A microscopic digital image detection method for titanium alloy thermal processing deformation

Abstract

The present invention relates to the field of image processing technology, and in particular to a method for detecting microscopic digital images of titanium alloy thermal processing deformation, comprising: obtaining the deformation degree of the titanium alloy sample plate under a specific macroscopic stress according to the deformation degree of the transverse core area of ​​the titanium alloy sample plate under a specific macroscopic stress, the deformation degree of each local microscopic image under a specific macroscopic stress under a longitudinal scan, and the total area of ​​all transverse core areas and all longitudinal core areas under a specific macroscopic stress; obtaining the deformation rate of the titanium alloy sample plate under the macroscopic stress according to the deformation degree of the titanium alloy sample plate under each macroscopic stress and the size and amount of the macroscopic stress; judging the quality of the titanium alloy material according to the deformation rate of the titanium alloy sample plate under the macroscopic stress. The present invention improves the accuracy of titanium alloy thermal material detection.

Description

Technical Field

[0001] The present application relates to the technical field of image processing, and in particular to a method for detecting microscopic digital images of thermal processing deformation of titanium alloys. Background Art

[0002] Heat strengthened titanium alloy is a Type titanium alloys and heat-resistant titanium alloys have good hot processing properties and can be welded and machined in various ways. However, due to the narrow temperature range of thermal deformation and large deformation resistance of titanium alloy materials, the flow stress of the alloy during deformation is sensitive to process parameters such as temperature and strain rate, which can easily cause uneven deformation. Therefore, the deformation quality detection of titanium alloys is crucial for finished products. The commonly used standard for deformation quality detection of titanium alloy materials during hot processing is to judge by measuring the relationship between deformation elongation and stress magnitude. This method is not accurate enough for expressing the microscopic deformation of titanium alloys. When a small deformation occurs, the internal deformation of the material is easily ignored by the elongation, resulting in inaccurate quality detection under smaller macroscopic stresses. Summary of the invention

[0003] The present invention provides a method for detecting microscopic digital images of titanium alloy thermal processing deformation, so as to solve the problem that the microscopic deformation expression of titanium alloy is not accurate enough. When a small deformation occurs, the deformation inside the material is easily ignored by means of elongation, resulting in inaccurate quality detection under small macroscopic stress.

[0004] A microscopic digital image detection method for titanium alloy thermal processing deformation of the present invention adopts the following technical scheme:

[0005] An embodiment of the present invention provides a method for detecting microscopic digital images of titanium alloy thermal processing deformation, the method comprising the following steps:

[0006] Several local microscopic images of the same type of titanium alloy sample plates without macroscopic stress and with different macroscopic stresses under transverse scanning and longitudinal scanning, as well as the local microscopic images of each local microscopic image were obtained. Harmony Mutually;

[0007] Any macro stress is recorded as specific macro stress;

[0008] According to the local microscopic images of titanium alloy specimens without macro stress and with specific macro stress applied Harmony The difference in phases is used to obtain the deformation degree of each local microscopic image of the titanium alloy sample plate under a specific macroscopic stress;

[0009] According to the deformation degree of each local microscopic image of the titanium alloy sample plate under the specific macroscopic stress, the transverse core area and the longitudinal core area of ​​the titanium alloy sample plate under the specific macroscopic stress are screened out from the local microscopic images; according to the local microscopic images of the transverse scanning and the longitudinal scanning of the titanium alloy sample plate under the specific macroscopic stress and the transverse core area and the longitudinal core area of ​​the titanium alloy sample plate under the specific macroscopic stress, the total area of ​​all the transverse core areas and all the longitudinal core areas of the titanium alloy sample plate under the specific macroscopic stress is obtained;

[0010] According to the deformation degree of the transverse core area of ​​the titanium alloy sample plate under the specific macro-stress, the deformation degree of each local microscopic image under the specific macro-stress under the longitudinal scanning, and the total area of ​​all transverse core areas and all longitudinal core areas under the specific macro-stress, the deformation degree of the titanium alloy sample plate under the specific macro-stress is obtained; according to the deformation degree of the titanium alloy sample plate under each macro-stress and the size and amount of the macro-stress, the deformation rate of the titanium alloy sample plate under the macro-stress is obtained;

[0011] The quality of titanium alloy materials can be judged based on the deformation rate of titanium alloy sample plates under macroscopic stress.

[0012] Preferably, the local microscopic images of the titanium alloy sample plates without macroscopic stress and with specific macroscopic stress applied are Harmony The difference in phases is used to obtain the deformation degree of each local microscopic image of the titanium alloy sample plate under a specific macroscopic stress, and the specific steps are as follows:

[0013] The canny edge detection algorithm is used to extract Harmony The contour of each local microscopic image is obtained Harmony The length of each contour line of the phase;

[0014] According to the local microscopic images of titanium alloy specimens without macro stress and with specific macro stress applied Harmony The length of each contour line and the number of pixels of the phase are calculated to obtain the deformation degree of each local microscopic image of the titanium alloy sample plate under a specific macroscopic stress.

[0015] Preferably, the local microscopic images of the titanium alloy sample plates without macroscopic stress and with specific macroscopic stress applied are Harmony The length of each contour line and the number of pixels of the phase are used to obtain the deformation degree of each local microscopic image of the titanium alloy sample plate under a specific macroscopic stress, including the specific formula as follows:

[0016]

[0017] In the formula, The titanium alloy sample plate The degree of deformation of a local microscopic image under a specific macroscopic stress; The titanium alloy sample plate A local microscopic image is formed under a specific macroscopic stress. The number of pixels of the phase; The titanium alloy sample plate A local microscopic image without macroscopic stress The number of pixels of the phase; The titanium alloy sample plate A local microscopic image is formed under a specific macroscopic stress. Average contour length of the phase; The titanium alloy sample plate A local microscopic image without macroscopic stress Average contour length of the phase; The titanium alloy sample plate A local microscopic image is formed under a specific macroscopic stress. The number of pixels of the phase; The titanium alloy sample plate A local microscopic image without macroscopic stress The number of pixels of the phase; is an exponential function with a natural constant as base; is the absolute value function; is the normalization function.

[0018] Preferably, the method of screening out the transverse core region and the longitudinal core region of the titanium alloy sample plate under the specific macro stress from the local micro image according to the deformation degree of each local micro image of the titanium alloy sample plate under the specific macro stress comprises the following specific steps:

[0019] When the deformation degree of any local microscopic image of the titanium alloy sample plate under the transverse scanning under a specific macroscopic stress is greater than the preset deformation threshold When , it is recorded as the transverse core area of ​​the titanium alloy specimen plate under a specific macro stress;

[0020] When the deformation degree of any local microscopic image of the titanium alloy sample plate under the longitudinal scanning under a specific macroscopic stress is greater than the preset deformation threshold When , it is recorded as the longitudinal core area of ​​the titanium alloy specimen plate under specific macro stress.

[0021] Preferably, the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy sample plate under the specific macro stress is obtained according to the local microscopic images of the transverse scanning and the longitudinal scanning of the titanium alloy sample plate under the specific macro stress and the transverse core area and the longitudinal core area of ​​the titanium alloy sample plate under the specific macro stress, and the specific steps include:

[0022] The ratio of the number of core areas in the transverse direction of the titanium alloy sample plate under a specific macro stress to the number of local microscopic images of the titanium alloy sample plate scanned transversely under the specific macro stress is recorded as the core area length value in the transverse direction of the titanium alloy sample plate under the specific macro stress;

[0023] The ratio of the number of core areas in the longitudinal direction of the titanium alloy sample plate under a specific macro stress to the number of local microscopic images of the titanium alloy sample plate scanned longitudinally under the specific macro stress is recorded as the core area length value in the longitudinal direction of the titanium alloy sample plate under the specific macro stress;

[0024] According to the length values ​​of the transverse core area and the longitudinal core area of ​​the titanium alloy sample plate under specific macro-stress, the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy sample plate under specific macro-stress is obtained.

[0025] Preferably, the method of obtaining the total area of ​​all transverse core regions and all longitudinal core regions of the titanium alloy sample plate under a specific macro-stress according to the transverse core region length value and the longitudinal core region length value of the titanium alloy sample plate under a specific macro-stress comprises the following specific steps:

[0026] The product of the transverse core area length value and the longitudinal core area length value of the titanium alloy sample plate under the specific macro stress is recorded as the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy sample plate under the specific macro stress.

[0027] Preferably, the step of obtaining the deformation degree of the titanium alloy sample plate under a specific macro-stress according to the deformation degree of the transverse core area of ​​the titanium alloy sample plate under a specific macro-stress, the deformation degree of each local microscopic image under a specific macro-stress under a longitudinal scan, and the total area of ​​all transverse core areas and all longitudinal core areas under a specific macro-stress comprises the following specific steps:

[0028] The sum of the average value of the deformation degree of all transverse core areas of the titanium alloy sample plate under a specific macro stress and the difference between the maximum value and the minimum value of the deformation degree of all local micro images of the titanium alloy sample plate under a longitudinal scan under a specific macro stress is recorded as the total deformation degree of the titanium alloy sample plate under a specific macro stress;

[0029] According to the total deformation degree of the titanium alloy sample plate under the specific macro-stress and the total area of ​​all transverse core regions and all longitudinal core regions under the specific macro-stress, the deformation degree of the titanium alloy sample plate under the specific macro-stress is obtained.

[0030] Preferably, the step of obtaining the deformation degree of the titanium alloy sample plate under a specific macro-stress according to the total deformation degree of the titanium alloy sample plate under a specific macro-stress and the total area of ​​all transverse core regions and all longitudinal core regions under a specific macro-stress comprises the following specific steps:

[0031] The product of the total deformation degree of the titanium alloy sample plate under specific macro-stress and the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy sample plate under specific macro-stress is recorded as the deformation degree of the titanium alloy sample plate under specific macro-stress.

[0032] Preferably, the deformation rate of the titanium alloy sample plate under macro stress is obtained according to the deformation degree of the titanium alloy sample plate under each macro stress and the size and amount of the macro stress, including the specific formula as follows:

[0033]

[0034] In the formula, It represents the deformation rate of titanium alloy specimen plate under macroscopic stress; represents the number of different macro stresses applied to the titanium alloy specimen plate; Indicates that the titanium alloy sample plate is The degree of deformation under a macroscopic stress; Indicates that the titanium alloy sample plate is The degree of deformation under a macroscopic stress; Indicates The magnitude of the macroscopic stress; Indicates The magnitude of the macroscopic stress.

[0035] Preferably, judging the quality of the titanium alloy material according to the deformation rate of the titanium alloy sample plate under macroscopic stress comprises the following specific steps:

[0036] The deformation rate of the titanium alloy sample plate under macroscopic stress is normalized to obtain the final deformation rate of the titanium alloy sample plate under macroscopic stress;

[0037] When the final deformation rate of the titanium alloy specimen under macroscopic stress is less than the preset threshold , judging that the quality of titanium alloy material is the best;

[0038] When the final deformation rate of the titanium alloy specimen under macroscopic stress is greater than or equal to the preset threshold and is less than or equal to the preset threshold When the titanium alloy material is judged to be of good quality;

[0039] When the final deformation rate of the titanium alloy specimen under macroscopic stress is greater than the preset threshold and is less than or equal to the preset threshold When the quality of titanium alloy material is judged to be average;

[0040] When the final deformation rate of the titanium alloy specimen under macroscopic stress is greater than the preset threshold , judging that the quality of titanium alloy material is not good.

[0041] The beneficial effects of the technical solution of the present invention are: the digital image of the titanium alloy sample material is segmented according to the semantic network, and then the segmented image is digitally analyzed to obtain the deformation of the sample material, and finally the deformation rate of the material is obtained in combination with the applied stress, which can accurately express the microscopic deformation. According to the deformation degree of the transverse core area of ​​the titanium alloy sample plate under a specific macroscopic stress, the deformation degree of each local microscopic image under a specific macroscopic stress under a longitudinal scan, and the total area of ​​all transverse core areas and all longitudinal core areas under a specific macroscopic stress, the deformation degree of the titanium alloy sample plate under a specific macroscopic stress is obtained; according to the deformation degree of the titanium alloy sample plate under each macroscopic stress and the size and amount of the macroscopic stress, the deformation rate of the titanium alloy sample plate under macroscopic stress is obtained; the deformation of the titanium alloy sample plate can be accurately judged; according to the deformation rate of the titanium alloy sample plate under macroscopic stress, the quality of the titanium alloy material can be judged. By setting a threshold to judge whether the quality standard is met, the accuracy of titanium alloy deformation quality detection is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0043] Figure 1 This is a flow chart of the steps of a method for detecting microscopic digital images of titanium alloy thermal processing deformation according to the present invention;

[0044] Figure 2 A schematic diagram of the scanning direction of a titanium alloy sample plate provided in this embodiment;

[0045] Figure 3 A microscopic digital image of a titanium alloy sample plate without macro stress and with macro stress applied provided in this embodiment;

[0046] Figure 4 A schematic diagram of the deformation degree of the core area of ​​a local microscopic image of a titanium alloy sample plate provided in this embodiment. DETAILED DESCRIPTION

[0047] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following is a detailed description of the specific implementation method, structure, characteristics and effects of a titanium alloy hot working deformation microscopic digital image detection method proposed by the present invention in combination with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0048] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0049] The specific scheme of the method for detecting microscopic digital image of titanium alloy thermal processing deformation provided by the present invention is described in detail below with reference to the accompanying drawings.

[0050] See also Figure 1 , which shows a flow chart of the steps of a method for detecting microscopic digital images of titanium alloy thermal processing deformation provided by an embodiment of the present invention, the method comprising the following steps:

[0051] Step S001: Obtaining a plurality of local microscopic images of the same type of titanium alloy sample plate without macroscopic stress and with different macroscopic stress under transverse scanning and longitudinal scanning, and the local microscopic images of each local microscopic image. Harmony Mutually.

[0052] It should be noted that the Ti-6Al-4V titanium alloy sheet is used to The samples were heated to different set temperatures (greater than 900 degrees Celsius) at a speed of 10 °C, then kept at this temperature for 60 minutes, and then cooled to room temperature. The samples were heated to 550 degrees Celsius at a rate of 1 second and kept at that temperature for 300 minutes, and finally cooled to room temperature by air cooling. In order to obtain the surface microscopic image, the samples were cut, ground and polished to eliminate the influence of scratches.

[0053] Then, according to the needs of subsequent hot processing, the titanium alloy plate is heated to a constant temperature, different stable macroscopic stresses are applied to the sample, and then it is cooled to room temperature and observed using an electron microscope. The direction of observation is to scan the rows and columns in the middle of the titanium alloy sample plate horizontally and vertically respectively through an electron microscope. The schematic diagram of the scanning direction of the titanium alloy sample plate is shown in the figure. Figure 2 As shown, Figure 2 The electron microscope probe is used to scan the titanium alloy plate sample in both horizontal and vertical scanning directions. In order to improve the scanning process, only horizontal and vertical scanning is performed, and the step length of each movement is determined according to the size of the electron microscope and the sample material to ensure that the positions of each scan in each direction are adjacent but not repeated.

[0054] Several local microscopic images of the same type of titanium alloy sample plates without macro stress and with different macro stresses applied under transverse scanning and longitudinal scanning are obtained;

[0055] It should be noted that since the microscope cannot display the entire titanium alloy sample plate when taking images, only a part of it can be displayed, so each titanium alloy microscopic image is represented by several local images of the titanium alloy sample plate. The same type of titanium alloy sample plates with different macro stresses are analyzed, and the unit of macro stress is Pascal; the different macro stress data sequences are represented as {5Pa, 10Pa, 15Pa, 20Pa, 25Pa, 30Pa, 35Pa, 40Pa, 45Pa, 50Pa}, which is used as an example for description.

[0056] What needs to be explained is that the semantic network is designed for microscopic digital image segmentation. Harmony Phase segmentation, the network architecture is CNN neural network, the input is microscopic digital image, the output is binary digital image, the microscopic digital images of titanium alloy sample plates without macroscopic stress and with macroscopic stress are shown in Figure 3 As shown, it is The left image is a picture of the titanium alloy sample plate with macroscopic stress applied, and the right image is a picture of the titanium alloy sample plate without macroscopic stress applied. Phase is represented as black area, The phase is represented by the white area; the training set is a manually labeled binary image, and the loss function is the mean square error function.

[0057] The CNN neural network was used to segment several local microscopic images of the same type of titanium alloy sample plates without macroscopic stress and with different macroscopic stress under transverse scanning and longitudinal scanning, and the local microscopic images of each local microscopic image were obtained. Harmony Mutually;

[0058] Among them, CNN neural network is a well-known technology, and the specific method will not be introduced here.

[0059] It should be noted that each local microscopic image of the titanium alloy sample plate Phase is a crystal structure in titanium alloys, with a densely packed hexagonal closest packing structure. The characteristics of the phase include good plasticity, toughness and corrosion resistance; Phase is another crystal structure in titanium alloys, with a body-centered cubic close-packed structure. The phase has higher strength and heat resistance and is suitable for use at higher temperatures.

[0060] Step S002: Record any macro stress as a specific macro stress; and Harmony The difference in phases was calculated to obtain the deformation degree of each local microscopic image of the titanium alloy sample plate under a specific macroscopic stress.

[0061] It should be noted that when titanium alloy is hot-worked, the grains deform unevenly along the tensile direction and other directions, that is, the deformation of most positions inside the titanium alloy is relatively small, and some positions do not even deform. Generally, the initial position of deformation is in the middle of the titanium alloy part, and The greater the deformation degree of the phase, the smaller the number of phases that appear, and the corresponding transformation The more phases there are; and the remaining The contour in the phase gradually changes from an initial circle to a needle shape.

[0062] What needs to be explained is that the binary image and the contour image are obtained, and then the The average length of the phase contour and Mutually, The number of pixels in the phase. Estimated changes in phase contours The change of phase shape, when the average contour line gradually lengthens, it means The phase gradually changes into a needle shape.

[0063] Any macro stress is recorded as specific macro stress.

[0064] The canny edge detection algorithm is used to extract Harmony The contour of the phase is determined by calculating the connection path of the pixel points to obtain the contour of each local microscopic image. Harmony The length of each contour line of the phase;

[0065] Among them, canny edge detection is a well-known technology, and the specific method will not be introduced here.

[0066] Titanium alloy sample plate The calculation method of the deformation degree of a local microscopic image under a specific macroscopic stress is as follows:

[0067]

[0068] In the formula, The titanium alloy sample plate The degree of deformation of a local microscopic image under a specific macroscopic stress; The titanium alloy sample plate A local microscopic image is formed under a specific macroscopic stress. The number of pixels of the phase; The titanium alloy sample plate A local microscopic image without macroscopic stress The number of pixels of the phase; The titanium alloy sample plate A local microscopic image is formed under a specific macroscopic stress. Average contour length of the phase; The titanium alloy sample plate A local microscopic image without macroscopic stress Average contour length of the phase; The titanium alloy sample plate A local microscopic image is formed under a specific macroscopic stress. The number of pixels of the phase; The titanium alloy sample plate A local microscopic image without macroscopic stress The number of pixels of the phase; is an exponential function with a natural constant as base; is the absolute value function; is the normalization function.

[0069] What needs to be explained is that when the denominator in the formula is 0, set the denominator to 1 and use this as an example to ensure that the formula is valid.

[0070] What needs to be explained is that The titanium alloy sample plate A local microscopic image exerts macroscopic stress Phase, relative to the phase without macro stress The degree of phase reduction, the more it changes, the greater the stress, and the more serious the deformation; After applying macro stress The difference between the average contour length of the phase and the average contour length without macro stress, indicates that the greater the macro stress, the higher the degree of deformation; express The greater the expansion of the phase, the greater the degree of deformation.

[0071] Step S003: According to the deformation degree of each local microscopic image of the titanium alloy sample plate under the specific macroscopic stress, the transverse core area and the longitudinal core area of ​​the titanium alloy sample plate under the specific macroscopic stress are screened out from the local microscopic images; according to the local microscopic images of the transverse scanning and the longitudinal scanning of the titanium alloy sample plate under the specific macroscopic stress and the transverse core area and the longitudinal core area of ​​the titanium alloy sample plate under the specific macroscopic stress, the total area of ​​all the transverse core areas and all the longitudinal core areas of the titanium alloy sample plate under the specific macroscopic stress is obtained.

[0072] It should be noted that, in addition, since the deformed part inside the titanium alloy material has a certain continuity, that is, there is a shallow deformation around the position where the core deformation occurs, and the degree of deformation increases as it moves closer to the core. Therefore, during the gradual movement of the microscope, if the deformation degree calculated above is increasing, it means that it is gradually approaching the core position of the deformation; otherwise, it means that it is gradually moving away from the deformation core. Furthermore, if the deformation area of ​​the core region is larger, the process of increasing and decreasing the deformation degree will be shorter when scanning the sample horizontally and vertically, and the deformation degree fluctuation in the middle part will be more serious.

[0073] It is further necessary to explain that the deformation degrees corresponding to the horizontal and vertical image sequences are arranged in the order in which the images are generated, starting with the deformation degree corresponding to the initial image. When the deformation degree begins to fluctuate, it means that the core deformation area has been entered. The starting point is when the deformation degree begins to decrease, and when there are five consecutive decreases, it is the end point of the fluctuation. The distance between the starting point and the end point is the core deformation area. The schematic diagram of the deformation degree of the core area of ​​the local microscopic image of the titanium alloy sample plate is shown in the figure. Figure 4 As shown, Figure 4 The horizontal axis is the lateral displacement, and the vertical axis is the degree of deformation. The middle part of the curve corresponds to the core deformation area of ​​the titanium alloy sample plate; it shows the change in the degree of lateral deformation. The horizontal axis in the figure represents the lateral displacement starting from one side and gradually moving away; the vertical axis represents the degree of deformation of each local microscopic image. The longitudinal irradiation of the electron microscope is similar to the transverse irradiation, so it will not be repeated here. The area of ​​the core deformation of the plate is judged by these local images.

[0074] Preset deformation threshold The value is 0.6, and this example is used for description.

[0075] When the deformation degree of any local microscopic image of the titanium alloy sample plate under the transverse scanning under a specific macroscopic stress is greater than the preset deformation threshold When , it is recorded as the transverse core area of ​​the titanium alloy specimen plate under a specific macro stress;

[0076] When the deformation degree of any local microscopic image of the titanium alloy sample plate under the longitudinal scanning under a specific macroscopic stress is greater than the preset deformation threshold When , it is recorded as the longitudinal core area of ​​the titanium alloy specimen plate under a specific macro stress;

[0077] The ratio of the number of core areas in the transverse direction of the titanium alloy sample plate under a specific macro stress to the number of local microscopic images of the titanium alloy sample plate scanned transversely under the specific macro stress is recorded as the core area length value in the transverse direction of the titanium alloy sample plate under the specific macro stress;

[0078] The ratio of the number of core areas in the longitudinal direction of the titanium alloy sample plate under a specific macro stress to the number of local microscopic images of the titanium alloy sample plate scanned longitudinally under the specific macro stress is recorded as the core area length value in the longitudinal direction of the titanium alloy sample plate under the specific macro stress;

[0079] The product of the length of the core area in the transverse direction and the length of the core area in the longitudinal direction of the titanium alloy sample plate under the specific macro stress is recorded as the total area of ​​all the core areas in the transverse direction and all the core areas in the longitudinal direction of the titanium alloy sample plate under the specific macro stress;

[0080] Therefore, the calculation method for the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy specimen plate under specific macro stress is as follows:

[0081]

[0082] In the formula, It represents the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy specimen plate under specific macro stress; It represents the number of local microscopic images of the titanium alloy specimen plate scanned transversely under a specific macroscopic stress; It represents the number of local microscopic images of the titanium alloy specimen plate scanned longitudinally under a specific macroscopic stress; It represents the number of core areas in the transverse direction of the titanium alloy specimen plate under a specific macro stress; It indicates the number of core areas in the longitudinal direction of the titanium alloy specimen plate under a specific macro stress; is the length of the core area in the transverse direction of the titanium alloy specimen plate under specific macro stress; It is the core area length value in the longitudinal direction of the titanium alloy sample plate under specific macro stress.

[0083] It should be noted that represents the length of the core deformation area in the lateral direction; represents the length of the core deformation area in the longitudinal direction, It represents the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy specimen plate under specific macro stress.

[0084] At this point, the total area of ​​all transverse core regions and all longitudinal core regions of the titanium alloy sample plate under specific macro stress is obtained.

[0085] Step S004: According to the deformation degree of the transverse core area of ​​the titanium alloy sample plate under the specific macro-stress, the deformation degree of each local microscopic image under the specific macro-stress under the longitudinal scanning, and the total area of ​​all transverse core areas and all longitudinal core areas under the specific macro-stress, the deformation degree of the titanium alloy sample plate under the specific macro-stress is obtained; according to the deformation degree of the titanium alloy sample plate under each macro-stress and the size and amount of the macro-stress, the deformation rate of the titanium alloy sample plate under the macro-stress is obtained.

[0086] It should be noted that the deformation degree of the sample under this macro stress is calculated based on the deformation degree sequence of multiple local images. Since the deformation of the core area is larger and the rest is generally smaller, the deformation degree of the core part is used to represent the deformation degree of the entire sample. Using the mean deformation degree of the image of the transverse core area, the deformation degree of the central part is deduced according to the longitudinal increasing trend, and then multiplied by the area of ​​the core area, the deformation of the titanium alloy material can be obtained. Among them, the stress magnitude between the phase anisotropies is ignored, and it is believed that the stress between phases is a relatively uniform change.

[0087] The sum of the average value of the deformation degree of all transverse core areas of the titanium alloy sample plate under a specific macro stress and the difference between the maximum value and the minimum value of the deformation degree of all local micro images of the titanium alloy sample plate under a longitudinal scan under a specific macro stress is recorded as the total deformation degree of the titanium alloy sample plate under a specific macro stress;

[0088] The product of the total deformation degree of the titanium alloy sample plate under the specific macro stress and the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy sample plate under the specific macro stress is recorded as the deformation degree of the titanium alloy sample plate under the specific macro stress;

[0089] The calculation method of the deformation degree of titanium alloy specimen under specific macro stress is as follows:

[0090]

[0091] In the formula, Indicates the deformation degree of titanium alloy specimen plate under specific macro stress; It represents the average value of the deformation degree of all transverse core areas of the titanium alloy specimen plate under a specific macro stress; It represents the difference between the maximum value and the minimum value of the deformation degree of all local microscopic images of the titanium alloy specimen plate under longitudinal scanning under a specific macroscopic stress; It represents the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy specimen plate under specific macro stress; It is the total deformation degree of the titanium alloy sample plate under specific macro stress.

[0092] According to the above method, the deformation degree of the titanium alloy sample plate under each macro stress is obtained.

[0093] What needs to be explained is that It reflects the amplitude of the increasing deformation of the core area and the initial deformation of the edge in the vertical direction; It indicates the deformation degree of the central area of ​​the specimen plate, that is, the sum of the deformation degree of the transverse center and the amplitude of the longitudinal increase; It represents the overall material deformation of the titanium alloy specimen plate under specific macro stress, obtained through transverse and longitudinal image sequences.

[0094] It should be noted that the performance judgment index is constructed based on the deformation of the sample and the magnitude of the applied stress. Generally, as the externally applied macroscopic stress increases, the titanium alloy is subjected to greater force, and thus the deformation is greater. Generally, titanium alloy materials need to work in a high-intensity environment, and their deformation rate has higher requirements. In order to analyze whether the deformation effect of titanium alloy materials meets the corresponding standards, it is necessary to calculate the deformation and deformation rate of external stress.

[0095] The calculation method of the deformation rate of titanium alloy specimen under macro stress is as follows:

[0096]

[0097] In the formula, It represents the deformation rate of titanium alloy specimen plate under macroscopic stress; represents the number of different macro stresses applied to the titanium alloy specimen plate; Indicates that the titanium alloy sample plate is The degree of deformation under a macroscopic stress; Indicates that the titanium alloy sample plate is The degree of deformation under a macroscopic stress; Indicates The magnitude of the macroscopic stress; Indicates The magnitude of the macroscopic stress.

[0098] What needs to be explained is that It indicates the sensitivity of deformation to macroscopic stress. The smaller the value is, the better the titanium alloy material can adapt to high-intensity working environment.

[0099] What needs to be explained is that when the denominator in the formula is 0, set the denominator to 1 and use this as an example to ensure that the formula is valid.

[0100] At this point, the deformation rate of the titanium alloy sample plate under macroscopic stress is obtained.

[0101] Step S005: judging the quality of the titanium alloy material according to the deformation rate of the titanium alloy sample plate under macroscopic stress.

[0102] It should be noted that, according to the above-mentioned titanium alloy material performance indicators under small macroscopic stress conditions, the performance threshold sequence is set according to actual needs. If the experimental result is less than the threshold, it means that the material performance of the titanium alloy is better and meets the needs; otherwise, it means that the material performance of the titanium alloy needs to be improved. Therefore, when it is in different threshold intervals, it means that the batch of materials is in different quality levels, and the smaller the interval, the better the quality.

[0103] The deformation rate of the titanium alloy sample plate under macroscopic stress is normalized to obtain the final deformation rate of the titanium alloy sample plate under macroscopic stress; the normalization is performed using the maximum and minimum norm method, which is a well-known technology.

[0104] Preset Threshold The preset threshold is 0.1. The preset threshold is 0.5. is 0.8;

[0105] When the final deformation rate of the titanium alloy specimen under macroscopic stress is less than the preset threshold When the quality of titanium alloy material is judged to be the best;

[0106] When the final deformation rate of the titanium alloy specimen under macroscopic stress is greater than or equal to the preset threshold and is less than or equal to the preset threshold When the titanium alloy material is judged to be of good quality;

[0107] When the final deformation rate of the titanium alloy specimen under macroscopic stress is greater than the preset threshold and is less than or equal to the preset threshold When the quality of titanium alloy material is judged to be average;

[0108] When the final deformation rate of the titanium alloy specimen under macroscopic stress is greater than the preset threshold , judging that the quality of titanium alloy material is not good.

[0109] It should be noted that: in this embodiment, when the denominator in the formula is 0, the denominator is set to 1 to ensure that the formula is valid, and this example is used for description.

[0110] At this point, this embodiment is completed.

[0111] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for detecting microscopic digital images of titanium alloy thermal processing deformation, characterized in that: The method comprises the following steps: Several local microscopic images of the same type of titanium alloy sample plates without macroscopic stress and with different macroscopic stresses under transverse scanning and longitudinal scanning, as well as the local microscopic images of each local microscopic image were obtained. Harmony Mutually; Any macro stress is recorded as specific macro stress; According to the local microscopic images of titanium alloy specimens without macro stress and with specific macro stress applied Harmony The difference in phases is used to obtain the deformation degree of each local microscopic image of the titanium alloy sample plate under a specific macroscopic stress; According to the deformation degree of each local microscopic image of the titanium alloy sample plate under the specific macroscopic stress, the transverse core area and the longitudinal core area of ​​the titanium alloy sample plate under the specific macroscopic stress are screened out from the local microscopic images; according to the local microscopic images of the transverse scanning and the longitudinal scanning of the titanium alloy sample plate under the specific macroscopic stress and the transverse core area and the longitudinal core area of ​​the titanium alloy sample plate under the specific macroscopic stress, the total area of ​​all the transverse core areas and all the longitudinal core areas of the titanium alloy sample plate under the specific macroscopic stress is obtained; According to the deformation degree of the transverse core area of ​​the titanium alloy sample plate under the specific macro-stress, the deformation degree of each local microscopic image under the specific macro-stress under the longitudinal scanning, and the total area of ​​all transverse core areas and all longitudinal core areas under the specific macro-stress, the deformation degree of the titanium alloy sample plate under the specific macro-stress is obtained; according to the deformation degree of the titanium alloy sample plate under each macro-stress and the size and amount of the macro-stress, the deformation rate of the titanium alloy sample plate under the macro-stress is obtained; The quality of titanium alloy materials can be judged based on the deformation rate of titanium alloy sample plates under macroscopic stress; The method of screening out the transverse core region and the longitudinal core region of the titanium alloy sample plate under the specific macro stress from the local micro image according to the deformation degree of each local micro image of the titanium alloy sample plate under the specific macro stress comprises the following specific steps: When the deformation degree of any local microscopic image of the titanium alloy sample plate under the transverse scanning under a specific macroscopic stress is greater than the preset deformation threshold When , it is recorded as the transverse core area of ​​the titanium alloy specimen plate under a specific macro stress; When the deformation degree of any local microscopic image of the titanium alloy sample plate under the longitudinal scanning under a specific macroscopic stress is greater than the preset deformation threshold When , it is recorded as the longitudinal core area of ​​the titanium alloy specimen plate under a specific macro stress; According to the deformation degree of the titanium alloy sample plate under each macro stress and the magnitude and amount of the macro stress, the deformation rate of the titanium alloy sample plate under the macro stress is obtained, and the specific formula included is as follows: In the formula, It represents the deformation rate of titanium alloy specimen plate under macroscopic stress; represents the number of different macro stresses applied to the titanium alloy specimen plate; Indicates that the titanium alloy sample plate is The degree of deformation under a macroscopic stress; Indicates that the titanium alloy sample plate is The degree of deformation under a macroscopic stress; Indicates The magnitude of the macroscopic stress; Indicates The magnitude of the macroscopic stress.

2. According to claim 1, a method for detecting microscopic digital images of titanium alloy thermal processing deformation, characterized in that: The local microscopic images of the titanium alloy sample plates without macro stress and with specific macro stress applied are described Harmony The difference in phases is used to obtain the deformation degree of each local microscopic image of the titanium alloy sample plate under a specific macroscopic stress, and the specific steps are as follows: The canny edge detection algorithm is used to extract Harmony The contour of each local microscopic image is obtained Harmony The length of each contour line of the phase; According to the local microscopic images of titanium alloy specimens without macro stress and with specific macro stress applied Harmony The length of each contour line and the number of pixels of the phase are calculated to obtain the deformation degree of each local microscopic image of the titanium alloy sample plate under a specific macroscopic stress.

3. According to claim 2, a method for detecting microscopic digital images of titanium alloy thermal processing deformation, characterized in that: The local microscopic images of the titanium alloy sample plates without macro stress and with specific macro stress applied are described Harmony The length of each contour line and the number of pixels of the phase are used to obtain the deformation degree of each local microscopic image of the titanium alloy sample plate under a specific macroscopic stress, including the specific formula as follows: In the formula, The titanium alloy sample plate The degree of deformation of a local microscopic image under a specific macroscopic stress; The titanium alloy sample plate A local microscopic image is formed under a specific macroscopic stress. The number of pixels of the phase; The titanium alloy sample plate A local microscopic image without macroscopic stress The number of pixels of the phase; The titanium alloy sample plate A local microscopic image is formed under a specific macroscopic stress. Average contour length of the phase; The titanium alloy sample plate A local microscopic image without macroscopic stress Average contour length of the phase; The titanium alloy sample plate A local microscopic image is formed under a specific macroscopic stress. The number of pixels of the phase; The titanium alloy sample plate A local microscopic image without macroscopic stress The number of pixels of the phase; is an exponential function with a natural constant as base; is the absolute value function; is the normalization function.

4. According to claim 1, a method for detecting microscopic digital images of titanium alloy thermal processing deformation, characterized in that: The method of obtaining the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy sample plate under the specific macro stress according to the local microscopic images of the transverse scanning and the longitudinal scanning of the titanium alloy sample plate under the specific macro stress and the transverse core area and the longitudinal core area of ​​the titanium alloy sample plate under the specific macro stress comprises the following specific steps: The ratio of the number of core areas in the transverse direction of the titanium alloy sample plate under a specific macro stress to the number of local microscopic images of the titanium alloy sample plate scanned transversely under the specific macro stress is recorded as the core area length value in the transverse direction of the titanium alloy sample plate under the specific macro stress; The ratio of the number of core areas in the longitudinal direction of the titanium alloy sample plate under a specific macro stress to the number of local microscopic images of the titanium alloy sample plate scanned longitudinally under the specific macro stress is recorded as the core area length value in the longitudinal direction of the titanium alloy sample plate under the specific macro stress; According to the length values ​​of the transverse core area and the longitudinal core area of ​​the titanium alloy sample plate under specific macro-stress, the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy sample plate under specific macro-stress is obtained.

5. A method for detecting microscopic digital images of titanium alloy thermal processing deformation according to claim 4, characterized in that: The method of obtaining the total area of ​​all transverse core regions and all longitudinal core regions of the titanium alloy sample plate under a specific macro stress according to the transverse core region length value and the longitudinal core region length value of the titanium alloy sample plate under a specific macro stress comprises the following specific steps: The product of the transverse core area length value and the longitudinal core area length value of the titanium alloy sample plate under the specific macro stress is recorded as the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy sample plate under the specific macro stress.

6. The method for detecting microscopic digital images of titanium alloy thermal processing deformation according to claim 1, characterized in that: The method of obtaining the deformation degree of the titanium alloy sample plate under a specific macro stress according to the deformation degree of the transverse core area of ​​the titanium alloy sample plate under a specific macro stress, the deformation degree of each local microscopic image under a longitudinal scan under a specific macro stress, and the total area of ​​all transverse core areas and all longitudinal core areas under a specific macro stress comprises the following specific steps: The sum of the average value of the deformation degree of all transverse core areas of the titanium alloy sample plate under a specific macro stress and the difference between the maximum value and the minimum value of the deformation degree of all local micro images of the titanium alloy sample plate under a longitudinal scan under a specific macro stress is recorded as the total deformation degree of the titanium alloy sample plate under a specific macro stress; According to the total deformation degree of the titanium alloy sample plate under the specific macro-stress and the total area of ​​all transverse core regions and all longitudinal core regions under the specific macro-stress, the deformation degree of the titanium alloy sample plate under the specific macro-stress is obtained.

7. A method for detecting microscopic digital images of titanium alloy thermal processing deformation according to claim 6, characterized in that: The method of obtaining the deformation degree of the titanium alloy sample plate under a specific macro-stress according to the total deformation degree of the titanium alloy sample plate under a specific macro-stress and the total area of ​​all transverse core regions and all longitudinal core regions under the specific macro-stress comprises the following specific steps: The product of the total deformation degree of the titanium alloy sample plate under specific macro-stress and the total area of ​​all transverse core areas and all longitudinal core areas of the titanium alloy sample plate under specific macro-stress is recorded as the deformation degree of the titanium alloy sample plate under specific macro-stress.

8. The method for detecting microscopic digital images of titanium alloy thermal processing deformation according to claim 1, characterized in that: The specific steps of judging the quality of the titanium alloy material according to the deformation rate of the titanium alloy sample plate under macroscopic stress are as follows: The deformation rate of the titanium alloy sample plate under macroscopic stress is normalized to obtain the final deformation rate of the titanium alloy sample plate under macroscopic stress; When the final deformation rate of the titanium alloy specimen under macroscopic stress is less than the preset threshold , judging that the quality of titanium alloy material is the best; When the final deformation rate of the titanium alloy specimen under macroscopic stress is greater than or equal to the preset threshold and is less than or equal to the preset threshold When the titanium alloy material is judged to be of good quality; When the final deformation rate of the titanium alloy specimen under macroscopic stress is greater than the preset threshold and is less than or equal to the preset threshold When the quality of titanium alloy material is judged to be average; When the final deformation rate of the titanium alloy specimen under macroscopic stress is greater than the preset threshold , judging that the quality of titanium alloy material is not good.

Images