AMS 5842/5841 Cobalt Alloy MP159

 

MP159 Material (UNS R30159) is a Nickel-Cobalt based multiphase alloy. Possessing the unique combination of ultra-high strength, ductility, and corrosion resistance. Through work strengthening and aging, MP159 exhibits ultimate tensile strength levels in excess of 265,000 psi while maintaining reduction of area values greater than 30%. Excellent strength and ductility are also evident at elevated temperatures up to 1100 - 1200 °F (593-649°C).

 

MP159 is used in many different industries from use in prosthetic devices, jet engine components, fasteners, marine applications to petroleum industry applications.

Lork Group offers Cobalt Alloy MP159 Material in a variety of forms, including:

Solution Heat Treat: 1900°F - 1925°F / 4-8 hours + Water Quench

Solution Heat Treat: 1900°F - 1925°F / 4-8 hours + Water Quench

Followed by work strengthened / strain hardening

Solution Heat Treat: 1900°F - 1925°F / 4-8 hours + Water Quench

Followed by work strengthened / strain hardening

Ffollowed by ageing: 1200-1250°F 4-4.5 hours + Air Cool.

Practices typically used for heat-treating stainless-steel and nickel-base superalloys can also be applied to Cobalt MP159. In order to get the desired mechanical properties, strict temperature control is recommended, aided by precisely monitored rate and soak times. The atmosphere where Cobalt MP159 is heat-treated should be neutral or slightly oxidizing, and very low in sulfur. Any foreign matter on the part that contains sulfur should also be cleaned prior to any heat treatment. Finally, to obtain the highest possible strength levels, cold work strengthening is required after each annealing process.

Cobalt MP159 is produced using the vacuum induction method, followed by VAC-ARC, and VIM-VAR remelting, which yields the best solidification results.

 

Thanks to its excellent flexibility, Cobalt MP159 can be cold-worked using all conventional methods to produce relatively complex parts. MP159 responds very well to aging. The phase transformation between cold-working and aging can also be used for strengthening the alloy up to 265,000 psi (1830 MPa).

 

The method to achieve that strength starts with cold-working for 45-50% reduction of area, followed by aging at 1225 °F (663 °C) for 4 hours and then air-cooled to room temperature. Additional work strengthening can be accomplished by extrusion, rolling, swaging, pilgering, and drawing, or a combination of any of those processes.