Method and apparatus for evaluating internal stress of amorphous alloy strip

Abstract

The application discloses a kind of amorphous alloy strip internal stress evaluation method and device, belong to amorphous alloy stress measurement technical field, wherein method includes making strip sample and measuring the sound data generated in rotating process of strip sample, and the internal stress of strip sample is evaluated based on sound data.By selecting strip-shaped strip as sample test, during the test, one end of the strip sample is fixed, and periodic rotation excitation is applied to the strip sample in clamped state, driving the mechanical vibration of the strip sample, and the sound information generated when the sample vibrates is detected by the acquisition component, so as to evaluate the internal stress level of the strip.And the acoustic characteristics of samples from different sources can be compared to indirectly measure the internal stress, which is simple to operate, efficient, low in cost and reliable in technology, and can effectively evaluate the internal stress level of amorphous alloy strip.

Description

Technical Field

[0001] This application belongs to the field of amorphous alloy stress measurement technology, specifically relating to a method and apparatus for evaluating the internal stress of amorphous alloy strips. Background Technology

[0002] Amorphous alloy strips, due to their unique disordered atomic arrangement and amorphous structure, possess excellent mechanical and soft magnetic properties, and are widely used in transformers, magnetic sensors, electronic components, and aerospace applications. During fabrication, molten metal is typically sprayed onto a high-speed rotating roller to form a continuous strip. However, during rapid solidification, the liquid metal cools rapidly to form an amorphous state. Due to imbalances in atomic spacing or arrangement, as well as differences in solidification rates between the strip's surface and interior, internal stresses are inevitably generated.

[0003] The internal stress introduced during the strip fabrication process not only causes unevenness on the strip surface, strip warping, and deterioration of the stacking coefficient, but also plays a major role in the anisotropy formed by the magnetoelastic coupling effect on the magnetic domain structure and its magnetization process, thus having a significant impact on the magnetic properties of the alloy. For example, internal stress can hinder the movement of magnetic domain walls, thereby significantly increasing the coercivity of soft magnetic amorphous alloys, and further increasing the hysteresis loss of soft magnetic amorphous alloys.

[0004] Currently, there are numerous methods for detecting and evaluating the internal stress of alloys. For example, patent CN119224023A collects the X-ray diffraction spectrum of the test piece, uses the EMD algorithm to decompose the X-ray diffraction spectrum into several IMF components, and reconstructs the denoised X-ray diffraction spectrum using the IMF components in the category with the largest mean of the main peak description degree to achieve residual stress detection. However, there is very little research on the detection and evaluation of internal stress in amorphous ribbons. Traditionally, the methods used to detect and evaluate the internal stress of amorphous alloy ribbons mainly include the following categories: 1. X-ray diffraction (XRD) detection, that is, indirectly evaluating internal stress by analyzing the change in lattice spacing. However, for amorphous alloy materials, because they do not have a clear lattice structure, XRD is difficult to accurately measure internal stress. In addition, the XRD method requires expensive equipment and strict operating conditions. 1. The testing cycle is long, making it unsuitable for real-time testing on large-scale production lines. 2. Destructive testing methods such as blind hole method, contour method, or layer-by-layer method can also be used to assess the residual stress of materials. Although this method is intuitive, it requires destroying the sample structure. In addition, the thickness of amorphous alloy strips is generally only 20-30μm, which does not meet the minimum size requirements. 3. Photoelasticity method is suitable for thin film materials. It indirectly assesses the stress distribution by detecting the birefringence phenomenon when light is transmitted or reflected. However, this method is usually suitable for transparent or translucent materials, and is not suitable for amorphous alloy strips due to their metallic properties. 4. Pressure testing method can assess the internal stress of amorphous alloy strips to a certain extent. However, when the strip sample is folded along its length so that the two ends are in contact, it is easily affected by human factors, which affects the accuracy of the test results.

[0005] In summary, existing technologies all have problems in the detection of internal stress in amorphous alloys. For example, XRD, destructive testing, and photoelastic methods are not suitable for stress assessment of amorphous alloy strips. Moreover, most detection methods require expensive instruments and equipment, which increases the detection cost. At the same time, the detection cycle is long, which cannot meet the real-time and efficiency requirements of modern production lines.

[0006] Application content

[0007] The purpose of this application is to provide a method and apparatus for evaluating the internal stress of amorphous alloy strips, so as to solve the problems existing in the current methods for detecting the internal stress of amorphous alloys as described in the background art.

[0008] To achieve the above objectives, this application provides the following technical solution: a method for evaluating the internal stress of amorphous alloy strips, comprising:

[0009] Prepare strip-shaped strip samples;

[0010] Clamp one end of the strip sample along its length and drive the clamped strip sample to rotate around axis O for a set time.

[0011] Acquire sound data generated during the rotation of the strip sample, and evaluate the internal stress of the strip sample based on the sound data.

[0012] Furthermore, the axis O is set in a vertical direction, and the strip sample is in a vertically suspended state when it is clamped.

[0013] Furthermore, the length of the strip sample is 200–500 mm.

[0014] Furthermore, the width of the strip sample is 30–100 mm.

[0015] Furthermore, the thickness of the strip samples is 10–100 μm.

[0016] Furthermore, the sound data includes peak loudness and mean audio, and the magnitude of the internal stress of the strip sample is proportional to the peak loudness and mean audio.

[0017] Furthermore, the set time is 14 to 16 seconds.

[0018] Furthermore, the method also includes constructing a sound insulation zone, within which the rotation of the strip sample and the acquisition of sound data are all performed.

[0019] Another aspect of this application discloses a device for evaluating the internal stress of amorphous alloy strips, comprising:

[0020] A frame component, which defines an assembly area;

[0021] A rotary drive component is disposed within the assembly area and mounted on the frame component;

[0022] A clamping component is disposed within the assembly area and configured to clamp a strip-shaped material sample. The clamping component is connected to the output end of the rotary drive component, and the rotary drive component drives the clamping component holding the strip sample to rotate around the output shaft axis of the rotary drive component.

[0023] The acquisition unit is configured to acquire sound data generated by the rotation of the strip sample.

[0024] Furthermore, the output shaft axis of the rotary drive is arranged in the vertical direction.

[0025] Furthermore, the assembly area is a soundproof area.

[0026] Compared with the prior art, the beneficial effects of this application are:

[0027] By selecting strip-shaped material as the sample for testing, one end of the strip sample is fixed during the test, and periodic rotational excitation is applied to the sample in the clamped state to drive the sample to vibrate mechanically. The sound information generated during the sample vibration is detected by the acquisition component, thereby assessing the internal stress level of the strip. Furthermore, by comparing the acoustic characteristics of samples from different sources, the internal stress can be indirectly measured. It features simple operation, high efficiency, low cost, and reliable technology, and can effectively assess the internal stress level of amorphous alloy strips. Attached Figure Description

[0028] Figure 1 This is a flowchart of the method in this application;

[0029] Figure 2 This is a schematic diagram of the evaluation device;

[0030] Figure 3a and 3b This is a schematic diagram of the acoustic characteristic detection signal according to an embodiment of this application.

[0031] In the picture:

[0032] 100. Rotary drive component; 101. Acquisition component; 102. Fixture component; 103. Linkage component; 104. Crossbar component; 105. Strip sample; 106. Frame component. Detailed Implementation

[0033] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] During the rapid solidification process of amorphous alloy strips, the liquid metal cools rapidly to form an amorphous state. Due to the imbalance of atomic spacing or arrangement, as well as the difference in solidification rate between the surface and interior of the strip, internal stress is inevitably generated. The internal stress introduced during the strip preparation process not only causes unevenness of the strip surface, strip warping, and deterioration of the stacking coefficient, but also plays a major role in the anisotropy formed by the magnetoelastic coupling effect on the magnetic domain structure and its magnetization process, thus having a significant impact on the magnetic properties of the alloy.

[0035] Internal stress affects the mechanical properties of materials (such as stiffness, elastic modulus, and damping characteristics), thus altering the behavior of the strip during mechanical vibration. In amorphous strips, internal stress causes the atomic structure within the strip to be in different tensile or compressive states, which changes the material's stiffness and elastic modulus. Damping characteristics are the material's ability to dissipate energy during vibration, affecting the duration of vibration and the "crispness" of the sound. The damping characteristics of amorphous strips are also affected by internal stress. Specifically: when there is significant residual stress within the strip, the local elastic modulus increases, the stiffness also improves, and the damping characteristics become weaker. This means that when subjected to external force, the material's vibrational energy decays more slowly, the sound lasts longer, the sound is crisper, and the vibration frequency is higher. Strips with lower internal stress have relatively lower elastic modulus and stiffness, and stronger damping characteristics, leading to rapid dissipation of vibrational energy. These materials are more prone to deformation under external force, resulting in a relatively lower vibration frequency and a duller sound.

[0036] Based on the different sounds emitted by amorphous alloys under external force, referencing Figure 1 This application provides a method for evaluating the internal stress of amorphous alloy strips, comprising:

[0037] S100: Prepare strip-shaped strip samples;

[0038] S200: Clamp one end of the strip sample along its length and drive the clamped strip sample to rotate around axis O for a set time.

[0039] S300: Acquire sound data generated during the rotation of the strip sample and evaluate the internal stress of the strip sample based on the sound data.

[0040] In some embodiments, the amorphous alloy strip is made of Fe-based, Co-based, FeNi-based, FeCo-based, Ni-based, Al-based, Cu-based, Zr-based, or other amorphous alloys in the amorphous alloy system, and the amorphous alloy strip is rapidly solidified using high-speed planar continuous casting technology.

[0041] In some embodiments, the method further includes constructing a sound-insulating zone, wherein the rotation of the strip sample is performed within the sound-insulating zone.

[0042] In some embodiments, since the length of the strip sample affects the vibration amplitude during the strip sample test, when the strip sample length is too short, the vibration amplitude of the strip sample is too small and affects the acquisition of sound characteristics. Therefore, it is necessary to limit the minimum length of the strip sample. In some embodiments, the minimum length of the strip sample is 200mm. At the same time, considering the size limitation of the sound insulation zone, in order to avoid the strip sample colliding with the frame of the sound insulation zone during the test, the maximum length of the strip sample is 500mm.

[0043] In some embodiments, considering the acquisition of sound characteristics during the actual evaluation process, when the width of the strip sample is too narrow, the sound characteristics generated by the strip sample during the evaluation process are not obvious enough and are difficult to measure. When the width of the strip sample is too long, it will affect the vibration of the strip sample. At the same time, considering the limitations of the sound insulation range and the specifications of the subsequent fixtures, the width of the strip sample is 30 to 100 mm.

[0044] In some embodiments, in the selection of the thickness of the strip sample, thinner strips are more susceptible to the effects of rapid cooling, while thicker strips may form a larger internal stress gradient. In this application, the thickness of strip samples from different sources is kept consistent. For example, the thickness of the strip sample in this application can be 10 to 100 μm.

[0045] In some embodiments, the distance between the axis O and the strip sample is set such that the axis O does not intersect with the strip sample. In some examples, the axis O extends in the vertical direction, and the strip sample is in a vertically suspended state when it is clamped. That is, the rotation axis O of the strip sample and the strip sample are both set in the vertical direction during the test. In other words, during the test, the axis O and the length direction of the strip sample are set parallel to each other.

[0046] In some embodiments, considering the acquisition of sound data and the damage caused to the strip sample by the experiment, the rotation time of the strip sample in this application is set to 14 to 16 seconds.

[0047] In some embodiments, the acquired sound features include loudness peak and mean audio. For example, the higher the loudness peak and the larger the mean audio of the sound data during the strip sample test, the greater the internal stress present in the amorphous alloy strip.

[0048] Another aspect of this application discloses a device for evaluating the internal stress of amorphous alloy strips, referring to... Figure 2The evaluation device includes a frame component 106, a rotation drive component 100 (e.g., an automatic rotator), a clamp component 102, and a data acquisition component 101 (e.g., a sound level meter). The frame component 106 defines an assembly area. In some embodiments, the frame component 106 is configured as a closed shell, and the shell material is preferably made of sound-insulating material. Correspondingly, the assembly area is configured as a sound-insulating area to facilitate the acquisition of sound data during the rotation test. (Continuing to refer to...) Figure 2 The aforementioned rotary drive 100 and acquisition component 101 are both located within the assembly area, with the rotary drive 100 mounted on the frame component 106. The clamp component 102 is connected to the output end of the rotary section component and configured to clamp the strip sample 105. During testing, the clamp component 102 holding the strip sample 105 rotates around the axis O under the action of the rotary drive 100.

[0049] In some embodiments, the frame component 106 is a cuboid frame and includes a rectangular upper frame. A crossbar component 104 is provided inside the upper frame. The crossbar component 104 serves as the mounting carrier for the rotary drive component 100. In some examples, the two ends of the crossbar component 104 are fixed to the diagonal points of the upper frame, and the rotary drive component 100 is installed in the middle position of the crossbar component 104. In other examples, the two ends of the crossbar component 104 are connected to the midpoints of the two opposite sides of the upper frame. Correspondingly, the rotary drive component 100 is also installed in the middle position of the crossbar component 104. Based on this arrangement, the assembly area defined within the frame component can be fully utilized.

[0050] The output shaft axis of the aforementioned rotary drive 100 (i.e., the rotation axis O of the strip sample 105) is set in the vertical direction. Correspondingly, when the strip sample 105 is clamped by the clamping component 102, it is in a vertically suspended state. At the same time, the output end of the rotary drive 100 and the clamping component 102 are connected by the connecting rod component 103. That is, one end of the connecting rod component 103 is connected to the output end of the rotary drive 100, and the other end is connected to the clamping component 102. In some examples, the connecting rod component 103 is set in the horizontal direction.

[0051] The steps of the evaluation method are now explained by way of example, using the evaluation apparatus described above:

[0052] Step 1: Prepare a strip sample of the same length and width for measurement, with a length of 200-500 mm and a width of 30-100 mm;

[0053] Step 2: Measure the internal stress of the strip sample. Fix the strip sample to be tested on the automatic rotator using the clamping components. Start the automatic rotator and apply periodic rotational excitation. The rotator drives the strip sample to vibrate mechanically. At the same time, turn on the acquisition component to detect the sound data generated by the vibration of the strip sample. The internal stress of the strip sample is evaluated based on the sound data. For example, the higher the measured loudness peak and the larger the average sound frequency, the greater the internal stress in the strip sample.

[0054] Here are a case study of comparative testing of one or two samples:

[0055] The materials to be tested are amorphous alloy strips of grade 1K101 from different furnace batches, numbered L-1 and L-2 respectively. Generally, internal stress will cause difficulty in the movement of magnetic domain walls, thereby increasing hysteresis loss. In the magnetic performance test, the loss of L-1 is much higher than that of L-2. The amorphous alloy strips are prepared by rapid cooling using the single-roll melt spin quenching method commonly used in this field.

[0056] First, prepare the long strip alloy strip to be measured. Cut the two amorphous alloy strips into strip samples of the same size with a length of 300 mm and a width of 40 mm.

[0057] The two types of strip samples to be tested were placed in a suspended state using the clamping components. The automatic rotator 1 was started, and the acquisition component 4 was turned on simultaneously to test the sound characteristics generated by the vibration of the amorphous strip. The test time was approximately 15 seconds. Figure 3a As shown, the test results indicate that the peak loudness of the L-1 alloy strip is 76dB, and the average audio frequency is 7.5kHz; Figure 3b As shown, the peak loudness of the L-2 alloy strip is 70dB, and the average sound frequency is 7.1kHz.

[0058] The obtained acoustic data shows that the acoustic test results of strips with different internal stresses have significant differences, which correspond to the loss test results. Therefore, it can be used as a method to judge the internal stress, thereby enabling the evaluation of internal stress in amorphous alloy strips and can be applied to different amorphous alloy material systems.

[0059] This application utilizes the acoustic property differences caused by internal stress to assess internal stress, cleverly circumventing the difficulties of other methods due to the unique structural characteristics and size limitations of amorphous alloy strips. It also proposes a corresponding assessment method and a compatible assessment device, possessing significant advantages such as convenient implementation, high detection efficiency, low cost, strong controllability, good repeatability, and high technical reliability. This not only provides strong technical support and scientific basis for improving the preparation quality of amorphous alloy strips but also gives it broad application prospects and wide applicability in the field of internal stress evaluation of amorphous alloy strips.

[0060] In the description of this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the invention. In this invention, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, those skilled in the art can combine different embodiments or examples and features of different embodiments or examples described in this invention without contradiction.

[0061] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for evaluating the internal stress of amorphous alloy strips, characterized in that, include: Prepare strip-shaped strip samples; Clamp one end of the strip sample along its length and drive the clamped strip sample to rotate around axis O for a set time. Acquire sound data generated during the rotation of the strip sample, and evaluate the internal stress of the strip sample based on the sound data.

2. The method for evaluating the internal stress of amorphous alloy strip according to claim 1, characterized in that: The axis O is set in the vertical direction, and the strip sample is in a vertically suspended state when it is clamped.

3. The method for evaluating the internal stress of amorphous alloy strip according to claim 1, characterized in that: The length of the strip sample is 200-500 mm.

4. The method for evaluating the internal stress of amorphous alloy strip according to claim 1, characterized in that: The width of the strip samples is 30–100 mm.

5. The method for evaluating the internal stress of amorphous alloy strip according to claim 1, characterized in that: The thickness of the strip samples ranges from 10 to 100 μm.

6. The method for evaluating the internal stress of amorphous alloy strip according to claim 1, characterized in that: The sound data includes peak loudness and mean audio, and the internal stress of the strip sample is proportional to the peak loudness and mean audio.

7. The method for evaluating the internal stress of amorphous alloy strip according to claim 1, characterized in that: The set time is 14 to 16 seconds.

8. The method for evaluating the internal stress of amorphous alloy strip according to claim 1, characterized in that: The method also includes constructing a sound insulation zone, within which the rotation of the strip sample and the acquisition of sound data are performed.

9. A device for evaluating the internal stress of amorphous alloy strips, characterized in that, include: A frame component, which defines an assembly area; A rotary drive component is disposed within the assembly area and mounted on the frame component; A clamping component is disposed within the assembly area and configured to clamp a strip-shaped material sample. The clamping component is connected to the output end of the rotary drive component, and the rotary drive component drives the clamping component holding the strip sample to rotate around the output shaft axis of the rotary drive component. The acquisition unit is configured to acquire sound data generated by the rotation of the strip sample.

10. The device for evaluating the internal stress of amorphous alloy strip according to claim 9, characterized in that: The output shaft axis of the rotary drive is set in the vertical direction.

11. The device for evaluating the internal stress of amorphous alloy strip according to claim 9, characterized in that: The assembly area is a soundproof area.

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