CN113049331A - Preparation method of nondestructive testing simulation test block and simulation test block - Google Patents
Preparation method of nondestructive testing simulation test block and simulation test block Download PDFInfo
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- CN113049331A CN113049331A CN202110272552.8A CN202110272552A CN113049331A CN 113049331 A CN113049331 A CN 113049331A CN 202110272552 A CN202110272552 A CN 202110272552A CN 113049331 A CN113049331 A CN 113049331A
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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Abstract
The invention provides a preparation method of a nondestructive testing simulation test block and the simulation test block, and the method comprises the following steps: hot pressing: setting the surface to be connected of one test block and the surface to be connected of the other test block to be in contact with each other, carrying out hot pressing on the two test blocks at the temperature of 0.5-0.8T and under a preset pressure, and setting the heat preservation time to be 40-100 min, wherein T is the melting point of the test block; at least one of the surface to be connected of one test block and the surface to be connected of the other test block is formed with a simulated defect; the predetermined pressure is adapted to the temperature and the holding time. The method provided by the invention can better control the test block and the deformation inside the test block by controlling the preparation process parameters (temperature, heat preservation time and pressure), and avoids the condition that the quality of the simulated test block is reduced due to the deformation of the test block and the internal defects in the prior art.
Description
Technical Field
The invention relates to the field of nondestructive testing, in particular to a preparation method of a nondestructive testing simulation test block and the simulation test block.
Background
The simulation test block is a test block containing simulation defects. The simulated defects may be, for example, artificially created, typically based on the specifics of the actual defect, so that the simulated defects can reproduce the artificial defect information.
The simulation test block has important characteristics of real defects, so that the simulation test block can reproduce the real detection working condition of a nondestructive detection object (sample), and has important practical application significance in the aspects of personnel qualification assessment, laboratory comparison/capability verification, simulation detection working condition and the like.
For example, the dummy block can be applied in a hot-press diffusion bonding: under certain pressure and temperature, two surfaces to be welded of two workpieces are mutually contacted, the welded parts are tightly contacted through microscopic plastic deformation, and atoms at the interface are mutually diffused in a certain time to form an integral joint. The joint area formed by diffusion bonding has no defects such as cast structure, brittle area, crack area and the like.
However, the actual considerations for the simulation test block in the thermocompression diffusion bonding in the prior art are not comprehensive, which results in that the simulation defects included in the bonded simulation test blocks are often adversely affected.
Disclosure of Invention
In view of the above, the present invention provides a method for preparing a nondestructive testing simulation test block and a simulation test block, and aims to solve the above technical problems.
In a first aspect, the present invention provides a method for preparing a nondestructive testing simulation test block, wherein the method comprises:
hot pressing: setting a surface to be connected of one test block and a surface to be connected of another test block to be in contact with each other, carrying out hot pressing on the two test blocks at the temperature of 0.5-0.8T and under a preset pressure, and setting the heat preservation time to be 40-100 min, wherein T is the melting point of the test blocks;
at least one of the surface to be connected of the one test block and the surface to be connected of the other test block is formed with a simulation defect;
the predetermined pressure is adapted to the temperature and the holding time.
Preferably, in the hot-pressing step, the temperature, the pressure and the holding time are obtained by:
obtaining preliminary theoretical test parameters of the temperature, the pressure and the heat preservation time, performing a test according to the preliminary theoretical test parameters and obtaining a test result, adjusting the test according to the test result, and performing the test until the optimal test parameters are obtained; or obtaining the optimal test parameters through an orthogonal test;
the pressure is 5-60 Mpa.
Preferably, the method further comprises a defect preparation step performed before the hot pressing step, the defect preparation step comprising:
determining the orientation of the simulated defect according to the pressure, the preset relative position relation between the simulated defect and the surface to be connected with the simulated defect;
and preparing the simulated defects, wherein the simulated defects comprise one or more of cavity defects, inclusion defects, crack defects and pore and loose defects.
Preferably, in the defect preparing step:
the cavity-like defect comprises a profiled groove formed via machining;
the inclusion type defects comprise the special-shaped groove and inclusions which are included in the special-shaped groove;
the crack-like defects include cracks formed via etching;
the pore and loose defects comprise the special-shaped groove, and metal powder and pore-forming agent filled in the special-shaped groove.
Preferably, the inclusion defects, the crack defects, the air holes and the porosity defects all comprise the cavity defects and defect parts obtained from natural defect test blocks and arranged in the special-shaped grooves.
Preferably, the method further comprises a surface treatment step performed before the defect preparation step, the surface treatment step comprising:
the surfaces to be joined are processed to a surface roughness Ra of less than 0.5 [ mu ] m and a parallelism of less than or equal to 0.3 °.
Preferably, the method further comprises a material selection step performed before the surface treatment step, the material selection step comprising:
the metallic raw material subjected to nondestructive inspection is selected as a material forming the base of the test block according to the acoustic characteristics, physical characteristics and application of the metallic material.
Preferably, the surface treatment step further comprises:
obtaining the surface roughness and the parallelism by machining;
in the case where an oxide film is present on the surface of the base, after the machining, the base is subjected to chemical surface treatment to remove the oxide film.
Preferably, in the hot pressing step, the pressure is applied in the following manner:
and after the pressure head completely contacts the first one of the two test blocks, the pressure head stops after performing 1mm displacement towards the direction of the second one of the two test blocks.
In a second aspect, the present invention provides a mock test block prepared by the method for preparing a non-destructive testing mock test block as described above.
The method provided by the invention can better control the test block and the deformation inside the test block by controlling the preparation process parameters (temperature, heat preservation time and pressure), and avoids the condition that the quality of the simulated test block is reduced due to the deformation of the test block and the internal defects in the prior art.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 shows a schematic view of an isometric view of a defect-free test block;
FIG. 2 shows a schematic diagram of an isometric view of a first defective test block;
FIG. 3 shows a schematic representation of an isometric view of a metallic inclusion;
FIG. 4 is a schematic diagram showing an exploded view of an assembly drawing of a second defective and non-defective test blocks;
FIG. 5 is a schematic diagram in perspective of an assembly view of a third defective and non-defective test blocks;
FIG. 6 is a schematic diagram of a hot pressing step performed on a non-defective test block and a first defective test block.
Reference numerals:
100-defect free test block; 110-a first upper surface; 120-a first lower surface;
200-a first defective test block; 210-a profiled groove; 220-a second upper surface; 230-a second lower surface;
300-a second defective test block; 310-porosity, porosity-like defects; 320-a third upper surface; 330-a third lower surface;
400-third defect test block; 410-cracking; 420-a fourth upper surface; 430-a fourth lower surface;
500-metallic inclusions;
600-pressure head; 700-cushion block.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The present invention provides a method for preparing a nondestructive testing simulation test block, which will be described in detail with reference to fig. 1 to 6.
In an embodiment, the method for preparing the nondestructive testing simulation test block includes:
hot pressing: setting the surface to be connected of one test block and the surface to be connected of the other test block to be in contact with each other, carrying out hot pressing on the two test blocks at the temperature of 0.5-0.8T and under a preset pressure, and setting the heat preservation time to be 40-100 min, wherein T is the melting point of the test block, and the preset pressure is matched with the temperature and the heat preservation time;
at least one of the surface to be connected of one test block and the surface to be connected of the other test block is formed with a simulated defect.
Reference may be made here first to fig. 6, the execution of which is schematically shown in fig. 6. The non-defective block 100 and the first defective block 200 (which may also be the remaining defective blocks, as an example herein) may be both formed in a cylindrical shape (see fig. 1 and 2, respectively, and will also be specifically mentioned in the following description). In fig. 6, the non-defective test block 100 may be stacked on the first defective test block 200, and on the basis of this, an indenter 600 is provided above the non-defective test block 100. The first defect block 200 is padded with a pad block 700, for example, the pad block 700 may be formed of graphite. Further, the spacer block 700 is positioned above the lower ram 600. In the hot pressing, the pressing head 600 located above may be pressed down.
Furthermore, in order to prevent the two test blocks from entering the gas between the two surfaces to be joined during the hot-pressing process to generate high-temperature oxidation products, the hot-pressing process is performed under vacuum (for example, at 133.3 × 10)-3～133.3*10-7Pa in vacuum) or the two test blocks are sealed and welded in vacuum in advance.
In the examples, temperature, pressure and holding time are three factors of the test block preparation process parameters, and the change of the temperature, the pressure and the holding time has great influence on the connection performance of two test blocks, and the influence of the temperature, the pressure and the holding time is combined. In the prior art, the test block is diffusion-connected at high temperature and high pressure, and usually has obvious deformation, which directly causes the problem that the internal defects of the produced simulation test block are deformed, so that the simulation defects are actually distorted, the capability of reproducing real defects is lost, and the actual use of the simulation test block is influenced.
In the embodiment, the hot pressing temperature is 0.5-0.8T (T is the melting point of the test block), the heat preservation time is 40-100 min, and the pressure is matched with the temperature and the heat preservation time. In this way, it is ensured that the test block is not deformed or slightly deformed in the hot pressing step, and the small deformation is deformation of the internal defect and does not affect the application requirements. In other words, if at least one of the temperature and the holding time is too small or too large, for example, the temperature is less than 0.5T and/or the holding time is less than 40min and the temperature is greater than 0.8T and/or the holding time is greater than 100min, the simulation defects in the produced simulation test block may be greatly deformed, which may affect the use. In practical applications, the temperature may be, for example, 0.55T, 0.6T, 0.65T, 0.7T and 0.75T, and the holding time may be, for example, 50min and 60min, 70min, 80min and 90 min.
In addition, in the embodiment, the temperature of 0.5-0.8T is also advantageous in that the temperature range is also suitable for the commonly used test block material, thereby making the method have good applicability, and as for the test block material, the following description will be specifically provided. Furthermore, the pressure of the hot pressing step is matched with the temperature and the heat preservation time, as mentioned above, the temperature, the heat preservation time and the pressure act together, and the pressure is matched with the other two, so that the simulation defect is further prevented from being greatly deformed to influence the use.
In an embodiment, the temperature, the holding time and the pressure of the process parameters can be determined before hot pressing the test block. Specifically, the temperature, pressure and holding time are obtained by: obtaining preliminary theoretical test parameters of temperature, pressure and heat preservation time, testing according to the preliminary theoretical test parameters and obtaining a test result, adjusting the test according to the test result, and then testing until the optimal test parameters are obtained. In particular, preliminary theoretical experimental parameters may be determined by finite element numerical simulation. The quality of the diffusion bonding interface and the deformation degree of the test block can be focused in the test results. Therefore, the process of obtaining the test parameters is intuitive for this approach.
The temperature, pressure and holding time can also be obtained by: the optimal experimental parameters were obtained by orthogonal experiments. The advantage of orthogonal tests is that the number of three test parameters is matched and the workload is low.
In the above two modes, a specific range of the pressure can be obtained, and in an embodiment, the pressure can be 5 to 60Mpa, for example, 15Mpa, 25Mpa, 35Mpa, 45Mpa, and 55 Mpa. Therefore, the hot pressing step can be directly performed according to the above two ways.
Furthermore, the pressure can also be applied directly in the following manner: after the indenter 600 is completely contacted with the first of the two test blocks, the indenter 600 is stopped after being displaced by 1mm in the direction of the second of the two test blocks. Furthermore, the temperature and the holding time are set in the above ranges, which makes it possible to perform the hot-pressing step also in this manner. For example, when the temperature is 0.5 to 0.8T, the ram 600 located above is completely contacted with the nondefective test block 100, and then the ram is stopped after moving down by 1mm, and the holding time is set to 40 to 100 min. The requirements in the hot pressing process can be met, and the efficiency is improved.
The hot pressing step is further preceded by a material selection step, a surface treatment step, and a defect preparation step, which are sequentially performed, and will be separately described below.
In an embodiment, the material of the base of the test block is formed as a metallic material, and the material selecting step includes: the metallic raw material subjected to the nondestructive inspection is selected as a material forming the base of the test block according to the acoustic characteristics (e.g., ultrasonic characteristics), physical characteristics, and application of the metallic material. The selected metal raw material may be, for example, low carbon steel, titanium alloy, aluminum alloy, high temperature alloy, high speed steel, stainless steel, and die steel. The material selection step is particularly advantageous for the design of the size and location of the defects in the subsequent defect preparation steps.
Further, the method further comprises a surface treatment step as mentioned above, the surface treatment step comprising: the surfaces to be joined are machined to a surface roughness Ra of less than 0.5 [ mu ] m and a parallelism of less than or equal to 0.3. Wherein the surface roughness and parallelism can be obtained by machining. The roughness Ra of less than 0.5 μm as used herein means roughness parallel to the machine direction and roughness perpendicular to the machine direction. The significance of the surface treatment step is that the surface to be connected of the test block is more suitable for the hot pressing process, and poor connection caused by overlarge roughness and overlarge deformation of the simulated test block caused by overlarge parallelism are avoided. The respective test pieces shown in fig. 1, 2, 4 and 5, as mentioned above, are formed in a cylindrical shape, and their surfaces to be connected are the respective upper and lower surfaces, that is, the surface treatment step may be a step of subjecting the upper and lower surfaces of the test pieces to the above-mentioned treatment.
Further, in the case of an oxide film-free substrate, the above surface treatment step is sufficient, but in the case of an oxide film on the substrate, the surface treatment step further comprises: in the case where an oxide film is present on the surface of the substrate, after the above machining, the substrate is subjected to chemical surface treatment to remove the oxide film. Three types of cases of removing the oxide film of the substrate having the oxide film will be described as examples.
The first category is the steel category: the method is suitable for removing the iron and steel oxide films such as stainless steel, high-temperature alloy and the like. The specific steps are organic solvent degreasing → anodic electrolytic degreasing (if necessary) → acid washing → deionized water washing → drying. Wherein, the acid cleaning formula is as follows: hydrofluoric acid (45-60ml/L), nitric acid (50-60ml/L), sulfuric acid (40-50ml/L) and hexamethylenetetramine (0.5-1.2 g/L). Acid washing: and (4) at room temperature for 1-3 min.
The second category is titanium alloys, specifically comprising the steps of degreasing with organic solvent → degreasing electrochemically (if necessary) → pickling → rinsing with deionized water → drying. Acid washing formula: 40% hydrofluoric acid (100ml/L) and nitric acid (100 ml/L). In addition, acid washing: 30-60s at room temperature.
The third category is aluminum alloy, and the specific steps are organic solvent degreasing → alkali washing → light extraction → deionized water washing → drying. Wherein, the alkali washing formula is as follows: sodium hydroxide (30-50g/L), alkaline washing: 5-10s at room temperature, and the light-emitting formula is as follows: nitric acid 210-350 ml/L.
In addition, it should be noted that the above process of removing the oxide film may be performed only on the upper and lower surfaces (i.e., the surfaces to be connected) of the test block, or may be performed on all the surfaces of the test block.
On this basis, the defect preparation step will be further described below. The defect preparation steps comprise: determining the orientation of the simulated defect according to the pressure (namely the axial pressure born by the test block) and the preset relative position relation between the simulated defect and the surface to be connected with the simulated defect; preparation of simulated defects is performed, the simulated defects including one or more of void-type defects, inclusion-type defects, crack-type defects, and porosity-type defects 310.
Specifically, as an example, the defective test blocks listed below each have only one type of defect described above, but are merely examples, and as mentioned above, one test block may have a plurality of simulated defects, which may be combined and adjusted according to actual situations. As shown in fig. 1, fig. 1 shows a schematic view of a defect-free test block 100 comprising a first upper surface 110 and a first lower surface 120, both surfaces being defect-free.
Referring further to fig. 2, fig. 2 shows a first defective block 200 prepared based on the non-defective block 100, wherein the simulated defects included in the first defective block 200 are cavity-type defects. Specifically, the first defect test block 200 includes a second upper surface 220 and a second lower surface 230, and the cavity-type defect may be formed on the second upper surface 220. Wherein the cavity-like defect may be formed as a profiled groove 210 formed via machining. For example, by milling a profiled groove 210 of a predetermined shape, the depth may be 0.5 mm.
Referring further to fig. 3, inclusion-type defects may include inclusions as shown in fig. 3 disposed in the special-shaped groove 210 on the basis of the first defect block 200 having the special-shaped groove 210 described above. Specifically, according to the size of the deformed groove 210, the metal inclusions 500 of the same shape (for example, the entire size may be smaller than the entire size of the deformed groove 210 by 0.025mm to facilitate assembly while obtaining a good inclusion effect), of different materials, and having the same thickness as the depth of the deformed groove 210 are machined. The metallic inclusions 500 may be, for example, refractory hard metals such as WC — Co hard alloys (hard alloys containing tungsten carbide as a main component) and the like, and further, the inclusions may be non-metallic materials such as high temperature resistant hard non-metals such as graphite, boron carbide, silicon carbide and the like.
As shown in fig. 4, fig. 4 is a schematic diagram illustrating an explosion diagram of a simulation test block, in which a non-defective test block 100 is located above the simulation test block, a second defective test block 300 is located below the simulation test block, the second defective test block 300 includes a third upper surface 320 and a third lower surface 330, and a void-like defect 310 may be formed on the third upper surface 320. The porosity, porosity-type defects 310 may include the shaped groove 210 and the metal powder and pore-forming agent filled in the shaped groove 210. Specifically, according to the design purpose, the metal powder and pore-forming agent (urea or ammonium bicarbonate, etc.) for the same material as the test block substrate are uniformly mixed and filled into the special-shaped groove 210 of the first defective test block 200, and the uniformly mixed powder is compacted to be flush with the third upper surface 320. The particle size of the metal powder can be in the range of 10-200 μm, the pore-forming particle size can be in the range of 100-500 μm, the pore-forming agent proportion range can be 30-70%, and in addition, the particle size of the metal powder, the pore-forming particle size and the pore-forming agent proportion range can be adjusted according to the actual porosity requirement.
As shown in fig. 5, fig. 5 shows a further simulation block, in which the upper non-defective block 100 is shown as being almost transparent in the drawing, thereby showing the lower third defective block 400, the third defective block 400 including a fourth upper surface 420 and a fourth lower surface 430, and crack-type defects are formed on the fourth upper surface 420. In an embodiment, the crack-like defects include cracks 410 formed via an etching process. Specifically, the crack defect width may be less than 0.6mm, and the crack defect may be etched using a copper electrode spark.
In addition, the inclusion-type defects, the crack-type defects, and the porosity-type defects 310 may also include cavity-type defects and defect portions obtained from a natural defect block disposed in the irregular groove 210. For example, taking the inclusion-type defect as an example, the inclusion-type defect formed on the natural defect block may be removed from the cavity-type defect of the first defect block 200 and then placed in the cavity-type defect. This is advantageous in some degree to improve the efficiency of the preparation.
The test block surface pretreatment method related by the method can be suitable for various metal materials, and particularly provides a surface treatment process flow and a formula suitable for steel, titanium alloy and aluminum alloy metal materials, so that the problem that oxide films on the metal surfaces of various alloys related by the method are difficult to remove can be well solved, and interface quality guarantee is provided for the subsequent hot-pressing preparation process.
The four types of defect processing technologies and steps listed in the method cover common defect types, compared with the prior art, the size, the position and the property types of the defects can be determined independently, the defects generated by mechanical indentation or chemical etching in the prior art are all cavity defects, the existence of inclusions or other types of defects cannot be simulated, the difference between the size and the type of the defects and the shape or the composition of real defects is large (particularly, the size and the shape of the defects are difficult to determine due to the liquidity of liquid), and the real conditions of the defects cannot be simulated.
The method can better control the test block and the deformation inside the test block by controlling the preparation process parameters (temperature, heat preservation time and pressure), and avoids the condition that the quality of the simulation test block is reduced due to the deformation of the test block and the internal defects in the prior art.
The invention also provides a simulation test block, which is prepared by the preparation method of the nondestructive testing simulation test block and is not repeated herein.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all changes, direct or indirect, which are made by using the contents of the description and the drawings of the present invention and the related technical fields under the innovative conception of the present invention are included in the scope of the present invention.
Claims (10)
1. A method for preparing a nondestructive testing simulation test block is characterized by comprising the following steps:
hot pressing: setting a surface to be connected of one test block and a surface to be connected of another test block to be in contact with each other, carrying out hot pressing on the two test blocks at the temperature of 0.5-0.8T and under a preset pressure, and setting the heat preservation time to be 40-100 min, wherein T is the melting point of the test blocks;
at least one of the surface to be connected of the one test block and the surface to be connected of the other test block is formed with a simulation defect;
the predetermined pressure is adapted to the temperature and the holding time.
2. The method for preparing a nondestructive testing analog test piece according to claim 1,
in the hot-pressing step, the temperature, the pressure and the holding time are obtained by:
obtaining preliminary theoretical test parameters of the temperature, the pressure and the heat preservation time, performing a test according to the preliminary theoretical test parameters and obtaining a test result, adjusting the test according to the test result, and performing the test until the optimal test parameters are obtained; or obtaining the optimal test parameters through an orthogonal test;
the pressure is 5-60 Mpa.
3. The method for preparing a non-destructive testing analog test block according to claim 1, further comprising a defect preparing step performed before said hot-pressing step, said defect preparing step comprising:
determining the orientation of the simulated defect according to the pressure, the preset relative position relation between the simulated defect and the surface to be connected with the simulated defect;
and preparing the simulated defects, wherein the simulated defects comprise one or more of cavity defects, inclusion defects, crack defects and pore and loose defects.
4. The method for preparing a nondestructive testing dummy block according to claim 3, wherein in said defect preparing step:
the cavity-like defect comprises a profiled groove formed via machining;
the inclusion type defects comprise the special-shaped groove and inclusions which are included in the special-shaped groove;
the crack-like defects include cracks formed via etching;
the pore and loose defects comprise the special-shaped groove, and metal powder and pore-forming agent filled in the special-shaped groove.
5. The method for preparing a nondestructive testing analog test piece according to claim 3,
the inclusion defects, the crack defects, the air holes and the loose defects comprise the cavity defects and defect parts which are arranged in the special-shaped groove and are obtained from natural defect test blocks.
6. The method for preparing a non-destructive testing simulated test block according to claim 3, further comprising a surface treatment step performed before said defect preparation step, said surface treatment step comprising:
the surfaces to be joined are processed to a surface roughness Ra of less than 0.5 [ mu ] m and a parallelism of less than or equal to 0.3 °.
7. The method for preparing a non-destructive testing analog test block according to claim 6, further comprising a material selection step performed before said surface treatment step, said material selection step comprising:
the metallic raw material subjected to nondestructive inspection is selected as a material forming the base of the test block according to the acoustic characteristics, physical characteristics and application of the metallic material.
8. The method for preparing a non-destructive testing analog test block according to claim 7, wherein said surface treatment step further comprises:
obtaining the surface roughness and the parallelism by machining;
in the case where an oxide film is present on the surface of the base, after the machining, the base is subjected to chemical surface treatment to remove the oxide film.
9. The method for preparing a non-destructive testing analog test block according to claim 1, wherein in said hot-pressing step, said pressure is applied in the following manner:
and after the pressure head completely contacts the first one of the two test blocks, the pressure head stops after performing 1mm displacement towards the direction of the second one of the two test blocks.
10. A mock test block, characterized in that it is produced by the method for the preparation of a non-destructive testing mock test block according to any of the claims from 1 to 9.
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