CN112782235A - Method for determining homogenization effect evaluation criterion value and homogenization effect evaluation method - Google Patents
Method for determining homogenization effect evaluation criterion value and homogenization effect evaluation method Download PDFInfo
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Abstract
The invention belongs to the technical field of alloy performance detection, and discloses a method for determining an evaluation standard value of a homogenization effect, which comprises the following steps: and (3) carrying out homogenization tests on the samples at different times of heat preservation at the homogenization temperature, and finding out the highest value of the conductivity which does not increase any more along with the extension of the heat preservation time, namely the homogenization effect evaluation standard value. The invention also discloses a homogenization effect evaluation method, which comprises the following steps: and comparing the conductivity of the product needing to evaluate the homogenization effect with the homogenization effect evaluation standard value to finish the homogenization effect evaluation. Compared with the related technology, the invention defines the sampling, detecting and evaluating method and standard of the homogenization effect of the aluminum alloy round cast ingot, and improves the uniformity, representativeness and scientificity of the detection result.
Description
Technical Field
The invention belongs to the technical field of alloy performance detection, and particularly relates to a method for determining an evaluation standard value of a homogenization effect and an evaluation method of the homogenization effect.
Background
The 6XXX series aluminum alloy belongs to Al-Mg-Ai series wrought aluminum alloy, is characterized by high strength, good plasticity, weldability and corrosion resistance, is heat treatment-strenthenable aluminum alloy, and is widely used for building materials and industrial materials.
The homogenization of the aluminum alloy round ingot is the first heat treatment process of the production of wrought aluminum alloy. The homogenization can dissolve the non-equilibrium structure, eliminate dendrite segregation, and precipitate supersaturated solid solution elements from the solid solution, so that the structure of the circular cast ingot is uniform, thereby achieving the purposes of eliminating casting stress, improving plasticity and reducing deformation resistance. The uniformity of the round cast ingot can directly affect the processing performance and subsequent use performance of the material, the round cast ingot subjected to the uniformity treatment is easy to produce by extrusion and the like, and the surface quality, the comprehensive performance and the like of the round cast ingot are superior to those of the round cast ingot not subjected to the uniformity treatment. Before plastic working, the as-cast aluminum alloy is generally subjected to homogenization heat treatment for eliminating casting stress and segregation of alloy elements, thereby improving the deformation performance of the alloy. Research shows that the extrusion force of the homogenized 6XXX series aluminum alloy is 6-10% lower than that of the non-homogenized alloy.
In order to detect and evaluate the homogenization effect of the wrought aluminum alloy, in the related technology, YA/T67-2018 ' wrought aluminum and aluminum alloy round ingot ' stipulates that the microstructure of the homogenized round ingot is not allowed to be over-sintered ', the standard does not give specific quantitative evaluation rules and methods, and the method is implemented specifically as follows: and (4) carrying out metallographic observation after the sample preparation of the detection object, and judging whether the overburning exists after the metallographic picture is compared with the standard picture, but cannot judge whether the homogenization treatment is complete. And the surface polishing and corrosion of the test sample can affect the observation of the structure.
Therefore, the related art has the disadvantages that only the optical metallographic microscope is used for judging, certain special microstructures can be easily judged by mistake, the accuracy is not high, in addition, in the judging process, detection personnel are required to have abundant analysis experience, and a certain difficulty is brought to common material analysts, so that the working efficiency and the accuracy of result judgment are influenced.
Therefore, it is necessary to provide a new method for determining a standard value for evaluating a homogenization effect and a new method for evaluating a homogenization effect to solve the above-mentioned problems.
Disclosure of Invention
The invention aims to provide a homogenization effect evaluation method which is used for simply, quickly and accurately evaluating the homogenization effect of an aluminum alloy round cast ingot.
The invention discloses a method for determining an evaluation standard value of a homogenization effect, which comprises the following steps:
a1, determining the homogenization temperature according to the aluminum alloy grade of the aluminum alloy cylindrical ingot to be detected;
a2, taking n aluminum alloy cylindrical ingot detection samples to be detected, preserving heat at the homogenization temperature determined in the step A1, and defining the n aluminum alloy cylindrical ingot detection samples to be detected as a detection sample 1, a detection sample 2 and a detection sample 3. the detection sample n-1 and the detection sample n respectively; wherein n is a natural number not less than 6;
a3, wherein the conductivity of the detection sample 1 after heat preservation for 1h in the homogenization temperature is K1;
the conductivity of the detection sample 2 after the heat preservation time of the detection sample at the homogenization temperature is 2h is K2;
the conductivity of the detection sample 3 after the heat preservation time of the detection sample at the homogenization temperature is 3h is K3;
...；
the conductivity of the detection sample n-1 is Kn-1 after the temperature preservation time of the detection sample n-1 in the homogenization temperature is n-1 h;
the conductivity of the detection sample n is Kn after the temperature preservation time of the detection sample n in the homogenization temperature is n h;
a4, analyzing the conductivity data of each detection sample in the step A3, and finding out the highest conductivity value of which the conductivity does not increase any more with the prolonging of the heat preservation time, wherein the highest conductivity value is the homogenization effect evaluation standard value of the aluminum alloy cylindrical ingot to be detected.
Preferably, n is 10.
Preferably, the aluminum alloy according to the aluminum alloy cylindrical ingot to be detected is a 6xxx aluminum alloy.
Preferably, the aluminum alloy according to the aluminum alloy cylindrical ingot to be detected is a 7xxx aluminum alloy.
Preferably, in step a3, the conductivity of each test sample is measured by:
b1, sampling
Respectively cutting a wafer with the thickness of 20-25mm at the position of the homogenized aluminum alloy round ingot, which is respectively away from the head and the tail end by 100-200mm, as a test piece, milling the measuring surface of the test piece, and wiping the test piece to obtain two test pieces for detection;
b2, region division
Drawing two mutually perpendicular diameter lines on the test piece for detection obtained in the step B1 by taking the circle center as the center, dividing the test piece into 4 quadrants, and respectively marking X1, X2, X3 and X4;
b3, detecting the conductivity of the test piece in quadrants X1, X2, X3 and X4 in the step B2 respectively to obtain eight groups of conductivity values and record the conductivity values;
and B4, obtaining the average value of the eight groups of conductivity values in the step B3, wherein the average value is the conductivity result after the aluminum alloy round ingots in the batch are homogenized.
Preferably, in step B1, one wafer is cut out from each of the homogenized aluminum alloy round ingots at a distance of 100mm from the head and tail ends thereof, and the cut wafers are used as test pieces.
Preferably, in step B1, the thickness of the cut test piece is 20 mm.
Preferably, in step B3, the test piece conductivity is measured by using an eddy current conductivity meter.
Preferably, in step a2, each test sample is heated to the homogenization temperature in a muffle furnace and then incubated.
The invention also discloses a homogenization effect evaluation method, which comprises the following steps:
c1, determining a homogenization evaluation criterion value defined as D according to the above method;
c2, taking the homogenized aluminum alloy round cast product to be detected, and measuring the electrical conductivity of the aluminum alloy round cast product according to the electrical conductivity test method disclosed in the invention, wherein the value is defined as E;
c3, data comparison and evaluation
If E is larger than or equal to D, judging that: the homogenization effect of the aluminum alloy round cast product to be detected after homogenization treatment is achieved;
if E < D, judging that: the homogenization effect of the homogenization treated aluminum alloy round cast product to be detected is not achieved.
Compared with the prior art, the method has the advantages of defining sampling, detecting and evaluating methods and standards of the homogenization effect of the aluminum alloy round cast ingot and improving the uniformity, representativeness and scientificity of the detection result. The method is simple and convenient to measure, has good data reproducibility, and is a better method for evaluating the homogenization effect of the aluminum alloy.
Detailed Description
The present invention will be further described with reference to the following embodiments. Specifically, a 6061 aluminum alloy round ingot is taken as an example.
Example 1
The embodiment provides a method for determining a standard value for evaluating the homogenization effect of a 6061 aluminum alloy round ingot, which comprises the following steps of:
s1, taking a 6061 aluminum alloy round ingot, homogenizing the temperature, setting the homogenization temperature at 570 ℃, and respectively preserving the heat for 1h, 3h, 5h, 7h and 9 h. It should be noted that the larger the incubation time interval, the corresponding increase in the required sample, the more labor intensive the effort, but the more accurate the results. The smaller the heat preservation time interval is, the less the required samples are correspondingly reduced, the less the labor intensity is paid out, and the better the efficiency is. And during specific selection, selection is carried out according to actual conditions.
S2, taking the homogenized aluminum alloy round ingot, and respectively cutting a wafer as a test piece at the position 100mm away from the head end and the tail end of the homogenized aluminum alloy round ingot, wherein the thickness of the wafer is 20 mm. And washing the measuring surface of the test piece, and wiping the test piece clean.
S3, drawing two perpendicular diameter lines with the center of circle as the center, dividing the test piece into 4 quadrants, X1, X2, X3, and X4.
And S4, detecting the conductivity of all test pieces by using the FD101 digital portable eddy current conductivity meter, and recording the value.
S5, and carrying out statistics on the conductivity of 6061 aluminum alloy under various homogenization systems, wherein the specimen without homogenization is 22.47% IACA, the specimen with homogenization 1h is 25.12% IACA, the specimen with homogenization 3h is 27.41% IACA, the specimen with homogenization 5h is 27.89% IACA, the specimen with homogenization 7h is 27.88% IACA, and the specimen with homogenization 9h is 27.89% IACA.
And S6, analyzing the conductivity data of each detection sample according to the data in the step 5, and determining the value as the homogenization effect evaluation standard value of the aluminum alloy cylindrical ingot to be detected as the conductivity value corresponding to 5-hour homogenization is the highest conductivity value of which the conductivity is not increased any more along with the extension of the heat preservation time. That is, the homogenization effect evaluation criterion value was a conductivity value 27.89% IACA corresponding to 5-hour homogenization, and the homogenization effect evaluation criterion value was 27.9% IACA with an accuracy one decimal after.
In addition, the 6061 aluminum alloy round ingot homogenizing effect evaluation standard value is determined through the steps to be the conductivity value 27.9% IACA corresponding to 5-hour homogenization. The 6061 aluminum alloy round ingot can be subjected to heat preservation for 5 hours at the homogenization temperature of 570 ℃, and the homogenization effect can be achieved. The numerical value can be used for guiding production, and the heat preservation time is shortened while the homogenization effect is ensured.
Example 2
The technical scheme of the invention is explained by taking the process of evaluating the homogenization effect of the 6061 aluminum alloy round ingot as an example.
When the homogenizing effect of a 6061 aluminum alloy round ingot needs to be evaluated, the invention provides a homogenizing effect evaluation method, which comprises the following steps:
determining a homogenization effect evaluation criterion value, which is defined as D, according to the homogenization effect evaluation criterion value determination method of example 1, and the D value is 27.9% IACA;
c2, taking the homogenized aluminum alloy round cast product to be detected, measuring the electrical conductivity of the aluminum alloy round cast product according to the electrical conductivity test method in the embodiment 1, and defining the value as E;
c3, data comparison and evaluation
If the E value is more than or equal to 27.9% IACA, judging that: the homogenization effect of the aluminum alloy round cast product to be detected after homogenization treatment is achieved;
if the E value is less than 27.9% IACA, judging that: the homogenization effect of the homogenization treated aluminum alloy round cast product to be detected is not achieved.
Compared with the prior art, the method has the advantages of defining sampling, detecting and evaluating methods and standards of the homogenization effect of the aluminum alloy round cast ingot and improving the uniformity, representativeness and scientificity of the detection result. The method is simple and convenient to measure, has good data reproducibility, and is a better method for evaluating the homogenization effect of the aluminum alloy.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A method for determining an evaluation standard value of a homogenization effect is characterized by comprising the following steps:
a1, determining the homogenization temperature according to the aluminum alloy grade of the aluminum alloy cylindrical ingot to be detected;
a2, taking n aluminum alloy cylindrical ingot detection samples to be detected, preserving heat at the homogenization temperature determined in the step A1, and defining the n aluminum alloy cylindrical ingot detection samples to be detected as a detection sample 1, a detection sample 2 and a detection sample 3. the detection sample n-1 and the detection sample n respectively; wherein n is a natural number not less than 6;
a3, wherein the conductivity of the detection sample 1 after heat preservation for 1h in the homogenization temperature is K1; the conductivity of the detection sample 2 after the heat preservation time of the detection sample at the homogenization temperature is 2h is K2; the conductivity of the detection sample 3 after the heat preservation time of the detection sample at the homogenization temperature is 3h is K3; ...; the conductivity of the detection sample n-1 is Kn-1 after the temperature preservation time of the detection sample n-1 in the homogenization temperature is n-1 h; the conductivity of the detection sample n is Kn after the temperature preservation time of the detection sample n in the homogenization temperature is nh;
a4, analyzing the conductivity data of each detection sample in the step A3, and finding out the highest conductivity value of which the conductivity does not increase any more with the prolonging of the heat preservation time, wherein the highest conductivity value is the homogenization effect evaluation standard value of the aluminum alloy cylindrical ingot to be detected.
2. The method of determining a homogenization evaluation criterion value according to claim 1 wherein n is 10.
3. The method for determining the homogenization evaluation criterion value according to claim 1, wherein the aluminum alloy of the aluminum alloy cylindrical ingot to be detected is a 6xxx aluminum alloy.
4. The method for determining the homogenization evaluation criterion value according to claim 1, wherein the aluminum alloy of the aluminum alloy cylindrical ingot to be detected is a 7xxx aluminum alloy.
5. The method for determining the criterion value for evaluating the homogenization effect according to claim 1, wherein in the step a3, the test method for the conductivity of each test sample is:
b1, sampling
Respectively cutting a wafer with the thickness of 20-25mm at the position of the homogenized aluminum alloy round ingot, which is respectively away from the head and the tail end by 100-200mm, as a test piece, milling the measuring surface of the test piece, and wiping the test piece to obtain two test pieces for detection;
b2, region division
Drawing two mutually perpendicular diameter lines on the test piece for detection obtained in the step B1 by taking the circle center as the center, dividing the test piece into 4 quadrants, and respectively marking X1, X2, X3 and X4;
b3, detecting the conductivity of the test piece in quadrants X1, X2, X3 and X4 in the step B2 respectively to obtain eight groups of conductivity values and record the conductivity values;
and B4, obtaining the average value of the eight groups of conductivity values in the step B3, wherein the average value is the conductivity result after the aluminum alloy round ingots in the batch are homogenized.
6. The method according to claim 5, wherein in step B1, one wafer is cut out from each of the homogenized aluminum alloy round ingots at a distance of 100mm from the leading and trailing ends thereof, and used as the test piece.
7. The method for determining the criterion value for the evaluation of the homogenization effect according to claim 5, wherein in step B3, the test piece conductivity is measured using an eddy current conductivity meter.
8. The method for determining the criterion value for the evaluation of the homogenization effect according to claim 6, wherein in the step B1, the cut test piece has a thickness of 20 mm.
9. The method according to claim 1, wherein in step A2, each test sample is heated in a muffle furnace to the homogenization temperature and held at the homogenization temperature.
10. A homogenization effect evaluation method is characterized by comprising the following steps:
c1, determining a homogenization evaluation criterion value according to the method for determining a homogenization evaluation criterion value of any one of claims 1 to 9, which value is defined as D;
c2, taking the homogenized aluminum alloy round cast product to be detected, and measuring the electrical conductivity of the aluminum alloy round cast product according to the electrical conductivity test method in the claim 5, wherein the value is defined as E;
c3, data comparison and evaluation
If E is larger than or equal to D, judging that: the homogenization effect of the aluminum alloy round cast product to be detected after homogenization treatment is achieved;
if E < D, judging that: the homogenization effect of the homogenization treated aluminum alloy round cast product to be detected is not achieved.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117949278A (en) * | 2024-03-26 | 2024-04-30 | 有研工程技术研究院有限公司 | Method for evaluating homogenization effect of 7xxx series aluminum alloy cast ingot |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117949278A (en) * | 2024-03-26 | 2024-04-30 | 有研工程技术研究院有限公司 | Method for evaluating homogenization effect of 7xxx series aluminum alloy cast ingot |
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