Waspalloy

General Characteristics of Waspalloy

Waspaloy provides stress-rupture and tensile strength to 1400°F (760°C) and resists oxidation to 1600°F (871°C). This vacuum-inducting melted nickel alloy is ideally suited for high-heat applications, including gas turbine engines and airframe and missile components.

Chemical Composition of Waspalloy

  • Carbon 0.10 max
  • Manganese 0.75 max
  • Silicon 0.75 max
  • Sulfur 0.030 max
  • Iron 2.0 max
  • Copper 0.50 max
  • Cobalt 12.00-15.00
  • Molybdenum 3.50-5.00
  • Titanium 2.60-3.25
  • Aluminum 1.00-1.60
  • Zirconium 0.02-0.12
  • Boron 0.003-0.010
  • Chromium 18.00-21.00
  • Nickel balance

Heat Treatment of Waspalloy

  • Maximum room and raised temperature tensile characteristics
    • Hold at 1825°F (996°C) for 4 hours
    • After oil quench, reheat to 1550°F (843°C)
    • Air cool
    • Hold at 1400°F (760°C) for 16 hours
    • Air cool to Rockwell C32-38
  • High-temperature stress rupture and creep characteristics
    • Hold at 1975°F (1079°C) for 4 hours
    • Air cool to Rockwell C20-25
    • Hold at 1550°F (843°C) for 24 hours
    • Air cool
    • Hold at 1400°F (760°C)  for 16 hours
    • Air cool to Rockwell C32-38

Applications of Waspalloy

  • Jet and missile industry components, including:
    • Engine turbine buckets and discs
    • High-heat fasteners and bolts
    • Air frame assemblies

Machinability of Waspalloy

  • Heat treatment and fabrication presents challenges
  • Machine after solution treating and partial aging to Rockwell C30
  • Solution treatment and Rockwell C20 for drilling and tapping
  • High-speed steel turning tools
  • Shock-resistant carbide-tipped tools for fully age-hardened material

Workability of Waspalloy

  • Easily worked at high temperatures
  • 2150° to 1850°F (1177° to 1010°C)
  • Neutral or slightly oxidizing furnace atmosphere
  • Cold form in thin sections
  • Tendency to work harden
  • Harder to fabricate cold than stainless steel 300

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