Nickel-Based Single Crystal Casting Technology
Nickel-base single-crystal casting technology is an investment casting process to produce nickel superalloys without grain boundaries to improve high-temperature creep behavior. Selective crystallizers in the casting process ensure this.
Physical-Chemical Working Principle
Nickel-base single-crystal casting technology uses selection crystallizers to produce a single-crystal structure. This prevents the formation of grain boundaries and improves creep behavior at high temperatures.
Metallurgical Relevance & Risks in Welding
A single-crystal structure is very homogeneous and has low anisotropy. This leads to improved toughness and resistance, especially at high temperatures. However, welding such alloys can be more difficult because the crystal structure can be affected.
Workshop Practice & Instructions
Welding nickel-base single-crystal cast alloys requires high precision. Use, if necessary, special welding processes like TIG or plasma welding. Ensure uniform post-weld heat treatment to stabilize the crystal structure.