Manufacturing and application methods for laser cladding powder of iron-base alloy

Abstract

The invention discloses a design manufacturing method and an application method for laser cladding powder. The design manufacturing method includes preparing Fe-Mn-Si memory alloy powder and putting the memory alloy powder into a ball grinder to process powder mixing. The application method includes processing a vacuum drying treatment before the cladding, presetting the cladding powder on base materials, and processing the cladding with laser which is 1.5-3 Kw in laser power, 400-1000 mm / min in scanning speed and 3 mm in laser diameter. By the stress of the laser cladding layer of the Fe-Mn-Si memory alloy, martensitic transformation and the martensitic deformation compatibility are induced so as to effectively remove the residual stress of the cladding layer and improve the fatigue strength of the cladding layer with no need of adding extra processing. The laser cladding powder of the iron-base alloy has the advantages of being simple in preparation technology, applicable to mass production, good in wear resistance, low in residual stress, high in fatigue strength, and the like.

Description

technical field [0001] The patent of the present invention relates to laser cladding technology, especially the manufacture and use method of an iron-based alloy laser cladding powder. Background technique [0002] Laser cladding refers to placing the selected coating material on the surface of the coated substrate through different feeding methods, and irradiating it with a high-energy-density laser beam to melt it simultaneously with the thin layer on the surface of the substrate and solidify rapidly to form a dilution rate. A surface coating that is extremely low and metallurgically bonded to the base material, thereby significantly improving the performance of the metal surface. At present, the laser cladding layer obtained by using the iron-based alloy cladding powder commonly used in industry can have high hardness and wear resistance. However, in the process of rapid melting and solidification, the cladding layer will produce residual tension due to thermal shrinkage....

AI Technical Summary

Problems solved by technology

At present, the laser cladding layer obtained by using the iron-based alloy cladding powder commonly used in industry can have high hardness and wear resistance. However, in the process of rapid melting and solidification, the cladding layer will produce residual tension due to thermal shrinkage. The tensile stress reduces the fatigue strength of the cladding layer, and even produces micro and macro cracks

At present, the main methods to reduce the residual stress of the cladding layer include reducing the temperature gradient, adding plasticizing and toughening elements to the cladding material, ultrasonic vibration, etc., but these methods require additional processes, which greatly increase the cost, and these methods Can not completely prevent the generation of cracks, lack of corresponding theoretical breakthroughs

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