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Alloy R41 UNS N07041: Properties and Applications

Alloy R41, also known by its UNS designation N07041, is a high-performance nickel-based superalloy renowned for its exceptional strength, corrosion resistance, and ability to withstand extreme temperatures. This alloy is widely used in aerospace, industrial gas turbines, and other demanding applications where reliability under stress is critical. In this article, we will explore the key properties, processing methods, and applications of Alloy R41.

Chemical Composition of Alloy R41

The outstanding performance of Alloy R41 stems from its carefully balanced chemical composition. The primary elements include:

• Nickel (Ni): 40-44% (base element)
• Chromium (Cr): 18-20% (provides oxidation resistance)
• Cobalt (Co): 10-12% (enhances high-temperature strength)
• Molybdenum (Mo): 9-10.5% (improves creep resistance)
• Aluminum (Al): 1.4-1.8% (forms strengthening precipitates)
• Titanium (Ti): 3.0-3.5% (works with Al to form gamma-prime phase)
• Iron (Fe): ≤ 5% (residual element)

Minor additions of boron, carbon, and zirconium further enhance the alloy’s mechanical properties and microstructural stability.

Key Properties of Alloy R41

Mechanical Properties

Alloy R41 exhibits remarkable mechanical properties across a wide temperature range:

• Tensile Strength: 1,380 MPa (200 ksi) at room temperature
• Yield Strength: 830 MPa (120 ksi) at room temperature
• Elongation: 20% in 50 mm (2 in.) at room temperature
• Creep Resistance: Excellent up to 980°C (1,800°F)
• Fatigue Strength: Superior under cyclic loading conditions

Physical Properties

The physical characteristics of Alloy R41 include:

• Density: 8.22 g/cm³ (0.297 lb/in³)
• Melting Range: 1,315-1,370°C (2,400-2,500°F)
• Thermal Expansion Coefficient: 12.6 μm/m·°C (20-100°C)
• Thermal Conductivity: 11.4 W/m·K (at 100°C)
• Electrical Resistivity: 1.25 μΩ·m

Corrosion Resistance

Alloy R41 demonstrates excellent resistance to:

• Oxidation at high temperatures
• Sulfidation in sulfur-containing environments
• Hot corrosion in salt-containing atmospheres</
  
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