CN101914713B - Oversized high-strength heatproof magnesium alloy ingot blank semicontinuous casting technique - Google Patents

Oversized high-strength heatproof magnesium alloy ingot blank semicontinuous casting technique Download PDF

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CN101914713B
CN101914713B CN2010102197035A CN201010219703A CN101914713B CN 101914713 B CN101914713 B CN 101914713B CN 2010102197035 A CN2010102197035 A CN 2010102197035A CN 201010219703 A CN201010219703 A CN 201010219703A CN 101914713 B CN101914713 B CN 101914713B
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ingot
magnesium alloy
oversized
temperature
ingot blank
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CN2010102197035A
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CN101914713A (en
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刘楚明
舒心
李慧中
高永浩
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中南大学
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Abstract

The invention relates to an oversized high-strength heatproof magnesium alloy ingot blank semicontinuous casting technique. The alloy comprises the following components by weight percent: 6-13% of Gd, 2-6% of Y, 0.3-0.8% of Zr and the balance of Mg and irremovable impurity elements. The technique comprises the steps of melting magnesium ingots, adding solvents, adding alloy elements, refining, degassing, removing impurities, preserving heat and standing, and semicontinuously casting under the low casting speed by using a counter-pressure gas fluid-guiding method at low temperature and under low cooling speed. In the invention, technique parameters such as the casting temperature, the cooling speed, the ingot pulling speed, the inner liquid level height of a crystallizer, and the like are controlled to obtain the oversized high-strength magnesium alloy ingot blank with flat and smooth surface, refining and uniform tissue and no solute segregation, and the diameter of the ingot blank is from 220 mm to 505 mm. The length of the ingot is 1000-5000 mm. The invention meets the requirements for the oversized ingot blank required by high-strength heatproof magnesium alloy materials in the fields of aerospace, information electronics, communications and transportation, and the like.

Description

Oversized high-strength heatproof magnesium alloy ingot blank semicontinuous casting technique

Technical field

The present invention relates to the casting field of magnesiumalloy, particularly a kind of super large-scale novel high-strength heatproof magnesium alloy ingot blank semicontinuous casting technique.

Background technology

Magnesiumalloy is a lightest present available metal structured material, has high specific tenacity and specific rigidity, good diamagnetism, high electronegativity and thermal conductivity, and has good damping property and machinability.Along with the demand of industry such as Aeronautics and Astronautics, information electronics, communications and transportation to the high-strength light material rolls up, the Application of Magnesium scope is more and more wider.

Magnesium alloy smelting and casting technique directly produce material impact to magnesium alloy ingot blank, and the quality of its ingot blank quality has important hereditation again to post forming processing and performance.Traditional semi-continuous casting method can only be cast the ordinary magnesium alloy ingot blank; And its inside of the super-large diameter ingot blank that casts out (diameter 305-450mm) often has more inclusion, and occur easily that crystal grain is thick, defective such as tissue looseness, surface or heart check, seriously reduce performance of products after the following process; Its ingot blank is after following process is handled; Room temperature strength all is lower than 400MPa, and under 300 ℃, its intensity all is lower than 200MPa; In magnesiumalloy, add more REE; Can significantly improve its room-temperature mechanical property (intensity is greater than 450MPa) and mechanical behavior under high temperature (under 300 ℃; Intensity is all greater than 200MPa) and corrosion resistance nature (salt-fog test prolongs a times than AZ31, MB8); But a large amount of addings of REE increase the congealed solid shrinkage of alloy, and foundryman's fever stress sharply increases, and cause more being easy to generate various casting flaws than the ordinary magnesium alloy casting in the semicontinuous casting process; Particularly be easy to generate the through wall flaw that connects ingot blank, bigger for its ingot casting difficulty of super large-scale ingot casting.

Therefore, improve existing ordinary magnesium alloy semicontinuous casting technique, optimize each key parameter in melting, the castingprocesses, casting out super large-scale (diameter is greater than 300mm) high-strength magnesium alloy ingot blank (tensile strength >=450MPa) particularly important.

Summary of the invention

The object of the invention is to provide the semicontinuous casting technique of a kind of super large-scale (diameter of phi 220-505mm, ingot casting length 1000-5000mm) high-strength magnesium alloy ingot blank.Through the control melting technology, regulation and control teeming temperature, speed of cooling and draw in the ingot speed, mold key process parameters such as liquid level to obtain surperficial flawless; Defectives such as inner no shrinkage porosite, cold shut; Surfacing is bright and clean, structure refinement and evenly, the oversized high-strength degree magnesiumalloy high-quality ingot casting of no solute segregation, its ingot casting through process and thermal treatment after, under the room temperature condition; Tensile strength >=450MPa, elongation >=3%; In the time of 250 ℃, tensile strength >=330MPa, elongation >=12%; In the time of 300 ℃, tensile strength >=250MPa, elongation >=21%; In the time of 350 ℃, intensity >=100MPa, elongation >=48%.

High-strength magnesium alloy of the present invention, form (mass percent) by following component:

Gd:6-13%, Y:2-6%, Zr:0.3-0.8%, Cu≤0.001%, Ni≤0.001%, Fe≤0.015%, Si≤0.01%, Mn≤0.005%, impurity≤0.10%, Mg: surplus.

The semicontinuous casting technique of oversized high-strength magnesium alloy ingot blank of the present invention may further comprise the steps:

A, fusing magnesium, with high pure magnesium ingot fusing, temperature of fusion is 680 ℃~750 ℃, adds 5# flux simultaneously in iron crucible;

B, after magnesium ingot melts fully, add Mg-Gd, Mg-Y, Mg-Zr master alloy successively, temperature is 750 ℃-820 ℃, and be sprinkled in right amount 5# flux with the protection melt;

C, after alloy melts fully, stir, skim after adopting the argon gas degasification;

D, temperature are reduced to 680 ℃-730 ℃, and 30min~2h is left standstill in insulation;

Copper mold ingot casting is adopted in e, casting on semicontinuous caster; Magnesiumalloy liquid is introduced the shunting disk place cover heart portion in the mold, and in the inner metal sleeve that is got into mold by shunting disk shunting back and the space that dummy ingot is formed, it is that molten metal provides gas shield that compression ring is protected in unlatching simultaneously;

680 ℃-710 ℃ of teeming temperatures are drawn ingot speed 30-60mm/min, liquid level 30-50mm in the crystallization control device, and cooling water pressure 0.01-0.08MPa, the secondary cooling water temperature is 40-50 ℃.

The present invention successfully casts out the ultra-large type high-strength magnesium alloy ingot casting of two kinds of specifications through each key process parameter in regulation and control melting, the castingprocesses.Below in conjunction with accompanying drawing and embodiment the present invention is further specified.These embodiment are used to explain the present invention, rather than limitation of the present invention, conceive under the prerequisite in the present invention technology of the present invention is improved, and all belong to the scope of requirement protection of the present invention.

Description of drawings

Fig. 1 is the high-strength heat-resistant magnesium alloy ingot blank of Φ 305mm for the diameter that the present invention produces;

Fig. 2 is the high-strength heat-resistant magnesium alloy ingot blank of Φ 305 * 3500mm for the diameter that the present invention produces;

Fig. 3 is the high-strength heat-resistant magnesium alloy ingot blank diameter of Φ 405mm for the diameter that the present invention produces;

Φ 405 * 1200mm high-strength heat-resistant magnesium alloy ingot blank that the diameter that Fig. 4 produces for the present invention is.

Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed description.

Embodiment

Embodiment 1:

Present embodiment is through regulating each processing parameter of D.C.casting, to obtain high quality oversized high-strength magnesium alloy ingot.Magnesium alloy fused mass adopts the low pressure metaideophone technology and the flow control technique of melt after refining, leaving standstill, realize the micro-controlled of casting process alloy flow quantity.Concrete process step is following:

A, fusing magnesium, with high pure magnesium ingot fusing, temperature of fusion is 720 ℃, adds 5# flux simultaneously in iron crucible;

B, after magnesium ingot melts fully, add Mg-Gd, Mg-Y, Mg-Zr master alloy successively, temperature is 790 ℃, and be sprinkled in right amount 5# flux with the protection melt;

C, after alloy melts fully, stir, skim after adopting the argon gas degasification;

D, temperature are reduced to 700 ℃, and 1h30min is left standstill in insulation;

Copper mold ingot casting is adopted in e, casting on semicontinuous caster; Magnesiumalloy liquid is introduced the shunting disk place cover heart portion in the mold, and in the inner metal sleeve that is got into mold by shunting disk shunting back and the space that dummy ingot is formed, it is that molten metal provides gas shield that compression ring is protected in unlatching simultaneously; 700 ℃ of teeming temperatures are drawn ingot speed 45mm/min, liquid level 40mm in the crystallization control device, and cooling water pressure 0.07MPa, the secondary cooling water temperature is 40 ℃.Cast out that the flawless of φ 305mm length 3500mm, no shrinkage porosite, surfacing are bright and clean, structure refinement and evenly, the high-strength magnesium alloy high-quality ingot casting of no solute segregation.

Embodiment 2:

Present embodiment is through regulating each processing parameter of D.C.casting, to obtain high quality oversized high-strength magnesium alloy ingot.Magnesium alloy fused mass adopts the low pressure metaideophone technology and the flow control technique of melt after refining, leaving standstill, realize the micro-controlled of casting process alloy flow quantity.Concrete process step is following:

A, fusing magnesium, with high pure magnesium ingot fusing, temperature of fusion is 720 ℃, adds 5# flux simultaneously in iron crucible;

B, after magnesium ingot melts fully, add Mg-Gd, Mg-Y, Mg-Zr master alloy successively, temperature is 790 ℃, and be sprinkled in right amount 5# flux with the protection melt;

C, after alloy melts fully, stir, skim after adopting the argon gas degasification;

D, temperature are reduced to 700 ℃, and 2h is left standstill in insulation;

Copper mold ingot casting is adopted in e, casting on semicontinuous caster; Magnesiumalloy liquid is introduced the shunting disk place cover heart portion in the mold, and in the inner metal sleeve that is got into mold by shunting disk shunting back and the space that dummy ingot is formed, it is that molten metal provides gas shield that compression ring is protected in unlatching simultaneously; 695 ℃ of teeming temperatures are drawn ingot speed 35mm/min, liquid level 50mm in the crystallization control device, and cooling water pressure 0.07MPa, the secondary cooling water temperature is 45 ℃.Cast out that the flawless of φ 405mm length 1200mm, no shrinkage porosite, surfacing are bright and clean, structure refinement and evenly, the large-scale high-strength magnesium alloy high-quality ingot casting of no solute segregation.

The oversized high-strength heatproof magnesium alloy ingot blank that obtains with above-mentioned castmethod is after extruding and thermal treatment, and its ambient temperature mechanical properties and mechanical behavior under high temperature are as shown in table 1.

Magnesium alloy rod mechanical property under table 1. condition of different temperatures

Claims (2)

1. oversized high-strength heatproof magnesium alloy ingot blank semicontinuous casting technique, the mass percent of each composition of alloy do, Gd:6-13%, and Y:2-6%, Zr:0.3-0.8%, all the other are Mg and the impurity element that can not remove, it is characterized in that may further comprise the steps:
With high pure magnesium ingot fusing, temperature of fusion is 680 ℃~750 ℃, adds 5# flux simultaneously in iron crucible for a, fusing magnesium;
B, after magnesium ingot melts fully, add Mg-Gd, Mg-Y, Mg-Zr master alloy successively, temperature is 750 ℃-820 ℃, and is sprinkled into 5# flux protection melt;
C, after alloy melts fully, stir, skim after adopting the argon gas degasification;
D, temperature are reduced to 680 ℃-730 ℃, and 30min~2h is left standstill in insulation;
E, be cast on the semicontinuous caster and adopt copper mold ingot casting; Liquid magnesium alloy is introduced the shunting disk place cover heart portion in the mold, and in the inner metal sleeve that is got into mold by shunting disk shunting back and the space that dummy ingot is formed, it is that molten metal provides gas shield that compression ring is protected in unlatching simultaneously; 680 ℃-710 ℃ of teeming temperatures are drawn ingot speed 30-60mm/min, liquid level 30-50mm in the crystallization control device, and cooling water pressure 0.01-0.08Mpa, the secondary cooling water temperature is 40-50 ℃.
2. oversized high-strength heatproof magnesium alloy ingot blank semicontinuous casting technique according to claim 1; It is characterized in that: it is 690 ℃-700 ℃ that the e step is cast described teeming temperature; Draw ingot speed 35-45mm/min; Liquid level 40-50mm in the crystallization control device, cooling water pressure 0.06-0.08Mpa.
CN2010102197035A 2010-07-07 2010-07-07 Oversized high-strength heatproof magnesium alloy ingot blank semicontinuous casting technique CN101914713B (en)

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CN103774017B (en) * 2014-01-18 2016-01-13 中南大学 The semicontinuous casting technique of strength heatproof magnesium alloy ingot casting in major diameter
CN103909382B (en) * 2014-01-18 2016-01-20 中南大学 Strength heatproof magnesium alloy thick walled cylinder parts forming technology in a kind of major diameter
CN104384461B (en) * 2014-11-18 2017-05-17 鹤壁万德芙镁科技有限公司 Semi-continuous casting method for high-zinc magnesium-zinc-manganese alloy cast ingot
CN104475694A (en) * 2014-12-07 2015-04-01 金川集团股份有限公司 Method for constantly producing high-pure metal ingots
CN106086563A (en) * 2016-08-05 2016-11-09 沈阳明腾科技有限公司 A kind of high-strength temperature-resistant cast magnesium alloy and preparation method thereof
CN107245619B (en) * 2017-03-03 2018-08-10 中南大学 A kind of strong high temperature resistant magnesium alloy of superelevation
CN107034402B (en) * 2017-03-23 2018-08-07 中南大学 The big ingot blank electromagnetism semicontinuous casting technique of the strong high temperature resistant magnesium alloy of superelevation
CN107034403B (en) * 2017-03-23 2018-12-18 中南大学 The big ingot blank semicontinuous casting technique of VW64M high-strength heat-resistant magnesium alloy
CN108220729A (en) * 2018-02-13 2018-06-29 湖南融拓新材料研究有限公司 A kind of high-strength temperature-resistant cast magnesium alloy and preparation method thereof

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JP3732600B2 (en) * 1996-11-15 2006-01-05 日立金属株式会社 Yttrium-containing magnesium alloy
CN101191168B (en) * 2006-11-23 2011-03-30 北京有色金属研究总院 Magnesium alloy and preparation method thereof
JP2009041066A (en) * 2007-08-08 2009-02-26 Hitachi Metals Ltd Die-cast component of magnesium superior in heat resistance, cast compressor impeller and manufacturing method therefor
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