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High-strength and high-toughness CoCrMoW alloy based on laser additive manufacturing and preparation method of high-strength and high-toughness CoCrMoW alloy

A high-toughness cobalt-chromium-molybdenum and laser additive technology, which is applied in the direction of additive manufacturing, additive processing, and process efficiency improvement, can solve problems affecting the application of alloys, reduce stress concentration points, and reduce coarse, brittle, and hard. Phase, the effect of improving the yield strength

Inactive Publication Date: 2020-05-19
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This seriously affects the application of the alloy in the biomedical field

Method used

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  • High-strength and high-toughness CoCrMoW alloy based on laser additive manufacturing and preparation method of high-strength and high-toughness CoCrMoW alloy

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Effect test

Embodiment 1

[0036] High-strength and high-toughness cobalt-chromium-molybdenum-tungsten alloy based on laser additive manufacturing, in terms of weight percentage, cobalt-chromium-molybdenum-tungsten alloy includes the following components:

[0037] Cr: 23-25%, Mo: 4-6%, W: 4-6%, Si: 0.5-1.5%, Mn: 0.4-0.6%, and the rest is Co.

[0038] The preparation method of the above-mentioned cobalt-chromium-molybdenum-tungsten bioalloy comprises the following steps:

[0039] 1) Gas atomization powder making: Accurately weigh according to the required formula ratio, mix the raw materials obtained by weighing and add them to a vacuum intermediate frequency induction furnace to smelt into a melt; use 1-6MPa high-pressure nitrogen to melt the melt Broken into fine droplets, solidified and cooled to obtain 20-65μm powder.

[0040] 2) Additive manufacturing molding: use software to build the model of the blank, slice and layer, and then import the data into the laser additive manufacturing equipment. Sp...

Embodiment 2

[0044] This embodiment is based on embodiment 1, and the difference with embodiment 1 is:

[0045] The molding blank obtained in step 2) is only subjected to strengthening and toughening heat treatment, and no plasticizing and toughening heat treatment is performed.

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Abstract

The invention discloses a high-strength and high-toughness CoCrMoW alloy based on laser additive manufacturing and a preparation method of the high-strength and high-toughness CoCrMoW alloy. The preparation method comprises the following steps of (1) gas atomization powder preparing, wherein after CoCr alloy raw materials are molten together into melt, the melt is crushed by high-pressure inert gas into tiny liquid drops, and powder is formed after solidification and cooling; (2) blank additive manufacturing forming, wherein the powder is prepared into a formed blank through the laser additivemanufacturing technology; (3) strengthening and toughening heat treatment, wherein the formed blank is subjected to strengthening and toughening heat treatment to obtain the high-strength and high-toughness CoCrMoW alloy based on laser additive manufacturing, the yield strength of the alloy reaches up to 0.9 GPa or above, the tensile strength of the alloy reaches up to 1.2 GPa or above, and the ductility of the alloy reaches up to 14% or above; and (4) plastifying and toughening heat treatment, wherein the high-strength and high-toughness CoCrMoW biological alloy obtained in the step (3) canbe subjected to subsequent plastifying and toughening heat treatment, the plasticity of the high-strength and high-toughness CoCrMoW biological alloy based on laser additive manufacturing can be further improved, and the plasticity of the high-strength and high-toughness CoCrMoW biological alloy based on laser additive manufacturing can reach 26% or above on the premise of guaranteeing that the tensile strength is 1.1 GPa or above.

Description

technical field [0001] The invention relates to the field of cobalt-chromium-molybdenum-tungsten bioalloy preparation, in particular to a high-strength and high-toughness cobalt-chromium-molybdenum-tungsten alloy based on laser additive manufacturing and a preparation method thereof. Background technique [0002] Cobalt-chromium-molybdenum-tungsten bioalloys are widely used in surgical implants, cardiovascular stents and dental implants due to their excellent mechanical properties, outstanding biocompatibility, good corrosion resistance, excellent ceramic performance and wear resistance. Implants, etc. Among them, chromium is mainly used to improve the corrosion resistance of the alloy. Molybdenum strengthens the alloy and further improves the biocompatibility of the material. Tungsten can not only improve the strength of the material, but also effectively improve the metal-ceramic bonding strength of the material. However, a large amount of alloying elements will cause t...

Claims

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Application Information

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IPC IPC(8): C22C19/07C22C1/04C22F1/10B22F3/105B22F9/08B33Y10/00B33Y70/00
CPCC22C19/07C22C1/0433C22F1/10B22F9/082B33Y10/00B33Y70/00B22F10/00B22F10/36B22F10/28B22F10/64Y02P10/25
Inventor 黄崇湘魏维王艳飞
Owner SICHUAN UNIV
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