Inconel 625 alloy dendrite morphology method

An alloy and morphology technology, applied in the improvement of process efficiency, additive manufacturing, additive processing, etc., can solve the problem of lack of control of cobalt-based superalloy dendrite morphology, and achieve the effect of improving mechanical properties

Active Publication Date: 2020-03-31
FOSHAN UNIVERSITY
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Problems solved by technology

The above research provides a good insight and theoretical basis for laser additive manufacturing of Inconel 625 alloy microstructure and performance control. However, there is still a lack of effective methods to control the dendrite morphology of cobalt-based superalloys produced by laser additive manufacturing.

Method used

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  • Inconel 625 alloy dendrite morphology method
  • Inconel 625 alloy dendrite morphology method

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Embodiment 1

[0021] A method for Inconel625 alloy dendrite morphology, comprising the following steps:

[0022] (1) Set the main parameters of the laser additive manufacturing process, the laser peak power P is 500-1000W, the scanning speed V is 5-13mm / s, and the spot diameter D is 0.5-2.5mm;

[0023] (2) Use the parameters set in step (1) to perform laser additive forming on the Inconel625 alloy, and record the temperature change of the molten pool passing through the middle of the single-pass cladding layer during the laser additive forming process of the Inconel625 alloy to obtain a fixed-point temperature change curve;

[0024] (3) Obtain the fixed-point temperature change curve according to the step (2), calculate the peak temperature T of the fixed-point temperature change curve, the intercept t of the liquidus line and the temperature curve, and the average cooling rate ξ of the molten pool cooling stage;

[0025] (4) Repeat step (2) and step (3) 2 to 3 times, according to the fixe...

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Abstract

In the invention, a fixed-point temperature change curve is acquired through recording a temperature change when a molten pool passes through a middle position of a single-channel cladding layer during laser additional material forming process of Inconel 625 alloy. According to the fixed point temperature change curve, a peak temperature T of the fixed-point temperature change curve, an interceptt of a liquid phase line and a temperature curve, and an average cooling rate xi of a molten pool cooling stage are calculated. A laser additional material forming parameter of the Inconel 625 alloy is optimized, and finally a process parameter of columnar dendrites and the process parameter of equiaxed dendrites are obtained so as to realize adjustment and control of the Inconel 625 alloy dendrite morphology. A mechanical property of a formed part can be effectively increased.

Description

technical field [0001] The invention belongs to the field of metal additive manufacturing, and in particular relates to a method for dendrite morphology of Inconel625 alloy. Background technique [0002] Laser Additive Manufacturing (LAM) technology, also known as "laser 3D printing", uses high-energy laser beams as the heat source, taking into account the requirements of precise forming and high-performance forming. It has important application prospects in the rapid prototyping of high-performance complex metal parts. Nickel (Ni)-based superalloy is an austenitic metal material with high strength, good oxidation resistance, corrosion resistance and high stability under high temperature above 650 °C and complex stress. It is widely used in the manufacture of steam turbines and key components of aero-engines (such as casings, guide vanes, etc.). Inconel 625 alloy is one of the most commonly used nickel-based superalloys. At present, laser additive manufacturing of Inconel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/105B33Y50/00B33Y10/00
CPCB33Y50/00B33Y10/00B22F10/00B22F12/90B22F10/36B22F10/366B22F10/28Y02P10/25
Inventor 凡头文胡特王志鹏汤贤刘瑜梅轩朗
Owner FOSHAN UNIVERSITY
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