Mechanical Properties and Microstructural Effects in Nickel-Alloyed Steel
Summary
Nickel-alloyed steels, typically containing 3.5–9 wt % Ni, achieve a unique combination of high strength, toughness and ductility across ambient and cryogenic temperatures through the stabilising influence of nickel on the austenitic phase. By shifting transformation temperatures and refining phase distributions, nickel promotes retained austenite and refines martensitic lath structures, resulting in enhanced work-hardening, delayed brittle-to-ductile transitions and improved fatigue resistance. Precipitation of carbides or copper-rich phases during tempering further augments yield strength via precipitation strengthening, while careful control of tempering schedules governs the thermal stability of retained austenite and the coarsening of strengthening precipitates. Welded joints introduce microstructural heterogeneities in heat-affected zones, where local variations in grain size and phase content dictate notch toughness and fracture behaviour. These steels find widespread applications in liquefied natural gas storage, deepwater pipelines, cryogenic vessels and high-strength structural components, where reliable performance under extreme mechanical, thermal and environmental conditions is essential.
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Mechanical Properties and Microstructural Effects in Nickel-Alloyed Steel publication trend
The graph below shows the total number of articles in mechanical properties and microstructural effects in nickel-alloyed steel across all publications each year (not limited to Nature Index journals).
Technical terms
Austenite: Face-centred cubic iron phase stable at elevated temperatures, key to ductility and transformation behaviour.
Martensite: Supersaturated body-centred tetragonal phase formed by rapid cooling, conferring high hardness and strength.
Retained austenite: Austenite that remains untransformed after quenching, contributing to toughness via the TRIP effect.
Precipitation strengthening: Enhancement of strength through finely dispersed secondary particles that impede dislocation motion.
Fatigue crack growth rate (FCGR): Speed at which a crack propagates per loading cycle under cyclic stresses.
Crack tip opening displacement (CTOD): Measure of fracture toughness defined by the displacement at the crack tip under load.
Heat-affected zone (HAZ): Region of base metal adjacent to a weld whose microstructure and properties have been altered by welding heat.
References
- Microstructural characterisation and micromechanical investigation of the heat-affected zone in multi-pass welding of 9Ni steel pipes. Journal of Materials Research and Technology (2023).
- Thermal Stability of Retained Austenite and Properties of A Multi-Phase Low Alloy Steel. Metals (2018).
- Effect of Temperature on Microstructure and Mechanical Properties of Fe-9Ni-2Cu Steel during the Tempering Process. Materials (2021).
- Effect of Nickel Contents on Fatigue Crack Growth Rate and Fracture Toughness for Nickel Alloy Steels. Metals (2022).
- Retaining Mechanical Properties of GMA-Welded Joints of 9%Ni Steel Using Experimentally Produced Matching Ferritic Filler Metal. Materials (2022).
- Strength-Toughness Balance and Hydrogen Embrittlement Susceptibility of a Precipitation-Strengthened Steel Adopted Tempering Process. Metals (2022).
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