Iron-based alloy powder for high strength and toughness laser deposited coating

Abstract

The invention discloses iron-based alloy powder for a high strength and toughness laser deposited coating in the technical field of alloy materials. The iron-based alloy powder comprises the following components: 0.60 to 1.00 percent of C, 0.35 to 0.70 percent of Si, 0.30 to 0.60 percent of Mn, 5.00 to 7.00 percent of Cr, 2.50 to 4.00 percent of Ni, 1.50 to 2.50 percent of Mo, 1.00 to 1.50 percent of W, 0.70 to 1.00 percent of V, 0.20 to 0.40 percent of Ti, 0.50 to 0.70 percent of B, 0.20 to 0.40 percent of Nb, 0.10 to 0.30 percent of Ce and the balance of Fe. The iron-based laser deposited alloy coating without cracks in large area can be obtained without pre-heating and post thermal treatment, the deposited alloy coating has high hardness which reaches 62 to 67HRC, and the yield strength reaches 1,700 to 2,000MPa.

Description

technical field [0001] The invention relates to a powder in the technical field of alloy materials, in particular to an iron-based alloy powder for high-strength toughness laser cladding coating. Background technique [0002] In the field of surface engineering technology, traditional surface engineering technologies such as submerged arc surfacing and thermal spraying have been difficult to restore and improve the performance of waste parts similar to cold rolls with high load and certain impact resistance and toughness. Compared with submerged arc surfacing, thermal spraying and other technologies, laser cladding technology is a new type of surface treatment technology. Laser cladding layer has super solid solution strengthening, dislocation strengthening, fine grain strengthening, particle strengthening and other effects, making it have High surface hardness, so that the deposited alloy has high wear resistance and fatigue resistance under high-speed, high-load friction a...

AI Technical Summary

Problems solved by technology

Too high carbon content (>1%) will significantly reduce the toughness and plasticity of the coating, while too low carbon content (<0.25%) will make the coating fail to meet high hardness requirements

[0004] After searching the prior art, it was found that Chinese Patent Document No. CN 1737197A (Crack Control Method of Laser Cladding Formed Metal Parts) reported a method of improving cladding forming structure through ultrasonic vibration, reducing residual tensile stress, reducing and eliminating The invention of the crack, but this method is cumbersome

Chinese Patent Document No. CN 101381869A (special alloy powder for laser cladding of high-hardness crackless iron-based alloys) reports an invention. Although the cladding layer can reduce crack sensitivity, due to the low carbon content (0.4%) and alloy powder Element content (10%), it is difficult to generate dispersed particle reinforcement phase, the hardness value of the clad layer is below 63HRC, and the tensile strength is 1300MPa, it is difficult to meet the high hardness (63-70HRC) required by cold rolling rolls. There are still difficulties in surface strengthening of parts under high load and wear conditions

At present, the market lacks a special iron-based alloy powder for laser surface cladding with high hardness, high toughness, and low cost for mechanical parts such as cold rolls that are applied under high-load and wear conditions, so as to realize such parts laser cladding repair