# Alloy 115 UNS N07001: Properties and Applications
## Introduction to Alloy 115 UNS N07001
Alloy 115, also known by its UNS designation N07001, is a high-performance nickel-based superalloy designed for extreme environments. This material offers exceptional strength, corrosion resistance, and thermal stability, making it a preferred choice for demanding applications in aerospace, power generation, and chemical processing industries.
## Chemical Composition
The unique properties of Alloy 115 stem from its carefully balanced chemical composition:
– Nickel (Ni): Primary base element (approximately 50%)
– Chromium (Cr): 18-20%
– Cobalt (Co): 15-17%
– Molybdenum (Mo): 3-5%
– Titanium (Ti): 2.5-3.5%
– Aluminum (Al): 1.5-2.5%
– Iron (Fe): ≤5%
– Carbon (C): ≤0.1%
This combination of elements creates a material with excellent mechanical properties and resistance to various forms of degradation.
## Mechanical Properties
Alloy 115 exhibits remarkable mechanical characteristics:
– Tensile Strength: 1200-1400 MPa (at room temperature)
– Yield Strength: 800-1000 MPa
– Elongation: 15-25%
– Hardness: 30-40 HRC
– Creep Resistance: Excellent performance at temperatures up to 815°C (1500°F)
These properties make it suitable for components subjected to high stress and elevated temperatures.
## Physical Properties
The physical characteristics of Alloy 115 include:
– Density: 8.2 g/cm³
– Melting Range: 1315-1370°C (2400-2500°F)
– Thermal Conductivity: 11.4 W/m·K (at 100°C)
– Electrical Resistivity: 1.25 μΩ·m
– Coefficient of Thermal Expansion: 13.5 μm/m·K (20-100°C)
## Corrosion Resistance
Alloy 115 demonstrates outstanding resistance to:
– Oxidation at high temperatures
– Sulfidation
– Carburization
– Chloride-induced stress corrosion cracking
– Acidic environments
This corrosion resistance makes it valuable in chemical processing and marine applications.
## Heat Treatment
Optimal performance of Alloy 115 is achieved through proper heat treatment:
– Solution Annealing: 1080-1120°C (1975-2050°F) followed by rapid cooling
– Aging Treatment: 700-800°C (1290-1470°F) for 8-16 hours
– Stress Relieving: 870-900°C (1600-1650°F) for 1-2 hours
## Fabrication and Machining
While Alloy 115 can be challenging to work with, proper techniques yield excellent results:
– Forming: Requires power tools and may need intermediate annealing
– Machining: Use rigid setups, sharp tools, and positive rake angles
– Welding: Gas tungsten arc welding (GTAW) is preferred with matching filler metal
– Grinding: Use silicon carbide or aluminum oxide wheels
## Applications
Alloy 115 finds use in numerous critical applications:
### Aerospace Industry
– Turbine blades and vanes
– Combustion chambers
– Afterburner components
– Exhaust systems
### Power Generation
– Gas turbine components
– Steam turbine blades
– Nuclear reactor parts
– Heat exchangers
### Chemical Processing
– Reactor vessels
Keyword: Alloy 115 UNS N07001
– Piping systems
– Valves and pumps
– Heat treatment fixtures
### Other Applications
– Marine propulsion systems
– Oil and gas equipment
– High-performance fasteners
– Medical implants (in some cases)
## Advantages Over Other Alloys
Alloy 115 offers several benefits compared to
