Composite strengthening process method applied to metal material

Abstract

The invention discloses a composite strengthening process method applied to a metal material, and relates to the field of structural strength and surface strengthening, and the method comprises the following steps: arranging a metal sample in a water area, and then carrying out jet strengthening on the metal sample by adopting a jet strengthening process with mixed solid particles; and ultrasonic vibration is conducted on the water area to drive solid particles in the water area to polish and strengthen the surface of the metal sample subjected to jet strengthening, the fatigue performance of the metal material can be improved, the surface integrity is greatly improved while surface strengthening of the metal material is achieved, and great contribution is provided for design and optimization of the metal material surface strengthening process.

Description

Technical Field

[0001] The present application relates to the field of structural strength and surface strengthening, and in particular to a composite strengthening process method applied to metal materials. Background Art

[0002] Metal materials are widely used in construction machinery, automobiles, engineering machinery, energy and chemical industries due to their excellent process and mechanical properties. There are many complex working conditions during service. For example, metal components are very likely to fail under cyclic loads. Studies have shown that fatigue is the main failure form of metal components. Nearly 80% of accidents in modern industry are caused by metal fatigue. Once a component is fatigued and not discovered or restored in time, it will bring irreversible consequences.

[0003] Therefore, there is a need for a composite strengthening process method for metal materials that can improve the fatigue performance of metal materials. This method can greatly improve the surface integrity while achieving surface strengthening of metal materials, and make a huge contribution to the design and optimization of metal material surface strengthening processes. Summary of the invention

[0004] The purpose of this application is to provide a composite strengthening process method applied to metal materials, which can improve the fatigue performance of metal materials, greatly improve the surface integrity while achieving surface strengthening of metal materials, and make a great contribution to the design and optimization of metal material surface strengthening process.

[0005] To achieve the above objectives, this application provides the following solutions:

[0006] In a first aspect, the present application provides a composite strengthening process method applied to metal materials, comprising:

[0007] The metal sample is placed in water, and then the metal sample is jet-strengthened by a jet-strengthening process with solid particles included;

[0008] The water area is subjected to ultrasonic vibration to drive the solid particles in the water area to polish and strengthen the surface of the jet-strengthened metal sample.

[0009] Optionally, the step of placing the metal sample in water and then jet-strengthening the metal sample using a jet-strengthening process with solid particles, specifically includes:

[0010] placing a metal sample on a water jet machine tool workbench; the water jet machine tool workbench is completely submerged in water;

[0011] The jet strengthening process is used to jet strengthen the metal sample, and the nozzle is used to mix the solid particles in the water area.

[0012] Optionally, the ultrasonic vibration of the water area is performed to drive the solid particles in the water area to polish and strengthen the surface of the metal sample after the jet strengthening, specifically:

[0013] The ultrasonic impact gun is turned on to perform ultrasonic vibration on the water area, so as to drive the solid particles in the water area to polish and strengthen the surface of the metal sample after the jet strengthening.

[0014] Optionally, the frequency f of the ultrasonic vibration is in the range of 5KHz≤f≤20KHz.

[0015] Optionally, the amplitude A of the ultrasonic vibration is in the range of 15 μm≤A≤50 μm.

[0016] Optionally, the jet pressure P of the jet enhancement process is in the range of 20MPa≤P≤200MPa.

[0017] Optionally, the jet target distance W of the jet enhancement process is in the range of 30dμm≤W≤75dμm, wherein d represents the diameter of the nozzle.

[0018] Optionally, the diameter of the nozzle is 0.33 mm.

[0019] According to the specific embodiments provided in this application, this application has the following technical effects:

[0020] The present application provides a composite strengthening process method for metal materials. By combining jet impact and ultrasonic vibration impact, the strengthening and polishing of metal materials are integrated. Solid particles are provided for better polishing and strengthening, which can improve the fatigue performance of metal materials. While strengthening the surface of metal materials, the surface integrity is greatly improved, which makes a great contribution to the design and optimization of metal material surface strengthening processes. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 A schematic diagram of a process flow of a composite strengthening process method applied to metal materials provided in one embodiment of the present application;

[0023] Figure 2 A flow chart of a composite strengthening process method applied to metal materials provided in another embodiment of the present application;

[0024] Figure 3This is an experimental result diagram of the surface morphology obtained by treating GH4169 nickel-based high-temperature alloy using the composite strengthening process method for metal materials provided by the present application;

[0025] Figure 4 This is a diagram of the experimental results of the surface morphology obtained by treating TC4 titanium alloy using the composite strengthening process method for metal materials provided in the present application. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0027] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0028] In an exemplary embodiment, Figure 1 As shown, a composite strengthening process method applied to metal materials is provided, comprising the following steps, wherein:

[0029] Step 201: placing a metal sample in water, and then jet strengthening the metal sample using a jet strengthening process with inclusion of solid particles.

[0030] Step 202: Ultrasonic vibration is performed on the water area to drive the solid particles in the water area to polish and strengthen the surface of the metal sample after jet strengthening. The strengthening in this application can also be called micro-strengthening. "Micro-strengthening" means that after the metal sample is jet strengthened, the solid particles in the water area are stimulated by ultrasonic vibration to further strengthen the metal surface. This process uses tiny particles to perform additional mechanical actions on the metal surface, thereby optimizing and strengthening the microstructure of the material surface, especially improving the fatigue performance and surface integrity of the metal material. It emphasizes that as a secondary effect after jet strengthening, the quality of the metal surface is enhanced in a subtle way. "Micro-strengthening" plays an important role in the composite strengthening process. It is a kind of refined strengthening in the strengthening process.

[0031] The implementation of the above-mentioned steps 201 to 202 can improve the fatigue performance of metal materials, greatly enhance the surface integrity while achieving surface strengthening of metal materials, and make a great contribution to the design and optimization of metal material surface strengthening process.

[0032] In another exemplary embodiment of the present application, a metal sample is placed in water, and then a jet strengthening process with solid particles is used to strengthen the metal sample, specifically including:

[0033] The metal sample is placed on a water jet machine table; the water jet machine table is completely submerged in a water area.

[0034] The jet strengthening process is used to jet strengthen the metal sample, and the nozzle is used to mix the solid particles in the water area.

[0035] In another exemplary embodiment of the present application, ultrasonic vibration is applied to the water area to drive solid particles in the water area to polish and strengthen the surface of the metal sample after jet strengthening, specifically:

[0036] The ultrasonic impact gun is turned on to perform ultrasonic vibration on the water area, so as to drive the solid particles in the water area to polish and strengthen the surface of the metal sample after the jet strengthening.

[0037] In another exemplary embodiment of the present application, the frequency f of the ultrasonic vibration is in the range of 5KHz≤f≤20KHz.

[0038] In another exemplary embodiment of the present application, the amplitude A of the ultrasonic vibration is in the range of 15 μm≤A≤50 μm.

[0039] In another exemplary embodiment of the present application, the jet pressure P of the jet enhancement process is in the range of 20MPa≤P≤200MPa.

[0040] In another exemplary embodiment of the present application, the jet target distance W of the jet enhancement process is in the range of 30dμm≤W≤75dμm, wherein d represents the diameter of the nozzle.

[0041] In another exemplary embodiment of the present application, the diameter of the nozzle is 0.33 mm.

[0042] The present application realizes the integration of strengthening and polishing of metal materials through water jet impact and ultrasonic vibration impact, and can achieve both improvement of surface quality and fatigue life of composite strengthened metal materials, and the overall process flow is easy to operate.

[0043] This application provides a more specific embodiment to introduce the above-mentioned composite strengthening process method applied to metal materials in detail, such as Figure 2 As shown:

[0044] (1) First, the parameters of the sample are selected, including the width of the micro-convex hull (L1 = 2.5d), height (h = 1 / 150d) and center distance (L2 = 2d), where d represents the nozzle diameter.

[0045] (2) Using a laser to perform laser roughening on a metal material according to the parameters selected in (1) to obtain a micro-texture, i.e., a metal sample, that satisfies the parameters selected in (1).

[0046] (3) Placing the metal sample prepared in (2) on a water jet machine workbench, wherein the workbench is in a submerged state and completely submerged in water, for jet strengthening, wherein the jet target distance W is between 30 d and 75 d, and the jet pressure is between 100 MPa and 150 MPa.

[0047] (4) The sample of (3) is jet-enhanced at a pressure of 20 to 200 MPa. At the same time, a nozzle is used to mix the solid particles, thereby forming a water jet-enhanced process with solid particles. At this time, many solid particles already exist in the water.

[0048] (5) At the same time, the ultrasonic impact gun is turned on to perform ultrasonic vibration on the water area, and the solid particles in the water area are driven by ultrasonic vibration to perform secondary micro-strengthening / polishing on the jet-strengthened surface. The ultrasonic amplitude is 15 to 50 μm, and the ultrasonic frequency is 5K to 20KHz, so as to achieve the effect of improving the residual compressive stress and smoothness of the strengthened surface.

[0049] The present application also provides two embodiments to verify the experimental effect of the above-mentioned composite strengthening process method applied to metal materials.

[0050] In this embodiment, GH4169 nickel-based high-temperature alloy is selected as the research object, and a composite strengthening experimental scheme of GH4169 nickel-based high-temperature alloy based on the synergistic effect of ultrasonic vibration impact and solid particle inclusion water jet is formulated as shown in Table 1. The same parameters of traditional single water jet strengthening are selected as the control group.

[0051] Table 1 Composite strengthening experimental scheme

[0052]

[0053] Table 2 shows the maximum residual compressive stress experimental results obtained by treating GH4169 nickel-based high-temperature alloy using the composite strengthening process method for metal materials provided by the present application. By comparing the maximum residual compressive stress values ​​in Table 2, it can be seen that the maximum residual compressive stress obtained by the composite strengthening process method for metal materials provided by the present application is much higher than that of the control group, indicating that the composite strengthening process method for metal materials provided by the present application can greatly improve the fatigue life of GH4169 nickel-based high-temperature alloy.

[0054] Table 2 Composite strengthening residual stress test results

[0055]

[0056]

[0057] Figure 3 This is an experimental result diagram of the surface morphology obtained by treating the GH4169 nickel-based high-temperature alloy using the composite strengthening process method for metal materials provided in the present application. Figure 3 (a) is the surface morphology of GH4169 nickel-based high-temperature alloy treated by composite strengthening process. Figure 3 (b) is the surface morphology of the control group GH4169 nickel-based superalloy. Figure 3 It can be seen intuitively that the surface quality obtained by the composite strengthening process method for metal materials provided in the present application is much higher than that of the control group as a whole, indicating that the composite strengthening process method for metal materials provided in the present application can greatly improve the surface integrity of the GH4169 nickel-based high-temperature alloy.

[0058] In this embodiment, TC4 titanium alloy is selected as the research object, and a composite strengthening experimental scheme of TC4 titanium alloy based on the synergistic effect of ultrasonic vibration impact and solid particle inclusion water jet is formulated as shown in Table 3. The same parameters of traditional single water jet strengthening are selected as the control group.

[0059] Table 3 Composite strengthening experimental plan

[0060]

[0061] Table 4 shows the maximum residual compressive stress experimental results obtained by treating TC4 titanium alloy with the composite strengthening process method for metal materials provided by the present application. By comparing the maximum residual compressive stress values ​​in Table 4, it can be seen that the maximum residual compressive stress obtained by the composite strengthening process method for metal materials provided by the present application is much higher than that of the control group, indicating that the composite strengthening process method for metal materials provided by the present application can greatly improve the fatigue life of TC4 titanium alloy.

[0062] Table 4 Composite strengthening residual stress test results

[0063]

[0064] Figure 4 This is an experimental result diagram of the surface morphology obtained by treating TC4 titanium alloy using the composite strengthening process method for metal materials provided by the present application. Figure 4 (a) is a surface morphology image obtained by treating TC4 titanium alloy using a composite strengthening process; Figure 4 (b) is the surface morphology of the TC4 titanium alloy in the control group. Figure 4It can be seen intuitively that the surface quality obtained by the composite strengthening process method for metal materials provided in the present application is overall much higher than that of the control group, indicating that the composite strengthening process method for metal materials provided in the present application can greatly improve the surface integrity of TC4 titanium alloy.

[0065] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A composite strengthening process for metal materials, characterized in that: The composite strengthening process method applied to metal materials comprises: The metal sample is placed in water, and then the metal sample is jet-strengthened by a jet-strengthening process with solid particles included; The water area is subjected to ultrasonic vibration to drive the solid particles in the water area to polish and strengthen the surface of the jet-strengthened metal sample.

2. The composite strengthening process for metal materials according to claim 1, characterized in that: The metal sample is placed in the water, and then the jet strengthening process with solid particles is used to strengthen the metal sample, which specifically includes: placing a metal sample on a water jet machine tool workbench; the water jet machine tool workbench is completely submerged in water; The jet strengthening process is used to jet strengthen the metal sample, and the nozzle is used to mix the solid particles in the water area.

3. The composite strengthening process for metal materials according to claim 1, characterized in that: Ultrasonic vibration is applied to the water area to drive the solid particles in the water area to polish and strengthen the surface of the metal sample after jet strengthening, specifically: The ultrasonic impact gun is turned on to perform ultrasonic vibration on the water area, so as to drive the solid particles in the water area to polish and strengthen the surface of the metal sample after the jet strengthening.

4. The composite strengthening process for metal materials according to claim 1, characterized in that: The frequency f of the ultrasonic vibration is in the range of 5KHz≤f≤20KHz.

5. The composite strengthening process for metal materials according to claim 1, characterized in that: The amplitude A of the ultrasonic vibration is in the range of 15 μm≤A≤50 μm.

6. The composite strengthening process for metal materials according to claim 1, characterized in that: The jet pressure P of the jet strengthening process is in the range of 20MPa≤P≤200MPa.

7. The composite strengthening process for metal materials according to claim 2, characterized in that: The jet target distance W of the jet enhancement process is in the range of 30dμm≤W≤75dμm, wherein d represents the diameter of the nozzle.

8. The composite strengthening process for metal materials according to claim 2, characterized in that: The diameter of the nozzle is 0.33 mm.

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