Nickel-based alloy powder material for repairing crystallizer foot roller and repairing method

Abstract

The invention discloses a nickel-based alloy powder material for repairing a crystallizer foot roller. The nickel-based alloy powder material comprises the following chemical components in percentage by mass of 22-28% of Cr, 8-12% of Mo, 3-4% of Nb, 1.0-2.5% of Si, 0.8-1.6% of B, 0.8-2% of V, 0.05-0.08% of C and the balance of Ni. The invention further discloses a repairing method of the crystallizer foot roller. The method comprises the following steps of 1, rough turning; 2, pre-flaw detection; 3, laser cladding, wherein a cladding layer comprises two layers, a base coat is iron-based alloy powder, a functional layer is cladded on the base coat, and the functional layer is made of nickel-based alloy powder; 4, finish turning; 5, grinding; and 6, post-flaw detection. The crystallizer foot roller repaired by using the material and the method provided by the invention has the advantages that the properties such as high-temperature oxidation resistance, cold and hot fatigue resistance and wear resistance are obviously improved, and the corresponding service life is also greatly prolonged.

Description

technical field [0001] The invention relates to the field of material surface modification, in particular to a nickel-based alloy powder material for repairing a crystallizer foot roll and a repair method. Background technique [0002] In the metallurgical industry, the mold is known as the "heart" of the continuous casting line, and the foot roll is an important transmission part at the lower end of the mold. When the slab passes through the foot rolls, it is not completely solidified, which causes the foot rolls to withstand very high temperatures. At the same time, in order to lower the temperature, cooling water is continuously sprayed onto the surface of the foot roll, so that the foot roll continuously experiences rapid heating and rapid cooling cycles. In addition, the working conditions of the foot rolls are extremely harsh, being corroded by acidic mold slag and rubbed by casting slabs. Therefore, the surface of the foot roll is prone to oxidative wear, corrosion,...

AI Technical Summary

Problems solved by technology

The disadvantages of surfacing welding are: the heat input of surfacing welding is large, and it is easy to produce large deformation, and the dilution rate is large, which requires multiple layers of surfacing welding to reduce the impact; at the same time, surfacing welding is prone to defects such as pores and inclusions; and surfacing welding Preheating before welding is required, coupled with large heat input, resulting in coarse grains and reduced mechanical properties

However, the existing nickel-based alloys cannot have both high-temperature oxidation resistance, cold and heat fatigue resistance and wear resistance, so there are still certain shortcomings as repair materials for foot rollers.

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