Forging method of novel non-standard alloy material

Abstract

The invention discloses a novel non-standard alloy material forging method which comprises the following steps: S1, after an alloy material is pretreated, cutting the alloy material into a blank; s2, the blank in the step S1 is subjected to hot forging forming, and a needed workpiece is machined; s3, the workpiece in the step S2 is subjected to heat treatment, and a finished workpiece is obtained; in the step S2, the initial forging temperature is controlled within 1100 DEG C, and the final forging temperature is controlled within 900 DEG C. The process is relatively simple, the GH2437 alloy can be effectively forged, and the performance of a machined workpiece is relatively excellent.

Description

Technical Field

[0001] The present application relates to the technical field of alloy forging, and in particular to a forging method for a novel non-standard alloy material. Background Art

[0002] The forming process of metal materials is the most common processing technology in the industry. It is a process technology that processes metal materials into objects, parts, and components. Currently, the common forming methods of metal materials include machining, rolling, casting, forging, stamping and other processing methods.

[0003] For known alloy materials, the various properties of the alloys are known, and the processing characteristics are also recorded in the prior art. The molding and processing methods can refer to the records in the prior art. In particular, for commonly used alloy materials that are recorded in various standards, such alloy materials have been widely studied, and the best molding and processing methods are recorded in the standards. For new alloy materials that have not been recorded in the prior art, their alloy properties and processing characteristics are not recorded in the prior art, and the molding and processing of such alloy materials is relatively difficult.

[0004] GH2437 alloy is a new material. There is no record of forging production in China. Domestic steel mills have never smelted this metal material. There is no record of processing methods for this alloy material in the prior art. After testing, the alloy has high strength and relatively excellent performance. It can be used for processing various aircraft parts, and many parts need to be processed by forging. Since there is no record of processing methods for this alloy material in the prior art, it is difficult to forge parts using this alloy material. Summary of the invention

[0005] In order to solve at least one of the above technical problems, an alloy forging method is developed with relatively simple process, which can effectively forge GH2437 alloy and has relatively excellent performance of the processed workpiece. The present application provides a forging method for a new type of non-standard alloy material.

[0006] The present application provides a forging method for a novel non-standard alloy material, comprising the following steps: S1, cutting the alloy material into blanks after pretreatment; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece; In the step S2, the initial forging temperature is controlled within 1100°C, and the final forging temperature is controlled at 900°C.

[0007] Optionally, in step S1, the pretreatment includes cleaning the alloy material, removing the surface oxide layer and drying.

[0008] Optionally, in step S1, the cutting process is performed using a sawing machine.

[0009] Optionally, in step S2, the initial forging temperature is controlled at 1040-1080°C.

[0010] Further optionally, in step S2, the heating coefficient of the initial forging is 4 to 6 min / 10 mm.

[0011] Optionally, in step S2, the final forging temperature is controlled at 820-880°C.

[0012] Optionally, in step S2, the hot forging is performed using static pressure equipment.

[0013] Optionally, in step S3, the heat treatment adopts solution heat treatment, the temperature of the solution heat treatment is 920-980° C., the insulation time is 2-8 hours, and the solution heat treatment cooling adopts air cooling rapid cooling.

[0014] Further optionally, in step S3, the specific steps of the solution heat treatment are as follows: S3-1. Solution treatment is performed on the workpiece in a vacuum heat treatment furnace at a temperature of 920-960°C. After a holding time of 3-5 hours, an inert gas is introduced to cool the workpiece to room temperature. S3-2. Perform aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace. The aging treatment temperature is 500-560°C. After the insulation time is 2-4 hours, inert gas is introduced to cool to room temperature.

[0015] Further optionally, in step S3-1, the fan flow rate of the inert gas cooling is 9000~12000m 3 / h, the pressure in the furnace does not exceed 8 bar; in step S3-2, the fan flow rate of the inert gas cooling is 3000~6000m 3 / h, the pressure in the furnace does not exceed 10bar.

[0016] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The forging method of the present application adopts hot forging to forge the GH2437 alloy, and limits the initial forging temperature and the final forging temperature of the hot forging. The various properties of the alloy workpiece obtained by forging are relatively excellent, no abnormality occurs during the forging process, no cracks appear in the forging, and the plasticity of the workpiece is good.

[0017] 2. In the forging method of the present application, the grain size of the alloy is only level 4 at the beginning of forging, but after forging, the grain size of the alloy can reach level 7, and the grain size of the alloy has been significantly improved.

[0018] 3. This application effectively solves the industry problem that GH2437 alloy cannot be forged and processed at present, and provides an effective means for processing metal parts using this alloy material. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Photographs of the workpiece being processed; Figure 2 This is the electron microscope image of the comparative workpiece; Figure 3 This is an electron microscope image of the workpiece of the embodiment. DETAILED DESCRIPTION

[0020] The present application is further described in detail below with reference to the embodiments.

[0021] The present application discloses a forging method for a novel non-standard alloy material, comprising the following steps: S1, cutting the alloy material into blanks after pretreatment; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece; In the step S2, the initial forging temperature is controlled within 1100°C, and the final forging temperature is controlled within 900°C.

[0022] The present application is a forging method for GH2437 alloy. GH2437 alloy is a new alloy material, which is rarely recorded in the prior art, and its processing method is not recorded at all. GH2437 alloy is an alloy steel, and its element table is shown in Table 1 below, with the remainder being Fe.

[0023] Table 1 GH2437 alloy element table The inventor of the present application conducted relevant tests on the alloy and then designed the forging method of the present application through experimental research.

[0024] The following are examples of the present application: The blanks in the embodiment of the present application are processed using a sawing machine, and the hot forging is processed using a static pressure forging machine.

[0025] Example 1 The forging method of the novel non-standard alloy material of this embodiment comprises the following steps: S1, cutting the alloy material into blanks after cleaning, removing the surface oxide layer and drying; S2, hot forging the blank of step S1 to form a desired workpiece; S3, performing aging heat treatment on the workpiece of step S2 to eliminate processing stress and obtain a finished workpiece; the aging heat treatment is performed in a vacuum heat treatment furnace, the temperature of the aging heat treatment is controlled at 560-600°C, and after the heat preservation time is 4 hours, the furnace is cooled to room temperature.

[0026] In the step S2, the initial forging temperature is controlled at 1090-1100°C, and each forging process during the initial forging reduces the size of the blank by about 20%. After multiple forging processes, the size of the blank is within 1.2 times of the final workpiece size; the final forging temperature is controlled at 890-900°C, and the final forging adopts secondary forging; the heating coefficient of hot forging is 6-8min / 10mm.

[0027] Example 2 The difference between this embodiment and embodiment 1 is that in step S2, the initial forging temperature is controlled at 1040-1080° C., and the heating coefficient of the initial forging is 4-6 min / 10 mm.

[0028] Example 3 The difference between this embodiment and embodiment 2 is that in step S2, the final forging temperature is controlled at 820-880°C.

[0029] Example 4 The difference between this embodiment and embodiment 3 is that in step S3, the heat treatment adopts solution heat treatment, the solution heat treatment is carried out in a vacuum heat treatment furnace, the temperature of the solution heat treatment is controlled at 960-980°C, and after the insulation time is 8 hours, cold air is introduced for rapid cooling to room temperature.

[0030] Example 5 The difference between this embodiment and embodiment 3 is that in step S3, the heat treatment adopts solution heat treatment, the solution heat treatment is carried out in a vacuum heat treatment furnace, the temperature of the solution heat treatment is controlled at 920-940°C, and after the insulation time is 2h, cold air is introduced for rapid cooling to room temperature.

[0031] Example 6 The difference between this embodiment and embodiment 3 is that in step S3, the heat treatment adopts solution heat treatment, the solution heat treatment is carried out in a vacuum heat treatment furnace, the temperature of the solution heat treatment is controlled at 940-960°C, and after the insulation time is 5 hours, cold air is introduced for rapid cooling to room temperature.

[0032] Comparative Example This application uses GH2437 alloy raw material cutting parts as a comparative example.

[0033] The methods of Examples 1 to 6 of the present application were tested, with the alloys of the comparative examples being used as comparison objects.

[0034] The detection method is as follows: the methods of Examples 1 to 6 of the present application are used to prepare test workpieces with a size of 20×20×50 mm, and the comparative workpieces are also cut into the same size. Then, according to the alloy detection method recorded in the relevant national standards, the strength, toughness and hardness of the workpiece are tested. The specific test results are shown in Table 2 below.

[0035] Table 2 Test results of Examples 1 to 5 and Comparative Examples It can be seen from the above test results that the various properties of the forgings obtained by forging the GH2437 alloy using the forging method of the present application are significantly better than those of the original alloy raw material cut pieces. It can be seen that the forging method of the present application for processing the GH2437 alloy can significantly improve the performance of the processed workpiece.

[0036] 100 workpieces were processed using the methods of Examples 1 to 6 of the present application, and the workpieces were tested using ultrasonic flaw detection. After testing, most of the workpieces were intact without any cracks, and only a small number of workpieces had cracks. According to calculations, the intact rate of the workpieces processed by the methods of Examples 1 to 6 can only reach 85% to 90%.

[0037] The actual processing of a required workpiece, the workpiece after processing is as follows Figure 1 As shown in the photo. Figure 1 It can be seen that even if there is curvature on the workpiece surface, the processed workpiece is still intact.

[0038] The workpieces of the comparative example and Example 6 of the present application were examined by electron microscope, and the results obtained are as follows: Figure 2 and Figure 3 As shown. Figure 2 and Figure 3 It can be seen that after being processed using the method of Example 6, the grain size of the alloy material is significantly improved.

[0039] In order to effectively solve the problem of cracks in workpiece forging and to further improve the performance of the workpiece, the applicant conducted further experimental research on the heat treatment steps of the workpiece and designed a corresponding heat treatment method.

[0040] The optimized heat treatment steps in this application are as follows: S3-1. Solution treatment is performed on the workpiece in a vacuum heat treatment furnace at a temperature of 920-960°C. After a holding time of 3-5 hours, an inert gas is introduced to cool the workpiece to room temperature. S3-2. Perform aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace. The aging treatment temperature is 500-560°C. After the insulation time is 2-4 hours, inert gas is introduced to cool to room temperature.

[0041] In the heat treatment of the present application, argon can be selected as the inert gas.

[0042] The following are Examples 7 to 14 of the present application. Embodiments 7 to 14 of the present application are based on Embodiment 3 of the present application, and the only difference is the workpiece heat treatment part in step S3. Embodiments 7 to 14 of the present application all use a vacuum heat treatment furnace as the heat treatment equipment, and use argon as the inert gas.

[0043] Example 7 The workpiece is hot forged using steps S1 and S2 that are completely identical to the forging method for the new non-standard alloy material in Example 3.

[0044] The hot forging workpiece is subjected to solution heat treatment. The specific steps are as follows: S3-1. Solution treatment is performed on the workpiece in a vacuum heat treatment furnace at a temperature of 920-930°C. After a holding time of 5 hours, argon gas is introduced to cool the workpiece to room temperature. S3-2, performing aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace, the aging treatment temperature is 500-520°C, after the heat preservation time is 4h, argon gas is introduced to cool to room temperature; In step S3-1, the fan flow rate of the inert gas cooling is 8000-9000m 3 / h, control the furnace pressure not to exceed 8bar; in step S3-2, the fan flow rate of the inert gas cooling is 2500~3000m 3 / h, and control the pressure in the furnace not to exceed 10bar.

[0045] Example 8 The workpiece is hot forged by adopting steps S1 and S2 which are completely the same as those in the forging method of the new non-standard alloy material in Example 3.

[0046] The hot forging workpiece is subjected to solution heat treatment. The specific steps are as follows: S3-1. The workpiece is subjected to solution treatment in a vacuum heat treatment furnace at a temperature of 935-945°C. After a holding time of 4 hours, argon gas is introduced to cool the workpiece to room temperature. S3-2, performing aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace, the aging treatment temperature is 520~540℃, after the heat preservation time is 3h, argon gas is introduced to cool to room temperature; In step S3-1, the fan flow rate of the inert gas cooling is 8000-9000m 3 / h, control the furnace pressure not to exceed 8bar; in step S3-2, the fan flow rate of the inert gas cooling is 2500~3000m 3 / h, and control the pressure in the furnace not to exceed 10bar.

[0047] Example 9 The workpiece is hot forged by adopting steps S1 and S2 which are completely the same as those in the forging method of the new non-standard alloy material in Example 3.

[0048] The hot forging workpiece is subjected to solution heat treatment. The specific steps are as follows: S3-1. The workpiece is subjected to solution treatment in a vacuum heat treatment furnace at a temperature of 950-960°C. After a holding time of 3 hours, argon gas is introduced to cool the workpiece to room temperature. S3-2, performing aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace, the aging treatment temperature is 540~560℃, after the heat preservation time is 2h, argon gas is introduced to cool to room temperature; In step S3-1, the fan flow rate of the inert gas cooling is 8000-9000m 3 / h, control the furnace pressure not to exceed 8bar; in step S3-2, the fan flow rate of the inert gas cooling is 2500~3000m 3 / h, and control the pressure in the furnace not to exceed 10bar.

[0049] Example 10 The workpiece is hot forged by adopting steps S1 and S2 which are completely the same as those in the forging method of the new non-standard alloy material in Example 3.

[0050] The hot forging workpiece is subjected to solution heat treatment. The specific steps are as follows: S3-1. Solution treatment is performed on the workpiece in a vacuum heat treatment furnace at a temperature of 940-950°C. After a holding time of 3.5 hours, argon gas is introduced to cool the workpiece to room temperature. S3-2, performing aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace, the aging treatment temperature is 535~545℃, after the heat preservation time is 2.5h, argon gas is introduced to cool to room temperature; In step S3-1, the fan flow rate of the inert gas cooling is 8000-9000m 3 / h, control the furnace pressure not to exceed 8bar; in step S3-2, the fan flow rate of the inert gas cooling is 2500~3000m 3 / h, and control the pressure in the furnace not to exceed 10bar.

[0051] Embodiment 11 The workpiece is hot forged by adopting steps S1 and S2 which are completely the same as those in the forging method of the new non-standard alloy material in Example 3.

[0052] The hot forging workpiece is subjected to solution heat treatment. The specific steps are as follows: S3-1. Solution treatment is performed on the workpiece in a vacuum heat treatment furnace at a temperature of 940-950°C. After a holding time of 3.5 hours, argon gas is introduced to cool the workpiece to room temperature. S3-2, performing aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace, the aging treatment temperature is 535~545℃, after the heat preservation time is 2.5h, argon gas is introduced to cool to room temperature; In step S3-1, the fan flow rate of the inert gas cooling is 9000-10000m 3 / h, control the pressure in the furnace not to exceed 8 bar; in step S3-2, the flow rate of the fan for inert gas cooling is 3000~3500m 3 / h, and control the pressure in the furnace not to exceed 10bar.

[0053] Example 12 The workpiece is hot forged by adopting steps S1 and S2 which are completely the same as those in the forging method of the new non-standard alloy material in Example 3.

[0054] The hot forging workpiece is subjected to solution heat treatment. The specific steps are as follows: S3-1. Solution treatment is performed on the workpiece in a vacuum heat treatment furnace at a temperature of 940-950°C. After a holding time of 3.5 hours, argon gas is introduced to cool the workpiece to room temperature. S3-2, performing aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace, the aging treatment temperature is 535~545℃, after the heat preservation time is 2.5h, argon gas is introduced to cool to room temperature; In step S3-1, the fan flow rate of the inert gas cooling is 10000~11000m 3 / h, control the furnace pressure not to exceed 8bar; in step S3-2, the fan flow rate of the inert gas cooling is 4000~4500m 3 / h, and control the pressure in the furnace not to exceed 10bar.

[0055] Embodiment 13 The workpiece is hot forged by adopting steps S1 and S2 which are completely the same as those in the forging method of the new non-standard alloy material in Example 3.

[0056] The hot forging workpiece is subjected to solution heat treatment. The specific steps are as follows: S3-1. Solution treatment is performed on the workpiece in a vacuum heat treatment furnace at a temperature of 940-950°C. After a holding time of 3.5 hours, argon gas is introduced to cool the workpiece to room temperature. S3-2, performing aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace, the aging treatment temperature is 535~545℃, after the heat preservation time is 2.5h, argon gas is introduced to cool to room temperature; In step S3-1, the fan flow rate of the inert gas cooling is 11000~12000m 3 / h, control the furnace pressure not to exceed 8bar; in step S3-2, the fan flow rate of the inert gas cooling is 5500~6000m 3 / h, and control the pressure in the furnace not to exceed 10bar.

[0057] Embodiment 14 The workpiece is hot forged by adopting steps S1 and S2 which are completely the same as those in the forging method of the new non-standard alloy material in Example 3.

[0058] The hot forging workpiece is subjected to solution heat treatment. The specific steps are as follows: S3-1. Solution treatment is performed on the workpiece in a vacuum heat treatment furnace at a temperature of 940-950°C. After a holding time of 3.5 hours, argon gas is introduced to cool the workpiece to room temperature. S3-2, performing aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace, the aging treatment temperature is 535~545℃, after the heat preservation time is 2.5h, argon gas is introduced to cool to room temperature; In step S3-1, the fan flow rate of the inert gas cooling is 10000~11000m 3 / h, control the furnace pressure not to exceed 8bar; in step S3-2, the fan flow rate of the inert gas cooling is 4500~5000m 3 / h, and control the pressure in the furnace not to exceed 10bar.

[0059] Comparative Example 1 The method steps of this comparative example are basically the same as those of Example 14, except that the cooling parameters of the heat treatment are different.

[0060] In step S3-1 of this comparative example, the flow rate of the fan for cooling the inert gas is 7000-8000m 3 / h, control the furnace pressure not to exceed 8bar; in step S3-2, the fan flow rate of the inert gas cooling is 2000~2500m 3 / h, and control the pressure in the furnace not to exceed 10bar.

[0061] Comparative Example 2 The method steps of this comparative example are basically the same as those of Example 14, except that the cooling parameters of the heat treatment are different.

[0062] In step S3-1 of this comparative example, the flow rate of the fan for cooling the inert gas is 12000~13000m 3 / h, control the furnace pressure not to exceed 8bar; in step S3-2, the fan flow rate of the inert gas cooling is 6500~7000m 3 / h, and control the pressure in the furnace not to exceed 10bar.

[0063] Comparative Example 3 The method steps of this comparative example are basically the same as those of Example 14, except that the heating parameters of the heat treatment are different.

[0064] In this comparative example, the hot forging workpiece is subjected to solution heat treatment, and the specific steps are as follows: S3-1, the workpiece is subjected to solution treatment in a vacuum heat treatment furnace at a temperature of 880-900°C. After a holding time of 5 hours, argon gas is introduced to cool the workpiece to room temperature; S3-2. Perform aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace. The aging treatment temperature is 490~500℃. After the heat preservation time is 4h, argon gas is introduced to cool to room temperature.

[0065] Comparative Example 4 The method steps of this comparative example are basically the same as those of Example 14, except that the heating parameters of the heat treatment are different.

[0066] In this comparative example, the hot forging workpiece is subjected to solution heat treatment, and the specific steps are as follows: S3-1. The workpiece is subjected to solution treatment in a vacuum heat treatment furnace at a temperature of 980-990°C. After a holding time of 3 hours, argon gas is introduced to cool the workpiece to room temperature. S3-2. Perform aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace at a temperature of 560-570°C. After a holding time of 2 hours, argon gas is introduced to cool to room temperature.

[0067] Comparative Example 5 The method steps of this comparative example are basically the same as those of Example 14, except that the heating parameters of the heat treatment are different.

[0068] In this comparative example, the hot forging workpiece is subjected to solution heat treatment, and the specific steps are as follows: S3-1. Solution treatment is performed on the workpiece in a vacuum heat treatment furnace at a temperature of 940-950°C. After a holding time of 5.5 hours, argon gas is introduced to cool the workpiece to room temperature. S3-2. Perform aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace at a temperature of 535-545°C. After a holding time of 4.5 hours, argon gas is introduced to cool to room temperature.

[0069] The methods of Examples 7 to 14 of the present application and Comparative Examples 1 to 5 were tested.

[0070] The detection method is as follows: 100 test workpieces with a size of 20×20×50 mm are prepared using the methods of Examples 7 to 14 of the present application and Comparative Examples 1 to 5, respectively. The strength, toughness and crack rate of the workpieces during the preparation process are then tested, and the average values ​​of the strength and toughness tests are taken. The test results are shown in Table 3 below.

[0071] Table 3 Test results of Examples 7 to 14 and Comparative Examples 1 to 5 By comparing the data in Table 3 with the data in Table 2, the present application adopts a specially designed heat treatment step, and after the workpiece is subjected to solution and aging treatment, the various properties of the workpiece can be significantly improved. It can also be seen from the data in Table 3 that after the present application adopts specific heat treatment parameters, the intact rate of the workpiece processing can also be effectively improved, and the intact rate of the workpiece can reach more than 95%.

[0072] From the data in Table 3, it can be seen from the comparison of the data of Examples 7 to 14 with those of Comparative Examples 1 to 5 that the solution heat treatment temperature should not be too low or too high. A too low temperature will lead to a decrease in the heat treatment effect, while a too high temperature will not only lead to a decrease in the heat treatment effect, but also cause cracks in the workpiece.

[0073] After optimizing the heat treatment steps, the applicant also optimized the specific steps of hot forging to ensure that the workpiece has the best forming performance.

[0074] The specific steps of hot forging designed in this application are as follows: S2-1, initial forging and first heat: the temperature is controlled at 1040~1100℃, and the blank is drawn, upset and drawn in sequence to reduce the size of the blank by 5~10%; S2-2, Second forging: The temperature is controlled at 1040~1100℃, and the blank after the first forging is sequentially drawn, upset, and drawn to reduce the size of the blank by 10~15%; S2-3, the third forging: the temperature is controlled at 1040~1100℃, and the blank after the second forging is successively drawn, upset, and drawn to reduce the size of the blank by 10~15%; S2-4, Final forging: The temperature is controlled at 820~900℃, and the blank after the third tempering is forged into shape, and the size of the blank is reduced by more than 20%.

[0075] The following are Examples 15 to 21 of this application Embodiment 15 The forging method of the novel non-standard alloy material of this embodiment comprises the following steps: S1, cutting the alloy material into blanks after cleaning, removing the surface oxide layer and drying; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece.

[0076] The step S2 comprises the following specific steps: S2-1, initial forging and first heat: the temperature is controlled at 1040~1060℃, and the blank is drawn, upset and drawn in sequence to reduce the size of the blank by 5%; S2-2, Second forging: The temperature is controlled at 1040~1060℃, and the blank after the first forging is successively drawn, upset, and drawn to reduce the size of the blank by 10%; S2-3, the third forging: the temperature is controlled at 1040~1060℃, and the blank after the second forging is successively drawn, upset, and drawn to reduce the size of the blank by 10%; S2-4, Final forging: The temperature is controlled at 820~840℃, and the blank after the third tempering is forged into shape, and the size of the blank is reduced by more than 20%.

[0077] The step S3 adopts the same specific steps and parameters of the solution heat treatment as those of Example 14.

[0078] Example 16 The forging method of the novel non-standard alloy material of this embodiment comprises the following steps: S1, cutting the alloy material into blanks after cleaning, removing the surface oxide layer and drying; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece.

[0079] The step S2 comprises the following specific steps: S2-1, initial forging and first heat: the temperature is controlled at 1040~1060℃, and the blank is drawn, upset and drawn in sequence to reduce the size of the blank by 15%; S2-2, Second forging: The temperature is controlled at 1040~1060℃, and the blank after the first forging is successively drawn, upset, and drawn to reduce the size of the blank by 15%; S2-3, the third forging: the temperature is controlled at 1040~1060℃, and the blank after the second forging is successively drawn, upset, and drawn to reduce the size of the blank by 10%; S2-4, Final forging: The temperature is controlled at 820~840℃, and the blank after the third tempering is forged into shape, and the size of the blank is reduced by more than 20%.

[0080] The step S3 adopts the same specific steps and parameters of the solution heat treatment as those of Example 14.

[0081] Embodiment 17 The forging method of the novel non-standard alloy material of this embodiment comprises the following steps: S1, cutting the alloy material into blanks after cleaning, removing the surface oxide layer and drying; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece.

[0082] The step S2 comprises the following specific steps: S2-1, initial forging and first heat: the temperature is controlled at 1060~1080℃, and the blank is drawn, upset and drawn in sequence to reduce the size of the blank by 5%; S2-2, Second forging: The temperature is controlled at 1060~1080℃, and the blank after the first forging is successively drawn, upset, and drawn to reduce the size of the blank by 10%; S2-3, the third forging: the temperature is controlled at 1060~1080℃, and the blank after the second forging is successively drawn, upset, and drawn to reduce the size of the blank by 10%; S2-4, Final forging: The temperature is controlled at 840~860℃, and the blank after the third tempering is forged into shape, and the size of the blank is reduced by more than 20%.

[0083] The step S3 adopts the same specific steps and parameters of the solution heat treatment as those of Example 14.

[0084] Embodiment 18 The forging method of the novel non-standard alloy material of this embodiment comprises the following steps: S1, cutting the alloy material into blanks after cleaning, removing the surface oxide layer and drying; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece.

[0085] The step S2 comprises the following specific steps: S2-1, initial forging and first heat: the temperature is controlled at 1060~1080℃, and the blank is drawn, upset and drawn in sequence to reduce the size of the blank by 10%; S2-2, Second forging: The temperature is controlled at 1060~1080℃, and the blank after the first forging is successively drawn, upset, and drawn to reduce the size of the blank by 15%; S2-3, the third forging: the temperature is controlled at 1060~1080℃, and the blank after the second forging is successively drawn, upset, and drawn to reduce the size of the blank by 15%; S2-4, Final forging: The temperature is controlled at 840~860℃, and the blank after the third tempering is forged into shape, and the size of the blank is reduced by more than 20%.

[0086] The step S3 adopts the same specific steps and parameters of the solution heat treatment as those of Example 14.

[0087] Embodiment 19 The forging method of the novel non-standard alloy material of this embodiment comprises the following steps: S1, cutting the alloy material into blanks after cleaning, removing the surface oxide layer and drying; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece.

[0088] The step S2 comprises the following specific steps: S2-1, initial forging and first heat: the temperature is controlled at 1080~1090℃, and the blank is drawn, upset and drawn in sequence to reduce the size of the blank by 5%; S2-2, Second forging: The temperature is controlled at 1080~1090℃, and the blank after the first forging is successively drawn, upset, and drawn to reduce the size of the blank by 10%; S2-3, the third forging: the temperature is controlled at 1080~1090℃, and the blank after the second forging is successively drawn, upset, and drawn to reduce the size of the blank by 10%; S2-4, Final forging: The temperature is controlled at 880~890℃, and the blank after the third tempering is forged into shape, and the size of the blank is reduced by more than 20%.

[0089] The step S3 adopts the same specific steps and parameters of the solution heat treatment as those of Example 14.

[0090] Embodiment 20 The forging method of the novel non-standard alloy material of this embodiment comprises the following steps: S1, cutting the alloy material into blanks after cleaning, removing the surface oxide layer and drying; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece.

[0091] The step S2 comprises the following specific steps: S2-1, initial forging and first heat: the temperature is controlled at 1080~1090℃, and the blank is drawn, upset and drawn in sequence to reduce the size of the blank by 10%; S2-2, Second forging: The temperature is controlled at 1080~1090℃, and the blank after the first forging is successively drawn, upset, and drawn to reduce the size of the blank by 15%; S2-3, the third forging: the temperature is controlled at 1080~1090℃, and the blank after the second forging is successively drawn, upset, and drawn to reduce the size of the blank by 15%; S2-4, Final forging: The temperature is controlled at 880~890℃, and the blank after the third tempering is forged into shape, and the size of the blank is reduced by more than 20%.

[0092] The step S3 adopts the same specific steps and parameters of the solution heat treatment as those of Example 14.

[0093] Embodiment 21 The forging method of the novel non-standard alloy material of this embodiment comprises the following steps: S1, cutting the alloy material into blanks after cleaning, removing the surface oxide layer and drying; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece.

[0094] The step S2 comprises the following specific steps: S2-1, initial forging and first heat: the temperature is controlled at 1070~1080℃, and the blank is drawn, upset and drawn in sequence to reduce the size of the blank by 8%; S2-2, Second forging: The temperature is controlled at 1070~1080℃, and the blank after the first forging is successively drawn, upset, and drawn to reduce the size of the blank by 12%; S2-3, the third forging: the temperature is controlled at 1070~1080℃, and the blank after the second forging is successively drawn, upset, and drawn to reduce the size of the blank by 12%; S2-4, Final forging: The temperature is controlled at 870~880℃, and the blank after the third tempering is forged into shape, and the size of the blank is reduced by more than 20%.

[0095] The step S3 adopts the same specific steps and parameters of the solution heat treatment as those of Example 14.

[0096] Comparative Example 6 The forging method of the novel non-standard alloy material of this comparative example comprises the following steps: S1, cutting the alloy material into blanks after cleaning, removing the surface oxide layer and drying; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece.

[0097] The step S2 comprises the following specific steps: S2-1, initial forging and first heat: the temperature is controlled at 1070~1080℃, and the blank is drawn, upset and drawn in sequence to reduce the size of the blank by 14%; S2-2, Second forging: The temperature is controlled at 1070~1080℃, and the blank after the first forging is successively drawn, upset, and drawn to reduce the size of the blank by 18%; S2-3, Final forging: The temperature is controlled at 870~880℃, and the blank after the third tempering is forged into shape, and the size of the blank is reduced by more than 20%.

[0098] The step S3 adopts the same specific steps and parameters of the solution heat treatment as those of Example 14.

[0099] Comparative Example 7 The forging method of the novel non-standard alloy material of this comparative example comprises the following steps: S1, cutting the alloy material into blanks after cleaning, removing the surface oxide layer and drying; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece.

[0100] The step S2 comprises the following specific steps: S2-1. Initial forging and first heat: the temperature is controlled at 1070~1080℃, and the blank is drawn, upset and drawn in sequence to reduce the size of the blank by more than 20%; S2-2, Final forging: The temperature is controlled at 870~880℃, and the blank after the third tempering is forged into shape, and the size of the blank is reduced by more than 32%.

[0101] The step S3 adopts the same specific steps and parameters of the solution heat treatment as those of Example 14.

[0102] Comparative Example 8 The forging method of the novel non-standard alloy material of this comparative example comprises the following steps: S1, cutting the alloy material into blanks after cleaning, removing the surface oxide layer and drying; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece.

[0103] The step S2 comprises the following specific steps: S2-1, initial forging and first heat: the temperature is controlled at 1070~1080℃, and the blank is drawn, upset and drawn in sequence to reduce the size of the blank by 5%; S2-2, Second forging: The temperature is controlled at 1070~1080℃, and the blank after the first forging is successively drawn, upset, and drawn to reduce the size of the blank by 5%; S2-3, the third forging: the temperature is controlled at 1070~1080℃, and the blank after the second forging is successively drawn, upset, and drawn to reduce the size of the blank by 5%; S2-4, Final forging: The temperature is controlled at 870~880℃, and the blank after the third tempering is forged into shape, and the size of the blank is reduced by more than 40%.

[0104] The step S3 adopts the same specific steps and parameters of the solution heat treatment as those of Example 14.

[0105] The methods of Examples 15 to 22 of the present application and Comparative Examples 6 to 8 were tested.

[0106] The detection method is as follows: 100 test workpieces with a size of 20×20×50 mm are prepared using the methods of Examples 15 to 22 of the present application and Comparative Examples 6 to 8, respectively. The strength, toughness and crack rate of the workpieces during the preparation process are then tested, and the average values ​​of the strength and toughness tests are taken. The test results are shown in Table 4 below.

[0107] Table 4 Test results of Examples 15 to 22 and Comparative Examples 6 to 8 It can be seen from the data in Table 4 that after the hot forging forming step is specifically optimized in the present application, the various performances of the workpiece are slightly improved, and the workpiece integrity rate can reach 100%; while using other hot forging forming steps, even with the heat treatment step optimized in the present application, the workpiece integrity rate is difficult to reach 100%.

[0108] The applicant conducted a practical application experiment on the forging method of the present application, and the experiment adopted an optimized forging method.

[0109] The following is Example 22 of this application Example 22 is a forging method for actually preparing a prismatic workpiece with a regular octagonal cross-section (side length 8 mm) and a length of 700 mm after optimizing each step of the forging method in the present application.

[0110] Embodiment 22 The forging method of the novel non-standard alloy material of this embodiment comprises the following steps: S1. After cleaning, removing the surface oxide layer and drying the alloy material, the alloy material is cut into blanks. The blanks are rectangular parallelepipeds with a size of about 1.6 times that of the final workpiece. S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece.

[0111] The step S2 comprises the following specific steps: S2-1, initial forging and first heat: the temperature is controlled at 1070~1080℃, and the blank is drawn, upset and drawn in sequence to reduce the size of the blank by 8%; S2-2, Second forging: The temperature is controlled at 1070~1080℃, and the blank after the first forging is successively drawn, upset, and drawn to reduce the size of the blank by 12%; S2-3, the third forging: the temperature is controlled at 1070~1080℃, and the blank after the second forging is successively drawn, upset, and drawn to reduce the size of the blank by 12%; S2-4, final forging: the temperature is controlled at 870~880℃, and the blank after the third tempering is forged into shape.

[0112] The step S3 comprises the following specific steps: S3-1. Solution treatment is performed on the workpiece in a vacuum heat treatment furnace at a temperature of 940-950°C. After a holding time of 3.5 hours, argon gas is introduced to cool the workpiece to room temperature. S3-2, performing aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace, the aging treatment temperature is 535~545℃, after the heat preservation time is 2.5h, argon gas is introduced to cool to room temperature; In step S3-1, the fan flow rate of the inert gas cooling is 10000~11000m 3 / h, control the furnace pressure not to exceed 8bar; in step S3-2, the fan flow rate of the inert gas cooling is 4500~5000m 3 / h, and control the pressure in the furnace not to exceed 10bar.

[0113] Using the forging method of Example 22 of the present application, 100 workpieces were actually produced. The workpieces were subjected to ultrasonic flaw detection and all the workpieces were found to be free of any cracks.

[0114] Five workpieces were randomly selected for inspection of the above-mentioned workpieces, and various properties were tested. After taking the average value, the tensile strength of the workpieces exceeded 1090 MPa, the yield strength exceeded 725 MPa, the elongation exceeded 15.8%, and the impact energy exceeded 36 J, with performance far exceeding that of the original alloy material.

[0115] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A new forging method for non-standard alloy materials, characterized in that: The following steps are involved: S1, cutting and processing the alloy material into blanks after pretreatment; S2, hot forging the blank of step S1 to form a desired workpiece; S3, heat treating the workpiece of step S2 to obtain a finished workpiece; In the step S2, the initial forging temperature is controlled within 1100°C, and the final forging temperature is controlled within 900°C.

2. The forging method of the new non-standard alloy material according to claim 1 is characterized in that: In the step S1, the pretreatment includes cleaning the alloy material, removing the surface oxide layer and drying.

3. The forging method of the new non-standard alloy material according to claim 1 is characterized in that: In the step S1, the cutting process is performed using a sawing machine.

4. The forging method of the new non-standard alloy material according to claim 1 is characterized in that: In step S2, the initial forging temperature is controlled at 1040-1080°C.

5. The forging method of the new non-standard alloy material according to claim 4 is characterized in that: In the step S2, the heating coefficient of the initial forging is 4 to 6 min / 10 mm.

6. The forging method of the new non-standard alloy material according to claim 1 is characterized in that: In the step S2, the final forging temperature is controlled at 820-880°C.

7. The forging method of the new non-standard alloy material according to claim 1 is characterized in that: In step S2, the hot forging is performed using static pressure equipment.

8. The forging method of the new non-standard alloy material according to claim 1 is characterized in that: In step S3, the heat treatment adopts solution heat treatment, the temperature of the solution heat treatment is 900-980° C., the holding time is 2-8 hours, and the cooling of the solution heat treatment adopts air cooling and rapid cooling.

9. The forging method of the new non-standard alloy material according to claim 8, characterized in that: In step S3, the specific steps of solution heat treatment are as follows: S3-1. Solution treatment is performed on the workpiece in a vacuum heat treatment furnace at a temperature of 920-960°C. After a holding time of 3-5 hours, an inert gas is introduced to cool the workpiece to room temperature. S3-2. Perform aging treatment on the workpiece after solution treatment in a vacuum heat treatment furnace. The aging treatment temperature is 500-560°C. After the insulation time is 2-4 hours, inert gas is introduced to cool to room temperature.

10. The forging method of the new non-standard alloy material according to claim 9, characterized in that: In step S3-1, the fan flow rate of the inert gas cooling is 9000-12000m 3 / h, the pressure in the furnace does not exceed 8 bar; in step S3-2, the fan flow rate of the inert gas cooling is 3000~6000m 3 / h, the pressure in the furnace does not exceed 10bar.

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