Alloy powder for manufacturing embossed label plate by laser cladding

Abstract

The invention discloses alloy powder for manufacturing an embossed label plate for laser cladding, which is used for manufacturing a label plate on a locomotive vehicle. The alloy powder comprises the following chemical compositions in percentage by weight: 18 to 30 percent of Ni, 11 to 28 percent of Cr, 0.8 to 2.2 percent of Si, 0.4 to 1.0 percent of B, less than or equal to 0.1 percent of Mn, less than or equal to 0.50 percent of Cu, less than or equal to 0.05 percent of P and the balance of Fe and unavoidable impurities. Tests show that a crack is not generated at the metallurgical joint of a cladding layer made of the alloy powder and a substrate; the atmospheric corrosion resistance of the alloy powder is higher than that of the conventional substrate of locomotive vehicle body, and the alloy powder can well meet the requirement of the locomotive vehicle on corrosion prevention performance when the locomotive vehicle runs in atmospheric environment; the alloy powder also has highwettability and self-fluxing performance, so that clad characters are attractive and flat; and the design cost of a formula of the alloy powder is low.

Description

technical field [0001] The invention relates to a laser cladding material, in particular to an alloy powder used for laser cladding to make a raised signboard, which is used for making a signboard on a railway vehicle. Background technique [0002] At present, most of the signs of railway vehicles are made of stainless steel plates. The process is to first engrave the characters, and then spot weld the signs to the middle beam of the car body. The lettering production damaged the surface of the stainless steel plate, and the fonts were sunken and unsightly. At the same time, the spot-welded signs are easy to corrode and fall off during the operation of the vehicle, and are not permanent. [0003] With the advancement of signage technology, there have been permanent embossed signs on the market by cladding alloy powder on the surface of products by laser. This kind of alloy powder is commonly used with Fe-based, Co-based and Ni-based metal powders. The Fe-based powder is m...

AI Technical Summary

Problems solved by technology

The Fe-based powder is mainly composed of Fe elements, and a small amount of Cr, Ni, B, Si and other alloy elements are added at the same time. Its corrosion resistance is poor, and it cannot meet the requirements of long-term operation of railway vehicles in atmospheric erosion environments.

Co-based powders and Ni-based powders are mainly alloying elements Co and Ni respectively. Although they have good corrosion resistance, they are expensive, and these two types of metal powders have high hardness and large thermal expansion coefficients. Poor wettability, large residual stress after laser cladding, prone to cracks, and unable to meet the requirements of fatigue and dynamic load operation of railway vehicles

Therefore, railway researchers have been trying to develop a laser cladding alloy powder for signs suitable for railway vehicle materials and operating environments, but so far have not achieved good results

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