Machining method of RENE41 alloy forge piece

Abstract

The invention relates to the field of processing of RENE41 alloy forgings, in particular to a processing method of RENE41 alloy forgings, which comprises the following steps: step S11: on the basis of obtaining a ring blank, carrying out heat treatment on the ring blank to obtain a first forgings, the heat preservation time of the ring blank is t1, t1 is equal to (H1 / 62.5) * t2min, the heat preservation temperature of the ring blank is T1, T1 is equal to (H1 / 62.5) * f DEG C, H1 is the thickness of the ring blank, and H1 is more than or equal to 61.5 mm and less than or equal to 63.5 mm; t2 is a time constant, 25 < = t2 < = 35; f is a temperature constant and is greater than or equal to 1070 and less than or equal to 1080; and S12, based on the first forge piece, cold bulging is conducted on the first forge piece, and a second forge piece is obtained. In this way, the problem existing in thermal bulging of the RENE41 alloy in the prior art is solved.

Description

Technical Field

[0001] The invention relates to the field of processing of RENE41 alloy forgings, and in particular to a processing method of RENE41 alloy forgings. Background Art

[0002] RENE41 alloy (a precipitation-hardened nickel-based high-temperature alloy) has high room temperature and high temperature strength as well as good corrosion and oxidation resistance. It is widely used in the hot end components of aircraft engines. During the machining process, the thermal expansion of the material caused by high temperature and the contraction during the cooling process can easily cause stress accumulation, resulting in material deformation, thus affecting the quality and reliability of the product. Therefore, RENE41 alloy still faces the problem of machining deformation during the machining process.

[0003] In the existing RENE41 alloy processing process, hot expansion is mostly used. The RENE41 alloy is heated and then expanded. Although this method can speed up the expansion speed of the RENE41 alloy, the heating and cooling are uneven during the forging process, and a temperature gradient is generated inside the forging. The surface of the forging cools quickly, while the inside cools slowly, and a large stress is generated inside the forging. Moreover, due to the temperature difference inside the forging and the different cooling rates, the grain size inside the forging is uneven, and the stress distribution inside the forging is also uneven. If there is a large stress, it is very likely to cause large warping during further processing of the product. Summary of the invention

[0004] In order to solve the above problems existing in the prior art for hot expansion of RENE41 alloy, the present invention provides a processing method of RENE41 alloy forgings, comprising:

[0005] Step S11: Based on the obtained ring blank, heat-treating the ring blank to obtain the first forging, wherein the holding time of the ring blank is t1, t1=(H1 / 62.5)×t2min, and the holding temperature of the ring blank is T1, T1=(H1 / 62.5)×f℃, wherein H1 is the thickness of the ring blank, 61.5mm≤H1≤63.5mm; t2 is the time constant, 25≤t2≤35; f is the temperature constant, 1070≤f≤1080;

[0006] Step S12: Based on the first forging, cold expansion is performed on the first forging to obtain a second forging.

[0007] In some embodiments, in step S12, the bulging speed of the first forging is V, V=(H1 / 62.5)×1 mm / s.

[0008] In some embodiments, in step S12, the deformation rate of the first forging is M, M = (H1-H2) / H1; wherein 0.7%≤M≤2.8%, wherein H2 is the thickness of the second forging.

[0009] In some embodiments, M is equal to 0.7%.

[0010] In some embodiments, in step S12, when the first forging is expanded to the second forging, the second forging is pressurized for 25s to 35s.

[0011] In some embodiments, in step S12, when the first forging is expanded to the second forging, the second forging is pressurized for 30 seconds.

[0012] In some embodiments, in step S12, the temperature at which the first forging is cold expanded is 20°C to 26°C.

[0013] In some embodiments, the method for processing the RENE41 alloy forging includes step S13: based on the second forging, cutting the second forging along the radial direction of the second forging to obtain a third forging.

[0014] In some embodiments, in the method for processing the RENE41 alloy forging, the height of the ring blank, the first forging, and the second forging is S, wherein 130 mm ≤ S ≤ 140 mm.

[0015] In some embodiments, in step S11, the hardness of the first forging is W, 310HB≤W≤330HB.

[0016] In order to solve the problems existing in the prior art for hot expansion of RENE41 alloy, the present invention has the following advantages:

[0017] The first forging is obtained by heat treating the ring blank of RENE41 alloy, and the grains in the ring blank are shaped, so that the internal stress of RENE41 alloy is eliminated as much as possible and the mechanical properties of RENE41 alloy are improved. Then, the first forging is cold expanded to release the residual stress in the first forging as much as possible, and the first forging can also be cold expanded to form the required second forging, which solves the problem that hot expansion easily causes the grains inside RENE41 alloy to have irregular forming and large stress, resulting in a high possibility of large warping in the further processing of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a flow chart of a processing method of RENE41 alloy forgings;

[0019] Figure 2 is a cross-sectional view of the first forging;

[0020] Figure 3 is a cross-sectional view of the second forging;

[0021] Figure 4 is a cross-sectional view of the second forging after cutting;

[0022] In the figure: 10, the first forging; 20, the second forging; 30, the third forging. DETAILED DESCRIPTION

[0023] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0024] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0025] This embodiment discloses a RENE41 alloy forging machining method, such as Figure 1 As shown, the following steps are included:

[0026] Step S11: Based on the obtained ring blank, heat treatment is performed on the ring blank to obtain the first forging 10, wherein the holding time of the ring blank is t1, t1=(H1 / 62.5)×t2min, and the holding temperature of the ring blank is T1, T1=(H1 / 62.5)×f℃, wherein H1 is the thickness of the ring blank, 61.5mm≤H1≤63.5mm; t2 is the time constant, 25≤t2≤35; f is the temperature constant, 1070≤f≤1080;

[0027] Step S12: Based on the first forging 10 , cold expansion is performed on the first forging 10 to obtain a second forging 20 .

[0028] In this embodiment, the first forging 10 is obtained by heat treating the ring blank of RENE41 alloy, the grains in the ring blank are shaped, the internal stress of RENE41 alloy is eliminated as much as possible, and the mechanical properties of RENE41 alloy are improved. Then, the first forging 10 is cold expanded, so that the residual stress in the first forging 10 is released as much as possible, and the first forging 10 can also be cold expanded to form the required second forging 20, which solves the problem that hot expansion easily causes the grains inside RENE41 alloy to have large stress due to irregular formation, resulting in the product being very likely to have large warping during further processing. In this embodiment, t2 is preferably 30; f is preferably 1079.

[0029] In some embodiments, in step S12, the bulging speed of the first forging 10 is V, V=(H1 / 62.5)×1 mm / s.

[0030] In this embodiment, by setting the bulging speed of the first forging 10 to V, V = (H1 / 62.5) × 1mm / s, it is possible to achieve bulging at different speeds for forgings of different thicknesses. When the thickness of the first forging 10 is large, V is slightly increased, so that in addition to ensuring the bulging amount of the first forging 10, the stress in the first forging 10 can be released faster, and the bulging speed of the first forging 10 can be further increased to improve the bulging efficiency. When the thickness of the first forging 10 is small, the bulging speed can be appropriately reduced to avoid the first forging 10 bulging too fast due to its small thickness, resulting in the release of the original stress inside the first forging 10 and the generation of new stress, which affects the product quality.

[0031] In some embodiments, Figure 2 , Figure 3As shown, in step S12, the deformation rate of the first forging 10 is M, M=(H1-H2) / H1; wherein 0.7%≤M≤2.8%, wherein H2 is the thickness of the second forging 20.

[0032] In this embodiment, the deformation rate of the first forging 10 is set to M, 0.7%≤M≤2.8%. By performing a certain amount of bulging on the first forging 10, the stress in the first forging 10 is released, and a second forging 20 with smaller internal stress is obtained, which facilitates the subsequent processing of the second forging 20.

[0033] In some embodiments, M is equal to 0.7%.

[0034] In this embodiment, preferably, when the deformation amount is 0.7%, the stress in the first forging 10 is released to obtain the second forging 20 with smaller internal stress, which is convenient for subsequent processing of the second forging 20 .

[0035] In some embodiments, in step S12, when the first forging 10 is expanded to the second forging 20, the second forging 20 is pressurized for 25s to 35s.

[0036] In this embodiment, when the first forging 10 is expanded to form the second forging 20, the second forging 20 is maintained at pressure for 25s to 35s. In this embodiment, the holding time of the second forging 20 is preferably 30s, which can prevent the second forging 20 from undergoing plastic deformation when the expansion is completed before the second forging 20 is fully formed.

[0037] In some embodiments, in step S12, when the first forging is expanded to the second forging, the second forging is pressurized for 30 seconds.

[0038] In this embodiment, as a preferred method, by maintaining the pressure of the second forging 20 for 30 seconds, it is possible to effectively prevent the second forging 20 from being plastically deformed after being formed, thereby ensuring the quality of the second forging 20.

[0039] In some embodiments, in step S12, the temperature at which the first forging 10 is subjected to cold expansion is 20°C to 26°C.

[0040] In this embodiment, the cold bulging temperature of the first forging 10 is 20°C to 26°C, which is room temperature. By cold bulging the first forging 10 at room temperature, the ring blank can be cooled to room temperature after heat treatment, and the grains inside the ring blank are better formed, which can better eliminate the stress inside the ring blank, so as to ensure that when the first forging 10 is bulged, a second forging 20 with a better shape can be obtained.

[0041] In some embodiments, the method for processing the RENE41 alloy forging includes step S13: based on the second forging 20 , cutting the second forging 20 along the radial direction of the second forging 20 to obtain a third forging 30 .

[0042] In this embodiment, the second forging 20 is further cut to obtain the third forging 30, which is a further processing of the second forging 20. Since the internal stress of the second forging 20 has been greatly eliminated after cold expansion, a more complete third forging 30 can be obtained by further processing the second forging 20. In addition, the second forging 20 can be evenly divided as needed during the process of cutting into the third forging 30. In this embodiment, the height and number of the third forgings 30 are calculated in advance to determine the height of the ring blank. Since the heights of the ring blank and the first forging 10 remain unchanged during the heat treatment and cold expansion process, the heights of the ring blank, the first forging 10, and the second forging 20 can be the product of the thickness of the third forging 30 and its number.

[0043] In some embodiments, in the method for processing the RENE41 alloy forging, the height of the ring blank, the first forging 10, and the second forging 20 is S, wherein 130 mm ≤ S ≤ 140 mm.

[0044] In this embodiment, the height of the ring blank, the first forging 10, and the second forging 20 is S, wherein 130 mm ≤ S ≤ 140 mm. As a preferred embodiment of this embodiment, the value of S is 134 mm.

[0045] In some embodiments, in step S11, the hardness of the first forging 10 is W, 310HB≤W≤330HB.

[0046] In this embodiment, after the ring blank is heat treated, the hardness of the first forging 10 obtained is 310HB~330HB. This hardness range can ensure the required hardness of the third forging 30 while also better bulging the first forging 10, thereby improving the quality of the third forging 30.

[0047] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present disclosure.

Claims

1. A method for processing a RENE41 alloy forging, characterized in that: The following steps are involved: Step S11: Based on the obtained ring blank, heat-treating the ring blank to obtain the first forging, wherein the holding time of the ring blank is t1, t1=(H1 / 62.5)×t2min, and the holding temperature of the ring blank is T1, T1=(H1 / 62.5)×f℃, wherein H1 is the thickness of the ring blank, 61.5mm≤H1≤63.5mm; t2 is the time constant, 25≤t2≤35; f is the temperature constant, 1070≤f≤1080; Step S12: Based on the first forging, cold expansion is performed on the first forging to obtain a second forging.

2. A method for processing a RENE41 alloy forging according to claim 1, characterized in that: In step S12, the bulging speed of the first forging is V, V = (H1 / 62.5) × 1 mm / s.

3. The method for processing a RENE41 alloy forging according to claim 1, characterized in that: In step S12, the deformation rate of the first forging is M, M = (H1-H2) / H1; wherein 0.7%≤M≤2.8%, wherein H2 is the thickness of the second forging.

4. A method for processing a RENE41 alloy forging according to claim 3, characterized in that: The M is equal to 0.7%.

5. The method for processing a RENE41 alloy forging according to claim 3, characterized in that: In step S12, when the first forging is expanded to the second forging, the second forging is pressurized for 25s to 35s.

6. A method for processing a RENE41 alloy forging according to claim 5, characterized in that: In step S12, when the first forging is expanded to the second forging, the second forging is pressurized for 30 seconds.

7. The method for processing a RENE41 alloy forging according to claim 1, characterized in that: In step S12, the temperature of the first forging undergoing cold expansion is 20°C to 26°C.

8. The method for processing a RENE41 alloy forging according to claim 1, characterized in that: The processing method of the RENE41 alloy forging comprises step S13: based on the second forging, cutting the second forging along the radial direction of the second forging to obtain a third forging.

9. The method for processing a RENE41 alloy forging according to claim 1, characterized in that: In the processing method of the RENE41 alloy forging, the height of the ring blank, the first forging, and the second forging is S, wherein 130 mm ≤ S ≤ 140 mm.

10. A method for processing a RENE41 alloy forging according to claim 1, characterized in that: In step S11, the hardness of the first forging is W, 310HB≤W≤330HB.

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