn when being heated to more than fusing point, send nattier blue flame, generate three oxygen
Change two bismuths, bismuth also can be with sulphur, halogen chemical combination in red heat.Bismuth is not soluble in water, insoluble in non-oxidizing sour (such as hydrochloric acid) even if
The concentrated sulfuric acid and concentrated hydrochloric acid, also simply just slightly react when common hot, but chloroazotic acid and concentrated nitric acid can be dissolved in.Wherein+5 valency compounds
NaBiO3 (sodium bismuthate) is strong oxidizer.For bismuth mainly for the manufacture of fusible alloy, melting range is 47~262 DEG C, the most frequently used
Be the metals such as the same lead of bismuth, tin, antimony, indium composition alloy, for fire plant, automatic water sprayer, boiler flame-arrester vent plug, once hair
During calamity of lighting a fire, " automatic " fusing of piston meeting of some water pipes, water is sprayed.In fire-fighting and electrical industry, as self-extinguishing
System and electrical equipment fuse, scolding tin.Non-shrinking characteristic when bismuth alloy has solidification, cast for casting printing type and high accuracy
Type.Bismuthyl carbonate and novismuth are used to treat skin injury and enterogastritis.For acolite processed, in fire-fighting and electrical safety
There is special importance on device.It is used to detect Mn in analytical chemistry.Bismuth can low-melting alloy processed, for safety shutoff or
In type metal.Bismuth category micro-virus kind.Most compounds, particularly slag salt, it is difficult in alimentary canal to absorb.Do not dissolve in
Water, only slightly it is dissolved in tissue fluid.Can not be through intact skin mucosa absorption.Bismuth is distributed in body everywhere after absorbing, most with kidney, liver time
It.The bismuth of most of storage in vivo, in several weeks so that by urine ejection in the several months.The metabolism of bismuth in vivo is similar to lead.In acid
During poisoning, tissue can discharge the bismuth of accumulation.Bismuth can interact with lead.In vivo, bismuth compound can form and be not readily dissolved in water
With the bismuth sulfide of diluted acid, precipitation is in the tissue or embolism is in capillary, and topical ulcers, or even necrosis occurs.Bismuth nitrate exists
In enteron aisle in the presence of bacterium, reducible is nitrous acid bismuth, causes methemoglobinemia after absorption.Severe chronic is poisoned
When, because bismuth is present in kidney more, serious ephritis is may occur in which, wherein most heavy with the infringement of renal cells, liver can also tire out
And.It is repeatedly oral or may occur in which " bismuth wire " through other approach slow poisoning patient.
Further, the intermediate alloy is wire rod or bar.
Further, the weight ratio of the magnesium-bismuth intermediate alloy is as follows：
Bismuth 20~70%；
Its surplus is magnesium.
Further, the weight ratio of bismuth element is 0.50~5.0% in the magnesium alloy structural part.
Using intermediate alloy as wire rod or bar in magnesium alloy structural part, the bi content of intermediate alloy is higher, can be larger
Lifted magnesium alloy shock resistance and heat resistance, after magnesium alloy structural part is made as the overall bi content of structural member compared with
Low, cost is relatively low.
The preparation method of impact-resisting and heat resistant magnesium alloy structural part, comprises the following steps：
S1 founding intermediate alloy billets：
S11 raw materials prepare：Pure magnesium ingot and pure bismuth ingot are stocked up according to percentage by weight；
S12 melting magnesium ingots：The pure magnesium ingot of the pre-heat treatment of 1/2~1/20 weight is added in the fusion crucible of melting furnace,
The pure magnesium ingot of remaining the pre-heat treatment is added in fusion crucible in batches, cleared up the scum silica frost of molten surface after melting
Totally, magnesium melt is obtained；
S13 melting bismuth ingots：The pure bismuth ingot of the pre-heat treatment is put into charging frame, and charging frame is submerged in magnesium melt into melting to pure
Bismuth ingot melts completely, obtains mixed liquor；
S14 refining removal of impurities：Refining agent of Mg alloy is added in mixed liquor into S13 steps and is stirred refining, is incubated, will be molten
The scum silica frost on liquid surface is cleaned out, and obtains alloy molten solution；
S15 ingot blanks are cast：Alloy molten solution in S14 steps is poured into preheated metal casting mould or sand mold casting
Ingot blank is frozen into modeling tool；Or alloy molten solution is transported in crystallizer, continuously or semi-continuously it is cast as ingot blank；
S2 prepares intermediate alloy：By surface of ingot blank car light, then ingot blank diameter is carried out and the processing of length obtains blank, by base
Extruding obtains intermediate alloy after material heats in extruder；
S3 alloy meltings：
S31 magnesium alloy smeltings：Fusion crucible AM50B magnesium alloys or AM60B magnesium alloys being put into magnesium alloy melting furnace
Middle fusing, obtain magnesium alloy solution；
S32 cast magnesium alloy structural members：The magnesium that the intermediate alloy wire rod or bar of the pre-heat treatment are added in S31 steps closes
In gold solution, impact-resisting and heat resistant magnesium alloy structural part is cast into.
In the preparation technology of magnesium alloy structural part, first carry out preparing intermediate alloy billet, preparing intermediate alloy billet
During, technique is simple, and the intermediate alloy billet quality being prepared is good, and shock resistance and heat resistance are good；Making
During standby structural member, first by the raw material melting of magnesium alloy layer, then the casting of magnesium alloy layer melting hydraulic pressure is enterprising in intermediate alloy
Row shaping prepares magnesium alloy structural part, and the extrusion process of magnesium alloy structural part is close with the extrusion process of magnesium alloy layer raw material, pressure
Yield strength, the creep strength for casting obtained magnesium alloy structural part increase substantially, the magnesium alloy structural part being prepared
Shock resistance and fine heat-resisting performance.
Further, the temperature melted in the S12 steps is 680~830 DEG C；The temperature of melting in the S13 steps
For 700~830 DEG C；The temperature being incubated in the S14 steps is 720~800 DEG C, and the time of insulation is 10~60min.
Further, the pre-heat treatment of pure magnesium ingot is in the S12 steps：100~600 DEG C are preheated in preheating furnace；Institute
The pre-heat treatment for stating pure bismuth ingot in S13 steps is：100~200 DEG C are preheated in preheating furnace；The intermediate alloy of the S32 steps
The pre-heat treatment be：200~300 DEG C are preheated in preheating furnace.
Further, blank diameter is smaller 3~6mm than internal diameter of the container in the S2 steps, and charge length is blank diameter
1.5~2.5 times；Heating-up temperature is 420~530 DEG C in the S2 steps, and the heat time is 6~36h；Squeezed in the S2 steps
Recipient temperature is 350~490 DEG C in press, and pressure ram pace is 0.1~5mm/s in extruder.
Further, a diameter of 10~60mm of the intermediate alloy.
Pure magnesium ingot and pure bismuth ingot are first subjected to the pre-heat treatment, the temperature of the pre-heat treatment in the preparation process of intermediate alloy billet
Degree differs, and during alloy melting is carried out, also carries out the preheating of intermediate alloy, Structure of magnesium alloy is more conducive to after preheating
The die casting of part, the wire rod or performance test prepared in the press casting procedure of intermediate alloy are more excellent.
The beneficial effects of the invention are as follows：
1. two kinds of differences are used for magnesium alloy in preparing a kind of magnesium alloy structural part, the bismuth-containing amount of intermediate alloy is higher, shock resistance
Performance, heat resistance and processing characteristics are excellent；Magnesium alloy layer use AM50B magnesium alloys or AM60B magnesium alloys cost compared with
Low, it is less to add the amount of intermediate alloy, and cost increase is less, suitable for industrialized production；The extrusion process of magnesium alloy structural part
Change is smaller, and extrusion process performance is substantially suitable with AM50B magnesium alloys or AM60B magnesium alloys, meets extrusion process requirement；
120 DEG C~170 DEG C of yield strength, creep-resistant property increase substantially；Produced under 150 DEG C, long-time load effect in 100 hours
Creep strength during 0.1% deformation of creep, by AM50B or AM60B 7~9MPa, 25~35MPa is brought up to, can met
Application of the magnesium alloy on the important components such as automatic transmission casing, high-power engine oil sump；
2. using intermediate alloy as wire rod or bar in magnesium alloy structural part, the bi content of intermediate alloy is higher, can be larger
Lifting magnesium alloy shock resistance and heat resistance, the overall bi content of structural member after magnesium alloy structural part is made as
Relatively low, cost is relatively low；
3. in the preparation technology of magnesium alloy structural part, first carry out preparing intermediate alloy billet, preparing intermediate alloy base
During ingot, technique is simple, and the intermediate alloy billet quality being prepared is good, and shock resistance and heat resistance are good；
During preparation structure part, first by the raw material melting of magnesium alloy layer, then by the casting of magnesium alloy layer melting hydraulic pressure on intermediate alloy
Carrying out shaping and prepare magnesium alloy structural part, the extrusion process of magnesium alloy structural part is close with the extrusion process of magnesium alloy layer raw material,
Yield strength, the creep strength for the magnesium alloy structural part that die casting obtains increase substantially, the magnesium alloy structural part being prepared
Shock resistance and fine heat-resisting performance；
4. pure magnesium ingot and pure bismuth ingot are first subjected to the pre-heat treatment in the preparation process of intermediate alloy billet, the pre-heat treatment
Temperature differs, and during alloy melting is carried out, also carries out the preheating of intermediate alloy, magnesium alloy knot is more conducive to after preheating
The die casting of component, the wire rod or performance test prepared in the press casting procedure of intermediate alloy are more excellent.
Brief description of the drawings
Fig. 1 is process chart；
Fig. 2 is square magnesium alloy structural part；
Fig. 3 is circular magnesium alloy structural part；
In figure：
1- intermediate alloys；
2- magnesium alloy layers.
Embodiment
Technical scheme is described in further detail with reference to specific embodiment, but protection scope of the present invention is not
It is confined to as described below.
A kind of impact-resisting and heat resistant magnesium alloy structural part, it is characterised in that be followed successively by intermediate alloy 1 and magnesium alloy from inside to outside
Layer 2；
The intermediate alloy 1 is magnesium-bismuth intermediate alloy；
The magnesium alloy layer 2 is AM50B magnesium alloys or AM60B magnesium alloys.
Specifically, the intermediate alloy 1 is wire rod or bar.
Specifically, the weight ratio of the magnesium-bismuth intermediate alloy is as follows：
Bismuth 20~70%；
Its surplus is magnesium.
Specifically, the weight ratio of bismuth element is 0.50~5.0% in the magnesium alloy structural part.
The design parameter of magnesium alloy structural part is as shown in table 1 in 1~embodiment of embodiment 8, and 1~embodiment of embodiment 4 is
The technical scheme that technical parameter limits in the present invention, bi content is relatively low in embodiment 5 and makes adaptation adjustment, bismuth in embodiment 6
Content is higher and makes adaptation adjustment, is AM50B magnesium alloys in embodiment 7, and embodiment 8 is AM60B magnesium alloys, and embodiment 5- is real
It is check experiment group to apply example 8.
Table 1
The preparation method of impact-resisting and heat resistant magnesium alloy structural part, comprises the following steps：
S1 founding intermediate alloy billets：
S11 raw materials prepare：Pure magnesium ingot and pure bismuth ingot are stocked up according to percentage by weight；
S12 melting magnesium ingots：The pure magnesium ingot of the pre-heat treatment of 1/2~1/20 weight is added in the fusion crucible of melting furnace,
The pure magnesium ingot of remaining the pre-heat treatment is added in fusion crucible in batches, cleared up the scum silica frost of molten surface after melting
Totally, magnesium melt is obtained；
S13 melting bismuth ingots：The pure bismuth ingot of the pre-heat treatment is put into charging frame, and charging frame is submerged in magnesium melt into melting to pure
Bismuth ingot melts completely, obtains mixed liquor；
S14 refining removal of impurities：Refining agent of Mg alloy is added in mixed liquor into S13 steps and is stirred refining, is incubated, will be molten
The scum silica frost on liquid surface is cleaned out, and obtains alloy molten solution；
S15 ingot blanks are cast：Alloy molten solution in S14 steps is poured into preheated metal casting mould or sand mold casting
Ingot blank is frozen into modeling tool；Or alloy molten solution is transported in crystallizer, continuously or semi-continuously it is cast as ingot blank；
S2 prepares intermediate alloy 1：By surface of ingot blank car light, then carry out ingot blank diameter and the processing of length obtains blank, will
Extruding obtains intermediate alloy 1 after blank heats in extruder；
S3 alloy meltings：
S31 magnesium alloy smeltings：Fusion crucible AM50B magnesium alloys or AM60B magnesium alloys being put into magnesium alloy melting furnace
Middle fusing, obtain magnesium alloy solution；
S32 cast magnesium alloy structural members：The magnesium that the intermediate alloy wire rod or bar of the pre-heat treatment are added in S31 steps closes
In gold solution, impact-resisting and heat resistant magnesium alloy structural part is cast into.
Specifically, the temperature melted in the S12 steps is 680~830 DEG C；The temperature of melting is in the S13 steps
700~830 DEG C；The temperature being incubated in the S14 steps is 720~800 DEG C, and the time of insulation is 10~60min.
Specifically, the pre-heat treatment of pure magnesium ingot is in the S12 steps：100~600 DEG C are preheated in preheating furnace；It is described
The pre-heat treatment of pure bismuth ingot is in S13 steps：100~200 DEG C are preheated in preheating furnace；The intermediate alloy 1 of the S32 steps
The pre-heat treatment is：200~300 DEG C are preheated in preheating furnace.
Specifically, blank diameter is smaller 3~6mm than internal diameter of the container in the S2 steps, and charge length is blank diameter
1.5~2.5 times；Heating-up temperature is 420~530 DEG C in the S2 steps, and the heat time is 6~36h；Extruded in the S2 steps
Recipient temperature is 350~490 DEG C in machine, and pressure ram pace is 0.1~5mm/s in extruder.
Specifically, a diameter of 10~60mm of the intermediate alloy 1.
Design parameter in 1~embodiment of embodiment 8 in magnesium alloy structural part preparation process is as shown in table 2, and embodiment 1~
The technical scheme that embodiment 4 limits for technical parameter in the present invention, bi content is relatively low in embodiment 5 and makes adaptation adjustment, real
It is higher and make adaptation adjustment to apply bi content in example 6, is AM50B magnesium alloys in embodiment 7, embodiment 8 is AM60B magnesium alloys,
Embodiment 5- embodiments 8 are check experiment group.
Table 2
The performance parameter of magnesium alloy structural part is as shown in table 3 in 1~embodiment of embodiment 8, and 1~embodiment of embodiment 4 is
The technical scheme that technical parameter limits in the present invention, bi content is relatively low in embodiment 5 and makes adaptation adjustment, bismuth in embodiment 6
Content is higher and makes adaptation adjustment, is AM50B magnesium alloys in embodiment 7, and embodiment 8 is AM60B magnesium alloys, and embodiment 5- is real
It is check experiment group to apply example 8.
Table 3
It can be obtained from the data of table 3, the creep strength of 1~embodiment of embodiment 4 is much larger than embodiment 5~implementation
Example 8, i.e. experimental group are far above control group, and the magnesium alloy structural part that 1~embodiment of embodiment 4 is prepared can be used for 1.6
~2.4 liter capacity car automatic gear-box, motorcycle crankcase and automobile gear chamber cap etc..
Described above is only the preferred embodiment of the present invention, it should be understood that the present invention is not limited to described herein
Form, the exclusion to other embodiment is not to be taken as, and can be used for various other combinations, modification and environment, and can be at this
In the text contemplated scope, it is modified by the technology or knowledge of above-mentioned teaching or association area.And those skilled in the art are entered
Capable change and change does not depart from the spirit and scope of the present invention, then all should be in the protection domain of appended claims of the present invention
It is interior.
Claims (9)
1. a kind of impact-resisting and heat resistant magnesium alloy structural part, it is characterised in that be followed successively by intermediate alloy (1) and magnesium alloy from inside to outside
Layer (2)；
The intermediate alloy (1) is magnesium-bismuth intermediate alloy；
The magnesium alloy layer (2) is AM50B magnesium alloys or AM60B magnesium alloys.
A kind of 2. impact-resisting and heat resistant magnesium alloy structural part according to claim 1, it is characterised in that the intermediate alloy
(1) it is wire rod or bar.
3. a kind of impact-resisting and heat resistant magnesium alloy structural part according to claim 1, it is characterised in that among the magnesium-bismuth
The weight ratio of alloy is as follows：
Bismuth 20~70%；
Its surplus is magnesium.
A kind of 4. impact-resisting and heat resistant magnesium alloy structural part according to claim 1, it is characterised in that the Structure of magnesium alloy
The weight ratio of bismuth element is 0.50~5.0% in part.
5. the preparation method of the impact-resisting and heat resistant magnesium alloy structural part described in any one of Claims 1 to 4, it is characterised in that bag
Include following steps：
S1 founding intermediate alloy billets：
S11 raw materials prepare：Pure magnesium ingot and pure bismuth ingot are stocked up according to percentage by weight；
S12 melting magnesium ingots：The pure magnesium ingot of the pre-heat treatment of 1/2~1/20 weight is added in the fusion crucible of melting furnace, by it
The pure magnesium ingot of remaining the pre-heat treatment is added in fusion crucible in batches, is cleared up the scum silica frost of molten surface after melting and is done
Only, magnesium melt is obtained；
S13 melting bismuth ingots：The pure bismuth ingot of the pre-heat treatment is put into charging frame, and charging frame is submerged in magnesium melt into melting to pure bismuth ingot
Melt completely, obtain mixed liquor；
S14 refining removal of impurities：Refining agent of Mg alloy is added in mixed liquor into S13 steps and is stirred refining, is incubated, by solution table
The scum silica frost in face is cleaned out, and obtains alloy molten solution；
S15 ingot blanks are cast：Alloy molten solution in S14 steps is poured into preheated metal casting mould or sand casting mould
Ingot blank is frozen into tool；Or alloy molten solution is transported in crystallizer, continuously or semi-continuously it is cast as ingot blank；
S2 prepares intermediate alloy (1)：By surface of ingot blank car light, then ingot blank diameter is carried out and the processing of length obtains blank, by base
Extruding obtains intermediate alloy (1) after material heats in extruder；
S3 alloy meltings：
S31 magnesium alloy smeltings：AM50B magnesium alloys or AM60B magnesium alloys are put into the fusion crucible in magnesium alloy melting furnace and melted
Change, obtain magnesium alloy solution；
S32 cast magnesium alloy structural members：The magnesium alloy that the intermediate alloy wire rod or bar of the pre-heat treatment are added in S31 steps is molten
In liquid, impact-resisting and heat resistant magnesium alloy structural part is cast into.
6. the preparation method of impact-resisting and heat resistant magnesium alloy structural part according to claim 5, it is characterised in that the S12
The temperature melted in step is 680~830 DEG C；The temperature of melting is 700~830 DEG C in the S13 steps；The S14 steps
The temperature of middle insulation is 720~800 DEG C, and the time of insulation is 10~60min.
7. the preparation method of impact-resisting and heat resistant magnesium alloy structural part according to claim 5, it is characterised in that the S12
The pre-heat treatment of pure magnesium ingot is in step：100~600 DEG C are preheated in preheating furnace；In the S13 steps at the preheating of pure bismuth ingot
Manage and be：100~200 DEG C are preheated in preheating furnace；The pre-heat treatment of the intermediate alloy (1) of the S32 steps is：It is pre- in preheating furnace
Heat is to 200~300 DEG C.
8. the preparation method of impact-resisting and heat resistant magnesium alloy structural part according to claim 5, it is characterised in that the S2 steps
Blank diameter is smaller 3~6mm than internal diameter of the container in rapid, and charge length is 1.5~2.5 times of blank diameter；In the S2 steps
Heating-up temperature is 420~530 DEG C, and the heat time is 6~36h；In the S2 steps in extruder recipient temperature be 350~
490 DEG C, pressure ram pace is 0.1~5mm/s in extruder.
9. the preparation method of the impact-resisting and heat resistant magnesium alloy structural part according to claim 5 or 8, it is characterised in that described
A diameter of 10~60mm of intermediate alloy (1).
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101173330A (en) * | 2006-10-31 | 2008-05-07 | 北京有色金属研究总院 | Low cost heat resisting magnesium alloy and method for producing the same |
| CN103215481A (en) * | 2013-04-17 | 2013-07-24 | 广州有色金属研究院 | Middle-toughness rare earth heat-resisting magnesium alloy |
| CN104148399A (en) * | 2014-06-16 | 2014-11-19 | 枣庄瑞兴机械制造有限公司 | Wear-resisting roll used for steel rolling intermediate mill frame and manufacturing method thereof |
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2017
- 2017-10-18 CN CN201710971550.1A patent/CN107737906A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101173330A (en) * | 2006-10-31 | 2008-05-07 | 北京有色金属研究总院 | Low cost heat resisting magnesium alloy and method for producing the same |
| CN103215481A (en) * | 2013-04-17 | 2013-07-24 | 广州有色金属研究院 | Middle-toughness rare earth heat-resisting magnesium alloy |
| CN104148399A (en) * | 2014-06-16 | 2014-11-19 | 枣庄瑞兴机械制造有限公司 | Wear-resisting roll used for steel rolling intermediate mill frame and manufacturing method thereof |
Non-Patent Citations (1)
| Title |
|---|
| 袁广银等: "Mg-Al基合金加铋合金化对其力学性能的改善作用", 《东南大学学报》 * |
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