Laser strengthening alloying method for railway rail

Abstract

The invention discloses a railway track laser strengthening alloying method. On the basis of an existing steel rail, through the laser alloying process means, a micro melting bath is formed on the surface of a steel rail test piece, an alloy coating and the steel rail surface layer structure are subject to the metallurgical chemistry reaction, and a strengthening layer is formed on the surface layer of the steel rail. The strengthening layer has the pearlite microstructure obviously different from the original steel rail material, the structure shows white light through a microscope, through ahigh-power microscope, a particle strengthening structure and a solid solution strengthening structure distributed in a dispersion manner can be seen, the higher strength and higher toughness are achieved, and the comprehensive property is good. The strengthening layer structure and the steel rail base body structure are in firm metallurgical bonding, and jointly form a composite strengthening material structure, the whole high toughness, surface high strength and high wear resistance of the steel rail test piece can be achieved, and the severe condition between railway wheel rails can be effectively borne.

Description

technical field [0001] The invention relates to the field of railway rail strengthening, in particular to a laser strengthening alloying method for railway rails. Background technique [0002] Since the invention of the train in the 19th century, railway transportation has played an irreplaceable role in the advancement of human civilization. With the continuous progress of society, people's demand for railway transportation is also increasing, and people continue to increase the capacity and speed of trains. Therefore, the life of railway components is an important factor restricting railway transportation capacity. [0003] Railway rails are important components of railway lines. The basic rails of the line, the rails in the turnout area (turnout point rails, guard rails, frogs, wing rails, etc.), curved rails, etc., are severely worn under the extrusion and impact between the train wheels and rails. The wear and tear of the rails will lead to the failure of the rails. If...

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Problems solved by technology

[0006] However, the effect of such strengthening treatment is limited by the rail material itself, and at the same time, in order to ensure the impact toughness of the entire rail, the heat treatment hardness is often controlled during the heat treatment process, thereby sacrificing the strength and wear resistance of the rail

Generally, the surface hardness of the existing rail is only 30-40HRC, and the wear resistance and contact fatigue resistance are not good, and it is easy to cause wear and tear failure under the condition of train wheel rail extrusion

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