Mechanical Properties of Martensitic Steel
Summary
Martensitic steel is distinguished by its exceptional combination of strength, hardness and wear resistance, arising from a diffusionless transformation of face-centred cubic austenite into a body-centred tetragonal martensite. This transformation produces a hierarchical microstructure of laths, blocks and packets within prior austenite grains, bounded by high-angle interfaces that impede dislocation motion. Carbon and alloying elements such as molybdenum and niobium refine prior austenite grain size, control carbide precipitation and tailor the hardness–toughness balance. Typical tensile strengths exceed 1.5 GPa, hardness can reach 60 HRC, and appropriate tempering can restore ductility and impact resistance. Retained austenite within the martensitic matrix may transform under applied stress, contributing to strain hardening and delaying crack propagation. Recent advances in three-dimensional characterisation and crystal-plasticity modelling have shed light on the role of dislocation substructures, auto-tempering effects and interfacial features in deformation and fracture processes. In dual-phase configurations, the morphology of martensite–ferrite interfaces and local strain partitioning dictate damage initiation, with substructure boundary sliding emerging as a key plastic mechanism. Precise control of quenching rates, tempering regimes and alloy chemistry enables optimisation of lath thickness, block size and carbide distribution, meeting demanding service requirements in automotive, energy and defence sectors worldwide.
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Mechanical Properties of Martensitic Steel publication trend
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Technical terms
Martensitic transformation: A rapid, diffusionless phase change that converts austenite into a body-centred martensite structure.
Lath martensite: A hierarchical assembly of plate-like martensite units organised into laths, blocks and packets.
Prior austenite grain: A high-temperature face-centred cubic region whose size governs martensitic substructure dimensions.
Habit plane: The specific crystallographic plane along which the martensitic interface advances during transformation.
Substructure boundary sliding: A plastic mechanism in which lath or packet boundaries shear under applied stress.
Retained austenite: Austenitic regions that persist after quenching and may transform under load to improve ductility.
References
- Property Optimization in As-Quenched Martensitic Steel by Molybdenum and Niobium Alloying. Metals (2018).
- Substructure and crystallography of lath martensite in as-quenched interstitial-free steel and low-carbon steel. Acta Materialia (2023).
- An integrated experimental-numerical study of martensite/ferrite interface damage initiation in dual-phase steels. Scripta Materialia (2024).
- Martensite plasticity and damage competition in dual-phase steel: A micromechanical experimental–numerical study. Acta Materialia (2023).
- Revisiting the martensite/ferrite interface damage initiation mechanism: The key role of substructure boundary sliding. Acta Materialia (2021).
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