Magnesium alloy additive repairing and remanufacturing method

Abstract

The invention provides a magnesium alloy additive repairing and remanufacturing method, and belongs to the technical field of magnesium alloy repairing and remanufacturing. The magnesium alloy additive repairing and remanufacturing method comprises the following steps that the damaged surface of a magnesium alloy part is treated; geometric parameters of a damaged area are measured, the damaged volume is determined, and an additive repairing technology is determined based on the damaged volume; laser-electric arc composite forming equipment is adopted for accurately repairing the damaged part subjected to mechanical polishing; the repaired damaged part is subjected to stress relief annealing; and finishing is carried out on the surface of the additive repair part. According to the method, grain coarsening in the magnesium alloy additive manufacturing process can be broken, no heat affected zone exists, grains of a forming layer are fine, defects such as air holes and cracks are avoided, and the mechanical property of the forming layer is obviously improved compared with a base body due to grain refinement.

Description

technical field [0001] The invention belongs to the technical field of magnesium alloy repair and remanufacture, and relates to a method for magnesium alloy repair and remanufacture with additive materials. Background technique [0002] Magnesium alloys have the advantages of low density, high specific strength and specific stiffness, good casting performance, easy machining, strong damping and shock absorption, impact resistance, easy recycling and rich resources. They are highly recognized by governments, scientific research institutions and business circles. Quantitative materials have been gradually applied to modern industries such as automobile manufacturing, aerospace, and rail transit. [0003] However, there are two "bottlenecks" in magnesium alloys: (1) the electrode potential of magnesium alloys is very low, and the oxide film on the surface is loose and not dense, which makes the parts of magnesium alloys prone to large-scale corrosion damage; (2) the hardness of...

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Problems solved by technology

[0005] In the method of additive repair and remanufacturing of magnesium alloy parts mentioned above, there are the following technical defects: the traditional surfacing and cladding process and the new laser forming technology are not ideal for repairing magnesium alloy parts, and the repaired parts cannot be repaired. Meet the service requirements, which is determined by the special physical and chemical properties of magnesium alloys

On the one hand, magnesium alloys have very strict requirements on remanufacturing and forming technology. Traditional surfacing or cladding methods have low heating efficiency, long heating time, and large heat input to the substrate, resulting in many defects and poor performance in the forming layer when repairing magnesium alloy parts. , is not suitable for the remanufacturing of magnesium alloy parts. At the same time, the requirements of modern production for remanufacturing are gradually tending to the direction of high function, high precision, high reliability and high efficiency. Traditional technology is far from meeting these requirements; on the other hand, Although the new laser heat source forming technology has outstanding advantages such as high power density, high degree of automation, little impact on the properties of the matrix structure, high repair accuracy and excellent repair area performance, the laser reflectivity of magnesium alloys is extremely high, resulting in low laser energy utilization. , Large energy loss, poor forming effect, and magnesium alloy has a low melting point, easy oxidation, and high dilution rate, so there are many restrictions on the selection of laser heat source repair materials

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