General Characteristics
Cobalt-based alloys, particularly CoCrMo, are extensively used in demanding applications due to their high stiffness, wear resistance, and ability to be highly polished. These alloys are ideal for medical prosthetic implants such as knee and hip joints, as well as dental prosthetics. In aerospace, cobalt alloys are used in gas turbines for components like fuel nozzles and vanes.

Arcam EBM System
The Arcam Electron Beam Melting (EBM) system offers a controlled vacuum environment that enhances material properties compared to traditional investment casting. The ASTM F75 CoCr alloy produced by Arcam exhibits high strength, corrosion resistance, and excellent wear resistance, making it suitable for orthopedic and dental implants.

Special Characteristics
The Arcam ASTM F75 CoCr alloy is also used for rapid manufacturing of production tools for injection molding. Its high hardness and excellent material qualities allow for polishing to mirror-like finishes, enhancing tool life and productivity.

Applications
Typical applications of CoCr include gas turbines, orthopedic implants, and dental implants.

Powder Specification
The Arcam ASTM F75 CoCr alloy powder is produced by gas atomization, with a particle size of 45–100 microns, ensuring safe handling. The chemical composition complies with ASTM F75 standards.

Post Processing
Heat Treatment: Recommended heat treatment includes hot isostatic pressing (HIP) and homogenization (HOM) to improve isotropy and reduce brittleness.
Machining: Parts manufactured using EBM demonstrate good machinability and can be polished to a superior surface finish.

Chemical Composition
The chemical composition of the Arcam ASTM F75 alloy includes chromium, molybdenum, nickel, iron, carbon, silicon, manganese, tungsten, phosphorus, sulfur, nitrogen, aluminum, titanium, boron, and cobalt, with specific percentages aligning with ASTM F75 requirements.

Mechanical Properties
Mechanical properties of the alloy include Rockwell hardness, tensile strength, yield strength, elongation at break, and fatigue limit, with specific values provided for as-built and heat-treated conditions.

Microstructure
EBM manufacturing results in fully dense parts without weld lines. The as-built material has elongated grains with carbide precipitation, which transforms into an isotropic structure with reduced carbides after HIP+HOM treatment, enhancing ductility and reducing hardness.