Alloy powder for laser cladding of crystallizer copper plate and laser cladding method

Abstract

The invention relates to an alloy powder for laser cladding of a crystallizer copper plate and a laser cladding method, belonging to the technical field of material science and surface engineering. The alloy powder is calculated by weight percentage, and the mass composition of the alloy powder is: Mo: 2.1%~2.4%, Cr: 4.5%~4.7%, C: 1.5%~1.6%, Si: 0.12%~0.18%, W: 10.0% ~11.0%, V: 4.52%~4.72%, Mn: 3.22%~3.35%, and the balance is Fe. The preparation method of the present invention can clad the alloy powder on the surface of the copper plate under relatively low temperature conditions, and the thermal conductivity of the copper plate is good, so that the heat of the first alloy powder cladding layer is quickly taken away by the cooling water in the water tank, and the temperature of the cladding layer When it falls down quickly, the nearby copper plate does not melt, does not affect the fluidity of the alloy powder, improves the surface quality of the cladding layer, and the cladding layer has a dense structure and a smooth surface.

Description

technical field [0001] The invention relates to an alloy powder for laser cladding of a crystallizer copper plate and a laser cladding method, belonging to the technical field of material science and surface engineering. Background technique [0002] The crystallizer is a key component in the continuous casting equipment of the steel plant. The quality of the copper plate of the mold directly affects the surface quality of the continuous casting slab, the operation rate of the continuous casting machine and the continuous casting cost. Mold copper plate has problems such as edge wear, wide surface thermal crack, narrow surface shrinkage and corrosion during use. At present, the strengthening of the copper plate of the crystallizer is mainly to use a suitable surface treatment technology to plate one or several materials on the surface of the copper plate to obtain a special functional surface. Under the condition that its thermal conductivity is not greatly affected by the p...

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Problems solved by technology

The electroplating and thermal spraying coatings are mainly mechanically bonded to the substrate, so the coating is prone to fall off during use, resulting in a short service life, while the laser cladding layer is metallurgically bonded to the substrate surface. This year, this technology is more and more quickly applied to the crystallizer In the strengthening and repairing of copper plates, but in practical applications, it is found that due to the low melting point of copper, the alloy powder near the melting channel often reacts with the locally melted copper plate on the nearby surface. The surface of the first melted copper plate reacts together, resulting in poor fluidity of the molten pool powder, which in turn leads to defects such as pores and inclusions in the cladding layer, and makes the copper plate of the crystallizer after strengthening and repairing scrapped