CN102021456A - Method for determining directional solidification of once dendritic crystal spacing by controlling crystal growth rate - Google Patents
Method for determining directional solidification of once dendritic crystal spacing by controlling crystal growth rate Download PDFInfo
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- CN102021456A CN102021456A CN 201010508968 CN201010508968A CN102021456A CN 102021456 A CN102021456 A CN 102021456A CN 201010508968 CN201010508968 CN 201010508968 CN 201010508968 A CN201010508968 A CN 201010508968A CN 102021456 A CN102021456 A CN 102021456A
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Abstract
The invention relates to a method for determining the directional solidification of once dendritic crystal spacing by controlling the crystal growth rate, belonging to the technical field of directional solidification. The method is characterized in that the directional solidification of an Al-4.5% Cu alloy in a pull-down type vacuum directional solidification furnace under 5kg of crucible; the temperature is controlled by three groups of thermocouples arranged in a heating element; the temperature is controlled to +/- 5K when working; the thermocouples are arranged in parallel to the heat flow direction of the crucible when working; the temperature distribution is measured by utilizing the thermocouples in the courses of heating and cooling. In order to guarantee the temperature of the furnace, the cooling water (at the constant temperature) is maintained to the constant water pressure, and the distance between the cooling water and a heating table is simultaneously fixed so as to guarantee that the temperature is constant in a gradient mode when working. The method has the advantages that the control of the crystal growth rate is realized by controlling the pull-down rate of a motor; the Al-4.5% Cu alloy is selected by the method; and the internal relation of the crystal growth rate and the once dendritic crystal spacing is obtained through the relevant parameters and data.
Description
Technical field
The invention belongs to the directional solidification technique field, refer in particular to a kind of method of controlling crystal growth rate decision directional freeze primary dendritic spacing.
Background technology
Metal solidification process is to be principal mode with the dendritic growth, and dendritic structure feature and freezing interface directly affect the performance of solidified structure and material.Wherein dendrite interval is solute in the decision alloy structure, the middle important solidified structure parameter that equates character.Crystal is when directional solidification growth, and the column crystal direction of growth is parallel with direction of heat flow, and both directions are opposite, and crystal is grown in liquid with certain speed.The dendrite tip temperature equates that with the metal or alloy liquidus temperature its crystal boundary is parallel with the main shaft of dendrite, and the main shaft of dendrite constantly produces branch, forms a full die at last.For the dendrite that is arranged in parallel, their interval is defined as primary dendritic spacing.In directional solidification theory, crystal growth rate is the important technical parameter in the directional solidification technique, is an important factor that influences metal freezing, dendritic growth.Determined crystalline microstructure (being dendrite interval), the little then crystal grain of dendrite interval is tiny, and alloy property improves, and therefore can satisfy the needs in fields such as engineering.The research for the influence factor of oriented freezing organization at present both at home and abroad generally concentrates on qualitative analysis, about oriented freezing organization and controlled quantitative examination of solidifying parameters relationship comprehensive research is not arranged as yet at present in alloy graining process.
The present invention is directed to this problem, developed a kind of method of controlling crystal growth rate decision directional freeze primary dendritic spacing.
Summary of the invention
Purpose of the present invention provides a kind of method of controlling crystal growth rate decision directional freeze primary dendritic spacing.The concrete technical scheme of the present invention is directional freeze Al-4.5%Cu alloy primary dendritic spacing to be controlled, to satisfy the demand in fields such as engineering.It is characterized in that: directional freeze Al-4.5%Cu alloy carries out vacuum oriented the solidifying in the stove of 5kg crucible pull-down, and its temperature is by three groups of thermopair controls that are contained in heating unit, and temperature is controlled at ± 5K during work.The placement of thermopair parallels with the crucible direction of heat flow at work, in the heating and cooling process, records temperature distribution with thermopair.In order to guarantee furnace temperature, keep water coolant (steady temperature) in constant water pressure, the fixing distance between water coolant and the heating platform simultaneously, thermograde is constant when guaranteeing work.Drop-down speed by the control motor realizes controlling the speed of crystal growth, and when not being very big (less than 100r/min), the withdrawing rate of motor can be approximately equal to the crystalline growth velocity at withdrawing rate.The present invention selects the Al-4.5%Cu alloy for use, by the correlation parameter data of table 1, draws the internal relation of crystal growth rate and primary dendritic spacing.Table 1 is correlation parameter data of the present invention.
Table 1 correlation parameter data
Learn by the inventive method: during withdrawing rate 40r/min, record primary dendritic spacing 327.6 μ m; During withdrawing rate 60r/min, record primary dendritic spacing 159.7 μ m; During withdrawing rate 80r/min, record primary dendritic spacing 125.7 μ m; But withdrawing rate can not increase again, and during near 100r/min, the withdrawing rate of motor has been not equal to the crystalline growth velocity, therefore can't record primary dendritic spacing.
Description of drawings
Solidified structure cross-sectional view under the different withdrawing rates of Fig. 1
(a)V＝40r/min (b)V＝60r/min (c)V＝80r/min
As seen from Figure 1, (Fig. 1 a) does not have obvious directional solidification feature, and cross section tissue is flourishing dendrite, and this is because withdrawing rate is slow, and dendrite has due to the time enough growth when withdrawing rate very low (40r/min). Along with the increase of withdrawing rate, reach after the 60r/min, can find out that from Fig. 1 (b) " ten " font dendrite on the cross section is very obvious, and arrange also relatively neat, orderly. Along with the further increase (when reaching 80r/min) of withdrawing rate, dendrite interval further dwindles, dendrite refinement (Fig. 1 c).
Embodiment
Embodiment 1
Directional freeze Al-4.5%Cu alloy carries out vacuum oriented the solidifying in the stove of 5kg crucible pull-down, and its temperature is by three groups of thermopair controls that are contained in heating unit, and temperature is controlled at ± 5K during work.Drop-down speed by the control motor realizes controlling the speed of crystal growth, and when not being very big (less than 100r/min), the withdrawing rate of motor can be approximately equal to the crystalline growth velocity at withdrawing rate.The present invention selects Al-4.5%Cu alloy (correlation parameter sees Table 1) for use, and when withdrawing rate very low (40r/min), Fig. 1 (a) does not have tangible directional freeze feature, and cross section tissue is flourishing dentrite, records primary dendritic spacing 327.6 μ m.
Embodiment 2
Directional freeze Al-4.5%Cu alloy carries out vacuum oriented the solidifying in the stove of 5kg crucible pull-down, and its temperature is by three groups of thermopair controls that are contained in heating unit, and temperature is controlled at ± 5K during work.Drop-down speed by the control motor realizes controlling the speed of crystal growth, and when not being very big (less than 100r/min), the withdrawing rate of motor can be approximately equal to the crystalline growth velocity at withdrawing rate.The present invention selects Al-4.5%Cu alloy (correlation parameter sees Table 1) for use, when withdrawing rate improves (reaching 60r/min), can find out that from Fig. 1 (b) " ten " font dendrite on the cross section is very obvious, and arrange also relatively neatly, in order, record primary dendritic spacing 159.7 μ m.
Embodiment 3
Directional freeze Al-4.5%Cu alloy carries out vacuum oriented the solidifying in the stove of 5kg crucible pull-down, and its temperature is by three groups of thermopair controls that are contained in heating unit.Temperature is controlled at ± 5K during work.Drop-down speed by the control motor realizes controlling the speed of crystal growth, and when not being very big (less than 100r/min), the withdrawing rate of motor can be approximately equal to the crystalline growth velocity at withdrawing rate.The present invention selects Al-4.5%Cu alloy (correlation parameter sees Table 1) for use, when withdrawing rate further improves (reaching 80r/min), can see further increase from Fig. 1 (c) along with withdrawing rate, dendrite interval further dwindles, the dendrite refinement records primary dendritic spacing 125.7 μ m.
Claims (3)
1. control the method that crystal growth rate determines the directional freeze primary dendritic spacing for one kind, it is characterized in that: directional freeze Al-4.5%Cu alloy carries out vacuum oriented the solidifying in the stove of 5kg crucible pull-down, its temperature is by three groups of thermopair controls that are contained in heating unit, and temperature is controlled at ± 5K during work; The placement of thermopair parallels with the crucible direction of heat flow at work, in the heating and cooling process, records temperature distribution with thermopair; In order to guarantee furnace temperature, keep water coolant (steady temperature) in constant water pressure, the fixing distance between water coolant and the heating platform simultaneously, thermograde is constant when guaranteeing work; Drop-down speed by the control motor realizes controlling the speed of crystal growth, and when not being very big (less than 100r/min), the withdrawing rate of motor can be approximately equal to the crystalline growth velocity at withdrawing rate; The present invention selects the Al-4.5%Cu alloy for use, by the correlation parameter data of table 1, draws the internal relation of crystal growth rate and primary dendritic spacing; Table 1 is correlation parameter data of the present invention.
Table 1 correlation parameter data
2. a kind of method of controlling crystal growth rate decision directional freeze primary dendritic spacing according to claim 1, directional freeze Al-4.5%Cu alloy during withdrawing rate 40r/min, records primary dendritic spacing 327.6 μ m; During withdrawing rate 60r/min, record primary dendritic spacing 159.7 μ m; During withdrawing rate 80r/min, record primary dendritic spacing 125.7 μ m; But withdrawing rate can not increase again, and during near 100r/min, the withdrawing rate of motor has been not equal to the crystalline growth velocity, therefore can't record primary dendritic spacing.
3. a kind of method of controlling crystal growth rate decision directional freeze primary dendritic spacing according to claim 2, directional freeze Al-4.5%Cu alloy is when withdrawing rate can be preferably 80r/min.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102303111A (en) * | 2011-09-21 | 2012-01-04 | 镇江忆诺唯记忆合金有限公司 | Melt overheating treatment temperature for thinning aluminum-copper alloy directional solidification structure |
| CN102343433A (en) * | 2011-09-21 | 2012-02-08 | 镇江忆诺唯记忆合金有限公司 | Determining method of directional solidification parameter temperature gradient T0 and solidification rate V0 of aluminum copper alloy |
| CN103791862A (en) * | 2014-01-21 | 2014-05-14 | 首钢总公司 | Method for measuring interval of continuous casting blank dendritic crystal with manganese steel |
| CN104372400A (en) * | 2013-08-16 | 2015-02-25 | 镇江忆诺唯记忆合金有限公司 | Method for controlling aluminum-copper alloy directional solidification primary dendrite arm spacing by use of Ce |
| CN111118357A (en) * | 2020-01-17 | 2020-05-08 | 四川大学 | Aluminum-copper-tellurium alloy and preparation method thereof |
-
2010
- 2010-10-15 CN CN 201010508968 patent/CN102021456A/en active Pending
Non-Patent Citations (3)
| Title |
|---|
| 《中国博士学位论文全文数据库 工程科技I辑》 20090915 刘海霞 工艺因素对Al-4.5%Cu合金定向凝固组织及性能的影响 B022-6 1-3 , 第9期 2 * |
| 《中国有色金属学报》 20070731 吴强等 定向凝固Al-4.5%Cu合金枝晶组织与抽拉速率的关系 1101-1106 1-3 第17卷, 第7期 2 * |
| 《铸造》 20050131 刘海霞等 不同拉伸速度对Al-5%Cu定向凝固组织的影响 40-43 1-3 第54卷, 第1期 2 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102303111A (en) * | 2011-09-21 | 2012-01-04 | 镇江忆诺唯记忆合金有限公司 | Melt overheating treatment temperature for thinning aluminum-copper alloy directional solidification structure |
| CN102343433A (en) * | 2011-09-21 | 2012-02-08 | 镇江忆诺唯记忆合金有限公司 | Determining method of directional solidification parameter temperature gradient T0 and solidification rate V0 of aluminum copper alloy |
| CN104372400A (en) * | 2013-08-16 | 2015-02-25 | 镇江忆诺唯记忆合金有限公司 | Method for controlling aluminum-copper alloy directional solidification primary dendrite arm spacing by use of Ce |
| CN103791862A (en) * | 2014-01-21 | 2014-05-14 | 首钢总公司 | Method for measuring interval of continuous casting blank dendritic crystal with manganese steel |
| CN111118357A (en) * | 2020-01-17 | 2020-05-08 | 四川大学 | Aluminum-copper-tellurium alloy and preparation method thereof |
| CN111118357B (en) * | 2020-01-17 | 2021-06-08 | 四川大学 | Aluminum-copper-tellurium alloy and preparation method thereof |
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Application publication date: 20110420 |