Method for regulating and controlling precipitated phase gradient distribution of high-temperature alloy complex thin-wall component based on laser shock

Abstract

A method for regulating and controlling gradient distribution of a precipitated phase of a high-temperature alloy complex thin-wall component based on laser shock comprises the following steps: carrying out solution treatment before shock, redissolving the precipitated phase in an alloy to improve the degree of supersaturation of a matrix, and further constructing dislocation density in gradient distribution by utilizing laser shock; in the aging treatment, gradient precipitation of a precipitated phase is realized by utilizing the influence difference of different dislocation densities on the precipitation behavior of the precipitated phase, and the regulation and control of the precipitated phase gradient distribution characteristics, namely the size gradient and the volume fraction gradient, in the high-temperature alloy thin-wall component are realized by coordinating laser shock parameters and aging treatment parameters; the gradient distribution regulation and control of the precipitated phase can be realized, and the method is suitable for the precipitated phase regulation and control of a complex thin-wall component.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal material forming manufacturing, and particularly relates to a method for regulating the gradient distribution of precipitation phases in complex thin-walled components of superalloys based on laser shock. Background Art

[0002] The microstructure of superalloys, especially the size, distribution, and morphology of precipitation phases, has a decisive influence on their mechanical properties. Generally, the mechanical properties can be effectively regulated by controlling the characteristics of precipitation phases. The regulation of the gradient distribution of precipitation phases in superalloys refers to achieving a gradient distribution of the size and content of precipitation phases in a homogeneous grain matrix through specific process means, and simultaneously improving strength and toughness by means of the strengthening effect of the gradient structure.

[0003] At present, the regulation of precipitation phases in superalloys is mainly achieved by adjusting heat treatment systems, such as parameters related to thermal history, such as heating temperature, holding time, etc. (Qu Jinglong, Yi Chushan, Chen Jingwei, etc., Research progress of precipitation phases in GH4720Li alloy [J / OL], Journal of Materials Engineering, 2020, 73 - 83). The process freedom of this regulation method is relatively limited, and it is difficult to achieve heterogeneous distribution of precipitation phases. During aging treatment, dislocations generated by deformation will affect the nucleation and growth of precipitation phases through pipe diffusion effects (i.e., strain-induced precipitation), and thus affect the size and volume fraction (content) of precipitation phases (Zhang Panpan, Cheng Xiaonong, Luo Rui, etc., Strain-induced precipitation behavior of a new Fe-Cr-Ni heat-resistant alloy [J / OL], Journal of Iron and Steel Research, 2019, 64 - 71). However, conventional deformation methods such as compression and tension are difficult to achieve the regulation of the spatial distribution of dislocations. In addition, although local heat treatment with different heat treatment systems applied to different regions of components can also achieve a gradient distribution of precipitation phases, it is difficult to apply to the regulation of precipitation phases in complex thin-walled components.

[0004] Surface treatment technologies such as shot peening, ultrasonic roller pressing, surface mechanical attrition treatment, and laser shock can introduce gradient-distributed deformed microstructures in metal materials. Among them, laser shock has advantages such as strong controllability and high adaptability and has been widely used (Cao Xiaodie, Li Yinghua, Yang Yuqi, etc. Laser shock peening mechanism and its application in aviation components [J / OL]. Surface Technology, 2025, 1 - 17.). However, laser shock that realizes rapid plastic deformation using shock waves can usually only achieve gradient-distributed deformed microstructures such as grain size and dislocations, and it is difficult to achieve the regulation of the gradient distribution of precipitation phases. Summary of the Invention

[0005] In order to overcome the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a method for regulating the gradient distribution of precipitation phases in complex thin-walled components of superalloys based on laser shock, which can achieve the regulation of the gradient distribution of precipitation phases and is applicable to the regulation of precipitation phases in complex thin-walled components.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A method for regulating the gradient distribution of precipitates in a complex thin-walled component of a superalloy based on laser shock. By performing solution treatment before shock, the precipitates in the alloy are redissolved to increase the matrix supersaturation, and then laser shock is used to construct a dislocation density with a gradient distribution. In the aging treatment, the difference in the influence of different dislocation densities on the precipitation behavior of precipitates is utilized to achieve the gradient precipitation of precipitates. By coordinating the laser shock parameters and aging treatment parameters, the gradient distribution characteristics of precipitates in the thin-walled component of the superalloy, namely the gradient of size and the gradient of volume fraction, are regulated.

[0008] A method for regulating the gradient distribution of precipitates in a complex thin-walled component of a superalloy based on laser shock includes the following steps:

[0009] Step 1, perform solution treatment on the complex thin-walled component of the superalloy: After holding at the solution / sub-solution temperature of the superalloy for a certain time, cool to room temperature to dissolve the pre-existing precipitates in the matrix and obtain a supersaturated solid solution;

[0010] Step 2, perform laser shock treatment on the complex thin-walled component of the superalloy after the solution treatment in Step 1: The laser energy is 5 - 9 J, the spot size is 2 mm, and the number of shocks is 1 - 3 times. By adjusting different laser shock parameters, a gradient distribution of dislocation density from the surface to the core of the complex thin-walled component of the superalloy is achieved;

[0011] Step 3, perform aging treatment on the complex thin-walled component of the superalloy obtained in Step 2: Adopt a two-stage aging system, and utilize the influence law of dislocation and other deformed structures on the nucleation and growth behavior of precipitates in the superalloy to achieve the gradient precipitation behavior of precipitates induced by the gradient distribution of dislocation density.

[0012] The solution treatment in Step 1 adopts furnace heating, the heating rate is controlled between 10 °C / min, the solution temperature is controlled between 1000 - 1200 °C, the holding time is controlled between 1 - 2 h, and after the holding ends, it is cooled to room temperature.

[0013] In Step 2, by performing double-sided shock on the complex thin-walled component of the superalloy, a two-way gradient distribution of dislocation density is achieved.

[0014] The two-stage aging system in Step 3 is furnace heating, the heating rate is 10 °C / min, after heating to 720 °C - 800 °C, hold for 8 - 10 h, and then cool to 600 °C - 650 °C with the furnace in 1.5 h and hold for 7 - 9 h.

[0015] In Step 2, the device used for laser shock peening includes an industrial robot 1. The end of the industrial robot 1 holds a complex thin-walled component 2 of superalloy, and adjusts the laser shock position. A laser generator 4 generates a laser beam acting on the surface of the complex thin-walled component 2 of superalloy to perform laser shock on the inner and outer walls of the complex thin-walled component 2 of superalloy. A water spraying device 3 with flowing water as the constraint layer constrains the plasma during the laser shock process to form a high-pressure shock wave.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] 1. The present invention realizes the regulation of the precipitation phase gradient of the complex thin-walled component of superalloy through the sequential coupling treatment of laser shock, solution treatment, and aging treatment, and achieves precise regulation of the precipitation phase gradient characteristics (volume fraction gradient, size gradient), with the advantages of strong operability and good adaptability.

[0018] 2. The present invention constructs a gradient distribution of precipitation phases in the complex thin-walled component of superalloy. By virtue of the breakthrough of the gradient structure in the trade-off between strength and toughness, the strength and toughness of the thin-walled component of superalloy are simultaneously improved, endowing the complex thin-walled component of superalloy with a wider service condition.

[0019] 3. The laser shock adopted by the present invention has high controllability, is suitable for the thin-walled component of superalloy with complex geometric structures, and has little influence on the dimensional accuracy of the thin-walled component of superalloy. By adjusting the laser optical path, precise treatment can be realized for complex feature components such as curved surfaces, micro-holes, thin ribs, and overhanging structures. Description of the Drawings

[0020] Figure 1 It is a schematic diagram of the device adopted for laser shock in the embodiment of the present invention. Detailed Embodiment

[0021] The present invention will be described in more detail below in conjunction with the embodiments and the drawings.

[0022] Embodiment 1: In this embodiment, an arc additive manufacturing GH4169 nickel-based superalloy complex thin-walled component is used, and a method for regulating the precipitation phase gradient distribution of the complex thin-walled component of superalloy based on laser shock includes the following steps:

[0023] Step 1, solution treatment of the superalloy thin-walled component: The superalloy thin-walled component is heated in the furnace at a heating rate of 10 °C / min. The solution treatment temperature is 1000 °C, and it is held for 1 h. After the holding is completed, it is taken out of the furnace and air-cooled to room temperature to dissolve the pre-precipitated phase in the matrix and obtain a supersaturated solid solution. Through solution treatment, the superalloy is homogenized, providing a basis for subsequent gradient regulation of the precipitated phase based on laser shock, reducing the deformation resistance during the subsequent laser shock process, and facilitating the introduction of a more significant gradient deformation structure, that is, a dislocation density with an obvious gradient characteristic distribution.

[0024] Step 2, perform the first laser shock treatment on the superalloy thin-walled component after the solution treatment in Step 1: The laser energy is 5 J, the spot size is 2 mm, and the number of shocks is 1 time. By adjusting different laser shock parameters, a gradient distribution of dislocation density from the surface to the core of the superalloy thin-walled component is achieved. Additionally, through double-sided shock of the superalloy thin-walled component, a bidirectional gradient distribution of dislocation density can be realized.

[0025] Step 3, perform aging treatment on the superalloy thin-walled component obtained in Step 2: Adopt a two-stage aging system. The superalloy thin-walled component is heated in the furnace at a heating rate of 10 °C / min. After heating to 720 °C, it is held for 8 h, and then cooled in the furnace to 600 °C over 1.5 h and held for 7 h. After the holding is completed, the superalloy thin-walled component is taken out and air-cooled to room temperature. Utilize the influence law of the dislocation pipe diffusion effect on the size and volume fraction of the precipitated phase to realize the precipitated phase gradient precipitation behavior induced by the dislocation gradient distribution. In addition, based on the double-sided shock in Step 2, a bidirectional gradient distribution of the precipitated phase can also be constructed in the superalloy thin-walled component.

[0026] Refer to Figure 1 , the device used for the laser shock treatment in Step 2 includes an industrial robot 1. The end of the industrial robot 1 holds the complex thin-walled superalloy component 2 to adjust the laser shock position. The laser generator 4 generates a laser beam acting on the surface of the complex thin-walled superalloy component 2 to perform laser shock on the inner and outer walls of the complex thin-walled superalloy component 2. The water spraying device 3 with flowing water as the constraint layer constrains the plasma during the laser shock process to form a high-pressure shock wave.

[0027] Example 2: In this example, an arc additive manufacturing GH4169 nickel-based superalloy complex thin-walled component is used. A method for regulating the gradient distribution of precipitated phases in a superalloy complex thin-walled component based on laser shock includes the following steps:

[0028] Step 1, solution treatment of the superalloy complex thin-walled component: The superalloy thin-walled component is heated in the furnace at a heating rate of 10 °C / min. The solution treatment temperature is 1200 °C, and it is held for 2 h. After the holding is completed, it is taken out of the furnace and air-cooled to room temperature to dissolve the pre-precipitated phase in the matrix and obtain a supersaturated solid solution; through solution treatment, the superalloy is homogenized, providing a basis for subsequent gradient regulation of the precipitated phase based on laser shock, reducing the deformation resistance during subsequent laser shock, and facilitating the introduction of a more significant gradient deformation structure, that is, the dislocation density showing an obvious gradient characteristic distribution.

[0029] Step 2, perform the first laser shock treatment on the superalloy complex thin-walled component after the solution treatment in Step 1: The laser energy is 7 J, the spot size is 2 mm, and the number of shocks is 2 times. By adjusting different laser shock parameters, a gradient distribution of dislocation density from the surface to the core of the superalloy thin-walled component is achieved. Additionally, through double-sided shock of the superalloy thin-walled component, a two-way gradient distribution of dislocation density can be realized.

[0030] Step 3, perform aging treatment on the superalloy thin-walled component obtained in Step 2: Adopt a two-stage aging system. The superalloy thin-walled component is heated in the furnace at a heating rate of 10 °C / min. After heating to 800 °C, it is held for 9 h, and then cooled in the furnace for 1.5 h to 620 °C and held for 9 h. After the holding is completed, the superalloy thin-walled component is taken out and air-cooled to room temperature. Utilize the influence law of the dislocation pipe diffusion effect on the size and volume fraction of the precipitated phase to realize the precipitated phase gradient precipitation behavior induced by the dislocation gradient distribution; in addition, based on the double-sided shock in Step 2, a two-way gradient distribution of the precipitated phase can also be constructed in the superalloy thin-walled component.

[0031] The device used for the laser shock treatment in Step 2 of this embodiment is the same as that in Embodiment 1.

[0032] Embodiment 3: In this embodiment, an arc additive manufacturing GH4169 nickel-based superalloy complex thin-walled component is used. A method for regulating the gradient distribution of precipitated phases in a superalloy complex thin-walled component based on laser shock includes the following steps:

[0033] Step 1, solution treatment of the arc additive manufacturing superalloy complex thin-walled component: The superalloy thin-walled component is heated in the furnace at a heating rate of 10 °C / min. The solution treatment temperature is 1100 °C, and it is held for 1.5 h. After the holding is completed, it is taken out of the furnace and air-cooled to room temperature to dissolve the pre-precipitated phase in the matrix and obtain a supersaturated solid solution; through solution treatment, the superalloy is homogenized, providing a basis for subsequent gradient regulation of the precipitated phase based on laser shock, reducing the deformation resistance during subsequent laser shock, and facilitating the introduction of a more significant gradient deformation structure, that is, the dislocation density showing an obvious gradient characteristic distribution.

[0034] Step 2: Perform the first laser shock peening on the superalloy complex thin-walled component after solution treatment in Step 1. The laser energy is 9 J, the spot size is 2 mm, and the number of impacts is 3 times. By adjusting different laser shock parameters, a gradient distribution of dislocation density from the surface to the core of the superalloy thin-walled component is achieved. Additionally, through double-sided shock peening of the superalloy thin-walled component, a bidirectional gradient distribution of dislocation density can be realized.

[0035] Step 3: Perform aging treatment on the superalloy thin-walled component obtained in Step 2. Adopt a two-stage aging regime. The superalloy thin-walled component is heated in the furnace at a heating rate of 10 °C / min. After heating to 760 °C, it is held for 10 h, and then cooled in the furnace to 650 °C over 1.5 h and held for 8 h. After the holding is completed, the superalloy thin-walled component is taken out and air-cooled to room temperature. Utilize the influence law of the dislocation pipe diffusion effect on the size and volume fraction of the precipitates to achieve the precipitation behavior of the precipitates induced by the dislocation gradient distribution. In addition, based on the double-sided shock peening in Step 2, a bidirectional gradient distribution of precipitates can also be constructed in the superalloy complex thin-walled component.

[0036] The device used for laser shock peening in Step 2 of this embodiment is the same as that in Example 1.

[0037] The above Examples 1 to 3 can obtain different gradient distribution characteristics of precipitates.

[0038] The above embodiments are only preferred embodiments of the present invention and do not constitute a limitation on the protection scope of the present invention. Any direct or equivalent modifications, substitutions, or improvements based on the core principle of the present invention should be considered to fall within the protection scope of the present invention. The protection scope of the present invention shall be determined by the content defined in the claims, including but not limited to the above embodiments and all equivalent embodiments thereof.

Claims

1. A method for regulating the precipitated phase gradient distribution of complex thin-walled components of high-temperature alloys based on laser shock, characterized in that: By carrying out solid solution treatment before impact, the precipitate phase in the alloy is dissolved back to increase the supersaturation of the matrix, and then laser shock is used to construct a dislocation density with a gradient distribution. During the aging treatment, the difference in the influence of different dislocation densities on the precipitation behavior of the precipitate phase is utilized to achieve the gradient precipitation of the precipitate phase. By coordinating the laser shock parameters and the aging treatment parameters, the gradient distribution characteristics of the precipitate phase in the high-temperature alloy thin-walled components, namely the size gradient and volume fraction gradient, are regulated.

2. The method according to claim 1, characterized in that , including the following steps: Step 1, performing solid solution treatment on the complex thin-walled component of the high-temperature alloy: after keeping the high-temperature alloy at the solid solution / sub-solid solution temperature for a certain period of time, cooling to room temperature, dissolving the pre-precipitated phase in the matrix, and obtaining a supersaturated solid solution; Step 2, performing laser shock treatment on the complex thin-walled component of the high-temperature alloy after the solid solution treatment in step 1: laser energy 5-9J, spot size 2mm, shock times 1-3 times, by adjusting different laser shock parameters, to achieve a gradient distribution of dislocation density from the surface to the core of the complex thin-walled component of the high-temperature alloy; Step 3, performing aging treatment on the complex thin-walled component of the high-temperature alloy obtained in step 2: adopting a two-stage aging system, utilizing the influence of deformation structures such as dislocations on the nucleation and growth behavior of the precipitation phase of the high-temperature alloy, and realizing the gradient precipitation behavior of the precipitation phase of the high-temperature alloy induced by the gradient distribution of dislocation density.

3. The method according to claim 2, characterized in that: The solution treatment in step 1 is carried out by furnace heating, the heating rate is controlled between 10°C / min, the solution temperature is controlled between 1000 and 1200°C, the insulation time is controlled between 1 and 2 hours, and the solution is cooled to room temperature after the insulation is completed.

4. The method according to claim 2, characterized in that: The step 2 achieves a bidirectional gradient distribution of dislocation density by impacting the complex thin-walled component of the high-temperature alloy on both sides.

5. The method according to claim 2, characterized in that: The double-stage aging system in step 3 is furnace heating with a heating rate of 10°C / min, heating to 720°C-800°C and then keeping warm for 8-10 hours, then cooling to 600°C-650°C after 1.5 hours and keeping warm for 7-9 hours.

6. The device used for laser shock treatment in step 2 of the method of claim 2, characterized in that: The invention comprises an industrial robot (1), wherein the end of the industrial robot (1) clamps a high-temperature alloy complex thin-wall component (2) and adjusts the laser impact position; a laser generator (4) generates a laser beam acting on the surface of the high-temperature alloy complex thin-wall component (2) and performs laser impact on the inner and outer walls of the high-temperature alloy complex thin-wall component (2); and a water spray device (3) using flowing water as a constraint layer constrains plasma during the laser impact process to form a high-pressure shock wave.

Images