CN102002618A - Melt overheating treatment method for optimizing magnesium alloy as-cast structure - Google Patents
Melt overheating treatment method for optimizing magnesium alloy as-cast structure Download PDFInfo
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Abstract
The invention discloses a melt overheating treatment method for optimizing a magnesium alloy as-cast structure, comprising the following steps of: firstly heating a magnesium alloy to the melt overheating temperature of 850-950 DEG C for overheating treatment; after the difference of the edge temperature and the core temperature of a melt is less than 2 DEG C, cooling the melt to casting temperature of 720+/-5 DEG C; and then carrying out semi-continuous casting or swage casting to obtain an as-cast sample. Magnesium alloy as-cast dendritic crystal obtained by the method has tiny structure and even component and can obviously improve the deformation performance of the magnesium alloy. Moreover, compared with other processes for thinning the magnesium alloy as-cast structure by adding a thinning agent or adopting a new technique, the melt overheating treatment method has the advantages of low cost and simple process and is easy to operate.
Description
Technical field
The present invention relates to a kind of method of optimizing the magnesium alloy cast tissue, particularly a kind of from refinement as cast condition dendritic structure with improve the melt overheat treatment method that homogeneity of ingredients is optimized the magnesium alloy cast tissue, belong to the magnesium alloy materials technical field.
Background technology
MAGNESIUM METAL and alloy thereof have advantages such as low density, high specific strength and high specific stiffness, good damping shock absorption and thermal conductivity, the wrought magnesium alloys goods have higher intensity than casting magnesium alloy material, better ductility, more diversified mechanical property, can satisfy the needs of more structural parts, but wrought magnesium alloys apply the restriction that is subjected to its viscous deformation poor performance.Wrought magnesium alloys is to be obtained by casting, and alloy as-cast structure in castingprocesses produces component segregation because of nonequilibrium freezing, causes the ununiformity of tissue, causes alloy deformability in the course of processing poor.Studies show that,, can improve the hot-workability of wrought magnesium alloys and the room-temperature mechanical property of goods by the as-cast structure of refinement alloy and the segregation that reduces tissue and composition.
About the more existing reports of the method for refinement magnesium alloy cast tissue.Comprising by in alloy liquid, adding dystectic material, form a large amount of forming core particles, to promote the forming core crystallization of melt, obtain the fine tissue of crystal grain; By adding alloying elements, increase latent heat of solidification, refinement matrix phase reduces the formation of thick phase, utilizes newly-generated the growing up of crystal grain of hindering mutually; Also have research to adopt atomization rapid solidification magnesium alloy, obtaining evenly, tiny equiax crystal and solidification rate reaches 10
2-10
3Ks
-1The double-roller rolling technology, refinement alloy organizing and reduce segregation.In addition, subsequent heat treatment technology by solidified structure such as homogenizing annealing etc. also can reduce the microstructure segregation and the component segregation of alloy casting state tissue, improve its strand hot-forming property and improve the mechanical property of distortion goods.These method costs are higher, and technology is complicated.
Summary of the invention
At the prior art above shortcomings, the object of the present invention is to provide a kind of cost lower, technology is simply optimized the melt overheat treatment method of magnesium alloy cast tissue.
Technical scheme of the present invention is achieved in that a kind of melt overheat treatment method of optimizing the magnesium alloy cast tissue, earlier magnesium alloy is heated to the melt overheat temperature and carries out Overheating Treatment for 850～950 ℃, after melt limit portion's temperature and heart portion temperature head are less than 2 ℃, allow melt be cooled to 720 ± 5 ℃ of teeming temperatures, obtain as-cast specimen by semicontinuous casting or iron mould casting then and get final product.
When solute atoms in the magnesium alloy under the room temperature in theory fully during solid solution, above-mentioned temperature of superheat is 900～950 ℃; When solute atoms in the magnesium alloy under the room temperature in theory fully during solid solution, above-mentioned temperature of superheat is 850～900 ℃.
The magnesium alloy cast dendritic structure that present method obtains is tiny, and composition is even, can significantly improve the deformation performance of magnesium alloy.And than other processing methodes of adding the fining agents or the refinement magnesium alloy cast tissue of employing new technology, it is low to have a cost, the advantage that technology is simple to operation.
Description of drawings
Fig. 1 is a solidified structure under 750 ℃, 800 ℃, 850 ℃, 900 ℃, 950 ℃ in temperature of superheat respectively for the AZ31 magnesium alloy.
Fig. 2 is AZ31, AZ61, the primary dendritic spacing of AZ91 magnesium alloy under different temperature of superheat.
Fig. 3 is AZ31, AZ61, the secondary dendrite arm spacing of AZ91 magnesium alloy under different temperature of superheat.
Fig. 4 is AZ31 magnesium alloy Al, Zn element dendritic segregation degree Se under different temperature of superheat.
Fig. 5 is AZ61 magnesium alloy Al, Zn element dendritic segregation degree Se under different temperature of superheat.
Fig. 6 is AZ91 magnesium alloy Al, Zn element dendritic segregation degree Se under different temperature of superheat.
Embodiment
Melt Overheating Treatment is a kind of basic skills of refinement alloy graining tissue, is that alloy liquid is superheated to temperature certain more than the liquidus temperature, is cooled to teeming temperature again after insulation for some time and pours into a mould.By discovering to iron-based, aluminium base and nickel-base alloy, alloy liquid is superheated to certain temperature, the many short range order atomic radicals that in low-temperature melt, contain, in the hyperthermia and superheating melt, present a kind of state of disarray, this unordered atomic radical carries out reverse transformation in cool down very slow, when solidifying, remain in the solid-state structure easily, thus the as-cast structure of refinement alloy.To the Al-Si alloy, the obvious refinement of Melt Overheating Treatment the size of primary silicon; To studies show that of M963 alloy, Melt Overheating Treatment makes in the as-cast structure nascent MC carbide refinement and is evenly distributed.The research of Melt Overheating Treatment in iron-based, aluminium base and nickel-base alloy, use morely, but still rarely have report at the magnesium alloy fused mass Overheating Treatment.The present invention just is being based on this, proposes to be fit to the melt overheat treatment method of magnesium alloy cast tissue, and finds suitable temperature of superheat and Changing Pattern.
The concrete treatment process of the present invention is, earlier magnesium alloy is heated to the melt overheat temperature and carries out Overheating Treatment for 850～950 ℃, through abundant insulation evenly, record melt limit portion's temperature and heart portion temperature head less than 2 ℃ after, allow melt be cooled to 720 ± 5 ℃ of teeming temperatures, obtain as-cast specimen by semicontinuous casting or iron mould casting then and get final product with heating container.Be lower than at 850 o'clock in temperature of superheat, the degree of Melt Overheating Treatment refined cast structure and raising homogeneity of ingredients is not enough; When temperature of superheat was higher than 950 ℃, further the degree of refined cast structure and raising homogeneity of ingredients was not obvious, may make the as-cast structure alligatoring because of the minimizing of heterogeneous crystallization nuclei on the contrary.
When solute atoms in the magnesium alloy under the room temperature in theory fully during solid solution, above-mentioned temperature of superheat is 900～950 ℃; When solute atoms in the magnesium alloy under the room temperature in theory fully during solid solution, above-mentioned temperature of superheat is 850～900 ℃.
The invention will be further described below by two specific embodiments.
Embodiment one
Select the AZ31 magnesium alloy to carry out Overheating Treatment, in order to obtain to organize optimum melt overheat temperature, having chosen 750 ℃, 800 ℃, 850 ℃, 900 ℃, 950 ℃ five temperature of superheat in the experiment studies, alloy liquid is heated to five temperature of superheat respectively, make melt temperature even through the grace time insulation, record melt limit portion and heart portion temperature head less than after 2 ℃, be cooled to 720 ℃ of teeming temperatures, obtain as-cast specimen by semicontinuous casting with crucible.After as-cast specimen ground with sand paper,, under metaloscope, observe the as-cast structure of alloy with the corrosion of 10% hydrofluoric acid aqueous solution, and the primary dendritic spacing and the secondary dendrite arm spacing of measurement as cast condition dendritic structure; Under scanning electron microscope, by energy spectrum analysis dendritic structure homogeneity of ingredients, by dendritic segregation degree Se tolerance, that is:
C in the formula
MaxBe the maximum concentration of certain constituent element in the dendritic segregation district; C
MinBe the minimum concentration of certain constituent element in the dendritic segregation district; C
θOriginal mean concns for certain constituent element.
In conjunction with Fig. 1, Fig. 2, Fig. 3 and Fig. 4, dendritic structure and primary dendritic spacing, secondary dendrite arm spacing and the dendritic segregation degree Se of AZ31 magnesium alloy under different temperature of superheat are handled, obtain making AZ31 as cast condition dendritic structure the most tiny, the most uniform temperature of superheat of composition is 950 ℃, is the ceiling temperature of 850～950 ℃ of Overheating Treatment temperature.
Embodiment two
By the method for embodiment one, AZ61, AZ91 are experimentized, as shown in Figure 5: make AZ61 magnesium alloy cast dendritic structure the most tiny, the most uniform temperature of superheat of composition is 900 ℃; As shown in Figure 6: make AZ91 magnesium alloy cast dendritic structure the most tiny, the most uniform temperature of superheat of composition is 850 ℃, is the lower limit temperature of 850～950 ℃ of Overheating Treatment temperature.
Hence one can see that, the series alloy identical to alloying element, and when alloying element content is low more, the melt overheat temperature is high more; When alloying element content is high more, the melt overheat temperature is low more.
Claims (2)
1. melt overheat treatment method of optimizing the magnesium alloy cast tissue, it is characterized in that: earlier magnesium alloy is heated to the melt overheat temperature and carries out Overheating Treatment for 850～950 ℃, after melt limit portion's temperature and heart portion temperature head are less than 2 ℃, allow melt be cooled to 720 ± 5 ℃ of teeming temperatures, obtain as-cast specimen by semicontinuous casting or iron mould casting then and get final product.
2. the melt overheat treatment method of optimization magnesium alloy cast tissue according to claim 1 is characterized in that: when solute atoms in the magnesium alloy under the room temperature in theory fully during solid solution, above-mentioned temperature of superheat is 900～950 ℃; When solute atoms in the magnesium alloy under the room temperature in theory fully during solid solution, above-mentioned temperature of superheat is 850～900 ℃.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105256263A (en) * | 2015-12-01 | 2016-01-20 | 天津东义镁制品股份有限公司 | Magnesium alloy heat-treatment method |
| CN115874094A (en) * | 2022-11-14 | 2023-03-31 | 湘潭大学 | Mg-Se-X alloy material and application thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1995425A (en) * | 2006-12-29 | 2007-07-11 | 清华大学 | Magnesium alloy and its preparation method |
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| CN1995425A (en) * | 2006-12-29 | 2007-07-11 | 清华大学 | Magnesium alloy and its preparation method |
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| Title |
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| 《中国优秀硕士学位论文全文数据库》 20100115 王中国 过热温度和冷却过程对AZ系列镁合金铸态组织的影响 9、10、45 1-2 , 第1期 2 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105256263A (en) * | 2015-12-01 | 2016-01-20 | 天津东义镁制品股份有限公司 | Magnesium alloy heat-treatment method |
| CN115874094A (en) * | 2022-11-14 | 2023-03-31 | 湘潭大学 | Mg-Se-X alloy material and application thereof |
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