ASTM A891-1990 (1995 Confirmed) Forge Superalloy Iron Based Parts for Turbine Rotors and Wheels by Precipitation Hardening
The ASTM A891-1990 (1995 Confirmed) is a specification for designing, manufacturing and installing forge superalloy iron based parts for turbine rotors and wheels by precipitation hardening. It outlines the requirements for the material, design, production, assembly and testing of these parts. The ASTM A891-1990 (1995 Confirmed) is intended primarily to be used as the standard reference material for forging superalloy steel parts used in turbines and steam turbines.
The material that conforms to the standard is a forge superalloy iron based material designated as ASTM A891-1990 (1995 Confirmed). The material is composed of a nickel-base superalloy with a low carbon content. This material provides superior strength and hardness to standard steel, making it ideal for turbine parts. It is also resistant to creep and oxidation at elevated temperatures, making it a suitable material for high temperature applications.
The design requirements for parts that conform to the ASTM A891-1990 (1995 Confirmed) are outlined in detail. The design should incorporate a wide range of dimensional and form tolerances that allows for ease of manufacturing as well as reliable and repeatable operation of the parts. Proper corrosion protection must be provided to prevent premature failure due to corrosion. The design should also ensure that the parts have the required hardness and strength for their intended use.
In the production process, the ASTM A891-1990 (1995 Confirmed) outlined the procedures to be followed for forging and heat treating parts. This includes chemical composition checks, minimum total thickness and maximum material property requirements. Furthermore, it also prescribes required documentation and inspection steps that must be taken to ensure that the manufactured parts adhere to the standard.
During installation, every part must be inspected for signs of distress or damage. This can include visual inspection as well as nondestructive tests. The ASTM A891-1990 (1995 Confirmed) requires that a sample of parts be tested to verify their mechanical and physical properties. If the results of these tests do not meet the required specifications, then the parts must not be used.
Finally, the ASTM A891-1990 (1995 Confirmed) requires that the parts be tested and examined after installation. This is to ensure that the parts are operating in the specified environments according to the design requirements. If the parts fail to operate as expected, they must be replaced with new ones.
The ASTM A891-1990 (1995 Confirmed) is a comprehensive standard for designing, manufacturing, and installing forge superalloy iron based parts for turbine rotors and wheels by precipitation hardening. It outlines the necessary requirements for materials, design, production, assembly and testing of these parts. Above all, this standard ensures that the parts are reliable, safe and perform in accordance with their specific intended applications.
