CN102645446A - Online detection method of grain refinement and metamorphism effect of aluminum alloy melt - Google Patents
Online detection method of grain refinement and metamorphism effect of aluminum alloy melt Download PDFInfo
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- CN102645446A CN102645446A CN2012101559930A CN201210155993A CN102645446A CN 102645446 A CN102645446 A CN 102645446A CN 2012101559930 A CN2012101559930 A CN 2012101559930A CN 201210155993 A CN201210155993 A CN 201210155993A CN 102645446 A CN102645446 A CN 102645446A
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Abstract
The invention provides an online detection method of the grain refinement and metamorphism effect of aluminum alloy melt. The method comprises the following steps of: injecting the melt into a crucible, and controlling the injection temperature of the melt in crucible at 640-670 DEG C, the crucible preheating temperature at 300-400 DEG C and the cooling rate of the melt at (-0.5)-(-0.6) DEG C per second; and realizing the acquisition and analysis of the thermal analysis data and result output through a thermal analyzer to obtain a thermal analysis cooling curve, thereby obtaining the recalescence supercooling degree value reflecting the melt grain refinement and marked as dTL and the eutectic growth supercooling degree value reflecting the metamorphism degree and marked as dTS, wherein the less dTL indicates smaller grain, and the greater dTS indicates better metamorphism effect. The method provided by the invention can be used as a ladle analysis means to detect the quality of the alloy melt before pouring to predict the alloy grain refinement and metamorphism effect; and the method is easy and feasible, and the detection cost is low.
Description
Technical field
The present invention relates to the analytical approach in a kind of aluminium alloy smelting process, be specifically related to the method for grain refinement of a kind of online detection aluminium alloy melt and modification effect.
Background technology
Thermal analysis system is through measuring a kind of method for testing and analyzing that the caused rerum natura of material variation of temperature changes to confirm the state of matter variation; Promptly follow the macroscopic property that the carrying out of temperature variation and the chemical reaction of material take place, the variation of physical property through mensuration, and then a kind of method of the thermal distortion of definite structure of matter and chemical reaction constant.In alloy, no matter take place any variation (crystallization, the ppolymorphism during like the fusing in when heating, cooling change, solid-state in surplus fuse mutually or separate out etc.); All be attended by the release or the absorption of heat; Thereby make when rising or descending because of the cooling temperature because of the heating temperature; The continuity of temperature variation is damaged and demonstrates the temperature profile value, on heating or cooling curve, forms " flex point " or " platform ".So the various thermal distortion of alloy melt in cooling procedure comprise grain refinement and metamorphic process, all can on cooling curve, stay corresponding vestige.
In the past to the alloy refinement modification effect often through dissecing foundry goods, grind metallographic specimen and detect, not only the cycle long, cost an arm and a leg but also can not on-the-spot guidance work.Cast fracture sample commonly used in producing at present, the visual inspection fracture detects the refinement modification effect, and this method more relies on operating personnel's experience, and reliability is not high.
Increasing in the world at present Foundry Works utilizes thermoanalysis technology to carry out both analysis.Like AM General auto maker and manufacturing company of Ford Motor and Ukraine etc. all with the important means of thermal analysis system as the control of stokehold alloy mass.With abroad compare, the application of domestic thermal analysis system also has certain gap, and uses also immature.If can thermoanalysis technology be combined with Microcomputer Technology; Develop the method for grain refinement of online detection alloy melt and modification effect; Reduce the thermoanalysis technology cost, improve reliability, accuracy and the intellectuality of test, will promote thermoanalysis technology in Foundry Production, to use widely; The casting quality of China is steadily improved, strengthen the competitive strength of China on international foundry goods market.
Summary of the invention
The problem that the present invention will solve provides and a kind of thermoanalysis technology and heat analysis method is combined, and optimizes the detection method of on-line prediction aluminium alloy melt grain refinement and modification effect, is particularly useful for the detection of AS7G03 aluminium alloy.
For solving the problems of the technologies described above; The technical scheme that the present invention uses is: the method for grain refinement of a kind of online detection aluminium alloy melt and modification effect, melt is injected in the crucible, and the implantation temperature of melt is 640 ℃～670 ℃ in the control crucible; The crucible preheat temperature is 300 ℃～400 ℃; The cooldown rate of control melt is-0.5～-0.6 ℃/S, realizes that through thermal analyzer collection, analysis and the result of heat analysis data exports, and obtains heat and analyzes cooling curve; And then obtain reflecting and the recalescence degree of supercooling numerical value of melt grain refinement be labeled as dTL; And the eutectic growth degree of supercooling numerical value of reflection metamorphic grade, be labeled as dTS; The dTL value is more little, and crystal grain is tiny more; DTS is big more, and modification effect is good more.
Preferably, the present invention realizes the control to cooldown rate through crucible being added heat-insulation layer.
Preferably, melt according to the invention is an alloy designations AS7G03 aluminium alloy, and alloying component is as shown in table 1.
The chemical constitution (wt%) of table 1AS7G03 aluminium alloy
Hot analysis principle is: melt is poured in the crucible, measured the temperature of its process of setting, draw temperature-time curve, this curve also is cooling curve.Use heat analysis method, can from cooling curve or its first order derivative, obtain eigenwert, so just can set up the relation between these eigenwerts and some quality index (like crystallite dimension, eutectic structure, silicon phase or the like).
The implantation temperature of aluminium alloy melt, crucible preheat temperature, cooldown rate have tangible influence to cooling curve.Table 2 be same stove AS7G03 melt under different controlled variable, the cooling curve eigenwert that draws.The inventor finds through a large amount of experiments, and when the melt implantation temperature is low excessively, the crucible preheat temperature is low excessively, and cooldown rate is too small, causes the cooling curve eigenwert disorderly, final hot analysis result mistake (like 1～No. 6 sample in the table 2).Therefore use thermal analyzer (like the TA110 portable aluminium liquid thermal analyzer of Switzerland brilliance Science and Technology Ltd. production) when doing thermal analysis experiment; Suitable melt implantation temperature, crucible preheat temperature, cooldown rate must be provided; Promptly controlling implantation temperature is 640～670 ℃; 300 ℃～400 ℃ of crucible preheat temperatures, the cooldown rate of melt are stability and the correctness (like 7～No. 11 samples in the table 2) that-0.5～-0.6 ℃/S could guarantee experimental data.
Further, with dTL＜0.6, dTS >=2 are as judging the qualified foundation of AS7G03 aluminium alloy refinement modification effect.
In the table 2 and table 3 of instructions, what TG represented is the implantation temperature that melt injects crucible, and what T ' max represented is the cooldown rate of melt.
The eigenwert of cooling curve under the different controlled variable of table 2
Advantage and good effect that the present invention has are:
1, the cooldown rate of control melt implantation temperature, crucible preheat temperature, melt cast amount, melt can access stable hot analysis result, and then accurately detect aluminium alloy melt grain refinement and modification effect within the scope of the present invention the time.
2, as the on-the-spot sample analysis means, before cast, detect the quality of alloy melt, prediction alloy grain refinement and modification effect, simple, it is low to detect cost.
3, thermoanalysis technology is combined with Microcomputer Technology, further reduce the thermoanalysis technology cost, improve reliability, accuracy and the intellectuality of test, be beneficial to instruct and produce, improve casting quality.
Description of drawings
Fig. 1 (a)-(f) is the metallograph of the AS7G03 aluminium alloy among the embodiment 1～6 successively.
Embodiment
Through specific embodiment the present invention is made further detailed description below, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
Thermal analyzer described in the embodiment 1-6 is the TA110 portable aluminium liquid thermal analyzer that Switzerland brilliance Science and Technology Ltd. produces.
Embodiment 1
Use the TA110 thermal analyzer that the AS7G03 aluminium alloy of different heats is carried out thermal analysis experiment.
A1 stove melt is injected in the crucible; Implantation temperature is 657.2 ℃, and 330 ℃ of crucible preheat temperatures, melt cooldown rate are-0.6 ℃/S; Realize collection, analysis and result's output of heat analysis data through thermal analyzer; Obtain heat and analyze cooling curve, and then obtain reflecting the recalescence degree of supercooling numerical value of melt grain refinement, be labeled as dTL; And the eutectic growth degree of supercooling numerical value of reflection metamorphic grade, being labeled as dTS, experimental data is as shown in table 3.
DTL and dTS are the hot analytical characteristic parameter that thermal analyzer reads automatically.
The interior AS7G03 aluminium liquid of A1 smelting furnace this moment is poured into ingot casting, and sawing also grinds metallographic specimen, under MIT300 type metaloscope, observes the microstructure of ingot casting then, and takes metallograph, shown in Fig. 1 (a).
Embodiment 2
Be with embodiment 1 difference: A2 stove AS7G03 melt is injected crucible, and implantation temperature is 646.6 ℃, and 360 ℃ of crucible preheat temperatures, melt cooldown rate are-0.6 ℃/S.
Experimental data is as shown in table 3, and the metallograph of A2 stove ingot casting is shown in Fig. 1 (b).
Embodiment 3
Be with embodiment 1 difference: A3 stove AS7G03 melt is injected crucible, and implantation temperature is 649.2 ℃, and 340 ℃ of crucible preheat temperatures, melt cooldown rate are-0.6 ℃/S.
Experimental data is as shown in table 3, and the metallograph of A32 stove ingot casting is shown in Fig. 1 (c).
Embodiment 4
Be with embodiment 1 difference: A4 stove AS7G03 melt is injected crucible, and implantation temperature is 653.4 ℃, and 350 ℃ of melt cooldown rates of crucible preheat temperature are-0.6 ℃/S.
Experimental data is as shown in table 3, and the metallograph of A4 stove ingot casting is shown in Fig. 1 (d).
Embodiment 5
Be with embodiment 1 difference: A5 stove AS7G03 melt is injected crucible, and implantation temperature is 660.4 ℃, and 380 ℃ of crucible preheat temperatures, melt cooldown rate are-0.6 ℃/S.
Experimental data is as shown in table 3, and the metallograph of A5 stove ingot casting is shown in Fig. 1 (e).
Embodiment 6
Be with embodiment 1 difference: A6 stove AS7G03 melt is injected crucible, and implantation temperature is 664.3 ℃, and 350 ℃ of crucible preheat temperatures, melt cooldown rate are-0.6 ℃/S.
Experimental data is as shown in table 3, and the metallograph of A6 stove ingot casting is shown in Fig. 1 (f).
For more intuitive explanation, with the form of form the test figure that relates among the embodiment is tabulated as follows below:
Table 3 thermal analysis experiment cooling curve eigenwert
Can find out from the data and the corresponding metallograph (Fig. 1 (a)～(f)) of table 3: melt implantation temperature, crucible preheat temperature, cooldown rate are within the scope of the invention; Carry out thermal analysis experiment; DTL reduces along with the recalescence degree of supercooling, and eutectic growth degree of supercooling dTS increases, and the crystal grain of AS7G03 alloy is more and more tiny; Eutectic Silicon in Al-Si Cast Alloys is also more and more shorter and smaller, and modification effect is become better and better.When dTL＜0.6, dTS >=2 o'clock, the refinement modification effect of AS7G03 alloy normal ((d)) like figure (a), (c), when eigenwert was not in this scope, Eutectic Silicon in Al-Si Cast Alloys became needle-like and en plaque, and crystal grain is thick, refinement modification effect poor (like figure (b), (e) (f)).
More than embodiments of the invention are specified, but said content is merely preferred embodiment of the present invention, can not be considered to be used to limit practical range of the present invention.All equalizations of doing according to application range of the present invention change and improve etc., all should still belong within the patent covering scope of the present invention.
Claims (3)
1. the method for online detection aluminium alloy melt grain refinement and modification effect is characterized in that:
Melt is injected in the crucible; The implantation temperature of melt is 640 ℃～670 ℃ in the control crucible, and the crucible preheat temperature is 300 ℃～400 ℃, and the cooldown rate of control melt is-0.5～-0.6 ℃/S; Realize collection, analysis and result's output of heat analysis data through thermal analyzer; Obtain heat and analyze cooling curve, and then obtain reflecting the recalescence degree of supercooling numerical value of melt grain refinement, be labeled as dTL; And the eutectic growth degree of supercooling numerical value of reflection metamorphic grade, be labeled as dTS; The dTL value is more little, and crystal grain is tiny more; DTS is big more, and modification effect is good more.
2. method according to claim 1 is characterized in that: realize the control to cooldown rate through crucible being added heat-insulation layer.
3. method according to claim 1 and 2 is characterized in that: said melt is the AS7G03 aluminium alloy, and with dTL＜0.6, dTS >=2 are as judging the qualified foundation of AS7G03 aluminium alloy refinement modification effect.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749337A (en) * | 2015-03-24 | 2015-07-01 | 沈阳理工大学 | Online detection method and device for aluminum alloy metamorphism effect based on neural network |
| CN108614004A (en) * | 2016-12-09 | 2018-10-02 | 上海大学 | A kind of approximating method and system of cooling curve |
| CN116312900A (en) * | 2023-05-17 | 2023-06-23 | 中信戴卡股份有限公司 | Hypoeutectic aluminum alloy melt manufacturability evaluation method |
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| US5833366A (en) * | 1995-10-16 | 1998-11-10 | National Research Council Of Canada | Method and apparatus for determining metal freezing points |
| CN101055261A (en) * | 2006-02-07 | 2007-10-17 | 合肥工大双发信息系统技术有限公司 | Metal liquid integrative performance on-line intelligent checking system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104749337A (en) * | 2015-03-24 | 2015-07-01 | 沈阳理工大学 | Online detection method and device for aluminum alloy metamorphism effect based on neural network |
| CN108614004A (en) * | 2016-12-09 | 2018-10-02 | 上海大学 | A kind of approximating method and system of cooling curve |
| CN108614004B (en) * | 2016-12-09 | 2020-03-27 | 上海大学 | Fitting method and system of cooling curve |
| CN116312900A (en) * | 2023-05-17 | 2023-06-23 | 中信戴卡股份有限公司 | Hypoeutectic aluminum alloy melt manufacturability evaluation method |
| CN116312900B (en) * | 2023-05-17 | 2023-07-28 | 中信戴卡股份有限公司 | Hypoeutectic aluminum alloy melt manufacturability evaluation method |
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Effective date of registration: 20200522 Address after: 300457 No. 58 Tai Thai Road, West Development Zone, Tianjin Binhai New Area Development Zone Patentee after: Tianjin xinlizhong alloy Group Co., Ltd Address before: 300457 economic and technological development of Binhai New Area, Tianjin, No. 58 Tai Chi Road, West End Patentee before: Tianjin Lizhong Alloy Group Co.,Ltd. |
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