Preparation method and application of complex-structure high-temperature alloy workpiece easy to detect flaws

Abstract

The invention belongs to the technical field of powder metallurgy, and relates to a preparation method and application of a complex-structure high-temperature alloy workpiece easy to detect flaw.The preparation method comprises the steps that coarse powder and fine powder are mixed to serve as a raw material, the mixed powder is pre-pressed through cold isostatic pressing to obtain a formed ingot blank, and the formed ingot blank is loaded into a steel ladle sleeve; the method comprises the following steps: filling gaps of a steel ladle sleeve with low-carbon steel powder, carrying out degassing seal welding treatment on the whole steel ladle sleeve, carrying out hot isostatic pressing treatment to obtain a strip steel ladle sleeve workpiece, carrying out heat treatment and machining treatment to obtain a strip steel workpiece, carrying out ultrasonic flaw detection on the strip steel workpiece, and carrying out acid pickling and sand blasting treatment to obtain a target high-temperature alloy workpiece. The high-temperature alloy part prepared through the method is high in tissue densification degree and good in grain uniformity; by means of the preparation method, the flaw detection difficulty of the high-temperature alloy workpiece of a complex structure can be remarkably reduced, the flaw detection accuracy is improved, and the problem that the high-temperature alloy workpiece is difficult to machine is effectively solved.

Description

Technical Field

[0001] The invention belongs to the technical field of powder metallurgy, and relates to a preparation method and application of a high-temperature alloy product with a complex structure that is easy to detect. Background Art

[0002] Complex high-performance parts for aircraft engines are usually made of nickel-based high-temperature alloys, and common processing methods include casting and forging. Traditional precision-cast parts generally have poor metallurgical quality, uneven structure, and low mechanical properties. For parts with complex shapes, they are prone to deformation and difficult to control dimensions. The forging method is difficult to achieve the overall forming of complex structural parts and the mold production cost is high, making it difficult to meet application requirements. Hot isostatic pressing technology has become an emerging technology for manufacturing important engine parts due to its many advantages such as high material utilization, uniform structure of formed parts, and direct forming of complex structural parts.

[0003] However, hot isostatic pressing usually requires medium-sized powders of 53μm~150μm as raw materials, which will make the fine powder and coarse powder produced by the powder making process unusable, and the production cost of parts is relatively high; at the same time, the processing of complex structure metal sheaths is difficult and costly, which further increases the manufacturing cost of parts. In addition, after the manufacture of high-temperature alloy parts for aircraft engines is completed, ultrasonic water immersion testing is usually required before delivery to ensure that there are no large-sized inclusions inside the parts. However, the difficulty of flaw detection for irregular components with complex shapes is relatively large, mainly manifested in:

[0004] (1) During the flaw detection process, the distance and angle between the probe and the workpiece surface are difficult to accurately control, and it is impossible to ensure that the probe can accurately reach all positions of the workpiece, which greatly increases the difficulty and cost of flaw detection; (2) It is impossible to accurately locate and evaluate the internal defects of complex components, which will make it difficult to ensure the accuracy and precision of its detection. In addition, although hot isostatic pressing technology can achieve the overall forming of complex parts, due to the blind area of ​​about 3mm in ultrasonic water immersion flaw detection, the parts need to be further machined after the flaw detection is completed to remove the blind area on the part surface. The machining difficulty is also relatively large, and it is difficult to ensure the final forming accuracy of the parts.

[0005] In view of this, this invention is proposed. Summary of the invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and to propose a method for preparing a complex structure high-temperature alloy part that is easy to detect and its application, so as to solve the problems of high manufacturing cost, low material utilization rate, great difficulty in ultrasonic flaw detection and poor forming accuracy of complex structure high-temperature alloy parts for aircraft engines.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions: In one aspect, the present invention provides a method for preparing a high-temperature alloy part with a complex structure that is easy to detect, comprising the following steps: Step 1, weighing high-temperature alloy powders with a particle size range of 15 μm to 53 μm and 150 μm to 212 μm according to a set ratio and putting them into a mixing device for mixing to obtain a mixed powder; Step 2, the mixed powder obtained in step 1 is loaded into a prefabricated rubber sheath, the rubber sheath is first vacuum-sealed, and then the entire rubber sheath is cold isostatically pressed to obtain a formed ingot; Step 3, placing the formed ingot obtained in step 2 into a prefabricated steel ladle sleeve for assembly, first filling the gap between the steel ladle sleeve and the formed ingot with low carbon steel powder, then performing a degassing and sealing welding treatment on the entire steel ladle sleeve, and then performing a hot isostatic pressing treatment to obtain a steel ladle sleeve-equipped part; Step 4, heat treating the steel jacketed product obtained in step 3; Step 5, machining the steel strip jacketed product after the heat treatment in step 4 to remove the outer surface oxide layer and retain at least 3 mm of the steel layer to obtain a steel strip product with a surface roughness Ra≤1.6 μm; Step 6, performing flaw detection on the strip steel product obtained in step 5; Step 7, pickling the strip steel part after the flaw detection in step 6 to remove the steel layer on the outer surface of the strip steel part, and then sandblasting to obtain the target high-temperature alloy part.

[0008] Furthermore, in step 1, high-temperature alloy powders with a particle size range of 15 μm~53 μm and 150 μm~212 μm are weighed at a mass ratio of 2~4:1~2 and put into a mixer. During mixing, the speed of the mixer is set to 60 r / min~150 r / min, and the mixing time is set to 20 min~60 min.

[0009] Furthermore, in step 2, the rubber sheath is designed according to the specifications of the target high-temperature alloy part, the mixed powder is first loaded into the rubber sheath and vibrated, and then vacuum-sealed, and the density of the mixed powder after vibration is ≥35%.

[0010] Further, in step 2, the cold isostatic pressing treatment includes the following two stages: The first stage: the pressure increase rate is set to 8MPa / min~10MPa / min, the pressure increase end point pressure is set to 130MPa~160MPa, and the pressure holding time is set to 8min~20min; The second stage: the pressure increase rate is set to 3MPa / min~6MPa / min, the pressure increase end pressure is set to 180MPa~220MPa, and the pressure holding time is set to 25min~60min.

[0011] Furthermore, in step 3, the formed ingot and the steel ladle sleeve are clearance-matched, the clearance is ≥3 mm, the steel ladle sleeve is made of 20 steel or 45 steel, and the wall thickness is 4 mm to 6 mm; The specific process of assembling the formed ingot into the steel ladle is as follows: first, the bottom plate and the outer ring of the steel ladle are welded by argon arc welding, low-carbon steel powder with a layer thickness of 3 mm to 4 mm is loaded into the bottom of the steel ladle and then vibrated, then, the formed ingot is placed in the steel ladle, ensuring that the center of the formed ingot is consistent with the center of the steel ladle, the top plate and the ladle mouth are welded by argon arc welding, the gap between the steel ladle and the formed ingot is filled with low-carbon steel powder and vibrated, and the density of the low-carbon steel powder after vibration is ≥68%, and finally, the degassing pipe is welded; The low carbon steel powder is 20 steel powder or 45 steel powder, and the particle size range is 150 μm to 212 μm.

[0012] Furthermore, in step 3, the heating temperature of the degassing and sealing treatment is 400°C to 480°C, the holding time is 2h to 6h, and the vacuum degree in the entire ladle jacket after the degassing and sealing treatment is 1.0x10 -4 Pa~1.0x10 -3 Pa, after the degassing and sealing welding process is completed, the degassing pipe is clamped and sealed.

[0013] Furthermore, in step 3, the temperature of the hot isostatic pressing treatment is 1180°C to 1240°C, the pressure is 130MPa to 170MPa, the holding time is 2h to 4h, and the hot isostatic pressing treatment is completed and cooled with the furnace. The density of the strip steel jacket product after the hot isostatic pressing treatment is ≥99.8%.

[0014] Furthermore, in step 4, the heat treatment system is: the solution temperature is 980°C~1250°C, the holding time is 1h~2h, and the cooling method is air cooling; the aging temperature is 700°C~870°C, the holding time is 4h~20h, and the cooling method is air cooling.

[0015] Furthermore, in step 6, the detection frequency of the flaw detection is 8 MHz to 12 MHz.

[0016] On the other hand, the present invention also provides an application of a method for preparing a complex structure high-temperature alloy part that is easy to detect, and an application of the method for preparing a complex structure high-temperature alloy part that is easy to detect in the preparation of GH4099 alloy parts, GH4169 alloy parts or MAR M247 alloy parts.

[0017] Compared with the prior art, the present invention has the following beneficial effects: (1) The present invention uses a mixed powder of coarse powder (particle size range: 150μm~212μm) and fine powder (particle size range: 15μm~53μm) prepared by a plasma rotating electrode method as raw material, which can achieve the purpose of reducing raw material costs and destocking; at the same time, the use of a mixture of coarse and fine powders can effectively fill the gaps between particles and promote the close packing of powders, thereby improving the density of the material after hot isostatic pressing; in addition, by setting a suitable ratio of coarse powder to fine powder, the organizational structure can be significantly optimized to obtain an excellent organization with uniform and fine grains; (2) The present invention uses cold isostatic pressing to pre-press the mixed powder, so that the powder particles can be rearranged, broken and form a strong mechanical meshing, which is beneficial to improving the density, molding quality and mechanical properties of the parts after hot isostatic pressing. At the same time, since the high-temperature alloy prepared by the present invention has a uniform and fine grain structure, it is not easy to generate noise during ultrasonic flaw detection, which can significantly improve the accuracy of detection; (3) In the present invention, only a steel ladle with a clearance matching the ingot size needs to be designed, and there is no need to prepare a metal ladle with a complex shape, which can reduce the difficulty and cost of ladle production. In addition, by adding low-carbon steel powder to convert the complex shape into a simple cylindrical shape, the difficulty of flaw detection of the workpiece is greatly reduced, and the material utilization rate of the formed workpiece can be significantly improved. (4) After ultrasonic flaw detection, the parts prepared by the present invention can be directly processed by pickling and sandblasting to obtain high-temperature alloy parts with complex structures with high surface quality and near-net shape, which effectively solves the problem of difficult machining of high-temperature alloy parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0019] 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, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0020] Figure 1 A flow chart of a method for preparing a complex structure high-temperature alloy part that is easy to detect provided by the present invention; Figure 2 The metallographic structure diagram of the GH4169 alloy product prepared by Example 1 of the present invention; Figure 3 The metallographic structure diagram of the MAR M247 alloy product prepared by Example 2 of the present invention; Figure 4 The metallographic structure diagram of the GH4099 alloy product prepared by Example 3 of the present invention. DETAILED DESCRIPTION

[0021] Here, exemplary embodiments will be described in detail, and the embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are only examples consistent with some aspects of the present invention described in detail in the appended claims.

[0022] The present invention provides a method for preparing a high-temperature alloy part with a complex structure that is easy to detect. Figure 1 As shown, the following steps are included: Step 1. After weighing high-temperature alloy spherical powders with a particle size range of 15μm~53μm and 150μm~212μm at a mass ratio of 2~4:1~2, put them into a mixer for mixing to obtain mixed powder. During mixing, the speed of the mixer is set to 60r / min~150r / min, and the mixing time is set to 20min~60min.

[0023] Step 2: design a rubber sheath according to the shape and size of the target high-temperature alloy part, put the mixed powder obtained in step 1 into the rubber sheath and vibrate it, then perform vacuum plastic sealing, the density of the mixed powder after vibration is ≥35%, and then the entire rubber sheath is cold isostatically pressed to obtain a formed ingot.

[0024] Specifically, the cold isostatic pressing process includes the following two stages: The first stage: the pressure increase rate is set to 8MPa / min~10MPa / min, the pressure increase end point pressure is set to 130MPa~160MPa, and the pressure holding time is set to 8min~20min; The second stage: the pressure increase rate is set to 3MPa / min~6MPa / min, the pressure increase end pressure is set to 180MPa~220MPa, and the pressure holding time is set to 25min~60min.

[0025] Step 3: First, design a 20 steel or 45 steel ladle sleeve with a wall thickness of 4mm~6mm and a clearance of not less than 3mm in all directions with the characteristic dimensions of the formed ingot according to the size of the formed ingot. Then, place the formed ingot obtained in step 2 into the prefabricated ladle sleeve for assembly, and fill the gap between the formed ingot and the ladle sleeve with low carbon steel powder, then degas and seal the entire ladle sleeve, and finally, perform hot isostatic pressing on the ladle sleeve to obtain a component with a steel ladle sleeve.

[0026] Specifically, the shaped ingot is placed in the steel ladle for assembly. The specific process is as follows: first, the bottom plate and outer ring of the steel ladle are welded by argon arc welding, low-carbon steel powder with a layer thickness of 3mm to 4mm is loaded into the bottom of the steel ladle and then vibrated, then the shaped ingot is placed in the steel ladle, ensuring that the center of the shaped ingot is consistent with the center of the steel ladle, the top plate and the ladle nozzle are welded by argon arc welding, and low-carbon steel powder is used to fill the internal gap of the steel ladle and vibrate, and the density of the low-carbon steel powder after vibration is ≥68%, and finally, the degassing pipe is welded. A circular hole with a diameter of 20mm is left at the top plate of the ladle for welding the ladle nozzle and the degassing pipe for powder loading, and the low-carbon steel powder is 20 steel powder or 45 steel powder, with a particle size range of 150μm to 212μm.

[0027] Specifically, the heating temperature of the degassing and sealing treatment is 400℃~480℃, the holding time is 2h~6h, and the vacuum degree in the entire ladle jacket after the degassing and sealing treatment is 1.0x10 -4 Pa~1.0x10 -3 Pa, after the degassing and sealing welding process is completed, the degassing pipe is clamped and sealed twice.

[0028] Specifically, the temperature of the hot isostatic pressing treatment is 1180°C to 1240°C, the pressure is 130MPa to 170MPa, the holding time is 2h to 4h, and the hot isostatic pressing treatment is completed and cooled with the furnace. The density of the steel jacketed product after the hot isostatic pressing treatment is ≥99.8%, and the shape of the steel jacketed product is cylindrical.

[0029] Step 4, heat treating the steel-sheathed component obtained in step 3, wherein the solution temperature is 980°C to 1250°C, the holding time is 1h to 2h, and the cooling method is air cooling; the aging temperature is 700°C to 870°C, the holding time is 4h to 20h, and the cooling method is air cooling.

[0030] Step 5: Machining the steel strip sheathed product after the heat treatment in step 4 to remove the outer surface oxide layer and retain at least 3 mm of the steel layer to obtain a steel strip product with a surface roughness Ra≤1.6 μm.

[0031] Step 6: Perform flaw detection on the steel strip obtained in step 5, preferably ultrasonic water immersion flaw detection, wherein the flaw detection frequency is 8 MHz to 12 MHz.

[0032] Step 7, pickling the strip steel part after the flaw detection in step 6 to remove the steel layer on the outer surface of the strip steel part, and then sandblasting to obtain the target high-temperature alloy part.

[0033] Specifically, when the strip steel part is pickled, the volume ratio of HF, HNO3 and H2O in the pickling solution is 1:3:6.

[0034] According to an embodiment of the present invention, the preparation method of the present invention is used to prepare high-temperature alloy parts with various complex structures.

[0035] In order to verify the beneficial effects of the preparation method of the present invention, the following examples are provided to further illustrate the effects. Example 1

[0036] This embodiment provides a method for preparing a complex structure GH4169 high temperature alloy part that is easy to detect, which specifically includes the following steps: Step 1. After weighing high-temperature alloy spherical powders with a particle size range of 15μm~53μm and 150μm~212μm in a mass ratio of 2:1, put them into a mixer for mixing to obtain mixed powder. During mixing, the speed of the mixer is set to 60r / min and the mixing time is set to 60min.

[0037] Step 2: design a rubber sheath according to the shape and size of the final high-temperature alloy part, put the mixed powder obtained in step 1 into the sheath, vibrate it, and then vacuum seal it. The density of the mixed powder after vibration is ≥35%, and then the entire rubber sheath is cold isostatically pressed to obtain a formed ingot after demolding.

[0038] Specifically, the cold isostatic pressing process includes the following two stages: The first stage: the pressure increase rate is set to 8MPa / min, the pressure increase end pressure is set to 130MPa, and the pressure holding time is set to 20min; The second stage: the pressure increase rate is set to 3MPa / min, the pressure increase end pressure is set to 180MPa, and the pressure holding time is set to 25min.

[0039] Step 3. According to the size of the formed ingot, design a 20 steel ladle with a wall thickness of 4 mm and a clearance of not less than 3 mm in all directions with the characteristic size of the formed ingot. Put the formed ingot obtained in step 2 into the steel ladle for assembly, and fill the gap with low-carbon steel powder. Then, the entire steel ladle is degassed and sealed, and then hot isostatically pressed to obtain a component with a steel ladle.

[0040] Specifically, the shaped ingot is placed in the steel ladle for assembly. The specific process is as follows: first, the bottom plate and outer ring of the steel ladle are welded by argon arc welding, and low-carbon steel powder with a layer thickness of 3mm to 4mm is loaded into the bottom of the steel ladle and vibrated. Then, the shaped ingot is placed in the steel ladle, ensuring that the center of the shaped ingot is consistent with the center of the steel ladle, and the top plate and the ladle nozzle of the steel ladle are welded by argon arc welding. Low-carbon steel powder is used to fill the internal gap of the steel ladle and vibrate. The density of the low-carbon steel powder after vibration is ≥68%, and finally the degassing pipe is welded. A circular hole with a diameter of 20mm is left at the top plate of the ladle for welding the ladle nozzle and the degassing pipe for powder loading. The low-carbon steel powder is 20 steel powder with a particle size range of 150μm to 212μm.

[0041] Specifically, the heating temperature of the degassing and sealing treatment is 400°C, the holding time is 6 hours, and the vacuum degree in the entire ladle jacket after the degassing and sealing treatment is 5.1x10 -4 Pa, after the degassing and sealing welding process is completed, the degassing pipe is clamped and sealed twice.

[0042] Specifically, the temperature of the hot isostatic pressing treatment is 1180° C., the pressure is 170 MPa, the holding time is 3 hours, and the hot isostatic pressing treatment is completed and cooled with the furnace.

[0043] Step 4: heat-treating the steel-sheathed product obtained in step 3, wherein the solution temperature is 980°C, the holding time is 2 hours, and the cooling method is air cooling; the aging temperature is 700°C, the holding time is 10 hours, and the cooling method is air cooling.

[0044] Step 5: Machining the steel strip jacketed product after the heat treatment in step 4 to remove the outer surface oxide layer and retain at least 3 mm of the steel layer to obtain a cylindrical steel strip product with a surface roughness Ra≤1.6 μm.

[0045] Step 6: Perform ultrasonic water immersion flaw detection on the steel strip obtained in step 5, wherein the detection frequency is 8 MHz.

[0046] Step 7: Pickle the strip steel product after flaw detection in step 6 to remove the steel layer on the outer surface of the strip steel product, wherein the volume ratio of HF, HNO3 and H2O in the pickling solution is 1:3:6, and the GH4169 high temperature alloy product with complex structure is obtained by sandblasting. Figure 2 shown. Example 2

[0047] This embodiment provides a method for preparing a complex structure MAR M247 high temperature alloy part that is easy to detect, which specifically includes the following steps: Step 1. After weighing high-temperature alloy spherical powders with a particle size range of 15μm~53μm and 150μm~212μm at a mass ratio of 2:1, put them into a mixer for mixing to obtain mixed powder. During mixing, the speed of the mixer is set to 90r / min and the mixing time is set to 40min.

[0048] Step 2: design a rubber sheath according to the shape and size of the final high-temperature alloy part; put the mixed powder obtained in step 1 into the rubber sheath and vibrate it, then perform vacuum plastic sealing; the density of the mixed powder after vibration is ≥35%; then perform cold isostatic pressing on the entire rubber sheath to obtain a formed ingot.

[0049] Specifically, the cold isostatic pressing process includes the following two stages: The first stage: the pressure increase rate is set to 9MPa / min, the pressure increase end pressure is set to 145MPa, and the pressure holding time is set to 12min; The second stage: the pressure increase rate is set to 5 MPa / min, the pressure increase end pressure is set to 200 MPa, and the pressure holding time is set to 40 min.

[0050] Step 3. According to the size of the formed ingot, design a 45 steel ladle with a wall thickness of 5 mm and a clearance of not less than 3 mm in all directions with the characteristic size of the formed ingot. Put the formed ingot obtained in step 2 into the steel ladle for assembly, and fill the gap with low-carbon steel powder. Then, the entire steel ladle is degassed and sealed, and then hot isostatically pressed to obtain a part with a steel ladle.

[0051] Specifically, the specific process of putting the formed ingot into the steel ladle for assembly is: first, the bottom plate and outer ring of the steel ladle are welded by argon arc welding, low-carbon steel powder with a layer thickness of 3mm~4mm is loaded into the bottom of the steel ladle and then vibrated, then, the formed ingot is placed in the steel ladle, ensuring that the center of the formed ingot is consistent with the center of the steel ladle, the top plate and the ladle nozzle of the steel ladle are welded by argon arc welding, and the internal gap of the steel ladle is filled with low-carbon steel powder and vibrated, and the density of the low-carbon steel powder after vibration is ≥68%, and finally the degassing pipe is welded. A circular hole with a diameter of 20mm is left at the top plate of the ladle for welding the ladle nozzle and the degassing pipe for powder filling, and the low-carbon steel powder is 45 steel powder with a particle size range of 150μm~212μm.

[0052] Specifically, the heating temperature of the degassing and sealing treatment is 440°C, the holding time is 4h, and the vacuum degree in the entire ladle jacket after the degassing and sealing treatment is 3.7x10 -4 Pa, after the degassing and sealing welding process is completed, the degassing pipe is clamped and sealed twice.

[0053] Specifically, the temperature of the hot isostatic pressing treatment is 1200° C., the pressure is 150 MPa, the holding time is 4 hours, and the hot isostatic pressing treatment is completed and cooled with the furnace.

[0054] Step 4: heat-treat the steel-sheathed component obtained in step 3, wherein the solution temperature is 1250°C, the holding time is 1.5h, and the cooling method is air cooling; the aging temperature is 870°C, the holding time is 20h, and the cooling method is air cooling.

[0055] Step 5: Machining the steel strip jacketed product after the heat treatment in step 4 to remove the outer surface oxide layer and retain at least 3 mm of the steel layer to obtain a cylindrical steel strip product with a surface roughness Ra≤1.6 μm.

[0056] Step 6: Perform ultrasonic water immersion flaw detection on the steel strip obtained in step 5, wherein the detection frequency is 10 MHz.

[0057] Step 7: Pickle the strip steel product after flaw detection in step 6 to remove the steel layer on the outer surface of the strip steel product, wherein the volume ratio of HF, HNO3 and H2O in the pickling solution is 1:3:6, and a MAR M247 high temperature alloy product with a complex structure is obtained by sandblasting. Figure 3 shown. Example 3

[0058] This embodiment provides a method for preparing a GH4099 high temperature alloy part with a complex structure that is easy to detect, which specifically includes the following steps: Step 1. After weighing high-temperature alloy spherical powders with a particle size range of 15μm~53μm and 150μm~212μm at a mass ratio of 2:1, put them into a mixer for mixing to obtain mixed powder. During mixing, the speed of the mixer is set to 150r / min and the mixing time is set to 20min.

[0059] Step 2: design a rubber sheath according to the shape and size of the final high-temperature alloy part; put the mixed powder obtained in step 1 into the rubber sheath and vibrate it, then perform vacuum plastic sealing; the density of the mixed powder after vibration is ≥35%; then perform cold isostatic pressing on the entire rubber sheath to obtain a formed ingot.

[0060] Specifically, the cold isostatic pressing process includes the following two stages: The first stage: the pressure increase rate is set to 10MPa / min, the pressure increase end pressure is set to 160MPa, and the pressure holding time is set to 8min; The second stage: the pressure increase rate is set to 6MPa / min, the pressure increase end pressure is set to 220MPa, and the pressure holding time is set to 60min.

[0061] Step 3. According to the size of the formed ingot, design a 20 steel ladle with a wall thickness of 6 mm and a clearance of not less than 3 mm in all directions with the characteristic size of the formed ingot. Put the formed ingot obtained in step 2 into the steel ladle for assembly, and fill the gap with low-carbon steel powder. Then, the entire steel ladle is degassed and sealed, and then hot isostatically pressed to obtain a component with a steel ladle.

[0062] Specifically, the specific process of putting the formed ingot into the steel ladle for assembly is: first, the bottom plate and outer ring of the steel ladle are welded by argon arc welding, low-carbon steel powder with a layer thickness of 3mm~4mm is loaded into the bottom of the steel ladle and then vibrated, then, the formed ingot is placed in the steel ladle, ensuring that the center of the formed ingot is consistent with the center of the steel ladle, the top plate and the ladle nozzle of the steel ladle are welded by argon arc welding, and the internal gap of the steel ladle is filled with low-carbon steel powder and vibrated, and the density of the low-carbon steel powder after vibration is ≥68%, and finally the degassing pipe is welded. A circular hole with a diameter of 20mm is left at the top plate of the ladle for welding the ladle nozzle and the degassing pipe for powder filling, and the low-carbon steel powder is 20 steel powder with a particle size range of 150μm~212μm.

[0063] Specifically, the heating temperature of the degassing and sealing treatment is 480°C, the holding time is 2h, and the vacuum degree in the entire ladle jacket after the degassing and sealing treatment is 4.2x10 -4 Pa, after the degassing and sealing welding process is completed, the degassing pipe is clamped and sealed twice.

[0064] Specifically, the temperature of the hot isostatic pressing treatment is 1240° C., the pressure is 130 MPa, the holding time is 2 h, and the hot isostatic pressing treatment is completed and cooled with the furnace.

[0065] Step 4: heat-treating the steel-sheathed product obtained in step 3, wherein the solution temperature is 1160°C, the holding time is 1h, and the cooling method is air cooling; the aging temperature is 850°C, the holding time is 4h, and the cooling method is air cooling.

[0066] Step 5: Machining the steel strip jacketed product after the heat treatment in step 4 to remove the outer surface oxide layer and retain at least 3 mm of the steel layer to obtain a cylindrical steel strip product with a surface roughness Ra≤1.6 μm.

[0067] Step 6: Perform ultrasonic water immersion flaw detection on the steel strip obtained in step 5, wherein the detection frequency is 12 MHz.

[0068] Step 7: Pickle the strip steel parts after flaw detection in step 6 to remove the steel layer on the outer surface of the strip steel parts. The volume ratio of HF, HNO3 and H2O in the pickling solution is 1:3:6. After sandblasting, a high-temperature GH4099 alloy part with a complex structure is obtained. Its metallographic structure is as follows Figure 4 shown.

[0069] Combination Figure 2~Figure 4 It can be seen that the preparation method provided by the present invention can be used to prepare high-temperature GH4169, MAR M247 and GH4099 alloy parts with near-net-shape complex structures. After inspection, the parts have dense structure and uniform grains. At the same time, the strip steel parts obtained by hot isostatic pressing during the preparation process are cylindrical, and the difficulty of flaw detection is low and the accuracy is high.

[0070] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0071] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for preparing a complex structure high temperature alloy part that is easy to detect, characterized in that: The steps include: Step 1, weighing high-temperature alloy powders with a particle size range of 15 μm to 53 μm and 150 μm to 212 μm according to a set ratio and putting them into a mixing device for mixing to obtain a mixed powder; Step 2, the mixed powder obtained in step 1 is loaded into a prefabricated rubber sheath, the rubber sheath is first vacuum-sealed, and then the entire rubber sheath is cold isostatically pressed to obtain a formed ingot; Step 3, placing the formed ingot obtained in step 2 into a prefabricated steel ladle sleeve for assembly, first filling the gap between the steel ladle sleeve and the formed ingot with low carbon steel powder, then performing a degassing and sealing welding treatment on the entire steel ladle sleeve, and then performing a hot isostatic pressing treatment to obtain a steel ladle sleeve-equipped part; Step 4, heat treating the steel jacketed product obtained in step 3; Step 5, machining the steel strip jacketed product after the heat treatment in step 4 to remove the outer surface oxide layer and retain at least 3 mm of the steel layer to obtain a steel strip product with a surface roughness Ra≤1.6 μm; Step 6, performing flaw detection on the strip steel product obtained in step 5; Step 7, pickling the strip steel part after the flaw detection in step 6 to remove the steel layer on the outer surface of the strip steel part, and then sandblasting to obtain the target high-temperature alloy part.

2. The method for preparing a complex structure high temperature alloy part that is easy to detect according to claim 1, characterized in that: In step S1, high-temperature alloy powders with a particle size range of 15 μm to 53 μm and 150 μm to 212 μm are weighed at a mass ratio of 2 to 4:1 to 2 and put into a mixer. During mixing, the speed of the mixer is set to 60 r / min to 150 r / min, and the mixing time is set to 20 min to 60 min.

3. The method for preparing a complex structure high temperature alloy part that is easy to detect according to claim 1, characterized in that: In step 2, the rubber sheath is designed according to the specifications of the target high-temperature alloy part, the mixed powder is first loaded into the rubber sheath and vibrated, and then vacuum-sealed, and the density of the mixed powder after vibration is ≥35%.

4. The method for preparing a complex structure high temperature alloy part that is easy to detect according to claim 1, characterized in that: In step 2, the cold isostatic pressing process includes the following two stages: The first stage: the pressure increase rate is set to 8MPa / min~10MPa / min, the pressure increase end point pressure is set to 130MPa~160MPa, and the pressure holding time is set to 8min~20min; The second stage: the pressure increase rate is set to 3MPa / min~6MPa / min, the pressure increase end pressure is set to 180MPa~220MPa, and the pressure holding time is set to 25min~60min.

5. The method for preparing a high-temperature alloy product with a complex structure that is easy to detect according to claim 1 is characterized in that: In step 3, the formed ingot and the steel ladle sleeve are clearance-matched, the clearance is ≥3mm, the steel ladle sleeve is made of 20 steel or 45 steel, and the wall thickness is 4mm~6mm; The specific process of assembling the formed ingot into the steel ladle is as follows: first, the bottom plate and the outer ring of the steel ladle are welded by argon arc welding, low-carbon steel powder with a layer thickness of 3 mm to 4 mm is loaded into the bottom of the steel ladle and then vibrated, then, the formed ingot is placed in the steel ladle, ensuring that the center of the formed ingot is consistent with the center of the steel ladle, the top plate and the ladle mouth are welded by argon arc welding, the gap between the steel ladle and the formed ingot is filled with low-carbon steel powder and vibrated, and the density of the low-carbon steel powder after vibration is ≥68%, and finally, the degassing pipe is welded; The low carbon steel powder is 20 steel powder or 45 steel powder, and the particle size range is 150 μm to 212 μm.

6. The method for preparing a complex structure high temperature alloy part that is easy to detect according to claim 1, characterized in that: In step 3, the heating temperature of the degassing and sealing treatment is 400°C to 480°C, the holding time is 2h to 6h, and the vacuum degree in the entire ladle jacket after the degassing and sealing treatment is 1.0x10 -4 Pa~1.0x10 -3 Pa, after the degassing and sealing welding process is completed, the degassing pipe is clamped and sealed.

7. The method for preparing a high-temperature alloy product with a complex structure that is easy to detect according to claim 1, characterized in that: In step 3, the temperature of the hot isostatic pressing treatment is 1180°C to 1240°C, the pressure is 130MPa to 170MPa, the holding time is 2h to 4h, and the hot isostatic pressing treatment is completed and cooled with the furnace. The density of the steel jacketed product after the hot isostatic pressing treatment is ≥99.8%.

8. The method for preparing a complex structure high temperature alloy part that is easy to detect according to claim 1, characterized in that: In step 4, the heat treatment system is: the solution temperature is 980°C to 1250°C, the holding time is 1h to 2h, and the cooling method is air cooling; the aging temperature is 700°C to 870°C, the holding time is 4h to 20h, and the cooling method is air cooling.

9. The method for preparing a high-temperature alloy product with a complex structure that is easy to detect according to claim 1, characterized in that: In step 6, the detection frequency of the flaw detection is 8 MHz to 12 MHz.

10. Application of a method for preparing a complex structure high temperature alloy part that is easy to detect, characterized in that: Application of the preparation method according to any one of claims 1 to 9 in the preparation of GH4099 alloy parts, GH4169 alloy parts or MAR M247 alloy parts.

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