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A method to improve the internal quality of high-entropy alloys manufactured by laser additive manufacturing
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A high-entropy alloy and laser additive technology, applied in additive processing, additive manufacturing, etc., can solve problems such as difficult to guarantee internal quality, prone to pores, cracks, and reduced mechanical properties of formed parts
Active Publication Date: 2022-01-07
HUNAN UNIV
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However, due to the complex heat and mass transfer and dynamic non-equilibrium solidification process involved in the laser additive manufacturing process, it is difficult to guarantee the internal quality of the laser additive manufacturing of high-entropy alloys. For example, metallurgical defects such as pores and cracks are prone to occur, resulting in The mechanical properties drop sharply
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Embodiment 1
[0016] Take AlCoCrFeNi high entropy alloy as an example.
[0017] A method for improving the internal quality of laser additive manufacturing high-entropy alloys, comprising the following steps:
[0018] Step 1: First, the surface of the substrate is polished, ultrasonically cleaned and dried, and the substrate is preheated to 350°C with electromagnetic induction heating equipment;
[0019] Step 2: Use a thermal imager to monitor the molten pool during the laser additive manufacturing process, obtain the shape and temperature change information of the molten pool, calculate the average value a of the long axis of the molten pool and the average value b of the short axis, and calculate the average value of the molten pool The average cooling rate ξ of the boundary;
[0020] Step 3: According to 1.30≤a / b≤1.80, and 2.8×10 3 ℃ / s≤ξ≤1.9×10 4 ℃ / s principle to optimize the process parameters;
[0021] Step 4: The optimized process window obtained is as follows: the laser power is ...
Embodiment 2
[0026] Take FeCoCrNiMn high-entropy alloy as an example.
[0027] A method for improving the internal quality of laser additive manufacturing high-entropy alloys, comprising the following steps:
[0028] Step 1: First, the surface of the substrate is polished, ultrasonically cleaned and dried, and the substrate is preheated to 350°C with electromagnetic induction heating equipment;
[0029] Step 2: Use a thermal imager to monitor the molten pool during the laser additive manufacturing process, obtain the shape and temperature change information of the molten pool, calculate the average value a of the long axis of the molten pool and the average value b of the short axis, and calculate the average value of the molten pool The average cooling rate ξ of the boundary;
[0030] Step 3: According to 1.30≤a / b≤1.80, and 2.8×10 3 ℃ / s≤ξ≤1.9×10 4 ℃ / s principle to optimize the process parameters;
[0031] Step 4: The optimized process window obtained is as follows: the laser power is ...
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Abstract
The invention discloses a method for improving the internal quality of high-entropy alloy manufactured by laser additive manufacturing. First, preheat the substrate to 350°C; monitor the molten pool to obtain the shape and temperature information of the molten pool, calculate the average value a of the long axis of the molten pool and the average value b of the short axis, and calculate the average cooling of the molten pool boundary Rate ξ; according to 1.30≤a / b≤1.80, and 2.8×10 3 ℃ / s≤ξ≤1.9×10 4 The process parameters are optimized based on the ℃ / s principle, and the optimized process window is obtained: the laser power is 1250-1650W, the scanning speed is 12-14mm / s, the spot diameter is 4.5-5mm, and the powder feeding amount is 22-24g / min. The contact amount is 45%, and the increment Z in the height direction is 0.35~0.4 mm / layer. The invention can effectively avoid metallurgical defects, refine the solidified structure, and significantly improve the quality of high-entropy alloys manufactured by laser additive manufacturing.
Description
technical field [0001] The invention relates to the field of laser metal material processing, in particular to a method for improving the internal quality of high-entropy alloys manufactured by laser additive manufacturing. Background technique [0002] With the advancement of aerospace and nuclear technology, the demand for high-performance metal materials is becoming more and more urgent. High-entropy alloys, referred to as HEAs, are usually alloys composed of five or more elements in an equimolar or nearly equimolar ratio. HEAs not only have excellent high-temperature mechanical properties, but also have excellent strength, ductility and fracture toughness at low temperatures without brittle transition, and are regarded as hard coatings on high-temperature turbine blades, high-temperature molds, cutting tools and even the fourth generation Alternative materials for nuclear reactor components. Powder-fed laser additive manufacturing is one of the most potential advanced ...
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