Ageing process and heat treatment method for gh4099 alloy

Abstract

The application relates to the technical field of nickel-based high-temperature alloy heat treatment, in particular to an aging treatment method of GH4099 alloy and a heat treatment method. The aging treatment method of the GH4099 alloy comprises the following steps: after the GH4099 alloy is heated to T1 DEG C and is kept, the GH4099 alloy is heated to T2 and is kept, the GH4099 alloy is heated to T3 and is kept, the GH4099 alloy is heated to T4 and is kept, the GH4099 alloy is heated to T5 and is kept, then argon is filled to cool; T1 is 300-350 DEG C, T5 is 700-900 DEG C, T2=T1+50 DEG C-T1+100 DEG C, T3=T2+50 DEG C-T2+100 DEG C, T4=T3+50 DEG C-T3+100 DEG C, and T4 is less than T5. According to the aging treatment method, the aging heating stage is accurately controlled, multiple keeping steps are set, the effect of aging strengthening is realized while the temperature is slowly increased, and the local cracking problem of the alloy structure is successfully inhibited.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nickel-based superalloy heat treatment, in particular to an aging treatment method of GH4099 alloy and a heat treatment method. BACKGROUND

[0002] GH4099 is an aging strengthening type superalloy, which is based on Ni and Cr, strengthened by Al, Ti, W, Mo and Co, and has B and Mg as grain boundary strengthening elements. It is a high thermal strength material. Because it has good high-temperature creep resistance, it is mainly used in load-bearing parts of the combustion chamber of an aero-engine, and can be used at a long-term temperature of 900 DEG C and a maximum short-term temperature of 1000 DEG C.

[0003] Traditional forming methods cannot be used to form some parts with complex structures. Laser selective melting technology can be used to integrally form complex parts. The GH4099 superalloy formed by laser selective melting is in a deposited state. The GH4099 superalloy in the deposited state has defects such as pores and micro-cracks. The existing aging treatment method will cause local cracking of the GH4099 alloy, which affects the subsequent application of the GH4099 alloy component.

[0004] Therefore, the present application is provided. SUMMARY

[0005] An object of the present application is to provide an aging treatment method of GH4099 alloy to solve the technical problems of aging cracking in the prior art.

[0006] Another object of the present application is to provide a heat treatment method of GH4099 alloy.

[0007] In order to achieve the above object of the present application, the present application provides an aging treatment method of GH4099 alloy, which comprises the following steps:

[0008] The GH4099 alloy is heated to T1 DEG C and then treated by holding, then heated to T2 DEG C and treated by holding, then heated to T3 DEG C and treated by holding, then heated to T4 DEG C and treated by holding, then heated to T5 DEG C and treated by holding, and then cooled to 30-80 DEG C or below by argon filling.

[0009] In the present application, T1 is 300-350 DEG C, T5 is 700-900 DEG C, T2 = T1 + 50 DEG C-T1 + 100 DEG C, T3 = T2 + 50 DEG C-T2 + 100 DEG C, T4 = T3 + 50 DEG C-T3 + 100 DEG C, and T4 < T5.

[0010] In the specific embodiment of the present application, T2 is 350-400 DEG C.

[0011] In the embodiment of the present application, T3 is 400-450℃.

[0012] In the embodiment of the present application, T4 is 450-500℃.

[0013] In the embodiment of the present application, the holding time in the holding treatment after heating to T1℃ is 60-120min.

[0014] In the embodiment of the present application, the holding time in the holding treatment after heating to T2 is 60-120min.

[0015] In the embodiment of the present application, the holding time in the holding treatment after heating to T3 is 30-60min.

[0016] In the embodiment of the present application, the holding time in the holding treatment after heating to T4 is 30-60min.

[0017] In the embodiment of the present application, the holding time in the holding treatment after heating to T5 is 480-600min.

[0018] In the embodiment of the present application, the heating rate in heating to T1℃ is 5-10℃ / min; the heating rate in heating to T2℃ is 5-10℃ / min; the heating rate in heating to T3℃ is 5-10℃ / min; the heating rate in heating to T4℃ is 5-10℃ / min.

[0019] In the embodiment of the present application, the heating rate in heating to T5℃ is >10℃ / min.

[0020] In the embodiment of the present application, the heating rate in heating to T5℃ is 11-20℃ / min.

[0021] In the embodiment of the present application, the thickness of the GH4099 alloy is 0.5-1mm, and the length is ≥500mm.

[0022] The present application also provides a heat treatment method of GH4099 alloy, which comprises a solution treatment and any one of the above-mentioned aging treatment methods.

[0023] In the embodiment of the present application, the solution treatment comprises: heating to 500-800℃ and holding for 60-120min, then heating to 900-1300℃ and holding for 60-120min, and finally cooling to 30-80℃ under argon.

[0024] In the specific embodiment of the present application, in the solid solution treatment, the rate of the temperature rise is 5-10℃ / min.

[0025] Compared with the prior art, the present application has the following beneficial effects:

[0026] (1) The aging treatment method of the GH4099 alloy of the present application, by precisely controlling the aging temperature rise stage, sets multiple holding steps, realizes the effect of aging strengthening while slowly rising the temperature, and successfully suppresses the local cracking problem of the alloy structure;

[0027] (2) The heat treatment method of the present application, by adopting solid solution treatment and certain aging treatment method, can suppress the local cracking problem of the alloy on the basis of ensuring the mechanical properties of the GH4099 alloy. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the specific embodiments of the present application or the prior art, the drawings needed to be used in the specific embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0029] Figure 1 The surface morphology diagram of the GH4099 alloy part provided for Example 1 of the present application after heat treatment;

[0030] Figure 2 The surface morphology diagram of the GH4099 alloy part provided for Comparative Example 1 of the present application after heat treatment. DETAILED DESCRIPTION

[0031] The technical solutions of the present application will be described clearly and completely in the following with reference to the drawings and specific embodiments, but those skilled in the art will understand that the following described embodiments are part of the embodiments of the present application, not all the embodiments, and should not be regarded as limiting the scope of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. The specific conditions not mentioned in the embodiments are carried out according to the conventional conditions or the conditions recommended by the manufacturer. The reagents or instruments not mentioned by the manufacturer are all conventional products that can be purchased on the market.

[0032] The application discloses an aging treatment method of GH4099 alloy, and belongs to the technical field of alloy processing.

[0033] The application discloses an aging treatment method of GH4099 alloy, and belongs to the technical field of alloy processing.

[0034] The GH4099 alloy is heated to T1 ℃ and then is kept for treatment, is heated to T2 and then is kept for treatment, is heated to T3 and then is kept for treatment, is heated to T4 and then is kept for treatment, is heated to T5 and then is kept for treatment, and is cooled to 30-80 ℃ below T5 by argon filling.

[0035] Wherein, T1 is 300-350 ℃, T5 is 700-900 ℃, T2=T1+50 ℃-T1+100 ℃, T3=T2+50 ℃-T2+100 ℃, T4=T3+50 ℃-T3+100 ℃, and T4

[0036] The application discloses an aging treatment method of GH4099 alloy, and belongs to the technical field of alloy processing.

[0037] As in different embodiments, T1 can be 300 ℃, 320 ℃, 320 ℃, 340 ℃, 350 ℃ or a range formed by any two of them; T5 can be 700 ℃, 720 ℃, 750 ℃, 780 ℃, 800 ℃, 820 ℃, 850 ℃, 880 ℃, 900 ℃ or a range formed by any two of them; T2 can be T1+50 ℃, T1+60 ℃, T1+80 ℃, T1+100 ℃ or a range formed by any two of them; T3 can be T2+50 ℃, T2+60 ℃, T2+80 ℃, T2+100 ℃ or a range formed by any two of them; and T4 can be T3+50 ℃, T3+60 ℃, T3+80 ℃, T3+100 ℃ or a range formed by any two of them.

[0038] In actual operation, the cooling is performed by the way of argon filling into the system, so that the maximum cooling rate of the equipment can be adopted.

[0039] In actual operation, the GH4099 alloy is loaded into a furnace from room temperature, and then the subsequent operation of heating to T1 ℃ is performed. After the GH4099 alloy is loaded into the furnace, when the vacuum degree in the furnace is ≤≤9×10 -3 Pa, the operation of heating is performed.

[0040] In the specific embodiment of the application, T2 is 350-400 ℃.

[0041] In the specific embodiments of the present application, T3 is 400-450℃.

[0042] In the specific embodiments of the present application, T4 is 450-500℃.

[0043] In the specific embodiments of the present application, the holding time in the holding treatment after heating to T1℃ is 60-120min.

[0044] As in different embodiments, the holding time in the holding treatment after heating to T1℃ can be 60min, 70min, 80min, 90min, 100min, 110min, 120min, or a range consisting of any two of them.

[0045] In the specific embodiments of the present application, the holding time in the holding treatment after heating to T2 is 60-120min.

[0046] As in different embodiments, the holding time in the holding treatment after heating to T2℃ can be 60min, 70min, 80min, 90min, 100min, 110min, 120min, or a range consisting of any two of them.

[0047] In the specific embodiments of the present application, the holding time in the holding treatment after heating to T3 is 30-60min.

[0048] As in different embodiments, the holding time in the holding treatment after heating to T3℃ can be 30min, 40min, 50min, 60min, or a range consisting of any two of them.

[0049] In the specific embodiments of the present application, the holding time in the holding treatment after heating to T4 is 30-60min.

[0050] As in different embodiments, the holding time in the holding treatment after heating to T4℃ can be 30min, 40min, 50min, 60min, or a range consisting of any two of them.

[0051] In the stages of the above-mentioned holding treatments, the holding time is controlled to be within the above-mentioned ranges respectively, which can take into account the fullness of the aging effect, while also taking into account the heat treatment efficiency.

[0052] In the specific embodiments of the present application, the holding time in the holding treatment after heating to T5 is 480-600min.

[0053] The holding time after the temperature rising to T5℃ can be 480 min, 500 min, 520 min, 540 min, 560 min, 580 min, 600 min or a range formed by any two of them.

[0054] In the embodiment of the application, the temperature rising rate is 5-10℃ / min when the temperature rises to T1℃, 5-10℃ / min when the temperature rises to T2℃, 5-10℃ / min when the temperature rises to T3℃ and 5-10℃ / min when the temperature rises to T4℃.

[0055] In the embodiment of the application, the temperature rising rate is >10℃ / min when the temperature rises to T5℃, such as 11-20℃ / min.

[0056] In the embodiment of the application, the temperature rising rate can be 11℃ / min, 12℃ / min, 15℃ / min, 18℃ / min, 20℃ / min or a range formed by any two of them when the temperature rises to T5℃.

[0057] In the first several temperature stages of the aging treatment, the temperature rising rate is independently controlled in the range of 5-10℃ / min, slowly rising, and the temperature rising rate is increased in the last stage; by controlling the temperature rising process, the local cracking of GH4099 alloy parts can be further inhibited and the mechanical properties can be ensured.

[0058] In the embodiment of the application, the temperature rising and holding are performed under the condition that the vacuum degree is ≤9×10 -3 Pa.

[0059] In the embodiment of the application, the thickness of the GH4099 alloy is 0.5-1mm and the length is ≥500mm.

[0060] In the embodiment of the application, the thickness of the GH4099 alloy can be 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm or a range formed by any two of them, and the length can be 500mm, 520mm, 550mm, 580mm, 600mm, 650mm, 700mm, 750mm, 800mm or a range formed by any two of them.

[0061] For the GH4099 alloy with the above-mentioned size, the local cracking problem is more likely to occur under the existing aging system. After the aging treatment method of the application, the cracking problem can be effectively inhibited and the mechanical properties of the alloy can be ensured.

[0062] Another aspect of the present application provides a heat treatment method of GH4099 alloy, comprising solution treatment and any one of the above-mentioned aging treatment methods.

[0063] In the detailed embodiment of the present application, the solution treatment comprises: heating to 500-800℃ and holding for 60-120min, then heating to 900-1300℃ and holding for 60-120min, and then cooling to below 30-80℃ under argon.

[0064] As in different embodiments, in the solution treatment, the temperature can be first raised from room temperature to 500℃, 550℃, 600℃, 650℃, 700℃, 750℃, 800℃, or a range consisting of any two of them, and then held for 60min, 80min, 100min, 120min, or a range consisting of any two of them; then the temperature is raised to 900℃, 950℃, 1000℃, 1050℃, 1100℃, 1150℃, 1200℃, 1250℃, 1300℃, or a range consisting of any two of them, and then held for 60min, 80min, 100min, 120min, and then cooled by filling argon into the system. In actual operation, cooling is carried out by filling argon into the system, allowing the maximum cooling rate of the equipment to be used.

[0065] In the detailed embodiment of the present application, in the solution treatment, the heating rate is 5-10℃ / min.

[0066] In the detailed embodiment of the present application, in the solution treatment, the heating and holding are carried out under the condition that the vacuum degree is ≤9×10 -3 Pa.

[0067] Example 1

[0068] This embodiment provides a heat treatment method of GH4099 alloy, comprising solution treatment and aging treatment, specifically comprising the following steps:

[0069] Solution treatment: the GH4099 alloy selected area laser melting formed member with a thickness of 0.5-1.0mm and a length of ≥500mm is loaded into the furnace at room temperature, vacuumized to a vacuum degree in the furnace ≤9×10 -3 Pa, heating is started, and the temperature is raised to 650℃ at a rate of 7.5℃ / min; then held at 650℃ for 90min; then raised to 1100℃ at a rate of 5℃ / min and held for 90min; then cooled to below 80℃ by filling argon into the furnace and unloaded, and the maximum cooling rate of the equipment is used, which is about 250-300℃ / min in the high temperature stage, and will not be described in detail hereinafter.

[0070] Aging treatment:

[0071] (1) The GH4099 alloy component after solution treatment is loaded into the furnace at room temperature, vacuumized to a vacuum degree in the furnace ≤ 9 x 10 - 3 Pa, and then heating is started, and the temperature is raised to 350℃ at a rate of 7.5℃ / min, and held for 90 min; then raised to 400℃ at a rate of 7.5℃ / min, and held for 90 min; then raised to 450℃ at a rate of 5℃ / min, and held for 45 min; then raised to 500℃ at a rate of 5℃ / min, and held for 45 min; then raised to 800℃ at a rate of 15℃ / min, and held for 540 min;

[0072] (2) Then argon is filled into the furnace to cool to below 80℃, and the component is taken out of the furnace at the maximum cooling rate of the equipment.

[0073] Example 2

[0074] This example refers to the heat treatment method of Example 1, with the only difference being that the conditions of the aging treatment are different.

[0075] The aging treatment of Example 2 includes the following steps:

[0076] (1) The GH4099 alloy component after solution treatment is loaded into the furnace at room temperature, vacuumized to a vacuum degree in the furnace ≤ 9 x 10 - 3 Pa, and then heating is started, and the temperature is raised to 300℃ at a rate of 7.5℃ / min, and held for 90 min; then raised to 350℃ at a rate of 7.5℃ / min, and held for 90 min; then raised to 400℃ at a rate of 5℃ / min, and held for 45 min; then raised to 450℃ at a rate of 5℃ / min, and held for 45 min; then raised to 700℃ at a rate of 15℃ / min, and held for 540 min;

[0077] (2) Then argon is filled into the furnace to cool to below 80℃, and the component is taken out of the furnace at the maximum cooling rate of the equipment.

[0078] Example 3

[0079] This example refers to the heat treatment method of Example 1, with the only difference being that the conditions of the aging treatment are different.

[0080] The aging treatment of Example 3 includes the following steps:

[0081] (1) The GH4099 alloy component after solution treatment is loaded into the furnace at room temperature, vacuumized to a vacuum degree in the furnace ≤ 9 x 10 - 3Pa, then heating is started, and the temperature is raised to 350℃ at a rate of 7.5℃ / min, and held for 90min; then raised to 450℃ at a rate of 7.5℃ / min, and held for 90min; then raised to 500℃ at a rate of 5℃ / min, and held for 45min; then raised to 550℃ at a rate of 5℃ / min, and held for 45min; then raised to 900℃ at a rate of 15℃ / min, and held for 540min;

[0082] (2) Then argon is filled into the furnace to cool to below 80℃, and the furnace is discharged, using the maximum cooling rate of the equipment.

[0083] Example 4

[0084] This example refers to the heat treatment method of Example 1, with the difference being only in the conditions of the aging treatment.

[0085] The aging treatment of Example 4 includes the following steps:

[0086] (1) The GH4099 alloy component after solution treatment is loaded into the furnace at room temperature, and vacuum is extracted to a vacuum degree in the furnace ≤ 9x10 - 3 Pa, then heating is started, and the temperature is raised to 350℃ at a rate of 5℃ / min, and held for 60min; then raised to 400℃ at a rate of 5℃ / min, and held for 60min; then raised to 450℃ at a rate of 5℃ / min, and held for 30min; then raised to 500℃ at a rate of 5℃ / min, and held for 30min; then raised to 800℃ at a rate of 15℃ / min, and held for 480min;

[0087] (2) Then argon is filled into the furnace to cool to below 80℃, and the furnace is discharged, using the maximum cooling rate of the equipment.

[0088] Example 5

[0089] This example refers to the heat treatment method of Example 1, with the difference being only in the conditions of the aging treatment.

[0090] The aging treatment of Example 5 includes the following steps:

[0091] (1) The GH4099 alloy component after solution treatment is loaded into the furnace at room temperature, and vacuum is extracted to a vacuum degree in the furnace ≤ 9x10 - 3 Pa, then heating is started, and the temperature is raised to 350℃ at a rate of 10℃ / min, and held for 120min; then raised to 400℃ at a rate of 10℃ / min, and held for 120min; then raised to 450℃ at a rate of 10℃ / min, and held for 60min; then raised to 500℃ at a rate of 10℃ / min, and held for 60min; then raised to 800℃ at a rate of 20℃ / min, and held for 600min;

[0092] (2) Then, the furnace is filled with argon gas and cooled to below 80°C before being discharged, and the maximum cooling rate of the equipment is used.

[0093] Example 6

[0094] This example refers to the heat treatment method of Example 1, with the only difference being that the conditions of the aging treatment are different.

[0095] The aging treatment of Example 6 includes the following steps:

[0096] (1) The GH4099 alloy component after solution treatment is loaded into the furnace at room temperature, vacuumized to a vacuum degree in the furnace ≤ 9 × 10 - 3 Pa, and then heating is started, with the temperature being raised to 350°C at a rate of 7.5°C / min and kept for 90 min; then raised to 400°C at a rate of 7.5°C / min and kept for 90 min; then raised to 450°C at a rate of 5°C / min and kept for 45 min; then raised to 500°C at a rate of 5°C / min and kept for 45 min; and then raised to 800°C at a rate of 10°C / min and kept for 540 min;

[0097] (2) Then, the furnace is filled with argon gas and cooled to below 80°C before being discharged, and the maximum cooling rate of the equipment is used.

[0098] Comparative Example 1

[0099] Comparative Example 1 refers to the heat treatment method of Example 1, with the only difference being that the conditions of the aging treatment are different.

[0100] The aging treatment of Comparative Example 1 includes the following steps:

[0101] (1) The GH4099 alloy component after solution treatment is loaded into the furnace at room temperature, vacuumized to a vacuum degree in the furnace ≤ 9 × 10 - 3 Pa, and then heating is started, with the temperature being raised to 800°C at a rate of 7.5°C / min and kept for 540 min at 800°C;

[0102] (2) The furnace is filled with argon gas and cooled to below 80°C before being discharged, and the maximum cooling rate of the equipment is used.

[0103] Comparative Example 2

[0104] Comparative Example 2 refers to the heat treatment method of Example 1, with the only difference being that the conditions of the aging treatment are different.

[0105] The aging treatment of Comparative Example 2 includes the following steps:

[0106] (1) The GH4099 alloy component after solution treatment is loaded into the furnace at room temperature, vacuumized to a vacuum degree in the furnace ≤ 9 × 10 - 3Pa, then heating was started, and the temperature was increased to 350°C at a rate of 7.5°C / min, and held for 90 min; then increased to 450°C at a rate of 7.5°C / min, and held for 45 min; then increased to 800°C at a rate of 15°C / min, and held for 540 min;

[0107] (2) Then argon was filled into the furnace to cool to below 80°C, and the furnace was discharged, using the maximum cooling rate of the equipment.

[0108] Comparative Example 3

[0109] Comparative Example 3 refers to the heat treatment method of Example 1, except that the aging treatment conditions are different.

[0110] The aging treatment of Comparative Example 3 includes the following steps:

[0111] (1) The GH4099 alloy component after solution treatment was loaded into the furnace at room temperature, and vacuum was extracted to a vacuum degree in the furnace of ≤ 9 × 10 - 3 Pa, then heating was started, and the temperature was increased to 400°C at a rate of 7.5°C / min, and held for 90 min; then increased to 500°C at a rate of 7.5°C / min, and held for 45 min; then increased to 800°C at a rate of 15°C / min, and held for 540 min;

[0112] (2) Then argon was filled into the furnace to cool to below 80°C, and the furnace was discharged, using the maximum cooling rate of the equipment.

[0113] Comparative Example 4

[0114] Comparative Example 4 refers to the heat treatment method of Example 1, except that the aging treatment conditions are different.

[0115] The aging treatment of Comparative Example 4 includes the following steps:

[0116] (1) The GH4099 alloy component after solution treatment was loaded into the furnace at room temperature, and vacuum was extracted to a vacuum degree in the furnace of ≤ 9 × 10 - 3 Pa, then heating was started, and the temperature was increased to 250°C at a rate of 7.5°C / min, and held for 90 min; then increased to 300°C at a rate of 7.5°C / min, and held for 90 min; then increased to 350°C at a rate of 5°C / min, and held for 45 min; then increased to 400°C at a rate of 5°C / min, and held for 45 min; then increased to 800°C at a rate of 15°C / min, and held for 540 min;

[0117] (2) Then argon was filled into the furnace to cool to below 80°C, and the furnace was discharged, using the maximum cooling rate of the equipment.

[0118] Comparative Example 5

[0119] Comparative Example 5 refers to the heat treatment method of Example 1, except that the aging treatment conditions are different.

[0120] The aging treatment of Comparative Example 5 includes the following steps:

[0121] (1) The GH4099 alloy member after solution treatment is loaded into the furnace at room temperature, vacuumized to a vacuum degree in the furnace ≤ 9 × 10 - 3 Pa, and then heating is started, and the temperature is raised to 450℃ at a rate of 7.5℃ / min, and kept for 90min; then the temperature is raised to 500℃ at a rate of 7.5℃ / min, and kept for 90min; then the temperature is raised to 550℃ at a rate of 5℃ / min, and kept for 45min; then the temperature is raised to 600℃ at a rate of 5℃ / min, and kept for 45min; then the temperature is raised to 800℃ at a rate of 15℃ / min, and kept for 540min;

[0122] (2) Then the furnace is filled with argon gas to cool to below 80℃, and the equipment maximum cooling rate is used.

[0123] Experimental Example 1

[0124] In order to compare and illustrate the local cracking of the alloy member after heat treatment of different examples and comparative examples, the surface morphology of the GH4099 alloy member after heat treatment of different examples and comparative examples is detected. The surface morphology of Example 1 and Comparative Example 2 is shown in FIGS. 1 and 2, respectively. As can be seen from the figures, the GH4099 alloy member after heat treatment of Example 1 does not have local cracking problem; and the GH4099 alloy member after heat treatment of Comparative Example 1 has local cracking problem at the same position as Example 1. Figures 1-2

[0125] The local cracking of the alloy member after heat treatment of each example and comparative example is determined, and the alloy member after aging treatment is detected by X-ray diffraction, and whether there is a crack is determined by the negative. The alloy member obtained by the treatment method of Example 1 to Example 6 does not have a crack, while Comparative Examples 1 to 5 all have cracks to different degrees, which are unqualified.

[0126] The mechanical properties of the GH4099 alloy member after heat treatment of different examples and comparative examples of the application are characterized, and the specific test results are shown in Table 2, and the properties meet the index requirements.

[0127] Table 2 Mechanical properties (room temperature tensile properties) of the alloy member after heat treatment of different examples and comparative examples

[0128] No. Tensile strength / MPa Yield strength / MPa Elongation / % Example 1 491 487 16 Example 2 480 477 14 Example 3 478 465 20 Example 4 489 486 14 Example 5 486 480 11 Example 6 487 485 11 Comparative Example 1 456 412 12 Comparative Example 2 456 439 13 Comparative Example 3 458 448 14 Comparative Example 4 458 448 15 Comparative Example 5 464 449 18 Indicator ≥400 ≥350 ≥10 Determination Pass Pass Pass Pass

[0129] ​From the test results, the aging treatment method of the GH4099 alloy can precisely control the aging temperature rising stage, set multiple holding steps, realize the aging strengthening effect while slowly rising the temperature, and successfully inhibit the local cracking problem of the alloy structure.

[0130] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, but not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for aging treatment of GH4099 alloy, characterized in that, The method comprises the following steps: The GH4099 alloy is heated to T1 ℃, then treated for a while, then heated to T2 ℃, treated for a while, then heated to T3 ℃, treated for a while, then heated to T4 ℃, treated for a while, then heated to T5 ℃, treated for a while, and then cooled to 30-80 ℃ under argon; Wherein, T1 is 300-350 ℃, T5 is 700-900 ℃, T2=T1+50 ℃-T1+100 ℃, T3=T2+50 ℃-T2+100 ℃, T4=T3+50 ℃-T3+100 ℃, and T4<T5; In the heating to T1 ℃, the heating rate is 5-10 ℃ / min; In the heating to T2 ℃, the heating rate is 5-10 ℃ / min; In the heating to T3 ℃, the heating rate is 5-10 ℃ / min; In the heating to T4 ℃, the heating rate is 5-10 ℃ / min; In the heating to T5 ℃, the heating rate is >10 ℃ / min.

2. The method of claim 1, wherein At least one of the following features is possessed: (1) T2 is 350-400 ℃; (2) T3 is 400-450 ℃ (3) T4 is 450-500 ℃.

3. The method of claim 1, wherein the aging treatment is performed at a temperature of 150 to 250°C for 1 to 100 hours. At least one of the following features is possessed: (1) In the heating to T1 ℃ and treated for a while, the holding time is 60-120 min; (2) In the heating to T2 ℃ and treated for a while, the holding time is 60-120 min; (3) In the heating to T3 ℃ and treated for a while, the holding time is 30-60 min; (4) In the heating to T4 ℃ and treated for a while, the holding time is 30-60 min; (5) In the heating to T5 ℃ and treated for a while, the holding time is 480-600 min.

4. The method of claim 1, wherein In the heating to T5 ℃, the heating rate is 11-20 ℃ / min.

5. The method of claim 1, wherein the aging treatment is performed at a temperature of 150 to 250°C for 1 to 100 hours. The thickness of the GH4099 alloy is 0.5-1 mm, and the length is ≥500 mm.

6. A heat treatment method of GH4099 alloy, characterized in that, The method comprises solid solution treatment and aging treatment according to any one of claims 1-5.

7. The heat treatment method according to claim 6, characterized by, The solid solution treatment comprises: heating to 500-800 ℃, treated for 60-120 min, then heating to 900-1300 ℃, treated for 60-120 min, and then cooled to 30-80 ℃ under argon.

8. The heat treatment method according to claim 7, characterized by, In the solid solution treatment, the heating rate is 5-10 ℃ / min.

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