UDIMET® Alloy R41 (UNS N07041) Product Introduction
UDIMET® alloy R41, designated as UNS N07041, is a high-temperature nickel-based superalloy known for its exceptional strength and corrosion resistance in extreme environments. This article provides a comprehensive introduction to UDIMET® alloy R41, covering its chemical composition, mechanical properties, performance at different temperatures, industry applications, shapes and sizes, production standards, welding and processing capabilities, advantages and disadvantages, and a comparison with similar alloys.
Chemical Composition
UDIMET® alloy R41 is primarily composed of nickel with significant additions of cobalt, chromium, tungsten, and molybdenum to enhance its mechanical and thermal properties:
| Element | Composition (%) |
|---|---|
| Nickel (Ni) | 50.0 – 60.0 |
| Cobalt (Co) | 14.0 – 17.0 |
| Chromium (Cr) | 15.0 – 18.0 |
| Tungsten (W) | 3.0 – 5.0 |
| Molybdenum (Mo) | 2.5 – 4.0 |
| Iron (Fe) | 3.0 – 5.0 |
| Titanium (Ti) | 1.5 – 2.5 |
| Aluminum (Al) | 0.1 – 0.5 |
| Boron (B) | 0.005 – 0.05 |
| Carbon (C) | 0.05 max |
Mechanical Properties
UDIMET® alloy R41 exhibits excellent mechanical properties suitable for high-temperature applications:
| Property | Value |
|---|---|
| Tensile Strength, ksi (MPa) | 150 – 180 (1034 – 1241) |
| Yield Strength (0.2% offset), ksi (MPa) | 110 – 140 (758 – 965) |
| Elongation (% in 2 inches) | 20 – 25 |
| Hardness, Rockwell C (HRC) | 35 – 40 |
Performance Characteristics
UDIMET® alloy R41 offers several performance advantages:
- High-Temperature Strength: Maintains excellent mechanical properties at temperatures up to 1000°C (1832°F), suitable for use in gas turbines and other high-temperature applications.
- Oxidation Resistance: Provides superior resistance to oxidation and corrosion in high-temperature and aggressive environments.
- Creep Resistance: Exhibits high creep resistance, making it ideal for components under constant stress at elevated temperatures.
Industry Applications
UDIMET® alloy R41 is utilized in various demanding industries where high performance under extreme conditions is required:
| Industry Sector | Applications |
|---|---|
| Aerospace | Gas turbine components including blades, discs, and seals. |
| Power Generation | Turbine blades, combustion chambers, and heat exchangers. |
| Chemical Processing | Reactor vessels, pipelines, and valves for handling corrosive chemicals at high temperatures. |
Shapes and Sizes
UDIMET® alloy R41 is available in various forms and sizes to meet specific application needs:
- Forms: Sheets, plates, bars, forgings, and wire.
- Sizes: Thickness ranging from 0.5 mm to 100 mm for plates, and diameter ranging from 1 mm to 300 mm for round bars.
Production Standards
UDIMET® alloy R41 conforms to international production standards ensuring quality and reliability:
| Product Form | Shapes Available | Sizes Available | Production Standards |
|---|---|---|---|
| Plates/Sheets | Sheets, Plates | Thickness: 0.5 mm – 100 mm | ASTM B637, AMS 5764 |
| Bars/Rods | Round bars, Square bars | Diameter: 1 mm – 300 mm | ASTM B637, AMS 5764 |
| Forgings | Blocks, Discs, Rings | Size: Customized | ASTM B637, AMS 5764 |
Welding and Processing
UDIMET® alloy R41 offers good weldability and processing characteristics:
- Welding: Can be welded using methods such as TIG, MIG, and resistance welding. Preheating and post-weld heat treatment may be required to maintain properties.
- Machinability: Generally machined in the solution-annealed condition using carbide tools and appropriate cutting fluids.
Advantages and Disadvantages
| Aspect | Details |
|---|---|
| Advantages | Exceptional high-temperature strength and oxidation resistance, good creep resistance, and wide availability in various forms and sizes. |
| Disadvantages | Higher cost compared to standard nickel alloys, requires specialized processing and handling due to its high strength and alloying elements. |
Comparison with Similar Alloys
UDIMET® alloy R41 (UNS N07041) is often compared with other high-temperature nickel-based superalloys such as UDIMET® alloy 718 and UDIMET® alloy 720. Here’s a brief comparison:
| Alloy Type/Property | UDIMET® alloy R41 | UDIMET® alloy 718 | UDIMET® alloy 720 |
|---|---|---|---|
| Chemical Composition | High nickel, cobalt, chromium, tungsten, molybdenum for high-temperature strength. | High nickel, chromium, and niobium with smaller additions of aluminum and titanium. | High nickel, cobalt, chromium, tungsten, molybdenum for high-temperature strength. |
| Mechanical Properties | Higher tensile and yield strength, superior creep resistance at high temperatures. | Lower tensile and yield strength compared to UDIMET® alloy R41, good toughness and fatigue resistance. | Higher tensile and yield strength compared to UDIMET® alloy 718, excellent oxidation resistance. |
| Applications | Gas turbines, aerospace components requiring high-temperature strength and oxidation resistance. | Aerospace components, high-temperature bolts, and fasteners. | Gas turbines, aerospace components requiring high-temperature strength and oxidation resistance. |
This detailed article introduces UDIMET® alloy R41 (UNS N07041), highlighting its chemical composition, mechanical properties, performance characteristics, industry applications, available forms and sizes, production standards, welding and processing capabilities, as well as advantages, disadvantages, and a comparison with similar alloys. Engineers and professionals seeking a high-strength, high-temperature superalloy for critical applications in aerospace, power generation, and chemical processing will find UDIMET® alloy R41 well-suited for use under extreme conditions.