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Method for controlling brittleness Laves phases in laser additive manufacturing process of nickel-based high-temperature alloy

A nickel-based superalloy, laser additive technology, applied in the direction of additive manufacturing, additive processing, energy efficiency improvement, etc., can solve the problem of not completely removing long-chain Laves, reduce cracking sensitivity, and reduce useful alloying elements. Segregation, the effect of reducing heat accumulation

Inactive Publication Date: 2016-11-09
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Y.Chen et al. and Y.C.Zhang et al. studied the effects of substrate continuous water cooling and liquid nitrogen cooling on the microstructure of laser-deposited 718 alloy, and found that increasing the substrate cooling rate can reduce Nb element segregation and Laves phase formation, but not Long-chain Laves phase not completely removed

Method used

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  • Method for controlling brittleness Laves phases in laser additive manufacturing process of nickel-based high-temperature alloy
  • Method for controlling brittleness Laves phases in laser additive manufacturing process of nickel-based high-temperature alloy
  • Method for controlling brittleness Laves phases in laser additive manufacturing process of nickel-based high-temperature alloy

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Embodiment 1

[0023] S1. Preliminarily optimize the process parameters of laser additive manufacturing, obtain the preliminary laser additive manufacturing process window, and optimize the parameters: the average laser power is 400W, the scanning speed is 6mm / s, the powder feeding amount is 8g / min, and the spot diameter is 1 ~2mm, carrier gas flow rate 10L / min;

[0024] S2. Use tap water to cool the bottom of the nickel-based substrate to reduce heat accumulation during the forming process;

[0025] S3. Carry out laser additive manufacturing of nickel-based superalloys. The laser light source is controlled by a square wave. The parameters of the square wave are: peak power: 600W, pulse frequency: 10HZ-100HZ, duty cycle: 0.6.

[0026] figure 2 It is the metallographic structure map obtained by adopting the laser modulation method of the present invention; from figure 2 It can be seen that the metallographic structure is composed of fine equiaxed dendrites; figure 1 The metallographic st...

Embodiment 2

[0032] S1. Preliminarily optimize the process parameters of laser additive manufacturing, obtain the preliminary laser additive manufacturing process window, and optimize the parameters: the average laser power is 400W, the scanning speed is 10mm / s, the powder feeding amount is 12g / min, and the spot diameter is 1 ~2mm, carrier gas flow rate 12L / min;

[0033] S2. Use tap water to cool the bottom of the nickel-based substrate to reduce heat accumulation during the forming process;

[0034] S3. Carry out laser additive manufacturing of nickel-based superalloys. The laser light source is controlled by a sawtooth wave. The parameters of the sawtooth wave are: peak 900W, valley 0W, pulse frequency: 90HZ.

Embodiment 3

[0036]S1. Preliminarily optimize the process parameters of laser additive manufacturing, obtain the preliminary laser additive manufacturing process window, and optimize the parameters: the average laser power is 600W, the scanning speed is 8mm / s, the powder feeding amount is 10g / min, and the spot diameter is 1mm , carrier gas flow rate 10L / min;

[0037] S2. Use liquid nitrogen to cool the bottom of the nickel-based substrate to reduce heat accumulation during the forming process;

[0038] S3. Carry out laser additive manufacturing of nickel-based superalloys. The laser light source is controlled by a sine wave. The parameters of the sine wave are: peak 700W, valley 0W, pulse frequency: 30HZ.

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Abstract

The invention discloses a method for controlling brittleness Laves phases in the laser additive manufacturing process of a nickel-based high-temperature alloy. Firstly, laser additive manufacturing technological parameters are initially optimized, and a cooling medium is adopted for cooling the bottom of a base material; then a laser modulation technology is used for modulating a laser source, and superior laser modulation parameters are obtained, wherein the peak power of square waves ranges from 600 W to 1000 W, the pulse frequency of the square waves ranges from 10 HZ to 100 HZ, and the duty ratio of the square waves ranges from 0.3 to 0.6; the wave peak power of sawtooth waves ranges from 600 W to 1200 W, the wave trough power of the sawtooth waves is 0 W, and the pulse frequency of the sawtooth waves ranges from 10 HZ to 100 HZ; and according to the parameters of sine waves, the wave peak power ranges from 600 W to 1000 W, the wave trough is 0 W, and the pulse frequency ranges from 10 HZ to 100 HZ; and finally, laser additive manufacturing and forming of the nickel-based high-temperature alloy are conducted according to the above parameters, and a formed part with all small equiaxial dendritic structures and small discrete Laves phases is obtained. By means of the laser modulation method, the precipitation behavior of the Laves phases in the laser additive manufacturing process of the nickel-based high-temperature alloy can be effectively controlled, the cracking sensibility of parts obtained through laser additive manufacturing is reduced, and the microstructure is improved.

Description

technical field [0001] The invention relates to the field of laser metal material processing, in particular to a method for controlling the brittle Laves phase in the process of laser additive manufacturing of nickel-based superalloys. Background technique [0002] Laser additive manufacturing technology is a technology that combines laser cladding and rapid prototyping. It is widely used in rapid prototyping, repair and surface modification of parts due to its high material utilization rate, short production cycle and low cost. Wait. Inconel 718 is a precipitation-strengthened, Nb-containing nickel-based superalloy, which is widely used for its excellent mechanical properties such as good structural stability, weldability, high-temperature strength, high-temperature fatigue, creep performance, and high-temperature oxidation resistance. Used in aerospace, nuclear industry and energy power and other fields. One of the most notable features of laser additive manufacturing of...

Claims

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Application Information

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IPC IPC(8): B22F3/105B33Y10/00B33Y50/02
CPCB33Y10/00B33Y50/02B22F10/00B22F12/43B22F10/322B22F10/25B22F12/90B22F10/36B22F10/31B22F12/20Y02P10/25
Inventor 宋立军肖辉李思萌肖文甲李言覃成满平
Owner HUNAN UNIV
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