Difficulties in processing high temperature alloys
Since superalloy is a material with high hardness and high temperature resistance, it is difficult to ensure the cutting accuracy when cutting with a fiber laser cutting machine. Compared with ordinary steel, what are the difficulties in processing superalloys with fiber laser cutting machines?
Poor thermal conductivity of superalloys: When cutting superalloys, there is a lot of heat at the oxidized end, and the cutting end is subjected to high temperature cutting of up to 600-800 °C. Under the action of high temperature and laser cutting, the cutting end will be deformed and become sticky. The knot and diffusion wear will affect the processing quality of the workpiece; the machined surface is easy to harden: for example, the basic hardness of GH4169 superalloy before hardening treatment is about HRC37, while fiber laser The hardened layer produced on the surface of the cutting machine is about 0.03mm. The hardness increases to about HRC47, and the hardness increases to 27.%. Machining-induced case hardening has a significant effect on the life of the oxide end, often resulting in severe boundary wear.
High cutting force requirements: the strength of superalloy is more than 30% higher than that of commonly used alloy steel materials. Under high temperature cutting above 600℃, the strength of nickel-based superalloy is still higher than that of ordinary alloy steel and non-reinforced superalloy. It is difficult for fiber laser cutting machine to cut superalloy under the condition of more than unit cutting force, which is also a technical problem to be solved urgently. It is believed that this problem will be effectively solved in the near future and promote the development of the entire laser cutting machine industry.
