Rare Earth Element Effects on Steel Microstructure and Properties
Summary
Rare earth elements (REEs) such as lanthanum, cerium and yttrium have emerged as potent microalloying additions in steel, altering phase transformations, refining microstructures and enhancing performance. By reacting strongly with oxygen and sulphur, REEs modify inclusions, leading to finer, more uniformly dispersed non-metallic particles that serve as heterogeneous nucleation sites during solidification. This results in refined grains, improved toughness and controlled precipitation of carbides and oxides. REE additions also influence phase stability, increasing retained austenite fractions and delaying undesirable transformations. Collectively, these effects yield steels with superior strength, ductility, fatigue resistance and corrosion performance. The global drive towards lighter, stronger and more durable structural materials has placed REE-treated steels at the forefront of advanced manufacturing, from high-speed rail to offshore platforms and additive-manufactured components.
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Rare Earth Element Effects on Steel Microstructure and Properties publication trend
The graph below shows the total number of articles in rare earth element effects on steel microstructure and properties across all publications each year (not limited to Nature Index journals).
Technical terms
Microstructure: The arrangement of phases and defects within a metal as revealed by optical or electron microscopy.
Grain refinement: Reduction of average crystallite size in metals, leading to enhanced strength and toughness.
Inclusions: Non-metallic particles (oxides, sulphides) within the steel matrix that can act as nucleation sites or stress concentrators.
Retained austenite: Austenitic (face-centred cubic) phase preserved at ambient temperature, contributing to toughness and ductility.
Microalloying: Addition of minute quantities of alloying elements to control phase transformations and refine microstructure.
References
- Revealing the Corrosion Resistance Mechanism of Plain Carbon Steel Micro-Alloyed by La in Simulated Industrial Atmosphere. Materials (2024).
- Effect of Rare Earth Elements on Microstructure and Tensile Behavior of Nb-Containing Microalloyed Steels. Materials (2024).
- Effect of Rare Earth Y on Microstructure and Mechanical Properties of High-Carbon Chromium Bearing Steel. Metals (2024).
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