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.
Химический состав
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:
| Элемент | Состав (%) |
|---|---|
| Никель (Ni) | 59.0 – 63.0 |
| Кобальт (Со) | 17.0 – 21.0 |
| Хром (Cr) | 15,0 – 17,0 |
| Железо (Fe) | 3,0 – 5,0 |
| Молибден (Мо) | 1.5 – 2.5 |
| Вольфрам (Ж) | 0.5 – 1.5 |
| Алюминий (Al) | 0.5 – 1.5 |
| Титан (Ti) | 0.5 – 1.5 |
| Бор (Б) | 0.003 – 0.01 |
| Углерод (С) | 00,08 макс. |
Механические свойства
UDIMET® alloy 720 exhibits excellent mechanical properties suitable for high-temperature applications:
| Свойство | Ценить |
|---|---|
| Предел прочности, тыс.фунтов на квадратный дюйм (МПа) | 170 – 190 (1172 – 1310) |
| Предел текучести (смещение 0,2%), тыс.фунтов на квадратный дюйм (МПа) | 120 – 140 (827 – 965) |
| Удлинение (% на 2 дюйма) | 15 – 20 |
| Твердость, Роквелл C (HRC) | 35 – 40 |
Характеристики производительности
UDIMET® alloy 720 offers several performance advantages:
- Высокотемпературная прочность: Retains excellent mechanical properties at elevated temperatures up to 1000°C (1832°F).
- Устойчивость к окислению: 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.
Промышленные приложения
UDIMET® alloy 720 is used in various industries requiring high performance under extreme conditions:
| Промышленный сектор | Приложения |
|---|---|
| Аэрокосмическая промышленность | Gas turbine components such as turbine blades, vanes, and discs. |
| Выработка энергии | Gas and steam turbine components, combustion chambers, and heat exchangers. |
| Химическая обработка | Reactor vessels, heat exchangers, and pipes handling corrosive chemicals at high temperatures. |
Формы и размеры
UDIMET® alloy 720 is available in various forms and sizes to meet specific application requirements:
- Формы: Листы, пластины, прутки, поковки и проволока.
- Размеры: Толщина листов от 0,5 мм до 100 мм и диаметр круглых прутков от 1 мм до 300 мм.
Производственные стандарты
UDIMET® alloy 720 conforms to international production standards ensuring quality and reliability:
| Форма продукта | Доступные формы | Доступные размеры | Производственные стандарты |
|---|---|---|---|
| Плиты/листы | Листы, плиты | Толщина: 0,5 мм – 100 мм | ASTM B637, AMS 5764 |
| Бары/стержни | Круглые стержни, Квадратные стержни | Диаметр: 1 мм – 300 мм | ASTM B637, AMS 5764 |
| Поковки | Блоки, Диски, Кольца | Размер: Индивидуальный | ASTM B637, AMS 5764 |
Сварка и обработка
UDIMET® alloy 720 offers good weldability and processing characteristics:
- Сварка: Можно сваривать такими методами, как TIG, MIG и контактная сварка. Для сохранения свойств могут потребоваться предварительный нагрев и термообработка после сварки.
- Обрабатываемость: Обычно обрабатывается в отожженном состоянии с использованием твердосплавных инструментов и соответствующих смазочно-охлаждающих жидкостей.
Преимущества и недостатки
| Аспект | Подробности |
|---|---|
| Преимущества | High strength and toughness at elevated temperatures, excellent oxidation resistance, good creep resistance, and availability in various forms and sizes. |
| Недостатки | Higher cost compared to standard nickel alloys, requires specialized processing and handling due to its high strength and alloying elements. |
Сравнение с аналогичными сплавами
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:
| Тип/свойство сплава | УДИМЕТ® сплав 720 | UDIMET® alloy 718 | UDIMET® alloy 625 |
|---|---|---|---|
| Химический состав | 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. |
| Механические свойства | 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. |
| Приложения | 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.