UDIMET® Alloy 720 Product Introduction
UDIMET® alloy 720 is a high-strength nickel-based superalloy known for its excellent mechanical properties and resistance to high-temperature environments. This article provides a comprehensive introduction to UDIMET® alloy 720, 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.
Thành phần hóa học
UDIMET® alloy 720 is primarily composed of nickel with significant additions of cobalt, chromium, iron, and other elements to enhance its mechanical and thermal properties:
| Yếu tố | Thành phần (%) |
|---|---|
| Niken (Ni) | 59.0 – 63.0 |
| Coban (Co) | 17.0 – 21.0 |
| Crom (Cr) | 15,0 – 17,0 |
| Sắt (Fe) | 3,0 – 5,0 |
| Molypden (Mo) | 1,5 – 2,5 |
| Vonfram (W) | 0.5 – 1.5 |
| Nhôm (Al) | 0.5 – 1.5 |
| Titan (Ti) | 0.5 – 1.5 |
| Boron (B) | 0.003 – 0.01 |
| Cacbon (C) | 0tối đa 0,08 |
Tính chất cơ học
UDIMET® alloy 720 exhibits excellent mechanical properties suitable for high-temperature applications:
| Tài sản | Giá trị |
|---|---|
| Độ bền kéo, ksi (MPa) | 170 – 190 (1172 – 1310) |
| Cường độ năng suất (bù 0,2%), ksi (MPa) | 120 – 140 (827 – 965) |
| Độ giãn dài (% tính bằng 2 inch) | 15 – 20 |
| Độ cứng, Rockwell C (HRC) | 35 – 40 |
Đặc tính hiệu suất
UDIMET® alloy 720 offers several performance advantages:
- High-Temperature Strength: Retains excellent mechanical properties at elevated temperatures up to 1000°C (1832°F).
- Oxidation Resistance: Provides good resistance to oxidation and high-temperature corrosion in various environments.
- Creep Resistance: Exhibits high creep resistance, making it suitable for applications under constant stress at high temperatures.
Ứng dụng công nghiệp
UDIMET® alloy 720 is used in various industries requiring high performance under extreme conditions:
| Ngành công nghiệp | Các ứng dụng |
|---|---|
| Hàng không vũ trụ | Gas turbine components such as turbine blades, vanes, and discs. |
| Sản xuất điện | Gas and steam turbine components, combustion chambers, and heat exchangers. |
| Xử lý hóa học | Reactor vessels, heat exchangers, and pipes handling corrosive chemicals at high temperatures. |
Hình dạng và kích thước
UDIMET® alloy 720 is available in various forms and sizes to meet specific application requirements:
- Các hình thức: Sheets, plates, bars, forgings, and wire.
- Kích thước: Thickness ranging from 0.5 mm to 100 mm for plates, and diameter ranging from 1 mm to 300 mm for round bars.
Tiêu chuẩn sản xuất
UDIMET® alloy 720 conforms to international production standards ensuring quality and reliability:
| Mẫu sản phẩm | Hình dạng có sẵn | Kích cỡ có sẵn | Tiêu chuẩn sản xuất |
|---|---|---|---|
| Tấm/tấm | Tấm, tấm | Thickness: 0.5 mm – 100 mm | ASTM B637, AMS 5764 |
| Thanh/Thanh | Thanh tròn, thanh vuông | Đường kính: 1 mm – 300 mm | ASTM B637, AMS 5764 |
| rèn | Blocks, Discs, Rings | Size: Customized | ASTM B637, AMS 5764 |
Hàn và Gia công
UDIMET® alloy 720 offers good weldability and processing characteristics:
- Hàn: Can be welded using methods such as TIG, MIG, and resistance welding. Preheating and post-weld heat treatment may be required to maintain properties.
- Khả năng gia công: Generally machined in the solution-annealed condition using carbide tools and appropriate cutting fluids.
Ưu điểm và nhược điểm
| Diện mạo | Chi tiết |
|---|---|
| Thuận lợi | High strength and toughness at elevated temperatures, excellent oxidation resistance, good creep resistance, and availability in various forms and sizes. |
| Nhược điểm | Higher cost compared to standard nickel alloys, requires specialized processing and handling due to its high strength and alloying elements. |
So sánh với các hợp kim tương tự
UDIMET® alloy 720 (UNS N07200) is often compared with other high-strength nickel-based superalloys such as UDIMET® alloy 718 and UDIMET® alloy 625. Here’s a brief comparison:
| Loại hợp kim/Thuộc tính | Hợp kim UDIMET® 720 | UDIMET® alloy 718 | UDIMET® alloy 625 |
|---|---|---|---|
| Thành phần hóa học | High nickel, cobalt, chromium, with additional alloying elements for high-temperature strength. | High nickel, chromium, and niobium with smaller additions of aluminum and titanium. | High nickel, chromium, and molybdenum with niobium and tantalum for strength and corrosion resistance. |
| Tính chất cơ học | Higher tensile and yield strength, superior creep resistance at high temperatures. | Lower tensile and yield strength compared to UDIMET® alloy 720, good toughness and fatigue resistance. | Lower tensile and yield strength, excellent fatigue resistance, and good corrosion resistance in various environments. |
| Các ứng dụng | Gas turbines, aerospace components requiring high-temperature strength and oxidation resistance. | Aerospace components, high-temperature bolts, and fasteners. | Chemical processing equipment, marine applications, and aerospace components requiring corrosion resistance. |
This detailed article introduces UDIMET® alloy 720, 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 robust, high-strength superalloy for demanding applications in aerospace, power generation, and chemical processing industries will find UDIMET® alloy 720 suitable for use under extreme conditions.