Remanufacturing method of failed heterostructure member

Abstract

The invention provides a remanufacturing method of a failed heterostructural member, which comprises the following steps: mutually melting a remanufacturing filling material and a matrix element of the heterostructural member at a failed part of the heterostructural member to form a medium-entropy alloy molten pool in situ, and forming a medium-entropy alloy joint when the medium-entropy alloy molten pool is solidified to complete the repair of the failed heterostructural member, wherein the remanufacturing filling material is a non-high-entropy alloy material. The medium-entropy alloy joint is formed in situ when the remanufacturing filling material and the matrix element of the heterostructure part are mutually fused, so that the generation of brittle intermetallic compounds in the production and remanufacturing repair process of the heterostructure part is avoided, the remanufacturing life extension of the failed heterostructure part can be realized, and a large amount of resources and energy are saved.

Description

Technical Field

[0001] The present invention relates to the technical field of additive remanufacturing, and in particular to a remanufacturing method for a failed heterogeneous structural component. Background Art

[0002] Heterogeneous structural parts can give full play to the advantages of different materials, greatly reduce the complexity of the system, reduce the overall weight of the system and improve its efficiency, and improve the reliability and life of the system at a relatively low cost. They are popular and widely used in aerospace, nuclear industry, military industry, automobile and medicine, such as steel-aluminum heterogeneous structural parts in ships, alumina ceramics and titanium alloy heterogeneous composite components on nuclear power equipment, C / C composite materials and nickel-based high-temperature alloy heterogeneous composite components on aircraft, and different types of steel heterogeneous composite structural parts on artillery.

[0003] Although heterogeneous structural parts have obvious advantages, when different materials are used for fusion manufacturing of heterogeneous components, manufacturing is often difficult due to differences in the physical properties of the materials, especially for heterogeneous materials with different lattice structures. When directly combined, due to their low reaction enthalpy, hard and brittle intermetallic compounds will be generated, affecting the performance of heterogeneous structural parts. For example, TiFe and TiFe2 intermetallic compounds will be generated at the interface of Fe-Ti heterogeneous components, and the performance of Ti-Al heterogeneous components will be reduced due to the generation of intermetallic compounds such as TiAl, Ti3Al, and TiAl3. Even if an intermediate transition layer is used to alleviate it, such as the production and preparation of titanium steel heterogeneous components, intermediate transition layers such as Cu, Ni, and Ag are often added to inhibit the generation of brittle intermetallic compounds, avoid cracks, and improve the performance of Fe-Ti heterogeneous components. However, this cannot fundamentally solve the problem of reduced performance of heterogeneous components caused by the generation of intermetallic compounds. At the same time, once the heterogeneous component fails due to interface cracking, there is currently no suitable remanufacturing technology to achieve the remanufacturing and life extension of the heterogeneous component, resulting in a huge waste of resources and energy. Therefore, the prior art needs to be further developed. Summary of the invention

[0004] In view of the various deficiencies of the prior art, in order to solve the above problems, a remanufacturing method for failed heterogeneous structural parts is proposed, and the following technical solutions are provided: A method for remanufacturing a failed heterogeneous structural component, the method comprising: melting a remanufacturing filling material with a matrix element of the heterogeneous structural component at a failed portion of the heterogeneous structural component to form a medium entropy alloy molten pool in situ, and forming a medium entropy alloy joint when the high entropy alloy molten pool solidifies to complete the repair of the failed heterogeneous structural component, wherein the remanufacturing filling material is a non-high entropy alloy material.

[0005] Furthermore, the remanufactured filling material contains at least two matrix elements of heterogeneous structural parts.

[0006] Furthermore, the remanufactured filling material comprises at least three metal elements, and the total amount of the metal elements in the remanufactured filling material that are the same as the matrix elements accounts for 75-90% of the total amount of the metal elements in the remanufactured filling material in terms of molar percentage.

[0007] Furthermore, the heterogeneous structural component is a PCrNi3MoVA / 40Cr steel heterogeneous component, and the remanufactured filling material is NiCrCo twisted wire.

[0008] Furthermore, in terms of molar percentage, the Ni element in the NiCrCo stranded wire is 65-70%, the Cr element is 15-20%, and the Co element is 14-18%.

[0009] Furthermore, in terms of molar percentage, the Ni element in the NiCrCo stranded wire is 66.72%, the Cr element is 16.71%, and the Co element is 16.57%.

[0010] Furthermore, the heterogeneous structural component is pre-processed before being melted with the remanufactured filling material, and the pre-processing includes performing groove processing on the failed part of the heterogeneous structural component.

[0011] Furthermore, the beveling angle range of the beveling processing is 45°-120°.

[0012] Furthermore, the remanufactured filler material is mutually melted with the matrix element of the heterogeneous structural component through a rotary arc forming process.

[0013] Furthermore, a tempering treatment is performed after the rotary arc forming process is completed.

[0014] Beneficial effects: 1. The present invention regulates the proportion of metal elements in the remanufacturing filler material so that a medium-entropy alloy joint is formed in situ when the metal elements are mutually melted with the matrix elements of the heterogeneous structural parts, thereby avoiding the generation of brittle intermetallic compounds during the production and remanufacturing and repair of heterogeneous components, and can achieve the remanufacturing and life extension of failed heterogeneous components, saving a lot of resources and energy.

[0015] 2. In addition, the present application can inhibit the formation of brittle intermetallic compounds, and the fusion zone solidifies to form a single-phase or two-phase solid solution mid-entropy alloy. It can also effectively reduce the tensile stress generated during the cooling process of the fusion zone, inhibit the generation of cracks, and improve the reliability and overall mechanical properties of the bonding area of ​​heterogeneous components. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a cracking failure diagram of the PCrNi3MoVA / 40Cr steel heterogeneous component of the present invention. DETAILED DESCRIPTION

[0017] In order to enable those skilled in the art to better understand the technical solution of the present invention, the technical solution of the present invention is clearly and completely described below in conjunction with the embodiments of the present invention. Based on the embodiments in this application, other similar embodiments obtained by ordinary technicians in this field without making any creative work should all fall within the scope of protection of this application.

[0018] According to an embodiment of the present invention, a method for remanufacturing a failed heterogeneous structural component is provided, characterized in that the remanufacturing method comprises: at the failed part of the heterogeneous structural component, the remanufacturing filling material and the matrix element of the heterogeneous structural component are mutually melted to form a medium entropy alloy molten pool in situ, and the high entropy alloy molten pool is solidified to form a medium entropy alloy joint to complete the repair of the failed heterogeneous structural component, wherein the remanufacturing filling material is a non-high entropy alloy material. When the remanufacturing filling material and the matrix element of the heterogeneous structural component are mutually melted, a medium entropy alloy joint is formed in situ, which avoids the generation of brittle intermetallic compounds during the production and remanufacturing repair process of the heterogeneous component, can achieve the remanufacturing and life extension of the failed heterogeneous component, and save a lot of resources and energy. In addition, the generation of brittle intermetallic compounds can be suppressed, and the fusion zone solidifies to form a single-phase or two-phase solid solution high entropy alloy. It can also effectively reduce the tensile stress generated during the cooling process of the fusion zone, suppress the generation of cracks, and improve the reliability and overall mechanical properties of the heterogeneous component joint area.

[0019] The remanufactured filling material contains at least two matrix elements of heterogeneous structural parts. The remanufactured filling material includes at least three metal elements, and the total amount of metal elements in the remanufactured filling material that are the same as the matrix elements accounts for 75-90% of the total amount of metal elements in the remanufactured filling material in terms of molar percentage. Specifically, a specific remanufactured filling material is selected according to the heterogeneous structural part, and the ratio of the metal elements in the remanufactured filling material is adjusted so that the metal elements of the remanufactured filling raw material and the matrix elements of the heterogeneous structural part are matched to form a medium-entropy alloy joint. On the one hand, the remanufactured filling material is not an arbitrary metal element, and it needs to be selected according to the heterogeneous structural part. According to the elemental composition of the heterogeneous component, a remanufactured filling material that can be fused with the heterogeneous component elements to form an entropy-controlled alloy is selected or designed. On the other hand, the molar ratio of the metal elements of the remanufactured filling material needs to be regulated to obtain a high-quality medium-entropy alloy joint to complete the repair of the failed heterogeneous structural part.

[0020] For example, the remanufacturing filling material corresponding to the PCrNi3MoVA / 40Cr steel heterogeneous component is NiCrCo twisted wire, and the remanufacturing filling material corresponding to the Ti6Al4V / 45 steel heterogeneous component is NbNiCrFeTi twisted wire.

[0021] In addition, the heterogeneous structural parts are pre-treated before being melted with the remanufactured filling material, and the pre-treatment includes beveling the failed parts of the heterogeneous structural parts. Specifically, the beveling angle of the beveling processing is in the range of 45°-120°. When the beveling angle is less than 45°, the beveling is too small and it is easy to cause problems such as insufficient penetration and difficulty in operation; when the beveling angle is greater than 120°, it is easy to cause material waste, and there is a problem such as increased risk of expansion and deformation of the heat-affected zone.

[0022] The in-situ rotating arc entropy control remanufacturing process method of the heterogeneous component of the present invention comprises the following specific steps: (1) Based on the elemental composition of the heterogeneous component, select or design a remanufacturing filler material that can fuse with the elements of the heterogeneous component to form an entropy controlled alloy.

[0023] (2) Develop a remanufacturing process plan for failed heterogeneous components, including pre-remanufacturing treatment, remanufacturing forming, and post-remanufacturing treatment plans.

[0024] (3) Machining methods are used to process the failure sites of heterogeneous components, remove the brittle intermetallic compound parts and fatigue layer, and perform groove processing.

[0025] (4) Fix the heterogeneous component to be remanufactured on the corresponding workbench or positioner. Avoid clamping it too tightly, which may cause excessive stress and deformation during the rotating arc remanufacturing forming process.

[0026] (5) According to the formulated remanufacturing forming process plan, select appropriate process parameters to carry out rotary arc remanufacturing forming on heterogeneous components.

[0027] (6) Post-processing of remanufactured heterogeneous components.

[0028] Specifically, the remanufacturing filling material is wire. The wire includes mature powder core wire and self-designed and prepared twisted wire. The wire has no less than 3 main components, and the content of the main elements when mixed evenly with two heterogeneous matrix elements meets the principle of configuration entropy not less than 1R (R is the gas constant, 8.314 J / (mol·K)). The content of the matrix element when the two heterogeneous matrix elements are mixed evenly is calculated by the dilution rate during rotary arc forming. The dilution rate during rotary arc forming ranges from 40% to 60%.

[0029] The remanufacturing forming plan specifically includes the design of process parameters such as substrate preheating temperature, arc rotation frequency, current, voltage, wire feeding speed, forming deposition speed and shielding gas flow rate.

[0030] The post-processing is specifically to perform tempering treatment on the remanufactured heterogeneous components to eliminate the rotary arc forming remanufacturing residual stress.

[0031] Next, PCrNi3MoVA / 40Cr steel heterogeneous components are taken as an example for explanation.

[0032] Example 1 The specific steps to achieve in-situ rotating arc entropy control remanufacturing of PCrNi3MoVA / 40Cr steel heterogeneous components are as follows: (1) Prepare the failed PCrNi3MoVA / 40Cr steel heterogeneous component. The cracking failure condition of the PCrNi3MoVA / 40Cr steel heterogeneous component is as follows: Figure 1 As shown, the failure part of the heterogeneous component is processed by turning to remove the brittle intermetallic compound part and the fatigue layer, and the grooves are processed on both sides of the heterogeneous material to form a double-sided 60° V-shaped groove. The oil and oxide scale on the groove surface are removed by sodium hydroxide alkaline washing and hydrochloric acid pickling. After the oil and oxide scale are removed, the surface is dried at a temperature of 100°C.

[0033] (2) The design failed PCrNi3MoVA / 40Cr steel heterogeneous component rotary arc remanufacturing filling material is manufactured using Ф1.6 NiCrCo twisted wire. The wire is made of 6 Ni-Cr alloy wires (Ni content accounts for 80%, Cr content accounts for 20%) and 1 Co wire twisted by a special twisting equipment. The Co wire is placed in the center. The Co wire has good elasticity and is not easy to twist together. The twist distance is 12 mm, the diameter of each single wire is 0.5 mm, and the purity is not less than 99.9%. The molar percentages of the three elements Ni, Cr, and Co are 66.72%, 16.71%, and 16.57%, respectively.

[0034] (3) The PCrNi3MoVA / 40Cr steel heterogeneous component to be remanufactured is preheated at a temperature of 280°C, and the preheated PCrNi3MoVA / 40Cr steel heterogeneous component is fixed on a workbench.

[0035] (4) The preheated PCrNi3MoVA / 40Cr steel heterogeneous components were remanufactured by arc cladding using the offset tungsten electrode TIG rotating arc process. The TIG rotating arc process parameters were current 200A, filling speed 130mm / min, wire feeding speed 16mm / s, argon gas flow 25L / min, and rotation speed 200 rpm. Before arc forming remanufacturing, the forming trajectory was drawn and imported into the computer. At the same time, the water cooling system switch and gas protection switch were turned on. After the tungsten electrode was rotated and the wire feeding mechanism switch was turned on, the groove filling and forming were completed under computer control. The automatic cladding forming and filling weld formation was uniform, stable, and efficient. During the cladding filling and remanufacturing process, the molten pool state should be carefully observed. At the end of the filling and forming, the wire feeding mechanism was turned off first and then the arc was extinguished, and the water cooling protection and gas protection were turned off after a delay of 300 seconds. The offset tungsten electrode diameter was 3mm and the eccentricity was 0.75mm.

[0036] (5) The remanufactured PCrNi3MoVA / 40Cr steel heterogeneous components were tempered at a temperature of 450 °C and a tempering holding time of 4 h.

[0037] The remanufactured PCrNi3MoVA / 40Cr steel heterogeneous components have a tensile strength of 647.2 MPa and an elongation of 10.18%, and have excellent impact resistance with an impact energy of 50.29 J.

[0038] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A method for remanufacturing a failed heterogeneous structural component, characterized in that: The remanufacturing method includes: melting the remanufacturing filling material with the matrix elements of the heterogeneous structural component at the failure site of the heterogeneous structural component to form a medium-entropy alloy molten pool in situ, and forming a medium-entropy alloy joint when the medium-entropy alloy molten pool solidifies to complete the repair of the failed heterogeneous structural component, wherein the remanufacturing filling material is a non-high-entropy alloy material.

2. A method for remanufacturing a failed heterogeneous structural component according to claim 1, characterized in that: The remanufactured filling material contains at least two matrix elements of heterogeneous structural parts.

3. A method for remanufacturing a failed heterogeneous structural component according to claim 2, characterized in that: The remanufactured filling material comprises at least three metal elements, and the total amount of the metal elements in the remanufactured filling material that are the same as the matrix elements accounts for 75-90% of the total amount of the metal elements in the remanufactured filling material in terms of molar percentage.

4. The method for remanufacturing a failed heterogeneous structural component according to claim 1, characterized in that: The heterogeneous structural part is a PCrNi3MoVA / 40Cr steel heterogeneous component, and the remanufactured filling material is a NiCrCo twisted wire.

5. The method for remanufacturing a failed heterogeneous structural component according to claim 4, characterized in that: In terms of molar percentage, the Ni element in the NiCrCo stranded wire is 65-70%, the Cr element is 15-20%, and the Co element is 14-18%.

6. A method for remanufacturing a failed heterogeneous structural component according to claim 4 or 5, characterized in that: In terms of molar percentage, the Ni element in the NiCrCo stranded wire is 66.72%, the Cr element is 16.71%, and the Co element is 16.57%.

7. The method for remanufacturing a failed heterogeneous structural component according to claim 1, characterized in that: The heterogeneous structural component is pre-processed before being melted with the remanufactured filling material, and the pre-processing includes performing groove processing on the failed part of the heterogeneous structural component.

8. The method for remanufacturing a failed heterogeneous structural component according to claim 7, characterized in that: The beveling angle range of the beveling processing is 45°-120°.

9. The method for remanufacturing a failed heterogeneous structural component according to claim 1, characterized in that: The remanufactured filler material is interfused with the matrix elements of the heterogeneous structural component through a rotary arc forming process.

10. The method for remanufacturing a failed heterogeneous structural component according to claim 9, characterized in that: After the rotary arc forming process, tempering treatment is carried out.

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