Mechanical Properties of Austenitic Stainless Steels at Cryogenic Temperatures

Austenitic stainless steels, typified by high nickel and chromium content, maintain an austenitic face-centred cubic structure down to cryogenic temperatures, offering a unique combination of strength, toughness and corrosion resistance. As temperature decreases below –100 °C, yield and ultimate tensile strengths typically rise markedly owing to reduced dislocation mobility and increased work hardening. At the same time, ductility may be preserved or moderately reduced, depending on alloy composition and processing history. A key microstructural mechanism is strain-induced martensitic transformation, in which deformation at low temperature triggers the formation of hard martensite plates within the austenite matrix, enhancing strength and energy absorption. Deformation twinning and dislocation slip remain active modes, governed in part by stacking fault energy, which decreases at cryogenic temperatures and shifts the balance towards twinning and transformation-induced plasticity. Fracture toughness generally improves at low temperature, with reduced propensity for cleavage due to the inherent toughness of the austenitic phase and the crack-arresting effect of fine martensitic features. Practical applications of these properties span liquefied natural gas storage and transport, superconducting magnet supports, aerospace cryogenic fuel tanks and components in liquefaction plants. Recent advances focus on alloy design, thermo-mechanical processing and surface treatments to tailor transformation behaviour, minimise embrittlement and optimise energy absorption under dynamic loading at subzero temperatures.

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Mechanical Properties of Austenitic Stainless Steels at Cryogenic Temperatures publication trend

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Technical terms

Austenitic stainless steel: A category of stainless steels with a face-centred cubic crystal structure at room and lower temperatures, noted for high toughness and corrosion resistance.

Cryogenic temperature: Temperatures at or below –150 °C, where material behaviour can differ markedly from ambient conditions due to suppressed thermal activation of dislocation motion.

Martensitic transformation: A diffusionless phase change in which the metastable austenite lattice transforms to a body-centred tetragonal martensite under stress or low temperature, increasing hardness and strength.

Stacking fault energy: The energy penalty per unit area for creating a fault in the close-packed atomic layers of a metal; lower values promote twinning and transformation-induced plasticity.

Toughness: The capacity of a material to absorb energy and deform plastically before fracturing, often measured by impact energy tests.

References

1. Investigation of Microstructure and Mechanical Properties of Austenite Stainless Steel 304 during Tempering and Cryogenic Heat Treatment. E3S Web of Conferences (2020).
2. An analysis comparing the mechanical properties of ASS 316L at high and low temperatures. MATEC Web of Conferences (2024).
3. Investigation of Impact Behavior of STS304L Steel Plate Under Cryogenic Temperature. Applied Sciences (2025).