Laser strengthening process of piercing point

Abstract

The invention relates to a laser strengthening process of a piercing point. The laser strengthening process comprises the following steps of: smelting a transition alloy layer on the surface of a substrate of the piercing point; smelting a high-strength alloy layer on the transition alloy layer by laser, wherein alloy powder used by the transition alloy layer is an nickel-based alloy; and the alloy powder used by the high-strength alloy layer is a cobalt-based alloy. In the process, the hardness of the transition alloy layer is lower than that of the high-strength alloy layer, has the transition effect on the high-hardness and high-abrasion-resistance high-strength alloy layer, and can better remit an overlaying stress, so that a residual overlaying stress does not cause great influences on tissues of a laser smelting layer even if the point is not pre-heated and not annealed, so that the phenomenon that the performance of the smelting layer is influenced by annealing can be effectively avoided and the surface hardness and the abrasion resistance of the piercing point are greatly improved; and meanwhile, the pre-heating and annealing processes are saved and the production efficiency is improved.

Description

technical field [0001] The invention relates to a laser cladding method, in particular to a laser cladding method for the surface of a perforated plug. Background technique [0002] With the increase of my country's export of seamless steel pipes, the consumption of spare parts used in the production of seamless steel pipes is also increasing year by year. The perforated plug is a key tool for producing seamless steel pipes. The quality and service life of the perforated plug have a direct impact on the output, quality and production cost of seamless steel pipes. The temperature of the perforated plug is very high when it is working, and it bears a lot of combined stress. During use, it will fail such as deformation, collapse, sticking to steel, and cracking. In my country, more than one million perforated plugs are discarded every year due to failure, and this number is increasing at a rate of more than 15% year by year. If the surface of these failed or new perforated pl...

AI Technical Summary

Problems solved by technology

The laser cladding process of the perforated plug in the prior art must preheat the plug and anneal after the surfacing to eliminate stress. Not only the process is cumbersome, the production efficiency is slow, but also the hardness of the cladding layer is reduced. there are certain problems