Gradient alloy material and method for laser strengthening of continuous casting machine crystallizer copper plate

Abstract

A gradient alloy material and method for laser strengthening of copper plate of continuous casting machine crystallizer, using laser cladding technology on the working surface of chromium-zirconium copper narrow plate of crystallizer, first transitioning between nickel-based alloy material and base material, and then nickel-based alloy material The special cobalt-based alloy material is clad on the alloy transition layer, so that the working surface of the chromium-zirconium-copper narrow plate of the crystallizer forms a new high-temperature corrosion-resistant and wear-resistant gradient alloy layer with ultra-fine, high-strength and toughness metallographic structure. The cobalt-based alloy is based on a Stellite alloy, and by adding Hf, B and Si elements, the melting point of the alloy is appropriately lowered to form a new cobalt-based alloy material suitable for laser cladding. Compared with the existing technology, the beneficial effect of the present invention is: by improving the high temperature corrosion and wear resistance of the working surface of the narrow plate of the crystallizer, the laser repair and remanufacturing of the invalid crystallizer can be realized, and the use function can be restored and improved. It effectively solves the problem of repairing the invalid chromium-zirconium-copper crystallizer, improves the quality of the billet, and reduces the casting cost per ton of steel.

Description

technical field [0001] The invention relates to the field of metal materials, in particular to a gradient alloy material and method for laser strengthening of a copper plate of a continuous casting machine crystallizer. Background technique [0002] The crystallizer is a key part of the continuous casting machine, and its quality directly affects the surface quality of the continuous casting slab, the operation rate of the continuous casting machine and the cost of the continuous casting slab. The development of high-efficiency continuous casting technology has put forward higher requirements for the quality of the mold. High strength, high wear resistance, corrosion resistance and good thermal conductivity have become important indicators to measure the quality of the mold. During the use of the slab crystallizer, there are mainly problems such as edge wear, thermal cracks on the wide side, shrinkage on the narrow side, and corrosion. The copper crystallizer base material ...

AI Technical Summary

Problems solved by technology

[0004] However, although the widely used surface treatment methods such as electroplating, chemical plating, and thermal spraying can improve the wear resistance of the mold copper plate, because the prepared coating is mechanically bonded to the substrate rather than metallurgically physically bonded, during the use of the mold Often due to cold and heat fatigue, the coating is prone to peeling and peeling, causing the mold copper plate to be scrapped and continuous casting to stop production; the coating has defects such as looseness, pinholes, impurities, etc., which significantly affect the high temperature resistance, wear resistance and erosion resistance of the coating. , which affects the service life of the coating; and the production cycle is long and the production cost is high, which directly affects the production cost and consumption of the steel mill. In addition, electroplating, chemical plating, thermal spraying and other technologies have pollution and waste discharge problems, which are likely to cause environmental pollution