Alloy 115 UNS N07001: Properties and Applications

# 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 combines excellent mechanical properties with outstanding resistance to oxidation and corrosion, making it a preferred choice for demanding applications in aerospace, power generation, and chemical processing industries.

## Chemical Composition

The chemical composition of Alloy 115 UNS N07001 plays a crucial role in its exceptional properties:

– Nickel (Ni): 50-55%
– Chromium (Cr): 18-21%
– Cobalt (Co): 15-21%
– Molybdenum (Mo): 3-5%
– Aluminum (Al): 1.2-1.6%
– Titanium (Ti): 2.5-3.3%
– Iron (Fe): ≤5%
– Carbon (C): ≤0.12%
– Boron (B): ≤0.015%
– Zirconium (Zr): ≤0.07%

## Mechanical Properties

Alloy 115 exhibits remarkable mechanical characteristics that make it suitable for high-stress applications:

– Tensile Strength: 1400-1600 MPa (203-232 ksi) at room temperature
– Yield Strength: 1000-1200 MPa (145-174 ksi)
– Elongation: 10-15% in 50 mm (2 inches)
– Hardness: 35-45 HRC
– Creep Resistance: Excellent performance at temperatures up to 980°C (1800°F)

## Physical Properties

The physical characteristics of Alloy 115 contribute to its performance in various environments:

– Density: 8.2 g/cm³ (0.296 lb/in³)
– Melting Range: 1330-1380°C (2426-2516°F)
– Thermal Expansion Coefficient: 13.5 μm/m·°C (20-1000°C)
– Thermal Conductivity: 11.4 W/m·K at 100°C
– Electrical Resistivity: 1.25 μΩ·m at 20°C

## Heat Treatment

Proper heat treatment is essential to achieve optimal properties in Alloy 115:

– Solution Annealing: 1080-1120°C (1976-2048°F) followed by rapid cooling
– Aging Treatment: 760-800°C (1400-1472°F) for 16 hours, air cool
– Stress Relieving: 870-900°C (1600-1650°F) for 2 hours

## Corrosion Resistance

Alloy 115 offers excellent resistance to various corrosive environments:

– Oxidation resistance up to 1100°C (2012°F)
– Resistance to sulfidation and carburization
– Good performance in reducing and oxidizing acids
– Excellent resistance to stress corrosion cracking

## Applications of Alloy 115 UNS N07001

The unique combination of properties makes Alloy 115 suitable for numerous demanding applications:

### Aerospace Industry

– Turbine blades and vanes
– Combustion chambers
– Afterburner components
– Exhaust systems

### Power Generation

– Gas turbine components
– Nuclear reactor parts
– Heat exchangers
– Steam turbine blades

### Chemical Processing

– Reactor vessels
– Heat exchanger tubing
– Piping systems
– Catalyst support grids

### Other Applications

– Oil and gas equipment
– Medical implants
– High-temperature fasteners
– Rocket engine components

## Fabrication and Machining

Working with Alloy 115 requires special considerations:

– Machining: Requires rigid setups, sharp tools, and slow speeds
– Welding: Can be welded using TIG or MIG processes with matching