超耐热合金加工困难

Difficulties superalloys machining
Difficulties superalloys machining, metal is a relatively difficult to cut material because of its hardness is relatively large, it is prone to error when cutting difficult to ensure cutting accuracy, so here we should be based on laser cutting machine processing methods and methods to select metal laser cutting machine, sheet metal processing then how do? We will provide a detailed analysis of all technical engineer. Compared with the general steel, high temperature alloy machining difficulties mainly in the following four areas:
1. cutting power. Superalloy turbine strength than steel materials often used more than 30% higher, at more than 600 ℃ cutting temperature, strength of the Ni-base superalloy materials still higher than ordinary steel materials. Not enhanced processing unit superalloy cutting force in 4000N / mm2 or more, while the ordinary steel only 2500N / mm2.
2. The main ingredients of nickel-based alloy of nickel and chromium, with further addition of small amounts of other elements: molybdenum, tantalum, niobium, tungsten, etc., it is worth noting that, tantalum, niobium, tungsten carbide is used to manufacture (or high-speed steel), the main component of oxidized tip tap, tip tap processing these oxide high-temperature alloys will produce diffusion wear and abrasive wear.
3. The hardening tendency of large. For example GH4169 unreinforced matrix hardness treatment about HRC37, the surface after metal laser cutting machine will produce about 0.03mm hardened layer hardness to around HRC47, hardening up to 27%. Hardening phenomenon has a great influence on the oxidation tip tap life, often have serious boundary wear.
4. The material of poor thermal conductivity. A lot of cutting heat produced when cutting superalloys borne by the oxidation of tip tap, suffered a cutting tip temperatures up to 800 ~ 1000 ℃, and at high temperatures and high cutting forces, will lead to plastic deformation of the cutting edge, adhesion and diffusion wear .