Additive manufacturing method of surface high-entropy alloying gradient metallurgy layer

Abstract

The invention discloses an additive manufacturing method of a surface high-entropy alloying gradient metallurgy layer, and belongs to the field of surface alloying. The additive manufacturing method comprises the following steps that step one, high-entropy alloying components are obtained through calculation based on a phase diagram; step two, an LMD technological strategy is designed, wherein anLMD technology is designed to carry out laser multilayer melting and sedimentation and increase the content of alloy powder in mixed powder layer by layer from the bottom up, and powder delivering schemes of different gradient coatings are formulated to design a multichannel and separable control powder delivering system; and step three, laser melting and sedimentation machining is carried out, thus the high-entropy alloying gradient metallurgy layer is obtained. The additive manufacturing method achieves the effects that the high-entropy alloying gradient layer excellent in properties is prepared on the surface of a cheap base material, the requirement that the surface properties of a formed part are outstanding is met, the production cost is lowered substantially, the bonding strength between the material surface metallurgy layer and a base is improved, and cracking of the metallurgy layer is inhibited effectively.

Description

technical field [0001] The invention belongs to the field of surface alloying, in particular to a method for preparing a surface high-entropy alloy gradient metallurgical layer. Background technique [0002] With the development of industry, the requirements for the surface properties of structural parts are getting higher and higher in the fields of aerospace, automobile, electronics and biology. Surface alloying can effectively improve the wear resistance, corrosion resistance, high temperature oxidation resistance and surface strength of metal materials. Traditional surface strengthening methods mainly include carburizing, nitriding, and metalizing. Although the above method is relatively mature and widely used, due to the cost and environmental problems caused by high heating temperature, long processing cycle and large energy consumption, especially the control of the composition of the alloy layer, it cannot meet the growing demands of the industry. need. Therefore,...

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Problems solved by technology

[0006] Aiming at defects such as poor interlayer metallurgical bonding, high production cost, cracks in the metallurgical layer, and poor plasticity and toughness existing in the prior art, the present invention invents a material-additive preparation method for a gradient metallurgical layer of a surface high-entropy alloy. The transition layer realizes the preparation of the gradient metallurgical layer, which can enhance the flexibility of the formed part and reduce the manufacturing cost. The high-entropy alloy layer on the surface can well meet the surface performance requirements of the formed part, and can improve the bonding strength between the metallurgical layer and the substrate , can effectively suppress the cracking problem of the metallurgical layer

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