CN-122007444-A - Lower surface forming method for nickel-based superalloy component with different angle suspension areas

CN122007444ACN 122007444 ACN122007444 ACN 122007444ACN-122007444-A

Abstract

A lower surface forming method of a component in a suspension area with different angles for nickel-based superalloy comprises the steps of obtaining component models and slicing to obtain a plurality of slice models, dividing each slice model into an unsupported suspension area and a solid area, setting laser selective melting forming parameters of the unsupported suspension area and the solid area, determining laser remelting times of the unsupported suspension area based on the laser selective melting forming parameters of the unsupported suspension area, paving nickel-based alloy powder layer by layer, firstly forming the solid area through a laser selective melting device, and then sequentially carrying out forming and multiple remelting of the unsupported suspension area until the laser selective melting device completes laser melting forming of all layers of nickel-based alloy powder, thereby obtaining the nickel-based alloy unsupported component. The method can obtain the nearly fully dense nickel-based alloy unsupported component with the lower breadth roughness Sa less than 20 mu m, the compactness higher than 99% and the buckling deformation degree lower than 100 mu m.

Inventors

LIN DANYANG
WANG YAJUN
TAN CAIWANG
LUO WENRUI
SONG XIAOGUO
MA RUI
BAI JIE
CHEN QIANG
ZHENG JUNCHAO
Cong Ziran
LI SAI

Assignees

哈尔滨工业大学
北京动力机械研究所

Dates

Publication Date: 20260512
Application Date: 20260228

Claims (10)

1. A method of forming a lower surface of a component for a nickel-base superalloy at different angles, comprising the steps of: acquiring a component model and slicing the component model to obtain a plurality of slice models; Dividing each slice model into an unsupported overhanging region and a solid region based on a plurality of slice models, wherein the overhanging angle of the unsupported overhanging region of the component model is 20-45 degrees; Setting laser selective melting forming parameters of the unsupported overhanging region and laser selective melting forming parameters of the solid region, wherein the heat input of the unsupported overhanging region is lower than that of the solid region; determining the laser remelting times of the unsupported overhanging region based on the laser selective melting forming parameters of the unsupported overhanging region; and paving nickel-base alloy powder layer by layer based on the forming parameters of the unsupported overhanging region and the forming parameters of the solid region, forming the solid region on each layer of nickel-base alloy powder by a laser selective melting device, then sequentially forming the unsupported overhanging region and remelting for a plurality of times, and sequentially repeating until the laser selective melting device completes laser melting forming of all layers of nickel-base alloy powder, thereby obtaining the nickel-base alloy unsupported member.
2. The method for forming the lower surface of a member having a different angle depending from a nickel-based superalloy as defined in claim 1, wherein the nickel-based alloy powder comprises, by mass, 20% -24% of Cr, 13% -15% of W, 1% -3% of Mo, 0.05% -0.2% of C, 0.2% -0.5% of Si, 0.2% -1% of Mn, 2% -4% of Co, 0.01% -0.1% of La, 1% -3% of Fe, less than 1% of Al, less than 0.1% of Ti, less than 0.5% of Cu, less than 0.01% of B, and the balance of Ni and unavoidable impurities.
3. The method of forming a lower surface of a component for different angle overhang regions of a nickel-base superalloy as in claim 1, wherein prior to the step of acquiring a component model and slicing the component model, the method further comprises: drying nickel-base alloy powder with the particle size of 15-53 mu m in a vacuum environment-friendly drying oven, and safely storing for later use; designing a component model in three-dimensional software, wherein an overhang angle of an unsupported overhang region of the component model is 20 ° 45°。
4. The method of forming a lower surface of a component for different angles of overhang regions of a nickel-base superalloy as in claim 1, wherein said step of dividing each of said slice models into an unsupported overhang region and a solid region based on a plurality of said slice models comprises: Determining, based on a plurality of the slice models, a projected length and an overhang region angle of each of the slice models relative to adjacent slice models; Each of the slice models is divided into the unsupported overhanging region and the solid region based on the projected length and the overhanging region angle.
5. The method of forming a lower surface of a different angle overhang region member for nickel-base superalloys according to claim 4, wherein the unsupported overhang region length of each layer is 2 times the overhang length.
6. The method of forming a lower surface of a different angle suspension zone member for nickel-base superalloys according to claim 1, wherein the step of laying down nickel-base alloy powder layer by layer comprises: and prefabricating the dried nickel-based alloy powder in a powder feeding cabin, placing the cleaned substrate in a lifting table of a forming cabin, closing all cabin doors, introducing argon into the forming cabin until the oxygen content is lower than 100ppm, and preheating the substrate to 90-110 ℃.
7. The method of forming a lower surface of a nickel-base superalloy different angle overhang region member according to claim 1, wherein the laser selective melt forming parameters of the unsupported overhang region include overhang laser power, overhang scanning speed and overhang scanning pitch, the overhang laser power is 100w to 160w, the overhang scanning speed is 800mm/s to 1500mm/s, and the overhang scanning pitch is 0.07mm to 0.12mm.
8. The method for forming the lower surface of the nickel-based superalloy suspension region component with different angles according to claim 1, wherein the laser selective melting forming parameters of the solid region comprise solid laser power, solid scanning speed and solid scanning interval, the value range of the solid laser power is 185W-235W, the value range of the solid scanning speed is 600 mm/s-1000 mm/s, and the value range of the solid scanning interval is 0.07 mm-0.12 mm.
9. The method for forming the lower surface of the nickel-based superalloy different-angle overhang region component according to claim 1, wherein the laser scanning strategy of the unsupported overhang region is integral scanning, the laser scanning strategy of the solid region is 67-degree crossed strip scanning, and the value range of each layer of laying thickness of the nickel-based alloy powder is 0.02-0.05 mm.
10. The method of forming a lower surface of a different angle overhang region member for a nickel-base superalloy as in claim 1, wherein said step of determining a number of laser remelting passes for said unsupported overhang region comprises: Inputting the plurality of slice models, the laser selective melting forming parameters of the unsupported overhanging region, the laser selective melting forming parameters of the solid region and the laser remelting times of the unsupported overhanging region into the laser selective melting device to obtain a pre-demonstration nickel-based alloy unsupported member model; And determining that the laser selective melting forming parameters and the slicing model are correct based on the fact that the model of the nickel-based alloy non-support member predicted meets the standard.

Description

Lower surface forming method for nickel-based superalloy component with different angle suspension areas Technical Field The application relates to the technical field of laser additive manufacturing, in particular to a lower surface forming method for a nickel-based superalloy component with different angle overhang regions. Background With the development of technology, social production and demand, in the current precision industrial manufacturing, the rapid manufacturing and high-performance demand of complex structural parts are gradually increased, and higher requirements are put on the modern additive manufacturing technology. The Laser Powder Bed Fusion (LPBF) technology gradually becomes a core means for manufacturing high-added-value parts because of the integrated forming of complex geometric structures, shortening of production period and support of customized design. However, because the laser selective melting technology is used for manufacturing, the area lower than 45 DEG needs to be ensured to be formed by a supporting structure, however, for a component with an inner runner or a complex inner cavity, the supporting structure cannot be removed due to the structural characteristics of the component, and only low-angle forming can be performed. Because the inner cavity and the inner runner are not physically supported, serious defects are easy to occur near the overhanging region in the printing process, wherein the problems of scum and warping are most prominent, and the problem of serious roughness of the lower breadth can cause the reduction of normal engineering performance (such as runner heat dissipation) of the inner cavity structure, thereby seriously affecting the service performance. Disclosure of Invention In view of the foregoing, it is desirable to provide a method of forming the lower surface of a nickel-base superalloy different-angle overhang region member to achieve an improvement in the forming accuracy and lower-web roughness of the nickel-base alloy unsupported member without reducing the forming density of the nickel-base alloy unsupported member. The embodiment of the application provides a lower surface forming method for a nickel-based superalloy suspension region component with different angles, which comprises the following steps: acquiring a component model and slicing the component model to obtain a plurality of slice models; Dividing each slice model into an unsupported overhanging region and a solid region based on a plurality of slice models, wherein the overhanging angle of the unsupported overhanging region of the component model is 20-45 degrees; Setting laser selective melting forming parameters of the unsupported overhanging region and laser selective melting forming parameters of the solid region, wherein the heat input of the unsupported overhanging region is lower than that of the solid region; determining the laser remelting times of the unsupported overhanging region based on the laser selective melting forming parameters of the unsupported overhanging region; and paving nickel-base alloy powder layer by layer based on the forming parameters of the unsupported overhanging region and the forming parameters of the solid region, forming the solid region on each layer of nickel-base alloy powder by a laser selective melting device, then sequentially forming the unsupported overhanging region and remelting for a plurality of times, and sequentially repeating until the laser selective melting device completes laser melting forming of all layers of nickel-base alloy powder, thereby obtaining the nickel-base alloy unsupported member. In some embodiments, the nickel-based alloy powder comprises, by mass, 20% -24% of Cr, 13% -15% of W, 1% -3% of Mo, 0.05% -0.2% of C, 0.2% -0.5% of Si, 0.2% -1% of Mn, 2% -4% of Co, 0.01-0.1% of La, 1% -3% of Fe, less than 1% of Al, less than 0.1% of Ti, less than 0.5% of Cu, less than 0.01% of B, and the balance of Ni element and unavoidable impurities. In some embodiments, prior to the step of acquiring a component model and slicing the component model, the method further comprises: drying nickel-base alloy powder with the particle size of 15-53 mu m in a vacuum environment-friendly drying oven, and safely storing for later use; designing a component model in three-dimensional software, wherein the suspension angle of an unsupported suspension area of the component model is 20-45 degrees. In some embodiments, the step of dividing each of the slice models into an unsupported overhanging region and a solid region based on a plurality of the slice models specifically comprises: Determining, based on a plurality of the slice models, a projected length and an overhang region angle of each of the slice models relative to adjacent slice models; Each of the slice models is divided into the unsupported overhanging region and the solid region based on the projected length and the overhanging region angle. In some embodiments, the unsuppor