CN100406161C - Oriented freezing cast method - Google Patents

Oriented freezing cast method Download PDF

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Publication number
CN100406161C
CN100406161C CNB2005100463428A CN200510046342A CN100406161C CN 100406161 C CN100406161 C CN 100406161C CN B2005100463428 A CNB2005100463428 A CN B2005100463428A CN 200510046342 A CN200510046342 A CN 200510046342A CN 100406161 C CN100406161 C CN 100406161C
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CN
China
Prior art keywords
directional solidification
mold
casting
crystallizer
holding furnace
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Expired - Fee Related
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CNB2005100463428A
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Chinese (zh)
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CN1853827A (en
Inventor
张健
燕冰川
楼琅洪
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Institute of Metal Research of CAS
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Institute of Metal Research of CAS
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Application granted granted Critical
Publication of CN100406161C publication Critical patent/CN100406161C/en
Expired - Fee Related legal-status Critical Current
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Abstract

The present invention provides a novel directional solidification casting method, namely that a melted alloy is cast in a mold which is preheated in a holding furnace, wherein the mold is placed on a crystallizer and is pulled gradually from the holding furnace at a certain speed. The present invention is characterized in that the mold which is placed on the crystallizer is pulled into a low-melting point liquid metal molten pool at a certain speed. The novel directional solidification casting method which is provided by the present invention has the following advantages: ideal large size directional solidification and monocrystal material can be obtained through an optimized technical parameter; compared with a traditional directional solidification technique which uses a water-cooling crystallizer, the production efficiency is enhanced obviously, the macrostructure of the material is even in the whole range of length, and the microstructure segregation is small.

Description

A kind of directional solidification casting method
Technical field
The present invention relates to directional solidification technique, specifically is a kind of liquid metal cooling directional solidification casting technology.
Background technology
Directional solidification technique can be produced the metal casting of eliminating horizontal crystal boundary (directional columnargrain) or eliminating crystal boundary (monocrystalline) fully, and the foundry goods that obtains with the conventional cast method compares, and these foundry goods have better vertically mechanical performance.The quiet moving vane of gas turbine, aero-engine is exactly the example that directional solidification technique is used.
Industrialized directional solidification technique mainly is meant high speed freezing method (HRS), as shown in Figure 3, formwork 3 is placed on the water mold 6, and in holding furnace 2, be heated to more than the fusing point of metal by heating original paper 1, after the melt metal of in formwork, casting, formwork is left behind along the direction of arrow from holding furnace, forms directional solidification castings.A crucial decisive factor of directional solidification castings quality is the thermograde that apparatus for directional solidification can reach in whole directional solidification process, if whole foundry goods directional solidification under higher thermograde, production efficiency is just higher, and the qualification rate of product is also higher.For strengthening thermograde, some HRS equipment have used thermal baffle 4 in the holding furnace bottom, under thermal baffle, used water-cooling ring 5, the heat of formwork is scattered and disappeared to water mold by the heat conduction on the one hand, scattered and disappeared to water-cooling ring by heat radiation on the other hand.
For obtaining the alloy of fusion, general apparatus for directional solidification all adopts induction heating method, and as shown in Figure 3, the high temperature alloy foundry alloy is placed in the crucible 11, after induction coil 12 heat fused, pours into by running channel 13 in the formwork of holding furnace.
Traditional HRS equipment since thermal baffle can't change with the foundry goods change of shape, inevitably can leaving gap between formwork 3 and thermal baffle 4, this can reduce the thermograde of directional solidification process greatly; Equally, the cooling effect of water-cooling ring also is subjected to the influence of foundry goods shape; In addition, water mold 6 moves down in the directional solidification process, gradually away from holding furnace, fewer and feweri by the heat that the heat conduction of water mold is taken away, generally when the casting mold height surpasses 7cm, the heat of formwork mainly relies on to the radiation of vacuum-chamber wall 7 and takes away, and therefore with the increase of casting length, the thermograde that HRS equipment can reach progressively reduces.Fig. 4 is the relation of setting rate in the directional solidification (being substantially equal to the draw speed of water mold), thermograde and casting dimension.Equiax crystal among the figure, shrinkage cavity, spot, low-angle boundary etc. all are defectives common in orientation and the single crystal casting, when obviously the HRS method is produced big blade, because the thermograde that equipment can reach is very little, can only adopt very low setting rate (draw speed) in the production, production efficiency is extremely low on the one hand, near the limit (grey area elliptica among the figure) of process conditions, foundry goods is easy to produce defective on the other hand, and product percent of pass is very low.So the HRS method is when production large scale orientation and single crystal casting, cost is high.
Summary of the invention
The object of the invention provides a kind of directional solidification casting method, specifically is a kind of liquid metal cooling directional solidification casting method, makes the thermograde of foundry goods higher and draw speed is bigger.
The invention provides a kind of directional solidification casting method, the DZ125L alloy that is about to fusing is cast in the casting mold of preheating in holding furnace, casting mold is placed on the crystallizer, casting mold is pulled out holding furnace gradually with certain speed, it is characterized in that: the described casting mold that is placed on the crystallizer is drawn in the low melting point liquid metal molten bath with certain speed.
In the directional solidification casting method provided by the invention, its low melting point liquid metal molten bath can be the Sn molten bath, and the temperature of Sn liquid is 232~380 ℃.
In the directional solidification casting method provided by the invention, dynamic thermal insulation layer can be used in its Sn liquid surface, dynamically the material of thermal insulation layer be high temperature resistant, the coefficient of heat conduction is low, density is lower than LIQUID Sn, high temperature is not down with mold material reacts, and the nonwettable material of Sn.
In the directional solidification casting method provided by the invention, the material of its dynamic thermal insulation layer can be Al 2O 3, SiO 2, SiC or MgAl 2O 4Deng.
Directional solidification casting method provided by the invention, the thickness of its dynamic thermal insulation layer can be 0.1~10cm.
In the directional solidification casting method provided by the invention, when alloy cast temperature during at 1450~1800 ℃, casting mold holding furnace temperature is 1450-1800 ℃, and draw speed is at 1mm/min~25mm/min.
Directional solidification casting method provided by the invention has following advantage: can obtain desirable large scale directional solidification and monocrystal material by optimized parameters, use the water mold directional solidification processes relatively with tradition, production efficiency significantly improves, evenly, the microstructure segregation is little in whole length range in the macrostructure of material.
Description of drawings
Fig. 1 is for adopting directional solidification 25 * 8 * 2cm foundry goods of the present invention, the foundry goods top crystallographic orientation tissue that obtains;
Fig. 2 is the identical foundry goods of traditional water cooling crystallizer technology, the crystallographic orientation tissue that same area obtains;
Fig. 3 prepares the directional solidification castings schematic diagram for traditional HRS technology;
Fig. 4 is that thermograde in the directional solidification processes, draw speed and directional solidification castings size, defective concern schematic diagram.
The specific embodiment
The tabular foundry goods of embodiment 1 DZ125L directionally solidified alloy preparation 20 * 80 * 250mm.
Casting mold is placed on the stainless steel chassis of tensioning system in advance, and the latter half on stainless steel chassis immerses in the Sn liquid of fusion, 235 ℃ of Sn liquid temps.Use AlMg 2O 4As dynamic insulating layer material, dynamic thermal insulation layer thickness 2cm.
Mould shell temperature remains on 1450 ℃, after the fusing of DZ125L alloy pig, pours in the tabular casting mold, leaves standstill (1500 ℃ of cast temperatures) 1 minute.Casting mold is drawn in downwards in the Sn liquid with the speed of 17mm/min with the stainless steel chassis, realizes directional solidification.

Claims (2)

1. oriented freezing cast method, the alloy that is about to fusing is cast in the casting mold of preheating in holding furnace, casting mold is placed on the crystallizer, casting mold is pulled out holding furnace gradually with certain speed, it is characterized in that: the described casting mold that is placed on the crystallizer is drawn in the low melting point liquid metal molten bath gradually with the speed of 1mm/min~25mm/min---and temperature is 232~380 ℃ a Sn liquid, dynamic thermal insulation layer is used on Sn liquid surface, dynamically the material of thermal insulation layer is high temperature resistant, the coefficient of heat conduction is low, density is lower than LIQUID Sn, high temperature descends and mold material does not react, with the nonwettable material of Sn, Al 2O 3, SiO 2, SiC or MgAl 2O 3
2. according to the described oriented freezing cast method of claim 1, it is characterized in that: the thickness of described dynamic thermal insulation layer is 0.1~10cm.
CNB2005100463428A 2005-04-29 2005-04-29 Oriented freezing cast method Expired - Fee Related CN100406161C (en)

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Application Number Priority Date Filing Date Title
CNB2005100463428A CN100406161C (en) 2005-04-29 2005-04-29 Oriented freezing cast method

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Application Number Priority Date Filing Date Title
CNB2005100463428A CN100406161C (en) 2005-04-29 2005-04-29 Oriented freezing cast method

Publications (2)

Publication Number Publication Date
CN1853827A CN1853827A (en) 2006-11-01
CN100406161C true CN100406161C (en) 2008-07-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI718785B (en) * 2019-11-28 2021-02-11 財團法人金屬工業研究發展中心 Method for manufacturing a mold

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102069176B (en) * 2009-11-25 2012-10-03 中国科学院金属研究所 Liquid metal cooling directional solidification process
CN105964991B (en) * 2016-05-23 2018-02-06 西北工业大学 The directional freeze method of freckle in casting can be eliminated
CN111496199A (en) * 2019-01-30 2020-08-07 上海交通大学 Device for increasing cooling speed of cast ingot and application method thereof

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1117899A (en) * 1994-08-31 1996-03-06 李忠炎 Continuous directional solidification precision casting technology for large tube-like thin-wall component and equipment thereof
CN2266604Y (en) * 1995-11-07 1997-11-05 西北工业大学十七系 Electromagnetic driving liquid quenching directional solidification crystallizer
CN1169124A (en) * 1994-08-08 1997-12-31 西门子公司 Method and device for directionally solidifying a melt liquid
CN1226291A (en) * 1996-06-05 1999-08-18 通用电气公司 Method and apparatus for making directional solidification castings
CN1539572A (en) * 2003-10-24 2004-10-27 周照耀 Method and equipment for successive co-orientation solidification casting and manufactured wire rod or plate and belt material

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1169124A (en) * 1994-08-08 1997-12-31 西门子公司 Method and device for directionally solidifying a melt liquid
CN1117899A (en) * 1994-08-31 1996-03-06 李忠炎 Continuous directional solidification precision casting technology for large tube-like thin-wall component and equipment thereof
CN2266604Y (en) * 1995-11-07 1997-11-05 西北工业大学十七系 Electromagnetic driving liquid quenching directional solidification crystallizer
CN1226291A (en) * 1996-06-05 1999-08-18 通用电气公司 Method and apparatus for making directional solidification castings
CN1539572A (en) * 2003-10-24 2004-10-27 周照耀 Method and equipment for successive co-orientation solidification casting and manufactured wire rod or plate and belt material

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI718785B (en) * 2019-11-28 2021-02-11 財團法人金屬工業研究發展中心 Method for manufacturing a mold

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