Haynes 188 is a type of high-temperature, nickel-based superalloy that is known for its exceptional strength, toughness, and resistance to both heat and corrosion. It was developed by Haynes International Inc., an American company that specializes in the production of high-performance alloys for use in a wide range of industries, including aerospace, chemical processing, and power generation.
In this article, we will take a closer look at Haynes 188, exploring its chemical composition, mechanical properties, standards, and applications.
Chemical Composition:
Haynes 188 is primarily composed of nickel (approximately 50%), chromium (approximately 22%), and cobalt (approximately 14%). It also contains significant amounts of tungsten (approximately 14%), molybdenum (approximately 3%), aluminum (approximately 0.5%), and titanium (approximately 0.4%).
In addition to these primary elements, Haynes 188 may also contain trace amounts of other elements such as carbon, silicon, sulfur, phosphorus, iron, and copper. These impurities can affect the alloy’s mechanical properties, so it is important to carefully control their levels during the manufacturing process.
Mechanical Properties:
Haynes 188 is known for its exceptional mechanical properties, particularly at high temperatures. Its high strength, toughness, and ductility make it an ideal material for use in applications where extreme conditions are present.
The following table outlines some of Haynes 188′s key mechanical properties:
| Property | Value |
|---|---|
| Tensile Strength | 135 ksi (931 MPa) |
| Yield Strength | 60 ksi (414 MPa) |
| Elongation | 40% |
| Hardness (HRC) | 35-45 |
| Density | 0.330 lb/in³ |
These values are for the annealed condition, which is the most common state for Haynes 188. However, the alloy can be heat-treated to achieve even higher levels of strength and hardness.
Standards:
Haynes 188 meets a number of industry standards, including ASTM B637 (Bar and Forging), AMS 5772 (Wire), and AMS 5801 (Plate, Sheet, and Strip). These standards ensure that the alloy meets certain requirements for chemical composition, mechanical properties, and other critical factors.
Applications:
Haynes 188 is used in a wide range of applications, particularly those that require high strength and resistance to heat and corrosion. Some of its primary applications include:
Aerospace: Haynes 188 is commonly used in aerospace applications, such as turbine blades and hot sections of jet engines. Its high temperature strength and resistance to creep make it an ideal material for these high-stress environments.
Chemical Processing: The high corrosion resistance of Haynes 188 makes it an excellent material for use in chemical processing equipment, such as reactors and heat exchangers. It is particularly well-suited to applications where highly corrosive materials and high temperatures are present.
Power Generation: Haynes 188 is also used in power generation applications, such as gas turbines and steam turbines. Its high temperature strength and excellent resistance to oxidation and thermal fatigue make it an ideal material for these high-temperature environments.
Conclusion:
Haynes 188 is a high-performance superalloy that offers exceptional strength, toughness, and resistance to heat and corrosion. Its unique combination of properties makes it an ideal material for use in a wide range of applications, from aerospace to chemical processing to power generation. If you are looking for a high-performance material that can withstand extreme conditions, consider Haynes 188.
Post time: May-27-2023
