Hot working method for improving structure uniformity of additive manufacturing nickel-based high-temperature alloy

A nickel-based superalloy and additive manufacturing technology, applied in the field of additive manufacturing, can solve problems such as grain growth, and achieve the effect of good application prospects

Pending Publication Date: 2021-01-08
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

[0006] The present invention is designed to provide a thermal processing method for improving the microstructure uniformity of additively manufactured nickel-base superalloys aimed at the above-mentioned existing domestic technical conditions. The unique advantages of processing and thermal processing deformation can effectively reduce or eliminate element segregation and interdendritic eutectic precipitation phases, and at the same time avoid serious grain growth during homogenization, and finally close the electron beam fuse additive through reasonable thermal deformation Manufacture defects such as pores and holes inside the preform, and obtain GH4169 components with fine and uniform recrystallized grain structure

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  • Hot working method for improving structure uniformity of additive manufacturing nickel-based high-temperature alloy

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Embodiment 1

[0027] The technical scheme of the present invention will be further described below in conjunction with accompanying drawing and embodiment:

[0028] Adopt the method of the present invention to improve the step of the thermal processing method of additive manufacturing nickel-base superalloy structure uniformity as follows:

[0029] Step 1. Reasonably design the three-dimensional model of the additively manufactured preform according to the size and shape of the part, using a diameter of The GH4169 alloy wire is deposited layer by layer on the substrate to prepare the high-temperature alloy preform by using the electron beam fuse additive method. The trace elements in the GH4169 alloy are P<0.01, Si<0.05, S<0.001, N<0.005;

[0030] Step 2. Use wire cutting to cut off the substrate, and perform incomplete homogenization on the surface of the preform manufactured by electron beam fuse additive manufacturing: the electron beam fuse additive GH4169 alloy preform is placed in a ...

Embodiment 2

[0037] Adopt the method of the present invention to improve the step of the thermal processing method of additive manufacturing nickel-base superalloy structure uniformity as follows:

[0038] Step 1. Reasonably design the three-dimensional model of the additively manufactured preform according to the size and shape of the part, using a diameter of The GH4169 alloy wire is deposited layer by layer on the substrate to prepare the high-temperature alloy preform by using the electron beam fuse additive method. The trace elements in the GH4169 alloy are P<0.01, Si<0.05, S<0.001, N<0.005;

[0039] Step 2. Use wire cutting to cut off the substrate, and perform incomplete homogenization on the surface of the preform manufactured by electron beam fuse additive manufacturing: the electron beam fuse additive GH4169 alloy preform is placed in a heating furnace below 300°C In the middle, heat up to 1110°C with the furnace, keep warm for 3 hours and then slowly cool down to below 300°C wi...

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Abstract

The invention relates to a hot working method for improving the structure uniformity of an additive manufacturing nickel-based high-temperature alloy. The method comprises the following steps of: firstly, preparing a GH4169 alloy prefabricated blank by adopting an electron beam fuse additive manufacturing method; then carrying out incomplete homogenization treatment of heat preservation for 1-5 hours at the temperature of 1080-1120 DEG C; and finally, carrying out forging deformation on the prefabricated blank in the direction vertical to the additive stacking direction. According to the process, a treatment method of incomplete homogenizing annealing and forging deformation is adopted, so that element segregation is reduced, brittle Laves phases are eliminated, the deformation plasticityof the additive manufacturing GH4169 alloy is improved, pores and incomplete fusion defects in an additive manufacturing alloy prefabricated blank are effectively closed, a deposited thick columnar structure is fully broken, and the recrystallization degree of the alloy and the uniformity of the grain tissues are improved, so that the tissue property of the additive manufacturing high-temperaturealloy is improved, thereby providing a powerful guarantee for applying the electron beam fuse additive manufacturing GH4169 alloy parts successfully in key force bearing components of weapon equipment.

Description

technical field [0001] The invention relates to a thermal processing method for improving the microstructure uniformity of a nickel-based superalloy manufactured by additive manufacturing, and belongs to the technical field of additive manufacturing. Background technique [0002] GH4169 superalloy alloy is a precipitation hardening Fe-Ni-Cr based deformed superalloy, because of its high tensile strength and good corrosion resistance and fatigue performance at -253 ° C ~ 650 ° C, it is used in aerospace and other fields have been widely used. With the increasingly complex structure and performance requirements of weapons and equipment, higher requirements are placed on the manufacturability and economy of material forming. The traditional preparation method of GH4169 alloy components is mainly the casting and forging process. The GH4169 alloy components formed by casting and forging have excellent comprehensive performance, but the problems of long processing cycle, low mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B22F3/24B33Y10/00B33Y40/20C22C1/04C22F1/10
CPCB22F3/24C22C1/0433B33Y10/00B33Y40/20C22F1/10B22F2003/247B22F2003/248Y02P10/25
Inventor 兰博张国栋张学军李凯李伟于勇
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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