Choosing the suitable alloy is crucial for materials used in aerospace, military, and industrial applications. For high-stress and high-temperature applications, corrosion-resistant alloys like AMS 5676 come into play. This article will dive deep into AMS 5676, its composition, physical and mechanical properties, and common uses.
What is AMS 5676?
AMS 5676 is an aerospace industry standard specification for stainless steel alloy components. It features a high strength-to-weight ratio, superior corrosion resistance, and excellent fabrication characteristics that make it suitable for aircraft structures and other demanding applications.
AMS 5676 Composition
AMS 5676 is a type of precipitation-hardened nickel-based alloy. Its composition comprises nickel, chromium, titanium, and aluminium. The primary ingredient is nickel, which accounts for 40-50 per cent of the total composition. Chromium makes up 19-21 per cent of the alloy, while titanium and aluminium each account for 4-5 per cent.
AMS 5676 Physical Properties
AMS 5676 boasts exceptional physical properties, making it a preferred choice for demanding applications. The alloy has high-temperature resistance, with a melting point of up to 1315°C. Its density ranges from 8.19 – 8.24 g/cm3, and the thermal conductivity is 9.8 W/mK.
AMS 5676 Mechanical Properties
Mechanical properties refer to a material’s strength and toughness. AMS 5676 is a precipitation-hardened alloy, which develops its strength due to heat treatment. After solution and precipitation heat treatment, the alloy exhibits excellent strength, with a tensile strength of up to 1680 MPa and a yield strength of up to 1175 MPa. The alloy can withstand high-stress applications and maintain its properties at high temperatures.
AMS 5676 Uses
AMS 5676 is a versatile alloy used in various applications, including aerospace and military. It applies to fuel nozzles, guide vanes, and compressors for gas turbines. Additionally, AMS 5676 is used in chemical processing plants, nuclear power plants, and offshore oil drilling rigs. This alloy’s remarkable combination of properties makes it suitable for applications where corrosion, high-temperature, and high-stress conditions exist.
AMS 5676 Hardness
AMS 5676 has exceptional hardness, making it resistant to wear and tear. The hardness is measured using the Rockwell hardness scale, characterized by the hardness number followed by the scale’s letter. For AMS 5676, the hardness scale is measured using the Rockwell C scale. After heat treatment, the alloy’s hardness can reach up to Rc48.
AMS 5676 Heat Treatment
Heat treatment is required in the manufacture of AMS 5676. The alloy is precipitation-hardened, meaning the heat treatment process enhances its strength. The heat treatment starts with solution annealing, where the alloy is heated to around 1145°C. This process dissolves unwanted phases and relieves the internal stresses in the alloy. The alloy is then rapidly cooled in water to retain its strength.
AMS 5676 is an exceptional alloy with unique properties essential for applications in a range of high-stress applications. It boasts high-temperature resistance, remarkable strength, and hardness, making it ideal for aerospace, chemical processing plants, and offshore oil drilling rigs. The precipitation-hardening process enhances its strength and improves its wear resistance. AMS 5676 is preferred for manufacturers seeking alloys that can withstand high-temperature and high-stress environments.
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