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AM350 is a precipitation-hardening stainless steel due to its high chromium and nickel content, featuring increased resistance to corrosion and oxidation compared to other stainless steels. This article reviews the mechanical properties of AM350 and its ability to resist stress at high temperature.
The composition of AM350 reveals that it is austenitic stainless steel, containing 17-19% chromium, 3-4% nickel and small amounts of manganese and molybdenum. The high resistance of AM350 to corrosion and oxidation is mainly attributed to its high chromium content, which forms a passive film on the material’s surface, thus preventing further oxidation. The nickel content provides further corrosion resistance and the molybdenum contributes to the overall mechanical properties of the steel.
The mechanical properties of AM350 are superior to those of other austenitic stainless steels. It has an Ultimate Tensile Strength (UTS) of 550 MPa, a Yield Strength (YS) of 370 MPa, an Elongation at Break of 35%, and an Impact Energy of 110 J. Additionally, it is highly ductile and displays excellent cold workability, making it suitable for a wide range of applications. It is often used in parts of machines and in the manufacturing process of aircrafts, cars and various other transportations, as it can resist wear, fatigue, and impact loads.
The suitability of AM350 for use in high temperature applications is mainly determined by its temperature dependent Young’s Modulus (YM) and Strength index (SI), which generally decrease with increasing temperature. At room temperature, AM350 displays a YM of 193GPa and an SI of 308MPa. At 850°C, the YM drops to 179 GPa, while the SI has decreased to 228 MPa. This indicates a decrease in the performance of the material at higher temperatures. However, these values are still high enough to be applicable to some high temperature applications.
The creep behaviour of AM350 is also relevant to high temperature applications. Creep is the tendency for a material to deform under a constant stress over time and can be used as a measure of the material’s ability to resist high temperatures. AM350 displays good creep resistance under laboratory tests. Its creep strength at 593°C and a stress of 145MPa is argued to be superior to other austenitic stainless steels such as AISI 316L.
In conclusion, the mechanical properties of AM350 make it suitable for many high temperature applications. Its superior tensile and yield strengths, excellent ductility and resistance to wear, fatigue and impact loads make it a suitable choice for components of machines. The temperture dependent Young’s Modulus and Strength Index of AM350 make it a good choice for operations where there is a higher operating temperature and a requirement of creep resistance.
