Heat treatment method and forming method of beryllium-free high-strength copper alloy part
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A heat treatment method, copper alloy technology, applied in the direction of additive manufacturing, additive processing, etc., can solve the problem of low yield strength and achieve the effects of high yield of fine powder, low oxygen content, and uniform chemical composition
Active Publication Date: 2021-06-08
安德伦(重庆)材料科技有限公司
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Another option as copper beryllium alloy is aluminum bronze, an existing aluminum bronze has a nominal composition (wt.%) of 18Al, 14Mn, 3Fe, 2Ni, and the rest is Cu (ZCuAl18Mn14Fe3Ni2), and its yield strength is lower than 420MPa
The nominal composition (wt.%) of an existing aluminum brass is 25Zn, 6Al, 3Fe, 3Mn, and the rest is Cu (ZCuAl6Fe3Mn3), and its yield strength is limited within 450MPa
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Embodiment 1
[0051] 1. This embodiment provides a beryllium-free high-strength copper alloy, the composition of which is specifically: 24% Ni, 5% Sn, 2% Al, 1% Co, 0.5% Nb, 0.05% Ti, 0.75% V, 0.005% B, the balance is Cu.
[0052] 2, the copper alloy preparation process of the present embodiment is as follows:
[0053] Weigh the alloy element raw materials according to the above chemical composition ratio, put them into the melting crucible of the vacuum induction melting powder making furnace for vacuum melting, and obtain the copper alloy melt; use the infrared thermometer to measure the temperature of the melt, and heat the copper alloy liquid After reaching 1200-1300°C, heat-preserve and refine for 20-40 minutes; then fill the vacuum induction smelting powder-making furnace with 99.999% high-purity argon gas. The nozzle is impacted by the high-pressure and high-speed argon gas flow and broken into fine droplets, which are spheroidized while cooling and solidifying, and finally form sph...
Embodiment 2
[0068] 1. This embodiment provides a beryllium-free high-strength copper alloy, which is specifically composed by mass percentage: 20% Ni, 7% Sn, 1.5% Al, 0.5% Co, 0.2% Nb, 0.05% Ti, 0.6% V , 0.005% B, the balance is Cu.
[0069] 2, the copper alloy preparation process of the present embodiment is as follows:
[0070] Weigh the alloy element raw materials according to the above chemical composition ratio, put them into the melting crucible of the vacuum induction melting powder making furnace for vacuum melting, and obtain the copper alloy melt; use the infrared thermometer to measure the temperature of the melt, and heat the molten steel to 1200~1300℃, heat preservation and refining for 20~40min; then fill the vacuum induction smelting powder making furnace with 99.999% high-purity argon. It is crushed into fine droplets by the impact of high-pressure and high-speed argon gas flow, and spheroidizes while cooling and solidifying, and finally forms spherical metal powder.
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Abstract
The invention discloses a heat treatment method and a forming method of a beryllium-free high-strength copper alloy part. The heat treatment method comprises vacuum solid solution heat treatment and two-stage aging treatment, wherein the solid solution treatment comprises the steps of, putting the part into a vacuum heat treatment furnace, and carrying out heat preservation treatment for 60-120 min at the heat preservation temperature of 850-900 DEG C; the primary aging treatment comprises the steps of, putting the part into the vacuum heat treatment furnace, and carrying out heat preservation treatment for 30-60 minutes at the heat preservation temperature of 600-800 DEG C; and the secondary aging treatment comprises the steps of, putting the part into the vacuum heat treatment furnace, and carrying out heat preservation treatment for 8-17 hours at the heat preservation temperature of 460-550 DEG C. According to the forming method, the part is formed through the selective laser melting additive manufacturing technology. Through the designed heat treatment method, the structure characteristics of the copper alloy forming part are improved again, the yield strength of a material is greatly improved, and the tensile strength, hardness and other performance of the material are improved; and by means of the design of the forming method, the components of the whole formed part can be more uniform, and macrosegregation does not exist.
Description
technical field [0001] The invention belongs to the technical field of heat treatment of new metal materials for additive manufacturing, and more specifically relates to a heat treatment method and a forming method of beryllium-free high-strength copper alloy parts. Background technique [0002] Copper-beryllium alloy is a high-strength and high-conductivity copper-based alloy. Its yield strength can reach more than 960MPa, and its tensile strength can reach more than 1400MPa. It also has high hardness, wear resistance, corrosion resistance, low temperature resistance, fast heat dissipation, and non-magnetic properties. , high electrical conductivity, impact and no sparks and other comprehensive properties; widely used in aerospace bushings, bearing bushes, die-casting molds, mold inserts and other fields. But because metal beryllium (Be) is poisonous, and 1~2wt.% Be element is added in this kind of copper alloy, therefore can damage people's health during processing and use...
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