Although the metal laser cutting machine has many performance advantages, it is not good for all materials, such as superalloys. It is not easy to use metal laser cutting machine to process superalloy. You will know what to ask in the process of operation.
1. The tendency of work hardening is large.
2. Poor thermal conductivity of materials. The unit cutting force of unreinforced superalloy is more than 4000N/mm2, while that of ordinary alloy steel is only 2500N/mm2. The strength of superalloy is more than 30% higher than that of alloy steel commonly used for steam turbines. At the cutting temperature of more than 600 ℃, the strength of nickel-based superalloy is still higher than that of ordinary alloy steel. The work hardening phenomenon has a great impact on the life of the oxidation tip tap, and usually causes severe boundary wear. A large amount of cutting heat generated when cutting superalloys is borne by the oxidation tip tap, and the tool tip bears a cutting temperature of up to 800~1000 ℃. Under the action of high temperature and large cutting force, the cutting edge will produce plastic deformation, adhesion and diffusion wear. For example, the hardness of GH4169 unreinforced matrix is about HRC37. After the metal laser cutting machine cuts, the surface will produce a hardened layer of about 0.03mm. The hardness will increase to about HRC47, and the hardening degree will be up to 27%.
3. Large cutting force. The strength of superalloy is more than 30% higher than that of alloy steel commonly used for steam turbines. At the cutting temperature of more than 600 ℃, the strength of nickel-based superalloy is still higher than that of ordinary alloy steel. The unit cutting force of unreinforced superalloy is more than 4000N/mm2, while that of ordinary alloy steel is only 2500N/mm2.
4. The main components of nickel-based alloy are nickel and chromium, and a small amount of other elements are also added: molybdenum, tantalum, niobium, tungsten, etc. It is worth noting that tantalum, niobium, tungsten, etc. are also the main components used to manufacture carbide (or high-speed steel) oxidation tip taps. Processing high-temperature alloy with these oxidation tip taps will cause diffusion wear and abrasive wear.
The above is the difficulty of cutting superalloy with metal laser cutting machine. I hope you can avoid processing superalloy in the future operation
