CN114214510A - Method for removing residual stress in high-temperature alloy part through vibration aging and application of method - Google Patents
Method for removing residual stress in high-temperature alloy part through vibration aging and application of method Download PDFInfo
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Abstract
The invention relates to the technical field of high-temperature alloy part processing, in particular to a method for removing residual stress in a high-temperature alloy part through vibration aging and application thereof. The method for removing the residual stress in the high-temperature alloy part by vibration aging comprises the following steps: adjusting the residual unbalance amount of the high-temperature alloy part to be 1-60 g.mm, and then rotating the high-temperature alloy part at a high speed; the high-temperature alloy part comprises any one of a disc part and an annular part. The high-temperature alloy part processing device abandons the traditional vibration exciter, processes the high-temperature alloy part into an eccentric system, and induces resonance to form vibration stress by rotating at a high speed to a certain rotating speed to be close to the natural frequency of the high-temperature alloy part, so that the residual stress in the high-temperature alloy part is superposed, plastic deformation occurs, and the residual stress in the high-temperature alloy part is removed by aging; and the vibration stress is distributed more uniformly, the induced plastic deformation is more uniform, the effect of removing the residual stress can be better achieved, and new residual stress field distribution cannot be generated.
Description
Technical Field
The invention relates to the technical field of high-temperature alloy part processing, in particular to a method for removing residual stress in a high-temperature alloy part through vibration aging and application thereof.
Background
The high-temperature alloy disk or ring part is mainly used for preparing rotors and casings of aeroengines and aerospace engines and is an important hot-end bearing part. For these high temperature alloy pieces, rapid cooling is required during the cooling stage after solution heat treatment to ensure the mechanical properties of the material after aging. Then, due to the rapid cooling, different regions inside the workpiece cannot be cooled synchronously, and the thermal stress causes uneven plastic deformation, thereby causing large residual stress to be formed after cooling.
The vibration aging is a method commonly used for eliminating internal residual stress of engineering materials, and is characterized in that when the vector sum of the internal residual stress of a workpiece and additional vibration stress exceeds the yield strength of the material through vibration, the material is subjected to micro plastic deformation locally, so that the internal stress in the material is relaxed and relieved. The equipment for realizing vibration aging mainly comprises a vibration exciter, wherein the vibration exciter is a motor system with an eccentric weight block, the vibration exciter is arranged on a workpiece, the workpiece is supported by elastic objects such as a rubber pad and the like, and the motor is started and the rotating speed of the motor is adjusted through a controller to enable the workpiece to be in a resonance state.
However, the following technical bottlenecks exist in the existing vibration aging method: (1) the high-temperature alloy material has high strength, and a higher value of vibration stress is needed to achieve the effect of eliminating residual stress; (2) the natural frequency of the high-rigidity workpiece is high, and stress can not be eliminated through the existing vibration aging technology. The high-temperature alloy disc part and the ring part have high rigidity, and the resonance frequency of the high-temperature alloy disc part and the ring part is 100-5000 Hz generally. The vibration exciter can meet the requirement of exciting force required by the high-temperature alloy part, and the working frequency generated by the vibration exciter is generally lower than 100 Hz. And therefore residual stress relief cannot be performed using conventional vibratory aging.
In the prior art, a method for eliminating internal stress by adopting a high-speed rotation mode is adopted, and centrifugal force is generated in a workpiece by high-speed rotation, residual stress in the workpiece is superposed, and plastic deformation and the like are generated. However, since the rotational centrifugal force is unevenly distributed in the workpiece, in the case of a disk, the rotational stress at the center of the disk is large and the rotational stress at the edge of the disk is low, the plastic deformation caused by the uneven distribution is often concentrated on the center of the disk, and a new residual stress field distribution is easily caused.
Therefore, how to develop a vibration aging mode for the internal residual stress of the high-temperature alloy piece is of great significance for the processing of the high-temperature alloy piece.
In view of the above, the present invention is particularly proposed.
Disclosure of Invention
The invention aims to provide a method for removing residual stress in a high-temperature alloy part by vibration aging, which aims to solve the technical problem that the vibration aging in the prior art cannot be applied to the high-temperature alloy part and the like.
The second purpose of the invention is to provide the application of the method for removing the residual stress in the high-temperature alloy part by vibration aging in the preparation of the high-temperature alloy part.
In order to achieve the above purpose of the present invention, the following technical solutions are adopted:
the method for removing the residual stress in the high-temperature alloy part by vibration aging comprises the following steps:
adjusting the residual unbalance amount of the high-temperature alloy part to be 1-60 g.mm, and then rotating the high-temperature alloy part at a high speed; the high-temperature alloy part comprises any one of a disc part and an annular part.
According to the method, a traditional vibration exciter is abandoned, the high-temperature alloy part is processed into an eccentric system, the high-temperature alloy part is rotated to a certain rotating speed at a high speed and is close to the natural frequency of the high-temperature alloy part, resonance is triggered to form vibration stress, and therefore the residual stress in the high-temperature alloy part is superposed, plastic deformation occurs, and the residual stress in the high-temperature alloy part is removed in time effectiveness. And through the adjustment of the residual unbalance, the amplitude of a system when resonance is caused can be ensured, and the operability and the stability are ensured.
The method of the invention has more uniform vibration stress distribution and more uniform induced plastic deformation, can achieve better residual stress removing effect and can not generate new residual stress field distribution.
In a specific embodiment of the invention, a dynamic balancing machine is used to adjust the residual unbalance of the superalloy component.
In a specific embodiment of the invention, the residual unbalance amount of the high-temperature alloy piece is adjusted to be 1-50 g.mm.
In a specific embodiment of the present invention, the high speed rotation is performed to generate resonance.
In another embodiment of the present invention, the method for calculating the rotation speed of the high-speed rotation includes: the adjusted high-temperature alloy part is rotated at a high speed, the vibration amplitude change is tested and analyzed, and the corresponding rotating speed is R when the vibration amplitude is maximum1Unit R/min, in R1And +/-5% is taken as the rotating speed of the high-temperature alloy piece.
In an embodiment of the present invention, the method for calculating the rotation speed of the high-speed rotation includes: and carrying out modal analysis by using finite element software to obtain the natural frequency of the high-temperature alloy part, namely the required target rotating speed.
In a specific embodiment of the invention, the high-speed rotation speed is 2000-50000 r/min.
In a specific embodiment of the present invention, the time of the high speed rotation is 1-30 min.
In a specific embodiment of the invention, in the process of high-speed rotation, the vibration amplitude of the high-temperature alloy part is monitored, and the vibration amplitude of the high-temperature alloy part is controlled to be 5-100 μm.
In a specific embodiment of the present invention, the temperature T of the superalloy material at the time of the high-speed rotation satisfies: t is not less than T at room temperature0Wherein T is0Is the aging temperature of the high-temperature alloy material.
In a specific embodiment of the invention, the high-temperature alloy piece is a high-temperature alloy piece subjected to solution heat treatment or a high-temperature alloy piece subjected to solution heat treatment and aging heat treatment.
In a particular embodiment of the invention, the superalloy comprises any of GH4169, GH4720Li, GH4738, GH4151, GH4251, GH40 4065A, FGH95, FGH96, FGH97 and FGH 98.
The invention also provides application of any one of the methods for removing the residual stress in the high-temperature alloy part through vibration aging in preparation of the high-temperature alloy part.
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the method, a traditional vibration exciter is abandoned, the high-temperature alloy part is processed into an eccentric system, the high-temperature alloy part is rotated to a certain rotating speed at a high speed and is close to the natural frequency of the high-temperature alloy part, resonance is caused to form vibration stress, so that the internal residual stress of the high-temperature alloy part is superposed, plastic deformation is generated, and the internal residual stress is removed in time effectiveness;
(2) according to the method, the vibration stress distribution is more uniform, the induced plastic deformation is more uniform, the effect of removing the residual stress can be better achieved, and new residual stress field distribution cannot be generated;
(3) the method of the invention is convenient to combine with temperature regulation and control in the load application process, can reduce the local yield strength of the material, and is easier to initiate plastic deformation, thereby regulating and controlling the residual stress.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic size diagram of a GH4169 alloy disk provided by an embodiment of the invention;
FIG. 2 is a graph of vibration amplitude versus rotational speed for an alloy disc provided in an embodiment of the present invention at high rotational speeds;
FIG. 3 shows the chordwise residual stress of the alloy disk after high-speed rotation provided in example 1 of the present invention;
FIG. 4 shows the chordwise residual stress of the alloy disk after high-speed rotation provided in example 2 of the present invention;
FIG. 5 shows the chordwise residual stress of the alloy disk after high speed rotation provided in example 3 of the present invention;
FIG. 6 is a chordal residual stress for the alloy disk after high speed rotation provided in comparative example 1;
FIG. 7 is a chordwise residual stress profile of the alloy disk prior to high speed rotation provided in comparative example 3.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and the detailed description, but those skilled in the art will understand that the following described embodiments are some, not all, of the embodiments of the present invention, and are only used for illustrating the present invention, and should not be construed as limiting the scope of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The method for removing the residual stress in the high-temperature alloy part by vibration aging comprises the following steps:
adjusting the residual unbalance amount of the high-temperature alloy part to be 1-60 g.mm, and then rotating the high-temperature alloy part at a high speed; the high-temperature alloy part comprises any one of a disc part and an annular part.
According to the method, a traditional vibration exciter is abandoned, the high-temperature alloy part is processed into an eccentric system, the high-temperature alloy part is rotated to a certain rotating speed at a high speed and is close to the natural frequency of the high-temperature alloy part, resonance is triggered to form vibration stress, and therefore the residual stress in the high-temperature alloy part is superposed, plastic deformation occurs, and the residual stress in the high-temperature alloy part is removed in time effectiveness.
The method of the invention has more uniform vibration stress distribution and more uniform induced plastic deformation, can achieve better residual stress removing effect and can not generate new residual stress field distribution.
As in the different embodiments, the residual unbalance amount of the superalloy component can be adjusted to 1 g.mm, 2 g.mm, 5 g.mm, 10 g.mm, 15 g.mm, 20 g.mm, 25 g.mm, 30 g.mm, 35 g.mm, 40 g.mm, 45 g.mm, 50 g.mm, 55 g.mm, 60 g.mm, etc., such as 1 to 50 g.mm.
The residual unbalance is regulated and controlled within the range, so that enough vibration stress can be ensured to be caused and the stability of a high-speed rotating system can be ensured. When the residual unbalance is less than 1 g.mm, the induced vibration stress is low and is not enough for regulating and controlling the residual stress; when the residual unbalance is greater than 60g · mm, the vibration of the system is too large and is liable to destabilize.
In a specific embodiment of the invention, a dynamic balancing machine is used to adjust the residual unbalance of the superalloy component.
In a specific embodiment of the present invention, the high speed rotation is performed to generate resonance.
In another embodiment of the present invention, the method for calculating the rotation speed of the high-speed rotation includes: the adjusted high-temperature alloy part is rotated at a high speed, the vibration amplitude change is tested and analyzed, and the corresponding rotating speed is R when the vibration amplitude is maximum1Unit R/min, in R1And +/-5% is taken as the rotating speed of the high-temperature alloy piece.
In an embodiment of the present invention, the method for calculating the rotation speed of the high-speed rotation includes: and carrying out modal analysis by using finite element software to obtain the natural frequency of the high-temperature alloy part, namely the required target rotating speed. For an eccentric system, the natural frequency refers to the number of revolutions per second, i.e. the corresponding rotational speed.
In practice, the amplitude is at a maximum, i.e. the rotational frequency is equal to the natural frequency, when the rotational frequency of the piece of superalloy processed to be eccentric coincides with the natural frequency of the system. To achieve this operating speed, the two approaches described above can be used: (1) rotating the high-temperature alloy piece at a high speed, monitoring the change of the vibration amplitude, wherein the rotating speed corresponding to the maximum vibration amplitude is the target rotating speed; (2) and (4) obtaining through simulation calculation.
Furthermore, after the natural frequency is obtained through simulation calculation, the high-temperature alloy part is rotated at a high speed to obtain the rotating speed corresponding to the actual maximum vibration amplitude, and then the calculated value is corrected.
In a specific embodiment of the invention, the high-speed rotation speed is 10000-50000 r/min.
According to either of the two methods described above, the desired rotational speed of the high speed rotation is obtained, which may be 2000r/min, 3000r/min, 4000r/min, 5000r/min, 6000r/min, 8000r/min, 10000r/min, 15000r/min, 20000r/min, 25000r/min, 30000r/min, 35000r/min, 40000r/min, 45000r/min, 50000r/min, etc., as in different embodiments.
In a specific embodiment of the present invention, the time of the high speed rotation is 1-30 min.
As in the different embodiments, the time of the high speed rotation may be 1min, 5min, 10min, 15min, 20min, 25min, 30min, and the like.
In a specific embodiment of the invention, in the process of high-speed rotation, the vibration amplitude of the high-temperature alloy part is monitored, and the vibration amplitude of the high-temperature alloy part is controlled to be 5-100 μm. So as to ensure the vibration stress to regulate and control the residual stress and the stability of a high-speed rotating system.
In a specific embodiment of the present invention, the temperature T of the superalloy material at the time of the high-speed rotation satisfies: t is not less than T at room temperature0Wherein T is0Is the aging temperature of the high-temperature alloy material.
In the method of the present invention, the high speed rotation may be performed at room temperature or at elevated temperature, the maximum temperature not exceeding the ageing temperature of the superalloy material. The method is convenient to combine with temperature regulation and control in the load application process, can reduce the local yield strength of the material, and can more easily initiate plastic deformation, thereby regulating and controlling the residual stress.
In a specific embodiment of the invention, the high-temperature alloy piece is a high-temperature alloy piece subjected to solution heat treatment or a high-temperature alloy piece subjected to solution heat treatment and aging heat treatment.
In actual operation, the technological parameters of each step in the preparation of the high-temperature alloy piece can adopt the conventional methods. The specific heat treatment system of the solution heat treatment and the aging heat treatment of the high-temperature alloy part can be obtained by referring to the conventional heat treatment system of the existing corresponding high-temperature alloy.
In a particular embodiment of the invention, the superalloy comprises any of GH4169, GH4720Li, GH4738, GH4151, GH4251, GH40 4065A, FGH95, FGH96, FGH97 and FGH 98.
The invention also provides application of any one of the methods for removing the residual stress in the high-temperature alloy part through vibration aging in preparation of the high-temperature alloy part.
Example 1
The embodiment provides a method for removing residual stress in a GH4169 alloy disc part by vibration aging, which comprises the following steps:
(1) adopting vacuum induction smelting, electroslag remelting and vacuum consumable remelting smelting to obtain GH4169 alloy cast ingot, then carrying out homogenization heat treatment, forging and cogging to obtain a bar, upsetting a cake, carrying out die forging forming, and machining to obtain a disc shown in figure 1 (the size unit is mm).
(2) Carrying out solution heat treatment on the disc obtained in the step (1); specifically, the solution heat treatment includes: the solid solution temperature is 980 ℃ and the solid solution time is 3.5 h; the cooling mode after solid solution is oil cooling, and the cooling speed is about 200 ℃/min.
(3) And (3) adjusting the residual unbalance amount of the disc after the solution heat treatment in the step (2) by using a dynamic balancing machine to be 2 g.mm.
(4) Simulating a GH4169 alloy disc piece with a corresponding size, adjusting the residual unbalance amount to be 2 g.mm, and performing a rotation experiment at room temperature to obtain a graph of the change of the vibration amplitude of the GH4169 alloy disc piece with the rotation speed under rotation as shown in FIG. 2; as is clear from the figure, when the rotational speed of the disk member is close to 28000r/min, resonance is induced close to the natural frequency, and therefore the rotational speed of the high-speed rotational vibration aging treatment is set to 28000. + -.100 r/min.
(5) And (4) keeping the disc part with the residual unbalance adjusted in the step (3) at the rotating speed of 28000r/min for 10min to obtain the treated GH4169 alloy disc part.
(6) And (4) carrying out aging heat treatment on the disc piece obtained by the treatment in the step (5), wherein the heat treatment system is 720 ℃/8h +620 ℃/8h, and cooling in air.
Example 2
This example refers to the method of example 1, with the difference that: the steps (3) to (6) are different.
The steps (3) to (6) of this example are as follows:
(3) and (3) adjusting the residual unbalance amount of the disc after the solution heat treatment in the step (2) by using a dynamic balancing machine to be 30 g.mm.
(4) Simulating a GH4169 alloy disc piece with a corresponding size, adjusting the residual unbalance amount to be 30 g.mm, and performing a rotation experiment at room temperature to obtain a graph of the change of the vibration amplitude of the GH4169 alloy disc piece along with the rotation speed under rotation; analysis revealed that resonance occurred near the natural frequency of the disc when the rotational speed of the disc was near 28000r/min, and the rotational speed of the high-speed rotational vibratory aging treatment was set at 28000 r/min.
(5) And (4) keeping the disc part with the residual unbalance adjusted in the step (3) at the rotating speed of 28000r/min for 10min to obtain the treated GH4169 alloy disc part.
(6) And (4) carrying out aging heat treatment on the disc piece obtained by the treatment in the step (5), wherein the heat treatment system is 720 ℃/8h +620 ℃/8h, and cooling in air.
Example 3
The embodiment provides a method for removing residual stress in a GH4169 alloy disc part by vibration aging, and the difference is that in the embodiment, after solution heat treatment and aging heat treatment are carried out on the GH4169 alloy disc part, vibration aging is carried out again, the rotating speed for inducing resonance is about 28500r/min, and the rest conditions are the same.
Comparative example 1
Comparative example 1 the process of example 1 was referenced with the difference that: the steps (3) to (6) are different.
Steps (3) to (6) of comparative example 1 are as follows:
(3) and (3) adjusting the residual unbalance amount of the disc after the solution heat treatment in the step (2) by using a dynamic balancing machine to be 0.2 g.mm.
(4) Simulating a GH4169 alloy disc piece with a corresponding size, adjusting the residual unbalance amount to be 0.2 g.mm, and performing a rotation experiment at room temperature to obtain a graph of the change of the vibration amplitude of the GH4169 alloy disc piece along with the rotation speed under rotation; analysis revealed that resonance occurred near the natural frequency of the disc when the rotational speed of the disc was near 28000r/min, and the rotational speed of the high-speed rotational vibratory aging treatment was set at 28000 r/min.
(5) And (4) keeping the disc part with the residual unbalance adjusted in the step (3) at the rotating speed of 28000r/min for 10min to obtain the treated GH4169 alloy disc part.
(6) And (4) carrying out aging heat treatment on the disc piece obtained by the treatment in the step (5), wherein the heat treatment system is 720 ℃/8h +620 ℃/8h, and cooling in air.
Comparative example 2
Comparative example 2 the process of example 1 was referenced, with the following differences: the steps (3) to (4) are different.
Steps (3) to (4) of comparative example 2 are as follows:
(3) and (3) adjusting the residual unbalance amount of the disc after the solution heat treatment in the step (2) by using a dynamic balancing machine to be 80 g.mm.
(4) Simulating a GH4169 alloy disc with a corresponding size, adjusting the residual unbalance amount to 80 g.mm, and performing a rotation experiment to obtain that the target rotation speed of the GH4169 alloy disc is still about 28000 r/min. However, the vibration amplitude is already over 150 μm, and a long stay at this speed may cause the rotor transition or shaft to break. Therefore, when the residual unbalance amount is high, the system cannot maintain the hold time of 10 min.
Comparative example 3
Comparative example 3 the process of example 1 was referenced, with the following differences: the vibration aging is not carried out, and the concrete steps are as follows:
(1) adopting vacuum induction smelting, electroslag remelting and vacuum consumable remelting smelting to obtain GH4169 alloy cast ingot, then carrying out homogenization heat treatment, forging and cogging to obtain a bar, upsetting a cake, carrying out die forging forming, and machining to obtain a disc shown in figure 1 (the size unit is mm).
(2) Carrying out solution heat treatment on the disc obtained in the step (1); specifically, the solution heat treatment includes: the solid solution temperature is 980 ℃ and the solid solution time is 3.5 h; the cooling mode after solid solution is oil cooling, and the cooling speed is about 200 ℃/min.
(3) And (3) carrying out aging heat treatment on the disc piece obtained by the treatment in the step (2), wherein the heat treatment system is 720 ℃/8h +620 ℃/8h, and cooling in air.
Experimental example 1
The residual stress of the treated superalloy disks of the different examples and comparative examples was measured by a profile method. As shown in fig. 3, which is the chordal residual stress of the GH4169 disc after the high speed rotation induced vibratory aging + aging treatment in example 1, it can be seen that the internal residual stress of the alloy disc treated by the method of example 1 of the present invention was reduced by about 60%, and the distribution pattern of the residual stress was not changed. Fig. 4 to 7 show the chord-wise residual stress of the disc processed in examples 2 and 3 and comparative examples 1 and 3, respectively, and it can be seen that the internal residual stress of the alloy disc processed by the method of the present invention can be significantly reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The method for removing the residual stress in the high-temperature alloy part by vibration aging is characterized by comprising the following steps of:
adjusting the residual unbalance amount of the high-temperature alloy part to be 1-60 g.mm, and then rotating the high-temperature alloy part at a high speed; the high-temperature alloy part comprises any one of a disc part and an annular part.
2. The method for removing the residual stress in the high-temperature alloy part through vibratory aging according to claim 1, wherein the residual unbalance amount of the high-temperature alloy part is adjusted to be 1-50 g-mm;
preferably, a dynamic balancing machine is adopted to adjust the residual unbalance amount of the high-temperature alloy piece.
3. The method of vibratory aging removal of residual stresses within a superalloy article according to claim 1, wherein the high speed rotation is performed to create resonance.
4. The method for removing residual stress inside a high-temperature alloy part through vibratory aging according to claim 1, wherein the calculation method of the rotating speed of high-speed rotation comprises the following steps: the adjusted high-temperature alloy part is rotated at a high speed, the vibration amplitude change is tested and analyzed, and the corresponding rotating speed is R when the vibration amplitude is maximum1Unit R/min, in R1And +/-5% is taken as the rotating speed of the high-temperature alloy piece.
5. The method for removing residual stress inside a high-temperature alloy part through vibratory aging according to claim 1, wherein the calculation method of the rotating speed of high-speed rotation comprises the following steps: and carrying out modal analysis by using finite element software to obtain the natural frequency of the high-temperature alloy part, namely the required target rotating speed.
6. The method for removing the residual stress in the high-temperature alloy part through vibration aging according to claim 1, wherein the rotating speed of the high-speed rotation is 2000-50000 r/min.
7. The method for removing the residual stress in the high-temperature alloy part through vibratory aging according to claim 1, wherein the time of the high-speed rotation is 1-30 min.
8. The method for removing residual stress in a high-temperature alloy part through vibration aging according to claim 1, wherein in the process of high-speed rotation, the vibration amplitude of the high-temperature alloy part is monitored, and the vibration amplitude of the high-temperature alloy part is controlled to be 5-100 μm.
9. The method for vibratory aging removal of residual stresses within a superalloy article according to claim 1, wherein the temperature T of the superalloy article at the high speed of rotation is such that: t is not less than T at room temperature0Wherein T is0Is the aging temperature of the material of the superalloy;
preferably, the superalloy comprises any one of GH4169, GH4720Li, GH4738, GH4151, GH4251, GH4065A, FGH95, FGH96, FGH97 and FGH 98.
10. Use of a method of vibratory ageing removal of residual stresses within a superalloy component as claimed in any of claims 1 to 9 in the manufacture of a superalloy component.
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| CN112342368A (en) * | 2020-10-16 | 2021-02-09 | 中国航发北京航空材料研究院 | Process method for reducing residual stress of deformed high-temperature alloy disc by rotation method |
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| US20120006452A1 (en) * | 2010-07-12 | 2012-01-12 | Rolls-Royce Plc | Method of improving the mechanical properties of a component |
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