The processing process of nickel-based alloys is a comprehensive process involving several key links to ensure that the material meets stringent performance requirements such as high temperature, high strength, and corrosion resistance.

I. Melting and refining

Melting is the first step of processing. Nickel, chromium, molybdenum and other elements need to be mixed proportionally and heated to the melting state to form a uniform alloy liquid. To improve purity, vacuum induction melting, electric sludge remelting or Vacuum self-consumption smelting and other processes, effectively remove impurities and gases. For example, Nickel270 alloy is prepared by powder metallurgy technology of high purity nickel substrate, and then cast molding.

II. Casting and molding

Casting melt alloy liquid poured into the mold solidification molding, common methods include sand casting, pressure casting, etc. Nickel-based casting alloy needs to control the casting temperature at 1450–1580 ℃, and use ceramic filter to purify the melt Body to reduce defects. For complex components, it can also be processed into sheet, bar or tube by cold rolling, cold drawing, etc.

Three, heat treatment

Heat treatment is the core of optimizing performance, mainly including:

Solid solution treatment: dissolve impurities at 1000-1150 ℃ high temperature, uniformly organized, improve corrosion resistance.

Age-saving treatment: insulation at 650-900 ℃, promote γ′ phase separation, reinforce the material.

Annealing: used to eliminate cold processing stress and restore extensibility.

4. Mechanical processing

Nickel-based alloys have high hardness and poor thermal conductivity, making cutting tools extremely demanding. Special tools are required and cutting parameters are controlled to avoid overheating. After processing, they can be enhanced by electrolytic polishing or chemical nickel plating. Surface cleanliness and corrosion resistance.

Typical Applications

Nickel-based alloys are widely used in aerospace (such as engine turbines), energy (nuclear power reactors) and chemical equipment, and their processing process needs to be adjusted according to the specific service environment.