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

Abstract

The invention provides a gradient alloy material and method for laser strengthening of a copper plate of a crystallizer of a continuous casting machine. The method comprises the following steps: enabling transition of a nickel-based alloy material and a substrate on the working surface of a narrow chromium zirconium copper plate of the crystallizer by a laser cladding technology; and then cladding a special cobalt-based alloy material on the nickel-based alloy transition layer to form a new gradient alloy layer on the working surface of the narrow chromium zirconium copper plate of the crystallizer, wherein the gradient alloy layer is resistant to high temperature corrosion and wear resistant and is of an ultrafine and high-toughness metallographic structure. The cobalt-based alloy material is the novel cobalt-based alloy material prepared from the cobalt-based alloy by adding Hf, B and Si elements on the basis of satellite, and then properly lowering down the melting point of the alloy. Compared with the prior art, the gradient alloy material and method have the beneficial effects that the resistance to high-temperature corrosion and the wear resistance of the working surface of the narrow plate of the crystallizer are improved, the laser repair and reproduction of a crystallizer out of work are realized, and the use performance of the crystallizer can also be recovered and improved; in addition, the problem due to the repair of a chromium zirconium copper crystallizer out of work can be effectively solved; the quality of a casting blank is improved; the casting cost of steel per ton can be decreased.

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